I want to learn how to handle the image and gesture function in android.
So I read the sample "InteractiveChart" under "Animating a Scroll Gesture" section in Android developer website.
While I read about "onDoubleTap" method in InteractiveLineGraphView.java.
#Override
public boolean onDoubleTap(MotionEvent e) {
mZoomer.forceFinished(true);
if (hitTest(e.getX(), e.getY(), mZoomFocalPoint)) {
mZoomer.startZoom(ZOOM_AMOUNT);
}
ViewCompat.postInvalidateOnAnimation(InteractiveLineGraphView.this);
return true;
}
I checked the code of Zoomer.
It mainly calls DecelerateInterpolator method and set some variables.
I wonder how can "Zoomer" achieve the double tap zoom function.
Does "DecelerateInterpolator" do the work? Or I just missed something?
public class Zoomer {
/**
* The interpolator, used for making zooms animate 'naturally.'
*/
private Interpolator mInterpolator;
/**
* The total animation duration for a zoom.
*/
private int mAnimationDurationMillis;
/**
* Whether or not the current zoom has finished.
*/
private boolean mFinished = true;
/**
* The current zoom value; computed by {#link #computeZoom()}.
*/
private float mCurrentZoom;
/**
* The time the zoom started, computed using {#link android.os.SystemClock#elapsedRealtime()}.
*/
private long mStartRTC;
/**
* The destination zoom factor.
*/
private float mEndZoom;
public Zoomer(Context context) {
mInterpolator = new DecelerateInterpolator();
mAnimationDurationMillis = context.getResources().getInteger(
android.R.integer.config_shortAnimTime);
}
/**
* Forces the zoom finished state to the given value. Unlike {#link #abortAnimation()}, the
* current zoom value isn't set to the ending value.
*
* #see android.widget.Scroller#forceFinished(boolean)
*/
public void forceFinished(boolean finished) {
mFinished = finished;
}
/**
* Aborts the animation, setting the current zoom value to the ending value.
*
* #see android.widget.Scroller#abortAnimation()
*/
public void abortAnimation() {
mFinished = true;
mCurrentZoom = mEndZoom;
}
/**
* Starts a zoom from 1.0 to (1.0 + endZoom). That is, to zoom from 100% to 125%, endZoom should
* by 0.25f.
*
* #see android.widget.Scroller#startScroll(int, int, int, int)
*/
public void startZoom(float endZoom) {
mStartRTC = SystemClock.elapsedRealtime();
mEndZoom = endZoom;
mFinished = false;
mCurrentZoom = 1f;
}
/**
* Computes the current zoom level, returning true if the zoom is still active and false if the
* zoom has finished.
*
* #see android.widget.Scroller#computeScrollOffset()
*/
public boolean computeZoom() {
if (mFinished) {
return false;
}
long tRTC = SystemClock.elapsedRealtime() - mStartRTC;
if (tRTC >= mAnimationDurationMillis) {
mFinished = true;
mCurrentZoom = mEndZoom;
return false;
}
float t = tRTC * 1f / mAnimationDurationMillis;
mCurrentZoom = mEndZoom * mInterpolator.getInterpolation(t);
return true;
}
/**
* Returns the current zoom level.
*
* #see android.widget.Scroller#getCurrX()
*/
public float getCurrZoom() {
return mCurrentZoom;
}
}
Can someone also recommend some great sample about image and gesture handling? From basic to advanced.....Thanks a lot.
The double tap is actually done in InteractiveLineGraphView view itself
#Override
public boolean onDoubleTap(MotionEvent e) {
mZoomer.forceFinished(true);
if (hitTest(e.getX(), e.getY(), mZoomFocalPoint)) {
mZoomer.startZoom(ZOOM_AMOUNT);
}
ViewCompat.postInvalidateOnAnimation(InteractiveLineGraphView.this);
return true;
}
Zoomer is just a helper class holding current zoom level
I want to display the score when the quiz game is over.
I make it in two classes.
My code for the score is:
public class Helper {
/**
* This method selects a end game response based on the players score
/**
* Method to return an image to use for the end of game screen
*
* #param numCorrect - number of correct answers
* #param numRounds - number of rounds
*/
public static int getResult(int numCorrect, int numRounds){
//calculate percentage
int percentage = calculatePercentage(numCorrect, numRounds);
return percentage;
}
/**
* Calculate the percentage result based on the number correct and number of questions
*
* #param numCorrect - number of questions right
* #param numRounds - total number of questions
* #return int percentage correct
*/
private static int calculatePercentage(int numCorrect, int numRounds) {
int percentage = numCorrect/numRounds*100;
return percentage;
}
}
and
public class ResultPretest1 extends Activity implements OnClickListener{
TextView txtNilai;
Button tutorial;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result_pretest1);
GamePlay currentGame = ((BenkyouApplication)getApplication()).getCurrentGame();
int nilai = Helper.getResult(currentGame.getRight(), currentGame.getNumRounds());
txtNilai = (TextView)findViewById(R.id.nilai);
txtNilai.setText(String.valueOf(nilai));
tutorial = (Button) findViewById(R.id.tutorial);
tutorial.setOnClickListener(this);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.result, menu);
return true;
}
/*private static int calculatePercentage(final int numCorrect, final int numRounds) {
int score = 0;
score = numCorrect/numRounds*100;
return score;
}*/
#Override
public void onClick(View v) {
switch (v.getId()){
case R.id.tutorial :
tutorial.setBackgroundResource(R.drawable.tutorial1);
Intent tulv1 = new Intent(this, TutorialLevel1.class);
startActivity(tulv1);
break;
}
}
/* (non-Javadoc)
* #see android.app.Activity#onKeyDown(int, android.view.KeyEvent)
*
* This method is to override the back button on the phone
* to prevent users from navigating back in to the quiz
*/
#Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
switch (keyCode)
{
case KeyEvent.KEYCODE_BACK :
return true;
}
return super.onKeyDown(keyCode, event);
}
}
But displayed score is always 0. The score did not increase when the answer is right
please help me....
It might have to do with the way you're handling your scores in your Helper. Integer division truncates decimals, so when you have
int percentage = numCorrect/numRounds*100;
Then it will always return 0 unless they got 100% correct. Try using double or float instead of int.
try multiply first as follows:
int percentage = (100*numCorrect)/numRounds;
I want to display the score when the quiz game is over.
I make it in two classes.
My code for the score is:
public class Helper {
/**
* This method selects a end game response based on the players score
* #param numCorrect - number of correct answers
* #param numRounds - number of rounds
*/
public static int getResult(int numCorrect, int numRounds){
//calculate percentage
int hasil = calculatePercentage(numCorrect, numRounds);
return hasil;
}
/**
* Calculate the percentage result based on the number correct and number of questions
*
* #param numCorrect - number of questions right
* #param numRounds - total number of questions
* #return int percentage correct
*/
private static int calculatePercentage(int numCorrect, int numRounds) {
double result = (double)numCorrect/(double)numRounds;
int percentage = (int) result*100;
return percentage;
}
}
and
public class ResultPretest1 extends Activity implements OnClickListener{
TextView txtNilai;
Button tutorial;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result_pretest1);
GamePlay currentGame = ((BenkyouApplication)getApplication()).getCurrentGame();
int nilai = Helper.getResult(currentGame.getRight(), currentGame.getNumRounds());
txtNilai = (TextView)findViewById(R.id.nilai);
txtNilai.setText(String.valueOf(nilai));
tutorial = (Button) findViewById(R.id.tutorial);
tutorial.setOnClickListener(this);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.result, menu);
return true;
}
/*private static int calculatePercentage(final int numCorrect, final int numRounds) {
int score = 0;
score = numCorrect/numRounds*100;
return score;
}*/
#Override
public void onClick(View v) {
switch (v.getId()){
case R.id.tutorial :
tutorial.setBackgroundResource(R.drawable.tutorial1);
Intent tulv1 = new Intent(this, TutorialLevel1.class);
startActivity(tulv1);
break;
}
}
/* (non-Javadoc)
* #see android.app.Activity#onKeyDown(int, android.view.KeyEvent)
*
* This method is to override the back button on the phone
* to prevent users from navigating back in to the quiz
*/
#Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
switch (keyCode)
{
case KeyEvent.KEYCODE_BACK :
return true;
}
return super.onKeyDown(keyCode, event);
}
}
If you managed to answer everything correctly score a 100, but if there are wrong answers score is always displayed 0. score is not reduced if the answer is wrong and always be 0. Why? Please help....
try this:
double result = (((double)numCorrect)/numRounds)*100;
int percentage = (int) result;
return percentage;
Before posting this question I've searched a lot but could not find any clear answers on this issue.
I have to override default text selection of android webview & show my custom text selection dialog options. I have tried this sample code project.
This sample project works on following devices & emulator :
Acer Iconia a500 tablet : 10 inch : Android OS - 3.0
Acer Iconia a500 tablet : 10 inch : Android OS - 3.2
Samsung Galaxy Tab : 10 inch : Android OS - 4.0
Samsung Galaxy Tab : 7 inch : Android OS - 4.0
Emulator : Skin-WVGA800 : Android OS - 4.1.2
Not working on following devices :
Samsung Galaxy Tab : 10 inch : Android OS - 4.1.2
Samsung Galaxy Tab : 7 inch : Android OS - 4.1.2
On android os version 4.1 & 4.1+ instead of showing my custom text selection option dialog, it shows android system's default action bar for text selection.
I have searched a lot on this, many suggested to use onLongClick() method of the interface
I have already asked a question on this forum please see this link, with answers to this questions I am able to clone onLongClick() event but I can't stop default text selection action bar.
For this scenario I have few questions.
1.Why onLongClick() method stops working for device running on android os version 4.1+ ?
2.How to stop default text selection action bar on long pressing on the text from webview ?
This is my custom webview class.
package com.epubreader.ebook;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.content.Context;
import android.graphics.Rect;
import android.graphics.Region;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.ContextMenu;
import android.view.Display;
import android.view.GestureDetector;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnLongClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.webkit.WebView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;
import com.epubreader.R;
import com.epubreader.drag.DragController;
import com.epubreader.drag.DragLayer;
import com.epubreader.drag.DragListener;
import com.epubreader.drag.DragSource;
import com.epubreader.drag.MyAbsoluteLayout;
import com.epubreader.menu.menuAnimationHelper;
import com.epubreader.textselection.WebTextSelectionJSInterface;
import com.epubreader.textselectionoverlay.ActionItem;
import com.epubreader.textselectionoverlay.QuickAction;
import com.epubreader.textselectionoverlay.QuickAction.OnDismissListener;
public class CustomWebView extends WebView implements WebTextSelectionJSInterface,
OnTouchListener , OnLongClickListener, OnDismissListener, DragListener{
/** The logging tag. */
private static final String TAG = "CustomWebView";
/** Context. */
protected Context ctx;
/** The context menu. */
private QuickAction mContextMenu;
/** The drag layer for selection. */
private DragLayer mSelectionDragLayer;
/** The drag controller for selection. */
private DragController mDragController;
/** The start selection handle. */
private ImageView mStartSelectionHandle;
/** the end selection handle. */
private ImageView mEndSelectionHandle;
/** The selection bounds. */
private Rect mSelectionBounds = null;
/** The previously selected region. */
protected Region lastSelectedRegion = null;
/** The selected range. */
protected String selectedRange = "";
/** The selected text. */
protected String selectedText = "";
/** Javascript interface for catching text selection. */
/** Selection mode flag. */
protected boolean inSelectionMode = false;
/** Flag to stop from showing context menu twice. */
protected boolean contextMenuVisible = false;
/** The current content width. */
protected int contentWidth = 0;
/** Identifier for the selection start handle. */
private final int SELECTION_START_HANDLE = 0;
/** Identifier for the selection end handle. */
private final int SELECTION_END_HANDLE = 1;
/** Last touched selection handle. */
private int mLastTouchedSelectionHandle = -1;
/** Variables for Left & Right Menu ***/
private View menuView;
private LinearLayout toiLay;
private menuAnimationHelper _menuAnimationHelper;
private TocTranslateAnimation _tocTranslateAnimation;
private CustomWebView _customWebView;
public CustomWebView(Context context) {
super(context);
this.ctx = context;
this.setup(context);
}
public CustomWebView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.ctx = context;
this.setup(context);
}
public CustomWebView(Context context, AttributeSet attrs) {
super(context, attrs);
this.ctx = context;
this.setup(context);
}
//*****************************************************
//*
//* Touch Listeners
//*
//*****************************************************
private boolean mScrolling = false;
private float mScrollDiffY = 0;
private float mLastTouchY = 0;
private float mScrollDiffX = 0;
private float mLastTouchX = 0;
#Override
public boolean onTouch(View v, MotionEvent event) {
float xPoint = getDensityIndependentValue(event.getX(), ctx) / getDensityIndependentValue(this.getScale(), ctx);
float yPoint = getDensityIndependentValue(event.getY(), ctx) / getDensityIndependentValue(this.getScale(), ctx);
// TODO: Need to update this to use this.getScale() as a factor.
//Log.d(TAG, "onTouch " + xPoint + " , " + yPoint);
closeMenu();
if(event.getAction() == MotionEvent.ACTION_DOWN){
final String startTouchUrl = String.format("javascript:android.selection.startTouch(%f, %f);",
xPoint, yPoint);
mLastTouchX = xPoint;
mLastTouchY = yPoint;
((Activity)this.ctx).runOnUiThread(new Runnable() {
#Override
public void run() {
loadUrl(startTouchUrl);
}
});
// This two line clones the onLongClick()
longClickHandler.removeCallbacks(longClickRunnable);
longClickHandler.postDelayed(longClickRunnable,300);
}
else if(event.getAction() == MotionEvent.ACTION_UP){
// Check for scrolling flag
if(!mScrolling){
this.endSelectionMode();
}
// This line clones the onLongClick()
longClickHandler.removeCallbacks(longClickRunnable);
mScrollDiffX = 0;
mScrollDiffY = 0;
mScrolling = false;
}else if(event.getAction() == MotionEvent.ACTION_MOVE){
mScrollDiffX += (xPoint - mLastTouchX);
mScrollDiffY += (yPoint - mLastTouchY);
mLastTouchX = xPoint;
mLastTouchY = yPoint;
// Only account for legitimate movement.
if(Math.abs(mScrollDiffX) > 10 || Math.abs(mScrollDiffY) > 10){
mScrolling = true;
}
// This line clones the onLongClick()
longClickHandler.removeCallbacks(longClickRunnable);
}
// If this is in selection mode, then nothing else should handle this touch
return false;
}
/**
* Pass References of Left & Right Menu
*/
public void initMenu(LinearLayout _toiLay,View _menuView,menuAnimationHelper menuAnimationHelper,
TocTranslateAnimation tocTranslateAnimation){
toiLay = _toiLay;
menuView = _menuView;
_menuAnimationHelper = menuAnimationHelper;
_tocTranslateAnimation = tocTranslateAnimation;
}
private void closeMenu(){
if(_menuAnimationHelper != null && _menuAnimationHelper.isMenuOpenBool){
_menuAnimationHelper.close(menuView);
_menuAnimationHelper.isMenuOpenBool = false;
}
if(_tocTranslateAnimation != null && _tocTranslateAnimation.isTocListOpenBool){
_tocTranslateAnimation.close(toiLay);
_tocTranslateAnimation.isTocListOpenBool = false;
}
}
public void removeOverlay(){
Log.d("JsHandler", "in java removeOverlay" + mScrolling);
this.endSelectionMode();
mScrollDiffX = 0;
mScrollDiffY = 0;
mScrolling = false;
}
#Override
public boolean onLongClick(View v){
Log.d(TAG, "from webView onLongClick ");
mScrolling = true;
((Activity)this.ctx).runOnUiThread(new Runnable() {
#Override
public void run() {
loadUrl("javascript:android.selection.longTouch()");
}
});
Toast.makeText(ctx, "Long click is clicked ", Toast.LENGTH_LONG).show();
// Don't let the webview handle it
return true;
}
//*****************************************************
//*
//* Setup
//*
//*****************************************************
ContextMenu.ContextMenuInfo contextMenuInfo;
/**
* Setups up the web view.
* #param context
*/
protected void setup(Context context){
// On Touch Listener
this.setOnTouchListener(this);
this.setClickable(false);
this.setLongClickable(true);
this.setOnLongClickListener(this);
contextMenuInfo = this.getContextMenuInfo();
// Webview setup
this.getSettings().setJavaScriptEnabled(true);
this.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
// Create the selection handles
createSelectionLayer(context);
// Set to the empty region
Region region = new Region();
region.setEmpty();
_customWebView = this;
this.lastSelectedRegion = region;
}
/**
* To clone OnLongClick Listener because its not responding for version 4.1
*/
public Runnable longClickRunnable = new Runnable() {
public void run() {
longClickHandler.sendEmptyMessage(0);
}
};
public Handler longClickHandler = new Handler(){
public void handleMessage(Message m){
_customWebView.loadUrl("javascript:android.selection.longTouch();");
mScrolling = true;
}
};
public WebTextSelectionJSInterface getTextSelectionJsInterface(){
return this;
}
//*****************************************************
//*
//* Selection Layer Handling
//*
//*****************************************************
/**
* Creates the selection layer.
*
* #param context
*/
protected void createSelectionLayer(Context context){
LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.mSelectionDragLayer = (DragLayer) inflater.inflate(R.layout.selection_drag_layer, null);
// Make sure it's filling parent
this.mDragController = new DragController(context);
this.mDragController.setDragListener(this);
this.mDragController.addDropTarget(mSelectionDragLayer);
this.mSelectionDragLayer.setDragController(mDragController);
this.mStartSelectionHandle = (ImageView) this.mSelectionDragLayer.findViewById(R.id.startHandle);
this.mStartSelectionHandle.setTag(new Integer(SELECTION_START_HANDLE));
this.mEndSelectionHandle = (ImageView) this.mSelectionDragLayer.findViewById(R.id.endHandle);
this.mEndSelectionHandle.setTag(new Integer(SELECTION_END_HANDLE));
OnTouchListener handleTouchListener = new OnTouchListener(){
#Override
public boolean onTouch(View v, MotionEvent event) {
boolean handledHere = false;
final int action = event.getAction();
// Down event starts drag for handle.
if (action == MotionEvent.ACTION_DOWN) {
handledHere = startDrag (v);
mLastTouchedSelectionHandle = (Integer) v.getTag();
}
return handledHere;
}
};
this.mStartSelectionHandle.setOnTouchListener(handleTouchListener);
this.mEndSelectionHandle.setOnTouchListener(handleTouchListener);
}
/**
* Starts selection mode on the UI thread
*/
private Handler startSelectionModeHandler = new Handler(){
public void handleMessage(Message m){
if(mSelectionBounds == null)
return;
addView(mSelectionDragLayer);
drawSelectionHandles();
int contentHeight = (int) Math.ceil(getDensityDependentValue(getContentHeight(), ctx));
// Update Layout Params
ViewGroup.LayoutParams layerParams = mSelectionDragLayer.getLayoutParams();
layerParams.height = contentHeight;
layerParams.width = contentWidth;
mSelectionDragLayer.setLayoutParams(layerParams);
}
};
/**
* Starts selection mode.
*
* #param selectionBounds
*/
public void startSelectionMode(){
this.startSelectionModeHandler.sendEmptyMessage(0);
}
// Ends selection mode on the UI thread
private Handler endSelectionModeHandler = new Handler(){
public void handleMessage(Message m){
//Log.d("TableContentsWithDisplay", "in endSelectionModeHandler");
removeView(mSelectionDragLayer);
if(getParent() != null && mContextMenu != null && contextMenuVisible){
// This will throw an error if the webview is being redrawn.
// No error handling needed, just need to stop the crash.
try{
mContextMenu.dismiss();
}
catch(Exception e){
}
}
mSelectionBounds = null;
mLastTouchedSelectionHandle = -1;
try {
((Activity)ctx).runOnUiThread(new Runnable() {
#Override
public void run() {
loadUrl("javascript: android.selection.clearSelection();");
}
});
} catch (Exception e) {
// TODO: handle exception
}
}
};
/**
* Ends selection mode.
*/
public void endSelectionMode(){
this.endSelectionModeHandler.sendEmptyMessage(0);
}
/**
* Calls the handler for drawing the selection handles.
*/
private void drawSelectionHandles(){
this.drawSelectionHandlesHandler.sendEmptyMessage(0);
}
/**
* Handler for drawing the selection handles on the UI thread.
*/
private Handler drawSelectionHandlesHandler = new Handler(){
public void handleMessage(Message m){
MyAbsoluteLayout.LayoutParams startParams = (com.epubreader.drag.MyAbsoluteLayout.LayoutParams) mStartSelectionHandle.getLayoutParams();
startParams.x = (int) (mSelectionBounds.left - mStartSelectionHandle.getDrawable().getIntrinsicWidth());
startParams.y = (int) (mSelectionBounds.top - mStartSelectionHandle.getDrawable().getIntrinsicHeight());
// Stay on screen.
startParams.x = (startParams.x < 0) ? 0 : startParams.x;
startParams.y = (startParams.y < 0) ? 0 : startParams.y;
mStartSelectionHandle.setLayoutParams(startParams);
MyAbsoluteLayout.LayoutParams endParams = (com.epubreader.drag.MyAbsoluteLayout.LayoutParams) mEndSelectionHandle.getLayoutParams();
endParams.x = (int) mSelectionBounds.right;
endParams.y = (int) mSelectionBounds.bottom;
endParams.x = (endParams.x < 0) ? 0 : endParams.x;
endParams.y = (endParams.y < 0) ? 0 : endParams.y;
mEndSelectionHandle.setLayoutParams(endParams);
}
};
/**
* Checks to see if this view is in selection mode.
* #return
*/
public boolean isInSelectionMode(){
return this.mSelectionDragLayer.getParent() != null;
}
//*****************************************************
//*
//* DragListener Methods
//*
//*****************************************************
/**
* Start dragging a view.
*
*/
private boolean startDrag (View v)
{
// Let the DragController initiate a drag-drop sequence.
// I use the dragInfo to pass along the object being dragged.
// I'm not sure how the Launcher designers do this.
Object dragInfo = v;
mDragController.startDrag (v, mSelectionDragLayer, dragInfo, DragController.DRAG_ACTION_MOVE);
return true;
}
#Override
public void onDragStart(DragSource source, Object info, int dragAction) {
// TODO Auto-generated method stub
}
#Override#SuppressWarnings("deprecation")
public void onDragEnd() {
// TODO Auto-generated method stub
MyAbsoluteLayout.LayoutParams startHandleParams = (MyAbsoluteLayout.LayoutParams) this.mStartSelectionHandle.getLayoutParams();
MyAbsoluteLayout.LayoutParams endHandleParams = (MyAbsoluteLayout.LayoutParams) this.mEndSelectionHandle.getLayoutParams();
float scale = getDensityIndependentValue(this.getScale(), ctx);
float startX = startHandleParams.x - this.getScrollX();
float startY = startHandleParams.y - this.getScrollY();
float endX = endHandleParams.x - this.getScrollX();
float endY = endHandleParams.y - this.getScrollY();
startX = getDensityIndependentValue(startX, ctx) / scale;
startY = getDensityIndependentValue(startY, ctx) / scale;
endX = getDensityIndependentValue(endX, ctx) / scale;
endY = getDensityIndependentValue(endY, ctx) / scale;
if(mLastTouchedSelectionHandle == SELECTION_START_HANDLE && startX > 0 && startY > 0){
final String saveStartString = String.format("javascript: android.selection.setStartPos(%f, %f);", startX, startY);
((Activity)ctx).runOnUiThread(new Runnable() {
#Override
public void run() {
loadUrl(saveStartString);
}
});
}
if(mLastTouchedSelectionHandle == SELECTION_END_HANDLE && endX > 0 && endY > 0){
final String saveEndString = String.format("javascript: android.selection.setEndPos(%f, %f);", endX, endY);
((Activity)ctx).runOnUiThread(new Runnable() {
#Override
public void run() {
loadUrl(saveEndString);
}
});
}
}
//*****************************************************
//*
//* Context Menu Creation
//*
//*****************************************************
/**
* Shows the context menu using the given region as an anchor point.
* #param region
*/
private void showContextMenu(Rect displayRect){
// Don't show this twice
if(this.contextMenuVisible){
return;
}
// Don't use empty rect
//if(displayRect.isEmpty()){
if(displayRect.right <= displayRect.left){
return;
}
//Copy action item
ActionItem buttonOne = new ActionItem();
buttonOne.setTitle("HighLight");
buttonOne.setActionId(1);
//buttonOne.setIcon(getResources().getDrawable(R.drawable.menu_search));
//Highlight action item
ActionItem buttonTwo = new ActionItem();
buttonTwo.setTitle("Note");
buttonTwo.setActionId(2);
//buttonTwo.setIcon(getResources().getDrawable(R.drawable.menu_info));
ActionItem buttonThree = new ActionItem();
buttonThree.setTitle("Help");
buttonThree.setActionId(3);
//buttonThree.setIcon(getResources().getDrawable(R.drawable.menu_eraser));
// The action menu
mContextMenu = new QuickAction(this.getContext());
mContextMenu.setOnDismissListener(this);
// Add buttons
mContextMenu.addActionItem(buttonOne);
mContextMenu.addActionItem(buttonTwo);
mContextMenu.addActionItem(buttonThree);
//setup the action item click listener
mContextMenu.setOnActionItemClickListener(new QuickAction.OnActionItemClickListener() {
#Override
public void onItemClick(QuickAction source, int pos,
int actionId) {
if (actionId == 1) {
callHighLight();
}
else if (actionId == 2) {
callNote();
}
else if (actionId == 3) {
// Do Button 3 stuff
Log.i(TAG, "Hit Button 3");
}
contextMenuVisible = false;
}
});
this.contextMenuVisible = true;
mContextMenu.show(this, displayRect);
}
private void callHighLight(){
((Activity)this.ctx).runOnUiThread(new Runnable() {
#Override
public void run() {
loadUrl("javascript:init_txt_selection_event()");
loadUrl("javascript:highlightme_("+0+")");
}
});
}
private void callNote(){
((Activity)this.ctx).runOnUiThread(new Runnable() {
#Override
public void run() {
loadUrl("javascript:init_txt_selection_event()");
loadUrl("javascript:fnGetUserAddedNote('1')");
}
});
}
//*****************************************************
//*
//* OnDismiss Listener
//*
//*****************************************************
/**
* Clears the selection when the context menu is dismissed.
*/
public void onDismiss(){
//clearSelection();
this.contextMenuVisible = false;
}
//*****************************************************
//*
//* Text Selection Javascript Interface Listener
//*
//*****************************************************
/**
* The user has started dragging the selection handles.
*/
public void tsjiStartSelectionMode(){
this.startSelectionMode();
}
/**
* The user has stopped dragging the selection handles.
*/
public void tsjiEndSelectionMode(){
this.endSelectionMode();
}
/**
* The selection has changed
* #param range
* #param text
* #param handleBounds
* #param menuBounds
* #param showHighlight
* #param showUnHighlight
*/#SuppressWarnings("deprecation")
public void tsjiSelectionChanged(String range, String text, String handleBounds, String menuBounds){
try {
//Log.d(TAG, "tsjiSelectionChanged :- handleBounds " + handleBounds);
JSONObject selectionBoundsObject = new JSONObject(handleBounds);
float scale = getDensityIndependentValue(this.getScale(), ctx);
Rect handleRect = new Rect();
handleRect.left = (int) (getDensityDependentValue(selectionBoundsObject.getInt("left"), getContext()) * scale);
handleRect.top = (int) (getDensityDependentValue(selectionBoundsObject.getInt("top"), getContext()) * scale);
handleRect.right = (int) (getDensityDependentValue(selectionBoundsObject.getInt("right"), getContext()) * scale);
handleRect.bottom = (int) (getDensityDependentValue(selectionBoundsObject.getInt("bottom"), getContext()) * scale);
this.mSelectionBounds = handleRect;
this.selectedRange = range;
this.selectedText = text;
JSONObject menuBoundsObject = new JSONObject(menuBounds);
Rect displayRect = new Rect();
displayRect.left = (int) (getDensityDependentValue(menuBoundsObject.getInt("left"), getContext()) * scale);
displayRect.top = (int) (getDensityDependentValue(menuBoundsObject.getInt("top") - 25, getContext()) * scale);
displayRect.right = (int) (getDensityDependentValue(menuBoundsObject.getInt("right"), getContext()) * scale);
displayRect.bottom = (int) (getDensityDependentValue(menuBoundsObject.getInt("bottom") + 25, getContext()) * scale);
if(!this.isInSelectionMode()){
this.startSelectionMode();
}
// This will send the menu rect
this.showContextMenu(displayRect);
drawSelectionHandles();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* Receives the content width for the page.
*/
public void tsjiSetContentWidth(float contentWidth){
this.contentWidth = (int) this.getDensityDependentValue(contentWidth, ctx);
}
//*****************************************************
//*
//* Density Conversion
//*
//*****************************************************
/**
* Returns the density dependent value of the given float
* #param val
* #param ctx
* #return
*/
public float getDensityDependentValue(float val, Context ctx){
// Get display from context
Display display = ((WindowManager) ctx.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
// Calculate min bound based on metrics
DisplayMetrics metrics = new DisplayMetrics();
display.getMetrics(metrics);
return val * (metrics.densityDpi / 160f);
}
/**
* Returns the density independent value of the given float
* #param val
* #param ctx
* #return
*/
public float getDensityIndependentValue(float val, Context ctx){
// Get display from context
Display display = ((WindowManager) ctx.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
// Calculate min bound based on metrics
DisplayMetrics metrics = new DisplayMetrics();
display.getMetrics(metrics);
return val / (metrics.densityDpi / 160f);
}
}
Thanks In Advance!
I realize this is an old question, but there is not an accepted answer, and none of the provided answers have many votes.
I have achieved what you are trying to accomplish by creating a custom action mode callback. This allows the creation of a custom contextual action bar (CAB) when (in the case of a WebView) a user long-clicks the view. NOTE: This only works in 4.0+ and one piece only works in 4.4.
Create a new Android XML file containing the layout for your custom menu. Here is mine (context_menu.xml) as an example:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="#+id/copy"
android:icon="#drawable/ic_action_copy"
android:showAsAction="always" <!-- Forces this button to be shown -->
android:title="#string/copy">
</item>
<item
android:id="#+id/button2"
android:icon="#drawable/menu_button2icon"
android:showAsAction="ifRoom" <!-- Show if there is room on the screen-->
android:title="#string/button2">
</item>
<!-- Add as many more items as you want.
Note that if you use "ifRoom", an overflow menu will populate
to hold the action items that did not fit in the action bar. -->
</menu>
Now that the menu is defined, create a callback for it:
public class CustomWebView extends WebView {
private ActionMode.Callback mActionModeCallback;
private class CustomActionModeCallback implements ActionMode.Callback {
// Called when the action mode is created; startActionMode() was called
#Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
// Inflate a menu resource providing context menu items
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.context_menu, menu);
return true;
}
// Called each time the action mode is shown.
// Always called after onCreateActionMode, but
// may be called multiple times if the mode is invalidated.
#Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
// Note: This is called every time the selection handlebars move.
return false; // Return false if nothing is done
}
// Called when the user selects a contextual menu item
#Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch (item.getItemId()) {
case R.id.copy:
// Do some stuff for this button
mode.finish(); // Action picked, so close the CAB
return true;
case R.id.button2:
// Do some stuff for this button
mode.finish();
return true;
// Create a case for every item
...
default:
mode.finish();
return false;
}
}
// Called when the user exits the action mode
#Override
public void onDestroyActionMode(ActionMode mode) {
// This will clear the selection highlight and handlebars.
// However, it only works in 4.4; I am still investigating
// how to reliably clear the selection in 4.3 and earlier
clearFocus();
}
}
Once those pieces are in place, override the startActionMode method so that the callback will actually occur on a long-click:
public class CustomWebView extends WebView {
#Override
public ActionMode startActionMode(Callback callback) {
ViewParent parent = getParent();
if (parent == null) {
return null;
}
mActionModeCallback = new CustomActionModeCallback();
return parent.startActionModeForChild(this, mActionModeCallback);
}
}
Now you have a custom menu that will be appear and populate when a user long-clicks your WebView. For reference, I found this information from an Android Developer tutorial and modified the suggestion from this answer.
One final note: This technique overrides the native copy/paste menu for selected text. If you want to maintain that functionality, you will need to implement it yourself. (That is why my first button is 'copy'.) If you need that, refer to this Google tutorial for more information and the proper way to implement it.
Use could the setOnTouchListener() for long/short long press. and return true so that nothing happens thereby overriding the default text selection feature.
I have been able to resolve this. I was also facing this issue and could not find any solution on the web.
So, if you set up a LongClick listener, the Webview would stop showing selection at all. After delving deep into the Webview code, I found that it was calling WebView's method startRunMode and passing an instance of SelectActionCallbackMode class.
I simply extended the Webview class and overrided the startRunMode method like this:
public ActionMode startActionMode(ActionMode.Callback callback)
{
actionModeCallback = new CustomizedSelectActionModeCallback();
return super.startActionMode(actionModeCallback);
}
This forced the Webview to display my Callback instead of displaying Webview's default one. This ensured that selection worked as smoothly as before and my CAB was displayed each time selection was made. Only caveat was that I had to write code to dismiss the CAB myself.
Tested on 4.1, 4.2 and 4.3 devices.
Hope this helps.
I could suggest a workaround for this.
You could use setOnTouchListener and then implement the long press yourself.
onTouch --
case MotionEvent.ACTION_DOWN:
mHanlder.removeCallbacks(startActionBar);
mHandler.postDelayed(startActionBar,1000);
This way you could achieve the same aciton.
some reason the KeyEvent down & up doesn't work in API LEVEL 16+ (Android 4.1+ JELLY_BEAN). It doesn't fire the WebView's loadUrl. So I had to replace the dispatchKeyEvent with dispatchTouchEvent. Here's the code:
...
MotionEvent touchDown = MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_DOWN, touchX, touchY, 0);
webView.dispatchTouchEvent(touchDown);
touchDown.recycle();
MotionEvent touchUp = MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_UP, touchX, touchY, 0);
webView.dispatchTouchEvent(touchUp);
touchUp.recycle();
String url = mUrl;
...
try it..
For disabling your text selection from webview try this,
webView.setWebChromeClient(new WebChromeClient(){
[.... other overrides....]
// #Override
// https://bugzilla.wikimedia.org/show_bug.cgi?id=31484
// If you DO NOT want to start selection by long click,
// the remove this function
// (All this is undocumented stuff...)
public void onSelectionStart(WebView view) {
// By default we cancel the selection again, thus disabling
// text selection unless the chrome client supports it.
// view.notifySelectDialogDismissed();
}
});
You might also try overriding View.performLongClick(), which is responsible for calling View.onLongPress(). You could also try going up to the parent View's long press events. Or all the way up to the Window.Callback for your activity (via Activity.getWindow().get/setCallback()).
I'm wondering whether there are other ways for the standard selection context menu to appear besides the long-press event, for example maybe with a trackball or hardware keyboard.
in case someone is trying to simply remove the default text selection, I had the same issue on a Samsung Galaxy Tab on Android 4.1.2 and ended up writing my own WebView:
public class CustomWebView extends WebView {
public CustomWebView(Context context) {
super(context);
this.setUp(context);
}
public CustomWebView(Context context, AttributeSet attrs) {
super(context, attrs);
this.setUp(context);
}
public CustomWebView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.setUp(context);
}
private void setUp(Context context) {
this.setOnLongClickListener(new OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
return true;
}
});
this.setLongClickable(false);
}
#Override
public boolean performLongClick() {
return true;
}
}
and referring it in my xml:
<com...CustomWebView
android:id="#+id/webview"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
Use setOnTouchListener() implement long press
Hello all i have the code below which produces four wheels each with the numbers 0-9. I think these numbers are being called for each wheel in the section of code after:
/**
* Initializes wheel
* #param id the wheel widget Id
*/
Is there a way i can change this so i can set certain WORDS instead of NUMBERS for each one of the four wheels like and array or string.
So i would have four arrays (strings) with different words for each wheel.
Thanks in advance.
public class PasswActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.passw_layout);
initWheel(R.id.passw_1);
initWheel(R.id.passw_2);
initWheel(R.id.passw_3);
initWheel(R.id.passw_4);
Button mix = (Button)findViewById(R.id.btn_mix);
mix.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mixWheel(R.id.passw_1);
mixWheel(R.id.passw_2);
mixWheel(R.id.passw_3);
mixWheel(R.id.passw_4);
}
});
}
// Wheel scrolled flag
private boolean wheelScrolled = false;
// Wheel scrolled listener
OnWheelScrollListener scrolledListener = new OnWheelScrollListener() {
public void onScrollingStarted(WheelView wheel) {
wheelScrolled = true;
}
public void onScrollingFinished(WheelView wheel) {
wheelScrolled = false;
}
};
// Wheel changed listener
private OnWheelChangedListener changedListener = new OnWheelChangedListener() {
public void onChanged(WheelView wheel, int oldValue, int newValue) {
if (!wheelScrolled) {
}
}
};
/**
* Initializes wheel
* #param id the wheel widget Id
*/
private void initWheel(int id) {
WheelView wheel = getWheel(id);
wheel.setViewAdapter(new NumericWheelAdapter(this, 0, 9));
wheel.setCurrentItem((int)(Math.random() * 10));
wheel.addChangingListener(changedListener);
wheel.addScrollingListener(scrolledListener);
wheel.setCyclic(true);
wheel.setInterpolator(new AnticipateOvershootInterpolator());
}
/**
* Returns wheel by Id
* #param id the wheel Id
* #return the wheel with passed Id
*/
private WheelView getWheel(int id) {
return (WheelView) findViewById(id);
}
/**
* Tests entered PIN
* #param v1
* #param v2
* #param v3
* #param v4
* #return true
*/
private boolean testPin(int v1, int v2, int v3, int v4) {
return testWheelValue(R.id.passw_1, v1) && testWheelValue(R.id.passw_2, v2) &&
testWheelValue(R.id.passw_3, v3) && testWheelValue(R.id.passw_4, v4);
}
/**
* Tests wheel value
* #param id the wheel Id
* #param value the value to test
* #return true if wheel value is equal to passed value
*/
private boolean testWheelValue(int id, int value) {
return getWheel(id).getCurrentItem() == value;
}
/**
* Mixes wheel
* #param id the wheel id
*/
private void mixWheel(int id) {
WheelView wheel = getWheel(id);
wheel.scroll(-25 + (int)(Math.random() * 50), 2000);
}
}
Just use an ArrayWheelAdapter<T> instead of the NumericWheelAdapter.
If you look closely at your own code, you will find a line where your adapter is created
new NumericWheelAdapter(this, 0, 9)
An adaptor is something the wheel UI can hook onto and grab data to display. This will create an adapter containing the numbers zero through nine. To create an adapter that displays the words "Abc", "Foo", and "Bar" use this.
new ArrayWheelAdapter<String>(this, new String[]{"Abc", "Foo", "Bar"})