下面列出了android.widget.ImageView#getViewTreeObserver ( ) 实例代码,或者点击链接到github查看源代码,也可以在右侧发表评论。
@Override
public boolean onPreDraw() {
ImageView target = this.target.get();
if (target == null) {
return true;
}
ViewTreeObserver vto = target.getViewTreeObserver();
if (!vto.isAlive()) {
return true;
}
int width = target.getWidth();
int height = target.getHeight();
if (width <= 0 || height <= 0) {
return true;
}
vto.removeOnPreDrawListener(this);
this.creator.unfit().resize(width, height).into(target, callback);
return true;
}
@Override
public boolean onPreDraw() {
ImageView target = this.target.get();
if (target == null) {
return true;
}
ViewTreeObserver vto = target.getViewTreeObserver();
if (!vto.isAlive()) {
return true;
}
int width = target.getWidth();
int height = target.getHeight();
if (width <= 0 || height <= 0) {
return true;
}
vto.removeOnPreDrawListener(this);
this.creator.unfit().resize(width, height).into(target, callback);
return true;
}
@Test public void initWhileDetachedAddsAttachListenerWhichDefersPreDrawListener() {
ImageView target = mockFitImageViewTarget(true);
when(target.getWindowToken()).thenReturn(null);
ViewTreeObserver observer = target.getViewTreeObserver();
DeferredRequestCreator request =
new DeferredRequestCreator(mock(RequestCreator.class), target, null);
verify(target).addOnAttachStateChangeListener(request);
verifyNoMoreInteractions(observer);
// Attach and ensure we defer to the pre-draw listener.
request.onViewAttachedToWindow(target);
verify(observer).addOnPreDrawListener(request);
// Detach and ensure we remove the pre-draw listener from the original VTO.
request.onViewDetachedFromWindow(target);
verify(observer).removeOnPreDrawListener(request);
}
/**
* Clean-up the resources attached to this object. This needs to be called
* when the ImageView is no longer used. A good example is from
* {@link android.view.View#onDetachedFromWindow()} or from
* {@link android.app.Activity#onDestroy()}. This is automatically called if
* you are using {@link com.antonioleiva.materialeverywhere.uk.co.senab.photoview.PhotoView}.
*/
@SuppressWarnings("deprecation")
public final void cleanup() {
if (null == mImageView) {
return; // cleanup already done
}
final ImageView imageView = mImageView.get();
if (null != imageView) {
// Remove this as a global layout listener
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer && observer.isAlive()) {
observer.removeGlobalOnLayoutListener(this);
}
// Remove the ImageView's reference to this
imageView.setOnTouchListener(null);
// make sure a pending fling runnable won't be run
cancelFling();
}
if (null != mGestureDetector) {
mGestureDetector.setOnDoubleTapListener(null);
}
// Clear listeners too
mMatrixChangeListener = null;
mPhotoTapListener = null;
mViewTapListener = null;
// Finally, clear ImageView
mImageView = null;
}
public PhotoViewAttacher(ImageView imageView, boolean zoomable) {
mImageView = new WeakReference<>(imageView);
imageView.setDrawingCacheEnabled(true);
imageView.setOnTouchListener(this);
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer)
observer.addOnGlobalLayoutListener(this);
// Make sure we using MATRIX Scale Type
setImageViewScaleTypeMatrix(imageView);
if (imageView.isInEditMode()) {
return;
}
// Create Gesture Detectors...
mScaleDragDetector = VersionedGestureDetector.newInstance(
imageView.getContext(), this);
mGestureDetector = new GestureDetector(imageView.getContext(),
new GestureDetector.SimpleOnGestureListener() {
// forward long click listener
@Override
public void onLongPress(MotionEvent e) {
if (null != mLongClickListener) {
mLongClickListener.onLongClick(getImageView());
}
}
});
mGestureDetector.setOnDoubleTapListener(new DefaultOnDoubleTapListener(this));
// Finally, update the UI so that we're zoomable
setZoomable(zoomable);
}
void cancel() {
callback = null;
ImageView target = this.target.get();
if (target == null) {
return;
}
ViewTreeObserver vto = target.getViewTreeObserver();
if (!vto.isAlive()) {
return;
}
vto.removeOnPreDrawListener(this);
}
/**
* Clean-up the resources attached to this object. This needs to be called
* when the ImageView is no longer used. A good example is from
* {@link android.view.View#onDetachedFromWindow()} or from
* {@link android.app.Activity#onDestroy()}. This is automatically called if
* you are using {@link com.antonioleiva.materialeverywhere.uk.co.senab.photoview.PhotoView}.
*/
@SuppressWarnings("deprecation")
public final void cleanup() {
if (null == mImageView) {
return; // cleanup already done
}
final ImageView imageView = mImageView.get();
if (null != imageView) {
// Remove this as a global layout listener
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer && observer.isAlive()) {
observer.removeGlobalOnLayoutListener(this);
}
// Remove the ImageView's reference to this
imageView.setOnTouchListener(null);
// make sure a pending fling runnable won't be run
cancelFling();
}
if (null != mGestureDetector) {
mGestureDetector.setOnDoubleTapListener(null);
}
// Clear listeners too
mMatrixChangeListener = null;
mPhotoTapListener = null;
mViewTapListener = null;
// Finally, clear ImageView
mImageView = null;
}
public PhotoViewAttacher(ImageView imageView) {
mImageView = new WeakReference<ImageView>(imageView);
imageView.setDrawingCacheEnabled(true);
imageView.setOnTouchListener(this);
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer)
observer.addOnGlobalLayoutListener(this);
// Make sure we using MATRIX Scale Type
setImageViewScaleTypeMatrix(imageView);
if (imageView.isInEditMode()) {
return;
}
// Create Gesture Detectors...
mScaleDragDetector = VersionedGestureDetector.newInstance(
imageView.getContext(), this);
mGestureDetector = new GestureDetector(imageView.getContext(),
new GestureDetector.SimpleOnGestureListener() {
// forward long click listener
@Override
public void onLongPress(MotionEvent e) {
if (null != mLongClickListener) {
mLongClickListener.onLongClick(getImageView());
}
}
});
mGestureDetector.setOnDoubleTapListener(new DefaultOnDoubleTapListener(this));
// Finally, update the UI so that we're zoomable
setZoomable(true);
}
@Test public void onLayoutSkipsIfViewIsAttachedAndViewTreeObserverIsDead() {
ImageView target = mockFitImageViewTarget(false);
RequestCreator creator = mock(RequestCreator.class);
DeferredRequestCreator request = new DeferredRequestCreator(creator, target, null);
ViewTreeObserver viewTreeObserver = target.getViewTreeObserver();
request.onPreDraw();
verify(viewTreeObserver).addOnPreDrawListener(request);
verify(viewTreeObserver).isAlive();
verifyNoMoreInteractions(viewTreeObserver);
verifyZeroInteractions(creator);
}
public PhotoViewAttacher(ImageView imageView) {
mImageView = new WeakReference<ImageView>(imageView);
imageView.setOnTouchListener(this);
mViewTreeObserver = imageView.getViewTreeObserver();
mViewTreeObserver.addOnGlobalLayoutListener(this);
// Make sure we using MATRIX Scale Type
setImageViewScaleTypeMatrix(imageView);
if (!imageView.isInEditMode()) {
// Create Gesture Detectors...
mScaleDragDetector = VersionedGestureDetector.newInstance(imageView.getContext(), this);
mGestureDetector = new GestureDetector(imageView.getContext(),
new GestureDetector.SimpleOnGestureListener() {
// forward long click listener
@Override
public void onLongPress(MotionEvent e) {
if (null != mLongClickListener) {
mLongClickListener.onLongClick(mImageView.get());
}
}
});
mGestureDetector.setOnDoubleTapListener(this);
// Finally, update the UI so that we're zoomable
setZoomable(true);
}
}
/**
* Clean-up the resources attached to this object. This needs to be called when the ImageView is
* no longer used. A good example is from {@link View#onDetachedFromWindow()} or
* from {@link android.app.Activity#onDestroy()}. This is automatically called if you are using
* {@link cn.finalteam.galleryfinal.widget.zoonview.PhotoView}.
*/
@SuppressWarnings("deprecation")
public void cleanup() {
if (null == mImageView) {
return; // cleanup already done
}
final ImageView imageView = mImageView.get();
if (null != imageView) {
// Remove this as a global layout listener
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer && observer.isAlive()) {
observer.removeGlobalOnLayoutListener(this);
}
// Remove the ImageView's reference to this
imageView.setOnTouchListener(null);
// make sure a pending fling runnable won't be run
cancelFling();
}
if (null != mGestureDetector) {
mGestureDetector.setOnDoubleTapListener(null);
}
// Clear listeners too
mMatrixChangeListener = null;
mPhotoTapListener = null;
mViewTapListener = null;
// Finally, clear ImageView
mImageView = null;
}
public ImageViewScaler(ImageView imageView, boolean zoomable) {
mImageView = new WeakReference<>(imageView);
imageView.setDrawingCacheEnabled(true);
imageView.setOnTouchListener(this);
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer)
observer.addOnGlobalLayoutListener(this);
// Make sure we using MATRIX Scale Type
setImageViewScaleTypeMatrix(imageView);
if (imageView.isInEditMode()) {
return;
}
// Create Gesture Detectors...
mScaleDragDetector = VersionedGestureDetector.newInstance(
imageView.getContext(), this);
mGestureDetector = new GestureDetector(imageView.getContext(),
new GestureDetector.SimpleOnGestureListener() {
// forward long click listener
@Override
public void onLongPress(MotionEvent e) {
if (null != mLongClickListener) {
mLongClickListener.onLongClick(getImageView());
}
}
});
mGestureDetector.setOnDoubleTapListener(new DefaultOnDoubleTapListener(this));
// Finally, update the UI so that we're zoomable
setZoomable(zoomable);
}
/**
* Clean-up the resources attached to this object. This needs to be called when the ImageView is
* no longer used. A good example is from {@link View#onDetachedFromWindow()} or
* from {@link android.app.Activity#onDestroy()}.
*/
@SuppressWarnings("deprecation")
public void cleanup() {
if (null == mImageView) {
return; // cleanup already done
}
final ImageView imageView = mImageView.get();
if (null != imageView) {
// Remove this as a global layout listener
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer && observer.isAlive()) {
observer.removeGlobalOnLayoutListener(this);
}
// Remove the ImageView's reference to this
imageView.setOnTouchListener(null);
// make sure a pending fling runnable won't be run
cancelFling();
}
if (null != mGestureDetector) {
mGestureDetector.setOnDoubleTapListener(null);
}
// Clear listeners too
mMatrixChangeListener = null;
mPhotoTapListener = null;
mViewTapListener = null;
// Finally, clear ImageView
mImageView = null;
}
public PhotoViewAttacher(ImageView imageView) {
mImageView = new WeakReference<ImageView>(imageView);
imageView.setDrawingCacheEnabled(true);
imageView.setOnTouchListener(this);
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer)
observer.addOnGlobalLayoutListener(this);
// Make sure we using MATRIX Scale Type
setImageViewScaleTypeMatrix(imageView);
if (imageView.isInEditMode()) {
return;
}
// Create Gesture Detectors...
mScaleDragDetector = VersionedGestureDetector.newInstance(
imageView.getContext(), this);
mGestureDetector = new GestureDetector(imageView.getContext(),
new GestureDetector.SimpleOnGestureListener() {
// forward long click listener
@Override
public void onLongPress(MotionEvent e) {
if (null != mLongClickListener) {
mLongClickListener.onLongClick(getImageView());
}
}
});
mGestureDetector.setOnDoubleTapListener(new DefaultOnDoubleTapListener(this));
// Finally, update the UI so that we're zoomable
setZoomable(true);
}
public PhotoViewAttacher(ImageView imageView) {
mImageView = new WeakReference<ImageView>(imageView);
imageView.setOnTouchListener(this);
mViewTreeObserver = imageView.getViewTreeObserver();
mViewTreeObserver.addOnGlobalLayoutListener(this);
// Make sure we using MATRIX Scale Type
setImageViewScaleTypeMatrix(imageView);
if (!imageView.isInEditMode()) {
// Create Gesture Detectors...
mScaleDragDetector = VersionedGestureDetector.newInstance(imageView.getContext(), this);
mGestureDetector = new GestureDetector(imageView.getContext(),
new GestureDetector.SimpleOnGestureListener() {
// forward long click listener
@Override
public void onLongPress(MotionEvent e) {
if (null != mLongClickListener) {
mLongClickListener.onLongClick(mImageView.get());
}
}
});
mGestureDetector.setOnDoubleTapListener(this);
// Finally, update the UI so that we're zoomable
setZoomable(true);
}
}
/**
* Clean-up the resources attached to this object. This needs to be called when the ImageView is
* no longer used. A good example is from {@link android.view.View#onDetachedFromWindow()} or
* from {@link android.app.Activity#onDestroy()}. This is automatically called if you are using
* {@link com.marshalchen.common.uimodule.photoview.PhotoView}.
*/
@SuppressWarnings("deprecation")
public void cleanup() {
if (null == mImageView) {
return; // cleanup already done
}
final ImageView imageView = mImageView.get();
if (null != imageView) {
// Remove this as a global layout listener
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer && observer.isAlive()) {
observer.removeGlobalOnLayoutListener(this);
}
// Remove the ImageView's reference to this
imageView.setOnTouchListener(null);
// make sure a pending fling runnable won't be run
cancelFling();
}
if (null != mGestureDetector) {
mGestureDetector.setOnDoubleTapListener(null);
}
// Clear listeners too
mMatrixChangeListener = null;
mPhotoTapListener = null;
mViewTapListener = null;
// Finally, clear ImageView
mImageView = null;
}
public PhotoViewAttacher(ImageView imageView) {
mImageView = new WeakReference<ImageView>(imageView);
imageView.setOnTouchListener(this);
mViewTreeObserver = imageView.getViewTreeObserver();
mViewTreeObserver.addOnGlobalLayoutListener(this);
// Make sure we using MATRIX Scale Type
setImageViewScaleTypeMatrix(imageView);
if (!imageView.isInEditMode()) {
// Create Gesture Detectors...
mScaleDragDetector = VersionedGestureDetector.newInstance(imageView.getContext(), this);
mGestureDetector = new GestureDetector(imageView.getContext(),
new GestureDetector.SimpleOnGestureListener() {
// forward long click listener
@Override
public void onLongPress(MotionEvent e) {
if (null != mLongClickListener) {
mLongClickListener.onLongClick(mImageView.get());
}
}
});
mGestureDetector.setOnDoubleTapListener(this);
// Finally, update the UI so that we're zoomable
setZoomable(true);
}
}
/**
* Clean-up the resources attached to this object. This needs to be called when the ImageView is
* no longer used. A good example is from {@link View#onDetachedFromWindow()} or
* from {@link android.app.Activity#onDestroy()}. This is automatically called if you are using
* {@link uk.co.senab.photoview.PhotoView}.
*/
@SuppressWarnings("deprecation")
public void cleanup() {
if (null == mImageView) {
return; // cleanup already done
}
final ImageView imageView = mImageView.get();
if (null != imageView) {
// Remove this as a global layout listener
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer && observer.isAlive()) {
observer.removeGlobalOnLayoutListener(this);
}
// Remove the ImageView's reference to this
imageView.setOnTouchListener(null);
// make sure a pending fling runnable won't be run
cancelFling();
}
if (null != mGestureDetector) {
mGestureDetector.setOnDoubleTapListener(null);
}
// Clear listeners too
mMatrixChangeListener = null;
mPhotoTapListener = null;
mViewTapListener = null;
// Finally, clear ImageView
mImageView = null;
}
/**
* Clean-up the resources attached to this object. This needs to be called when the ImageView is
* no longer used. A good example is from {@link android.view.View#onDetachedFromWindow()} or
* from {@link android.app.Activity#onDestroy()}. This is automatically called if you are using
* {@link uk.co.senab.photoview.PhotoView}.
*/
@SuppressWarnings("deprecation")
public void cleanup() {
if (null == mImageView) {
return; // cleanup already done
}
final ImageView imageView = mImageView.get();
if (null != imageView) {
// Remove this as a global layout listener
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer && observer.isAlive()) {
observer.removeGlobalOnLayoutListener(this);
}
// Remove the ImageView's reference to this
imageView.setOnTouchListener(null);
// make sure a pending fling runnable won't be run
cancelFling();
}
if (null != mGestureDetector) {
mGestureDetector.setOnDoubleTapListener(null);
}
// Clear listeners too
mMatrixChangeListener = null;
mPhotoTapListener = null;
mViewTapListener = null;
// Finally, clear ImageView
mImageView = null;
}
private PhotoViewAttacher(ImageView imageView, boolean zoomable) {
mImageView = new WeakReference<>(imageView);
imageView.setDrawingCacheEnabled(true);
imageView.setOnTouchListener(this);
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer)
observer.addOnGlobalLayoutListener(this);
// Make sure we using MATRIX Scale Type
setImageViewScaleTypeMatrix(imageView);
if (imageView.isInEditMode()) {
return;
}
// Create Gesture Detectors...
mScaleDragDetector = VersionedGestureDetector.newInstance(
imageView.getContext(), this);
mGestureDetector = new GestureDetector(imageView.getContext(),
new GestureDetector.SimpleOnGestureListener() {
// forward long click listener
@Override
public void onLongPress(MotionEvent e) {
if (null != mLongClickListener) {
mLongClickListener.onLongClick(getImageView());
}
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2,
float velocityX, float velocityY) {
if (mSingleFlingListener != null) {
if (getScale() > DEFAULT_MIN_SCALE) {
return false;
}
if (MotionEventCompat.getPointerCount(e1) > SINGLE_TOUCH
|| MotionEventCompat.getPointerCount(e2) > SINGLE_TOUCH) {
return false;
}
return mSingleFlingListener.onFling(e1, e2, velocityX, velocityY);
}
return false;
}
});
mGestureDetector.setOnDoubleTapListener(new DefaultOnDoubleTapListener(this));
mBaseRotation = 0.0f;
// Finally, update the UI so that we're zoomable
setZoomable(zoomable);
}