onRestoreInstanceState(Bundle savedInstanceState)
is not geting called, I am pasting my code below. Actually I want to redraw all the points that are saved when my activity went in background.
package com.geniteam.mytest;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
public class Tutorial2D extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(new Panel(this));
}
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
Panel panel = new Panel(this);
outState.putSerializable("test", panel._graphics);
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
Panel panel = new Panel(this);
panel.set_graphics((ArrayList<GraphicObject>) savedInstanceState.getSerializable("test"));
}
class Panel extends SurfaceView implements SurfaceHolder.Callback {
private TutorialThread _thread;
private ArrayList<GraphicObject> _graphics = new ArrayList<GraphicObject>();
public ArrayList<GraphicObject> get_graphics() {
return _graphics;
}
public void set_graphics(ArrayList<GraphicObject> graphics) {
_graphics = graphics;
}
public Panel(Context context) {
super(context);
getHolder().addCallback(this);
_thread = new TutorialThread(getHolder(), this);
setFocusable(true);
}
#Override
public boolean onTouchEvent(MotionEvent event) {
synchronized (_thread.getSurfaceHolder()) {
// if (event.getAction() == MotionEvent.ACTION_DOWN) {
GraphicObject graphic = new GraphicObject(BitmapFactory.decodeResource(getResources(), R.drawable.icon));
graphic.getCoordinates().setX((int) event.getX() - graphic.getGraphic().getWidth() / 2);
graphic.getCoordinates().setY((int) event.getY() - graphic.getGraphic().getHeight() / 2);
_graphics.add(graphic);
//}
return true;
}
}
#Override
public void onDraw(Canvas canvas) {
canvas.drawColor(Color.BLACK);
Bitmap bitmap;
GraphicObject.Coordinates coords;
for (GraphicObject graphic : _graphics) {
bitmap = graphic.getGraphic();
coords = graphic.getCoordinates();
canvas.drawBitmap(bitmap, coords.getX(), coords.getY(), null);
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
// TODO Auto-generated method stub
}
public void surfaceCreated(SurfaceHolder holder) {
try{
_thread.setRunning(true);
_thread.start();
}catch(Exception ex){
_thread = new TutorialThread(getHolder(), this);
_thread.start();
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// simply copied from sample application LunarLander:
// we have to tell thread to shut down & wait for it to finish, or else
// it might touch the Surface after we return and explode
boolean retry = true;
_thread.setRunning(false);
while (retry) {
try {
_thread.join();
retry = false;
} catch (InterruptedException e) {
// we will try it again and again...
}
}
}
}
class TutorialThread extends Thread {
private SurfaceHolder _surfaceHolder;
private Panel _panel;
private boolean _run = false;
public TutorialThread(SurfaceHolder surfaceHolder, Panel panel) {
_surfaceHolder = surfaceHolder;
_panel = panel;
}
public void setRunning(boolean run) {
_run = run;
}
public SurfaceHolder getSurfaceHolder() {
return _surfaceHolder;
}
#Override
public void run() {
Canvas c;
while (_run) {
c = null;
try {
c = _surfaceHolder.lockCanvas(null);
synchronized (_surfaceHolder) {
_panel.onDraw(c);
}
} finally {
// do this in a finally so that if an exception is thrown
// during the above, we don't leave the Surface in an
// inconsistent state
if (c != null) {
_surfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
}
class GraphicObject {
/**
* Contains the coordinates of the graphic.
*/
public class Coordinates {
private int _x = 100;
private int _y = 0;
public int getX() {
return _x + _bitmap.getWidth() / 2;
}
public void setX(int value) {
_x = value - _bitmap.getWidth() / 2;
}
public int getY() {
return _y + _bitmap.getHeight() / 2;
}
public void setY(int value) {
_y = value - _bitmap.getHeight() / 2;
}
public String toString() {
return "Coordinates: (" + _x + "/" + _y + ")";
}
}
private Bitmap _bitmap;
private Coordinates _coordinates;
public GraphicObject(Bitmap bitmap) {
_bitmap = bitmap;
_coordinates = new Coordinates();
}
public Bitmap getGraphic() {
return _bitmap;
}
public Coordinates getCoordinates() {
return _coordinates;
}
}
}
onRestoreInstanceState only gets called if the app is destroyed and re-created. Putting the app in the background then bringing it up again will call onResume, but not onRestoreInstanceState.
Related
When I restart my App, I mean when I press the Homebutton and start it from the Task window, or when I debug it while it is still runnning the whole screen went black!
This is my MainView:
package net.kex.toll;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
public class MainView extends SurfaceView implements SurfaceHolder.Callback{
public GameLoop gameLoop;
public Player player;
private int playerX = 50;
private int playerY = 50;
public MainView(final Context context) {
super(context);
getHolder().addCallback(this);
player = new Player();
this.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
playerX = playerX + 20;
playerY = playerY + 20;
player.play();
return false;
}
}
);
setFocusable(true);
}
public void surfaceChanged(SurfaceHolder surfaceHolder, int foramt, int width, int height){
}
public void surfaceDestroyed(SurfaceHolder surfaceHolder){
boolean retry = true;
while (true) {
try {
gameLoop.setRunning(false);
gameLoop.join();
} catch (Exception e) { e.printStackTrace();}
retry = false;
}
}
public void surfaceCreated(SurfaceHolder surfaceHolder){
gameLoop = new GameLoop(getHolder(), this);
gameLoop.setRunning(true);
gameLoop.start();
}
public void update(){
player.update();
}
public void draw(Canvas canvas){
if(canvas == null) {
return;
}
canvas.drawColor(Color.WHITE);
player.draw(canvas);
}
}
This is my GameLoop:
package net.kex.toll;
import android.graphics.Canvas;
import android.util.Log;
import android.view.SurfaceHolder;
public class GameLoop extends Thread {
public static final int MAX_FPS = 30;
private double averageFPS;
private MainView mainView;
private SurfaceHolder surfaceHolder;
private boolean running;
public static Canvas canvas;
public void setRunning(boolean running) {
this.running = running;
}
public GameLoop(SurfaceHolder surfaceHolder, MainView mainView) {
super();
this.surfaceHolder = surfaceHolder;
this.mainView = mainView;
}
#Override
public void run(){
long startTime;
long timeMillis = 1000/MAX_FPS;
long waitTime;
long frameCount = 0;
long totalTime = 0;
long targetTime = 1000/MAX_FPS;
while (running) {
startTime = System.nanoTime();
canvas = null;
try {
canvas = this.surfaceHolder.lockCanvas();
synchronized (surfaceHolder) {
this.mainView.update();
this.mainView.draw(canvas);
}
}catch (Exception e){ e.printStackTrace();}
finally {
if (canvas != null) {
try {
surfaceHolder.unlockCanvasAndPost(canvas);
}catch (Exception e){ e.printStackTrace();}
}
}
timeMillis = (System.nanoTime() - startTime)/1000000;
waitTime = targetTime - timeMillis;
try {
if (waitTime >= 0){
this.sleep(waitTime);
}
}catch (Exception e){ e.printStackTrace();}
totalTime += System.nanoTime() - startTime;
frameCount++;
if (frameCount == MAX_FPS) {
averageFPS = 1000/((totalTime/frameCount)/1000000);
frameCount = 0;
totalTime = 0;
Log.i("GameLoop", "averageFPS: " + Double.toString(averageFPS));
}
}
}
}
I don't know what to do! If you want some other class please tell me and I will send it to you!
Please help I´m sitting here and trying to solve this problem for hours!
Repaint the object, it will render it again. For example in onResume add Repaint()
I am trying to make a Simple Live wallpaper in which when user touch his screen a bitmap is drawn on that position. I am facing 2 problem, if i am drawing it in Runnable then it is continuously creating bitmaps and if i am drawing it outside then it continuously blinks. I have noticed that if i change my delay time for runnable blinking also changes and if i remove runnable completely then it is drawing fine but positions are getting weird.
Here is my code.
This one blinks continuously.
package com.example.live_wallpaper_p1;
import android.app.WallpaperManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.os.Bundle;
import android.os.Handler;
import android.service.wallpaper.WallpaperService;
import android.view.SurfaceHolder;
public class DemoWallpaperService extends WallpaperService {
#Override
public Engine onCreateEngine() {
return new DemoWallpaperEngine();
}
private class DemoWallpaperEngine extends Engine{
private boolean mVisible = false;
private final Handler mHandler = new Handler();
private Bitmap imm;
private float xcor;
private float ycor;
BitmapFactory.Options option;
DemoWallpaperEngine()
{
imm = Bitmap.createBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.icon, option));
}
private final Runnable mUpdateDisplay = new Runnable() {
#Override
public void run() {
draw();
}};
#Override
public Bundle onCommand(String action, int x, int y, int z, Bundle extras, boolean resultRequested) {
if (action.equals(WallpaperManager.COMMAND_TAP)) {
xcor=x;
ycor=y;
final SurfaceHolder holder = getSurfaceHolder();
Canvas c = null;
try {
c = holder.lockCanvas();
if (c != null) {
c.drawBitmap(imm, xcor-(imm.getWidth()/2), ycor-(imm.getHeight()/2),null);
//drawCube(c);
}
} finally {
if (c != null)
holder.unlockCanvasAndPost(c);
}
}
return null;
}
private void draw() {
SurfaceHolder holder = getSurfaceHolder();
Canvas c = null;
try {
c = holder.lockCanvas();
if (c != null) {
//do something
}
} finally {
if (c != null)
holder.unlockCanvasAndPost(c);
}
mHandler.removeCallbacks(mUpdateDisplay);
if (mVisible) {
mHandler.postDelayed(mUpdateDisplay, 10);
}
}
#Override
public void onVisibilityChanged(boolean visible) {
mVisible = visible;
if (visible) {
draw();
} else {
mHandler.removeCallbacks(mUpdateDisplay);
}
}
#Override
public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) {
draw();
}
#Override
public void onSurfaceDestroyed(SurfaceHolder holder) {
super.onSurfaceDestroyed(holder);
mVisible = false;
mHandler.removeCallbacks(mUpdateDisplay);
}
#Override
public void onDestroy() {
super.onDestroy();
mVisible = false;
mHandler.removeCallbacks(mUpdateDisplay);
}
}
}
You can try this sample code
here imageURL is http link to Image Location
Bitmap bitmap = BitmapFactory.decodeStream((InputStream)new URL(imageUrl).getContent());
holder.itemImage.setImageBitmap(bitmap);
If your Image is in Phone Memory.
use this
image.setImageResource(R.drawable.test2);
I have this code
package com.cerbertek;
import java.util.ArrayList;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Region;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class PlayGameView extends SurfaceView implements SurfaceHolder.Callback {
private CanvasThread canvasthread;
private Context mContext;
private Region firstRec;
private ArrayList<Region> regions;
private class CanvasThread extends Thread {
private SurfaceHolder _holder;
private boolean _run = false;
public CanvasThread(SurfaceHolder surfaceHolder) {
_holder = surfaceHolder;
}
public void setRunning(boolean run) {
_run = run;
}
#Override
public void run() {
Canvas c;
while (_run) {
c = null;
try {
c = _holder.lockCanvas(null);
synchronized (_holder) {
onDraw(c);
}
} finally {
if (c != null) {
_holder.unlockCanvasAndPost(c);
}
}
}
}
}
public PlayGameView (Context context, AttributeSet attrs) {
super(context, attrs);
SurfaceHolder holder = getHolder();
holder.addCallback(this);
canvasthread = new CanvasThread(getHolder());
setFocusable(true);
}
#Override
public void onDraw(Canvas canvas) {
Paint paint = new Paint ();
Bitmap wrench = BitmapFactory.decodeResource(getResources(), R.drawable.wrench);
canvas.drawColor(Color .BLACK);
for(int i = 0; i < 4; i++) {
for(int j = 0; j < 4; j++) {
int left = canvas.getWidth()/2 - wrench.getWidth()*2 + j*wrench.getWidth();
int top = 0 + i*wrench.getHeight();
canvas.drawBitmap(wrench, left, top, null);
Log.d(i + " " + j, left+ " " + top);
Region reg = new Region(left, top, left + wrench.getWidth(), top + wrench.getHeight());
regions.add(reg);
}
}
}
public ArrayList<Region> getRegions() {
return regions;
}
#Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
}
#Override
public void surfaceCreated(SurfaceHolder arg0) {
canvasthread.setRunning(true);
canvasthread.start();
}
#Override
public void surfaceDestroyed(SurfaceHolder arg0) {
boolean retry = true;
canvasthread.setRunning(false);
while (retry) {
try {
canvasthread.join();
retry = false;
} catch (InterruptedException e) {
// we will try it again and again...
}
}
}
}
in onDraw() method I want to create a Region and add it to ArrayList, that returning by getRegions() method.
But it now works!
I saw first image and then NullPoiterExeption on regions.add(reg); line.
Please hlp me
In the constructor put:
regions = new ArrayList<Region>();
You were forgetting to initialize it.
there is class, that draws on canvas some field
package com.cerbertek;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Region;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class PlayGameView extends SurfaceView implements SurfaceHolder.Callback {
private CanvasThread canvasthread;
private Context mContext;
private Region firstRec;
private class CanvasThread extends Thread {
private SurfaceHolder _holder;
private boolean _run = false;
public CanvasThread(SurfaceHolder surfaceHolder) {
_holder = surfaceHolder;
}
public void setRunning(boolean run) {
_run = run;
}
#Override
public void run() {
Canvas c;
while (_run) {
c = null;
try {
c = _holder.lockCanvas(null);
synchronized (_holder) {
onDraw(c);
}
} finally {
if (c != null) {
_holder.unlockCanvasAndPost(c);
}
}
}
}
}
public PlayGameView (Context context, AttributeSet attrs) {
super(context, attrs);
SurfaceHolder holder = getHolder();
holder.addCallback(this);
canvasthread = new CanvasThread(getHolder());
setFocusable(true);
}
#Override
public void onDraw(Canvas canvas) {
Paint paint = new Paint ();
Bitmap wrench = BitmapFactory.decodeResource(getResources(), R.drawable.wrench);
canvas.drawColor(Color .BLACK);
for(int i = 0; i < 4; i++) {
for(int j = 0; j < 4; j++) {
int left = canvas.getWidth()/2 - wrench.getWidth()*2 + j*wrench.getWidth();
int top = 0 + i*wrench.getHeight();
canvas.drawBitmap(wrench, left, top, null);
Log.d(i + " " + j, left+ " " + top);
}
}
}
#Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
}
#Override
public void surfaceCreated(SurfaceHolder arg0) {
canvasthread.setRunning(true);
canvasthread.start();
}
#Override
public void surfaceDestroyed(SurfaceHolder arg0) {
boolean retry = true;
canvasthread.setRunning(false);
while (retry) {
try {
canvasthread.join();
retry = false;
} catch (InterruptedException e) {
// we will try it again and again...
}
}
}
}
so i want to detect where i click on(for exemple there is 2 rects and i want to detect what rect i click on). i can set setOnClickListener to my view, but how to get position of click?
then i want to set the regions while drawing( it is right, yeah? or not?) and in activity i'll check is click coordinates contains regions
so
1) how can i get coord of click
2) what is the pretty good way to do do all that stuff, because my ideas are poor often
Look at the setOnTouchListener.
The OnTouchListener implements a method with the following signature:
public boolean onTouch(View v, MotionEvent event)
The MotionEvent has information about where the touch actually happened. (event.getX() and event.getY())
I am making an android game that needs to run a method continiously, kind of like a timer. I need that it is being called every second. How can i make this possible???
Java code:
import java.util.ArrayList;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.TextView;
import android.widget.Toast;
public class ExampleView extends SurfaceView implements SurfaceHolder.Callback
{
class ExampleThread extends Thread
{
private ArrayList<Parachuter> parachuters;
private Bitmap parachuter;
private Paint black;
private boolean running;
private SurfaceHolder mSurfaceHolder;
private Context mContext;
private Handler mHandler;
private GameScreenActivity mActivity;
private long frameRate;
private boolean loading;
public ExampleThread(SurfaceHolder sHolder, Context context, Handler handler)
{
mSurfaceHolder = sHolder;
mHandler = handler;
mContext = context;
mActivity = (GameScreenActivity) context;
parachuters = new ArrayList<Parachuter>();
parachuter = BitmapFactory.decodeResource(getResources(), R.drawable.parachuteman);
black = new Paint();
black.setStyle(Paint.Style.FILL);
black.setColor(Color.WHITE);
running = true;
// This equates to 26 frames per second.
frameRate = (long) (1000 / 26);
loading = true;
}
#Override
public void run()
{
while (running)
{
Canvas c = null;
try
{
c = mSurfaceHolder.lockCanvas();
synchronized (mSurfaceHolder)
{
long start = System.currentTimeMillis();
doDraw(c);
long diff = System.currentTimeMillis() - start;
if (diff < frameRate)
Thread.sleep(frameRate - diff);
}
} catch (InterruptedException e)
{
}
finally
{
if (c != null)
{
mSurfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
protected void doDraw(Canvas canvas)
{
canvas.drawRect(0, 0, canvas.getWidth(), canvas.getHeight(), black);
//Draw
for (int i = 0; i < parachuters.size(); i++)
{
canvas.drawBitmap(parachuter, parachuters.get(i).getX(), parachuters.get(i).getY(), null);
parachuters.get(i).tick();
}
//Remove
for (int i = 0; i < parachuters.size(); i++)
{
if (parachuters.get(i).getY() > canvas.getHeight())
parachuters.remove(i);
}
}
public boolean onTouchEvent(MotionEvent event)
{
if (event.getAction() != MotionEvent.ACTION_DOWN)
return false;
float x = event.getX();
float y = event.getY();
Parachuter p = new Parachuter(x, y);
parachuters.add(p);
Toast.makeText(getContext(), "x=" + x + " y=" + y, 15).show();
return true;
}
public void setRunning(boolean bRun)
{
running = bRun;
}
public boolean getRunning()
{
return running;
}
}
/** Handle to the application context, used to e.g. fetch Drawables. */
private Context mContext;
/** Pointer to the text view to display "Paused.." etc. */
private TextView mStatusText;
/** The thread that actually draws the animation */
private ExampleThread eThread;
public ExampleView(Context context)
{
super(context);
// register our interest in hearing about changes to our surface
SurfaceHolder holder = getHolder();
holder.addCallback(this);
// create thread only; it's started in surfaceCreated()
eThread = new ExampleThread(holder, context, new Handler()
{
#Override
public void handleMessage(Message m)
{
// mStatusText.setVisibility(m.getData().getInt("viz"));
// mStatusText.setText(m.getData().getString("text"));
}
});
setFocusable(true);
}
#Override
public boolean onTouchEvent(MotionEvent event)
{
return eThread.onTouchEvent(event);
}
public ExampleThread getThread()
{
return eThread;
}
#Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3)
{
// TODO Auto-generated method stub
}
public void surfaceCreated(SurfaceHolder holder)
{
if (eThread.getState() == Thread.State.TERMINATED)
{
eThread = new ExampleThread(getHolder(), getContext(), getHandler());
eThread.start();
}
else
{
eThread.start();
}
}
#Override
public void surfaceDestroyed(SurfaceHolder holder)
{
boolean retry = true;
eThread.setRunning(false);
while (retry)
{
try
{
eThread.join();
retry = false;
}
catch (InterruptedException e)
{
}
}
}
}
I need to add a function or a socalled "method", a public void or something like that, that should be called every second and should do the exact same code as the MotionEvent event method, the onTouchEvent.
Following Rob's commented link, consider (which is not the accepted answer, though) reviewing this from the Android Developer's site, Resources section: http://developer.android.com/resources/articles/timed-ui-updates.html
It describes how to use the android os Handler class to implement a timer, rather than using the Timer and TimerTask classes themselves.
This pretty much what you are looking for.
How to run a Runnable thread in Android?
It does sth every 1000ms using a thread.