I'm trying to apply expand collapse feature on Webview Based on its Content height but i'm always getting wrong value
Here is my code
public class MesuredHeightWebView extends WebView {
public MesuredHeightWebView(Context context) {
super(context);
}
public MesuredHeightWebView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MesuredHeightWebView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#Override
public void invalidate() {
super.invalidate();
if (getContentHeight() > 0) {
// WebView has displayed some content and is scrollable.
if(listener!=null)
listener.updateContentHeight(getContentHeight());
}
}
WebViewContentHeight listener;
public void setChangeContentListener(WebViewContentHeight listener) {
this.listener = listener;
}
}
and then in the fragment i tried to get the content height
webView.setWebChromeClient(new WebChromeClient(){
#Override
public void onProgressChanged(WebView view, int newProgress) {
super.onProgressChanged(view, newProgress);
if(newProgress==100)
{
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
webView.setChangeContentListener(new WebViewContentHeight() {
#Override
public void updateContentHeight(int height) {
if(height>0 && getActivity()!=null) {
System.out.println("the height2 is" + height + " " + Utils.convertPixelsToDp(height, getActivity()));
final int text_height = height;
but my problem is that i'm always getting wrong result
Thanks
Use the following methods instead of getContentHeight() method:
computeHorizontalScrollRange(); -> for width
computeVerticalScrollRange(); -> for height
these two methods will return the entire scrollable width/height rather than the actual widht/height of the webview on screen
Related
I want to expand the view on clicking the + button and this + sign changes to - when the view expanded.Again when i click the - button the view should be shrink.
Inside the view i have some TextView field.Please anyone suggest me.I am new to android.
This answer solves the question.
public class ExpandableTextView extends TextView implements OnClickListener
{
private static final int MAX_LINES = 5;
private int currentMaxLines = Integer.MAX_VALUE;
public ExpandableTextView(Context context)
{
super(context);
setOnClickListener(this);
}
public ExpandableTextView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
setOnClickListener(this);
}
public ExpandableTextView(Context context, AttributeSet attrs)
{
super(context, attrs);
setOnClickListener(this);
}
#Override
protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter)
{
/* If text longer than MAX_LINES set DrawableBottom - I'm using '...' icon */
post(new Runnable()
{
public void run()
{
if (getLineCount()>MAX_LINES)
setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, R.drawable.icon_more_text);
else
setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
setMaxLines(MAX_LINES);
}
});
}
#Override
public void setMaxLines(int maxLines)
{
currentMaxLines = maxLines;
super.setMaxLines(maxLines);
}
/* Custom method because standard getMaxLines() requires API > 16 */
public int getMyMaxLines()
{
return currentMaxLines;
}
#Override
public void onClick(View v)
{
/* Toggle between expanded collapsed states */
if (getMyMaxLines() == Integer.MAX_VALUE)
setMaxLines(MAX_LINES);
else
setMaxLines(Integer.MAX_VALUE);
}
}
You can visible or gone particular layout on button click event at runtime like below code:
findViewById(R.id.yourButtonId).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mainView.setVisibility(View.GONE);
}
});
I am getting the error: "Cannot resolve method 'super()'" in my code and I am not sure how to resolve this, do you have any clues?
The code is as follows:
public GeoView( double left, double top, double width )
{
super();
this.left = left;
this.top = top;
this.width = width;
this.transform = null;
this.backing_store = null;
this.sink = false;
this.last_size = new Rect(0, 0, 200, 200 );
this.do_tracking = false;
Drawable background = new Drawable() {
#Override
public void draw(Canvas canvas) {
}
#Override
public void setAlpha(int i) {
}
#Override
public void setColorFilter(ColorFilter colorFilter) {
}
#Override
public int getOpacity() {
return 0;
}
};
What is GeoView class? You extended it from another class?
If yes. Check that parent class have empty constructor, because you call it.
If it's your own class and it didn't extended from any other class. Then you don't need to call super().
View doesn't have empty constructor.
You should Have at least one of this constructor.
public GeoView(Context context) {
super(context);
}
public GeoView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public GeoView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
If you want to create view by yourself, you need first constructor. Then you have to
GeoView geoView = new GeoView(YourActivity.this);
Or you can simply add your view to layout. Then You second will be called constructor. I think you should add all of them.
<com.example.yourapp.GeoView
android:layout_height="300dp"
android:layout_width="match_parent"/>
I recently used TextInputLayout and it's setError() method. The problem I'm getting is, when I clear the error by calling setError(null) it leaves so much of empty space at the bottom.
Normal:
With error:
After clearing error:
After looking at the source, I found that they are making the view INVISIBLE instead of GONE
.setListener(new ViewPropertyAnimatorListenerAdapter() {
#Override
public void onAnimationEnd(View view) {
view.setVisibility(INVISIBLE); // here it is
updateLabelVisibility(true);
} }).start();
I'm wondering why is it so? How to resolve this to avoid the empty space?
Check out the docs for
public void setErrorEnabled (boolean enabled)
It says
Whether the error functionality is enabled or not in this layout.
Enabling this functionality before setting an error message via
setError(CharSequence), will mean that this layout will not change
size when an error is displayed.
Well based on this, try setting setErrorEnabled(true) before setError(), and, set setErrorEnabled(false) after setError(null).
Method setErrorEnabled(false) will clear the extra space, so call it after setError(null).
Dont use setErrorEnabled(boolean), it just doesnt show up the error from the second time.
public class MyTextInputLayout extends android.support.design.widget.TextInputLayout {
public MyTextInputLayout(Context context) {
super(context);
}
public MyTextInputLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyTextInputLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#Override
public void setError(#Nullable CharSequence error) {
super.setError(error);
View layout = getChildAt(1);
if (layout != null) {
if (error != null && !"".equals(error.toString().trim())) {
layout.setVisibility(VISIBLE);
} else {
layout.setVisibility(GONE);
}
}
}
}
Then just setError(errorMessage); or setError(null);
See this page. Google will release the fix in future support library version. It says,
If you want to fix it now you can extends the TextInputLayout and
override the setErrorEnabled() method, but I cant guarantee the
backward compatibility. Because its some danger to change state in
TextInputLayout.
public class TextInputLayout extends android.support.design.widget.TextInputLayout{
public TextInputLayout(Context context) {
super(context);
}
public TextInputLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public TextInputLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#Override
public void setErrorEnabled(boolean enabled) {
super.setErrorEnabled(enabled);
if (enabled) {
return;
}
if (getChildCount() > 1) {
View view = getChildAt(1);
if (view != null) {
view.setVisibility(View.GONE);
}
}
}
}
I create a custom view for avoiding repeated code and override setError method.
public class UserInputView extends TextInputLayout {
public UserInputView(Context context) {
this(context, null);
}
public UserInputView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public UserInputView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#Override
public void setError(#Nullable CharSequence error) {
boolean isErrorEnabled = error != null;
setErrorEnabled(isErrorEnabled);
super.setError(error);
}
}
The source code of TextInputLayout show the following:
If you need to clear the error, just use
til.setErrorEnabled(false);
This will hide the error text and stretch the bottom space to its standard size.
In case you need to set the error again, just use
til.setError("Your text");
which automatically calls til.setErrorEnabled(true) as it assumes you need the error functionality.
This is extension in kotlin solving problem:
fun TextInputLayout.clearError() {
error = null
isErrorEnabled = false
}
The following code works fine
textInputLatout.getEditText().addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (s.length() < 1) {
textInputLayout.setErrorEnabled(true);
textInputLayout.setError("Please enter a value");
}
if (s.length() > 0) {
textInputLayout.setError(null);
textInputLayout.setErrorEnabled(false);
}
}
#Override
public void afterTextChanged(Editable s) {
}
});
By using mTextInputLayout.setErrorEnabled(false); i have solved this problem
Then you should override it like so:
#Override
public void onAnimationEnd(View view)
{
view.setVisibility(GONE); // <-- this is where you make it GONE
updateLabelVisibility(true);
}
Or try this i.e. on a button or whatever you are using:
final Button btn = (Button) findViewById(R.id.btn);
btn.setVisibility(View.GONE); //<--- makes the button gone
I got a bunch of drawables that I want to load using fresco, I want to use wrap_content size for those images, how can I do it in xml with fresco? Or if xml is not possible how do you do it in code?
<com.facebook.drawee.view.SimpleDraweeView
android:id="#+id/myImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
fresco:placeholderImage="#mipmap/myImage"/>
The above code is not working unless I set a fixed size.
I am part of the Fresco team and I was the one who made the design decision to not support wrap-content. The rationale is explained in the documentation. But in short, the problem is that you can't guarantee that the image will be available immediately (you may need to fetch it first) and that means that the view size would have to change once the image arrives. This is in most cases not desirable and you should probably rethink your UI.
Anyways, if you really really need/want to do that, you can do it like this:
void updateViewSize(#Nullable ImageInfo imageInfo) {
if (imageInfo != null) {
draweeView.getLayoutParams().width = imageInfo.getWidth();
draweeView.getLayoutParams().height = ViewGroup.LayoutParams.WRAP_CONTENT;
draweeView.setAspectRatio((float) imageInfo.getWidth() / imageInfo.getHeight());
}
}
ControllerListener listener = new BaseControllerListener {
#Override
public void onIntermediateImageSet(String id, #Nullable ImageInfo imageInfo) {
updateViewSize(imageInfo);
}
#Override
public void onFinalImageSet(String id, #Nullable ImageInfo imageInfo, #Nullable Animatable animatable) {
updateViewSize(imageInfo);
}
};
DraweeController controller = draweeControllerBuilder
.setUri(uri)
.setControllerListener(listener)
.build();
draweeView.setController(controller);
I wrote this code from the top of my head, I haven't actually tested it. But the idea should be clear, and it should work with minor adjustments.
Based on #plamenko's answer, I made a custom view as follows:
/**
* Works when either height or width is set to wrap_content
* The view is resized based on the image fetched
*/
public class WrapContentDraweeView extends SimpleDraweeView {
// we set a listener and update the view's aspect ratio depending on the loaded image
private final ControllerListener listener = new BaseControllerListener<ImageInfo>() {
#Override
public void onIntermediateImageSet(String id, #Nullable ImageInfo imageInfo) {
updateViewSize(imageInfo);
}
#Override
public void onFinalImageSet(String id, #Nullable ImageInfo imageInfo, #Nullable Animatable animatable) {
updateViewSize(imageInfo);
}
};
public WrapContentDraweeView(Context context, GenericDraweeHierarchy hierarchy) {
super(context, hierarchy);
}
public WrapContentDraweeView(Context context) {
super(context);
}
public WrapContentDraweeView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public WrapContentDraweeView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public WrapContentDraweeView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
#Override
public void setImageURI(Uri uri, Object callerContext) {
DraweeController controller = ((PipelineDraweeControllerBuilder)getControllerBuilder())
.setControllerListener(listener)
.setCallerContext(callerContext)
.setUri(uri)
.setOldController(getController())
.build();
setController(controller);
}
void updateViewSize(#Nullable ImageInfo imageInfo) {
if (imageInfo != null) {
setAspectRatio((float) imageInfo.getWidth() / imageInfo.getHeight());
}
}
}
You can include this class in the XML, an example usage:
<com.example.ui.views.WrapContentDraweeView
android:id="#+id/simple_drawee_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
In Kotlin you can try something like this :
val listener = object : BaseControllerListener<ImageInfo>() {
override fun onFinalImageSet(id: String?, imageInfo: ImageInfo?, animatable: Animatable?) {
super.onFinalImageSet(id, imageInfo, animatable)
itemView.draweeGif.layoutParams.height = ViewGroup.LayoutParams.WRAP_CONTENT
itemView.draweeGif.aspectRatio = (imageInfo?.width?.toFloat() ?: 0.toFloat()) / (imageInfo?.height?.toFloat() ?: 0.toFloat())
}
}
val controller = Fresco.newDraweeControllerBuilder()
.setUri(uriGif)
.setControllerListener(listener)
.setAutoPlayAnimations(true)
.build()
itemView.draweeGif.controller = controller
For me it was a solution in my RecyclerView because I was looking to set the layoutParams directly in my ViewHolder.
Found a solution by extending SimpleDraweeView, it allows me to use wrap_content and it works just fine! How ever I prevent you from setting the size in setContentView and the preview is not working, I be glad if could edit this answer to fix those.
Usage
<com.gazman.WrapContentDraweeView
android:id="#+id/myImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
fresco:placeholderImage="#mipmap/myImage"/>
Source code
public class WrapContentDraweeView extends SimpleDraweeView {
private int outWidth;
private int outHeight;
public WrapContentDraweeView(Context context, GenericDraweeHierarchy hierarchy) {
super(context, hierarchy);
}
public WrapContentDraweeView(Context context) {
super(context);
}
public WrapContentDraweeView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs);
}
public WrapContentDraweeView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context, attrs);
}
public WrapContentDraweeView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
init(context, attrs);
}
private void init(Context context, AttributeSet attrs) {
if (attrs == null) {
return;
}
TypedArray gdhAttrs = context.obtainStyledAttributes(
attrs,
R.styleable.GenericDraweeView);
try {
int placeholderId = gdhAttrs.getResourceId(
R.styleable.GenericDraweeView_placeholderImage,
0);
if(placeholderId != 0){
if(isInEditMode()){
setImageResource(placeholderId);
}
else {
loadSize(placeholderId, context.getResources());
}
}
} finally {
gdhAttrs.recycle();
}
}
private void loadSize(int placeholderId, Resources resources) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(resources, placeholderId, options);
outWidth = options.outWidth;
outHeight = options.outHeight;
}
#Override
public void setLayoutParams(ViewGroup.LayoutParams params) {
params.width = outWidth;
params.height = outHeight;
super.setLayoutParams(params);
}
}
invoke updateWrapSize in onFinalImageSet
void updateWrapSize(#Nullable ImageInfo imageInfo) {
if (imageInfo != null) {
boolean wrapH = getLayoutParams().height == ViewGroup.LayoutParams.WRAP_CONTENT;
boolean wrapW = getLayoutParams().width == ViewGroup.LayoutParams.WRAP_CONTENT;
if (wrapH || wrapW) {
if (wrapW && !wrapH) {
getLayoutParams().width = (int) (imageInfo.getWidth() * (float) getLayoutParams().height / imageInfo.getHeight());
} else if (wrapH && !wrapW) {
getLayoutParams().height = (int) (imageInfo.getHeight() * (float) getLayoutParams().width / imageInfo.getWidth());
} else {
getLayoutParams().width = ViewGroup.LayoutParams.WRAP_CONTENT;
getLayoutParams().height = ViewGroup.LayoutParams.WRAP_CONTENT;
}
setAspectRatio((float) imageInfo.getWidth() / imageInfo.getHeight());
}
}
}
SOLVED: Solution below as answer.
I have a custom view with a TransitionDrawable and when I draw it in the onDraw() method it scales automatically to fill the whole parent layout, even when it's set in the xml to wrap_content. The picture is in mdpi and hdpi and my testing device (samsung galaxy s) I think it's no more than hdpi.
package com.adyrsoft.pronunciationtrainer;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.TransitionDrawable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
public class RecordButton extends View {
private static final String TAG = "RecordButton";
private TransitionDrawable mDrawable;
private boolean mActivated;
private OnClickListener mOnClickListenerInternal = new OnClickListener() {
#Override
public void onClick(View v) {
toggleState();
if(mOnClickListener != null) {
mOnClickListener.onClick(v);
}
}
};
private OnClickListener mOnClickListener = null;
public RecordButton(Context context) {
super(context);
init();
}
public RecordButton(Context context, AttributeSet attrib) {
super(context, attrib);
init();
}
public RecordButton(Context context, AttributeSet attrib, int defStyle) {
super(context, attrib, defStyle);
init();
}
public void setState(boolean activated) {
mActivated = activated;
if(mActivated){
mDrawable.startTransition(300);
}
else {
mDrawable.reverseTransition(300);
}
}
public void toggleState() {
if(mActivated) {
setState(false);
}
else {
setState(true);
}
}
#SuppressWarnings("deprecation")
private void init() {
mActivated = false;
mDrawable = (TransitionDrawable) getResources().getDrawable(R.drawable.btnrecord);
Log.d(TAG, "Drawable intrinsic width and height are: " +
Integer.toString(mDrawable.getIntrinsicWidth()) + " " +
Integer.toString(mDrawable.getIntrinsicHeight()));
mDrawable.setBounds(0,0,mDrawable.getIntrinsicWidth(), mDrawable.getIntrinsicHeight());
Log.d(TAG, "The bounds for the button are: "+mDrawable.getBounds().flattenToString());
super.setBackgroundDrawable(mDrawable);
setClickable(true);
super.setOnClickListener(mOnClickListenerInternal);
invalidate();
}
public void setOnClickListener(View.OnClickListener listener) {
mOnClickListener = listener;
}
protected void onDraw (Canvas canvas) {
super.onDraw(canvas);
}
}
What am I doing wrong?
Thanks.
After hours trying to understand how I should use the drawables in a custom view in order to be displayed in its original size, I've figured out how to do it.
First a few things that I didn't know but are a must is:
The background drawable should be left to the parent class to be
drawn when using View as the parent. If not, the TransitionDrawable can't be seen fading between pictures.
Only if I am going to draw on the background drawable I should override onDraw() and do the drawing there.
And the last but not less important is that I should override onMeasure() to specify the size of the view. If I don't do it, it will fill all the free space in the parent layout, as it was happening to me.
I've passed the TransitionDrawable to the parent class with setBackgroundDrawable() and since I wasn't drawing in the background drawable, I've removed the onDraw() method. Also I've implemented onMeasure() with a quick and dirty solution specifying the size of the picture I am drawing.
This is the final result:
public class RecordButton extends View {
private static final String TAG = "RecordButton";
private static final int DESIRED_WIDTH = 180;
private static final int DESIRED_HEIGHT = 66;
private TransitionDrawable mDrawable;
private Rect mViewRect;
private boolean mActivated;
private OnClickListener mOnClickListenerInternal = new OnClickListener() {
#Override
public void onClick(View v) {
toggleState();
if(mOnClickListener != null) {
mOnClickListener.onClick(v);
}
}
};
private OnClickListener mOnClickListener = null;
public RecordButton(Context context) {
this(context, null, 0);
}
public RecordButton(Context context, AttributeSet attrib) {
this(context, attrib, 0);
}
public RecordButton(Context context, AttributeSet attrib, int defStyle) {
super(context, attrib, defStyle);
init();
}
public void setState(boolean activated) {
mActivated = activated;
if(mActivated){
mDrawable.startTransition(300);
}
else {
mDrawable.reverseTransition(300);
}
}
public void toggleState() {
if(mActivated) {
setState(false);
}
else {
setState(true);
}
}
#SuppressWarnings("deprecation")
private void init() {
mActivated = false;
mDrawable = (TransitionDrawable) getResources().getDrawable(R.drawable.btnrecord);
setBackgroundDrawable(mDrawable);
setClickable(true);
super.setOnClickListener(mOnClickListenerInternal);
invalidate();
}
public void setOnClickListener(View.OnClickListener listener) {
mOnClickListener = listener;
}
#Override
protected void onMeasure(int m, int n) {
setMeasuredDimension(DESIRED_WIDTH, DESIRED_HEIGHT);
}
}