android.widget.ImageView.getViewTreeObserver()方法的使用及代码示例

x33g5p2x  于2022-01-20 转载在 其他  
字(9.5k)|赞(0)|评价(0)|浏览(120)

本文整理了Java中android.widget.ImageView.getViewTreeObserver()方法的一些代码示例，展示了ImageView.getViewTreeObserver()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。ImageView.getViewTreeObserver()方法的具体详情如下：
包路径：android.widget.ImageView
类名称：ImageView
方法名：getViewTreeObserver

ImageView.getViewTreeObserver介绍

暂无

代码示例

代码示例来源：origin: stackoverflow.com

int finalHeight, finalWidth;
final ImageView iv = (ImageView)findViewById(R.id.scaled_image);
final TextView tv = (TextView)findViewById(R.id.size_label);
ViewTreeObserver vto = iv.getViewTreeObserver();
vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
  public boolean onPreDraw() {
    iv.getViewTreeObserver().removeOnPreDrawListener(this);
    finalHeight = iv.getMeasuredHeight();
    finalWidth = iv.getMeasuredWidth();
    tv.setText("Height: " + finalHeight + " Width: " + finalWidth);
    return true;
  }
});

代码示例来源：origin: jaydenxiao2016/AndroidFire

@Override
  public void onGlobalLayout() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
      iv.getViewTreeObserver().removeOnGlobalLayoutListener(this);
    } else {
      iv.getViewTreeObserver().removeGlobalOnLayoutListener(this);
    }
    RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) iv.getLayoutParams();
    params.height = params.width;
    iv.setLayoutParams(params);
    iv.setScaleType(ImageView.ScaleType.CENTER_CROP);
  }
});

代码示例来源：origin: frogermcs/InstaMaterial

@Override
  public boolean onPreDraw() {
    ivPhoto.getViewTreeObserver().removeOnPreDrawListener(this);
    loadThumbnailPhoto();
    return true;
  }
});

代码示例来源：origin: jiangqqlmj/FastDev4Android

/**
 * 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 final void cleanup() {
  if (null != mImageView) {
    mImageView.get().getViewTreeObserver()
        .removeGlobalOnLayoutListener(this);
  }
  mViewTreeObserver = null;
  // Clear listeners too
  mMatrixChangeListener = null;
  mPhotoTapListener = null;
  mViewTapListener = null;
  // Finally, clear ImageView
  mImageView = null;
}

代码示例来源：origin: florent37/CameraFragment

public void into(final ImageView target) {
  ViewTreeObserver viewTreeObserver = target.getViewTreeObserver();
  viewTreeObserver.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
    public boolean onPreDraw() {
      target.getViewTreeObserver().removeOnPreDrawListener(this);
      new ImageLoaderThread(target, url).start();
      return true;
    }
  });
}

代码示例来源：origin: stackoverflow.com

int finalHeight, finalWidth;
final ImageView iv = (ImageView)findViewById(R.id.scaled_image);
final TextView tv = (TextView)findViewById(R.id.size_label);
ViewTreeObserver vto = iv.getViewTreeObserver();
vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
  public boolean onPreDraw() {
    // Remove after the first run so it doesn't fire forever
    iv.getViewTreeObserver().removeOnPreDrawListener(this);
    finalHeight = iv.getMeasuredHeight();
    finalWidth = iv.getMeasuredWidth();
    tv.setText("Height: " + finalHeight + " Width: " + finalWidth);
    return true;
  }
});

代码示例来源：origin: wangdan/AisenWeiBo

public PhotoViewAttacher(ImageView imageView) {
  mImageView = new WeakReference<ImageView>(imageView);
  mViewTreeObserver = imageView.getViewTreeObserver();
  mViewTreeObserver.addOnGlobalLayoutListener(this);
  // Make sure we using MATRIX Scale Type
  setImageViewScaleTypeMatrix(imageView);
  if (!imageView.isInEditMode()) {
    setZoomable(true);
  }
}

代码示例来源：origin: square/picasso

static ImageView mockFitImageViewTarget(boolean alive) {
 ViewTreeObserver observer = mock(ViewTreeObserver.class);
 when(observer.isAlive()).thenReturn(alive);
 ImageView mock = mock(ImageView.class);
 when(mock.getWindowToken()).thenReturn(mock(IBinder.class));
 when(mock.getViewTreeObserver()).thenReturn(observer);
 return mock;
}

代码示例来源：origin: square/picasso

void cancel() {
 creator.clearTag();
 callback = null;
 target.removeOnAttachStateChangeListener(this);
 ViewTreeObserver vto = target.getViewTreeObserver();
 if (vto.isAlive()) {
  vto.removeOnPreDrawListener(this);
 }
}

代码示例来源：origin: square/picasso

@Override public boolean onPreDraw() {
 ImageView target = this.target;
 ViewTreeObserver vto = target.getViewTreeObserver();
 if (!vto.isAlive()) {
  return true;
 }
 int width = target.getWidth();
 int height = target.getHeight();
 if (width <= 0 || height <= 0) {
  return true;
 }
 target.removeOnAttachStateChangeListener(this);
 vto.removeOnPreDrawListener(this);
 this.creator.unfit().resize(width, height).into(target, callback);
 return true;
}

代码示例来源：origin: square/picasso

@Test public void waitsForAnotherLayoutIfWidthOrHeightIsZero() {
 ImageView target = mockFitImageViewTarget(true);
 when(target.getWidth()).thenReturn(0);
 when(target.getHeight()).thenReturn(0);
 RequestCreator creator = mock(RequestCreator.class);
 DeferredRequestCreator request = new DeferredRequestCreator(creator, target, null);
 request.onPreDraw();
 verify(target.getViewTreeObserver(), never()).removeOnPreDrawListener(request);
 verifyZeroInteractions(creator);
}

代码示例来源：origin: florent37/CameraFragment

public boolean onPreDraw() {
    target.getViewTreeObserver().removeOnPreDrawListener(this);
    new ImageLoaderThread(target, url).start();
    return true;
  }
});

代码示例来源：origin: wangdan/AisenWeiBo

@Override
public boolean onPreDraw() {
  img.getViewTreeObserver().removeOnPreDrawListener(this);
  width = img.getWidth();
  ActivityHelper.putIntShareData(GlobalContext.getInstance(), "WallpaperWidth", width);
  onBindData(convertView, data, position);
  return true;
}

代码示例来源：origin: square/picasso

@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);
}

代码示例来源：origin: frogermcs/InstaMaterial

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_publish);
  toolbar.setNavigationIcon(R.drawable.ic_arrow_back_grey600_24dp);
  photoSize = getResources().getDimensionPixelSize(R.dimen.publish_photo_thumbnail_size);
  if (savedInstanceState == null) {
    photoUri = getIntent().getParcelableExtra(ARG_TAKEN_PHOTO_URI);
  } else {
    photoUri = savedInstanceState.getParcelable(ARG_TAKEN_PHOTO_URI);
  }
  updateStatusBarColor();
  ivPhoto.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
    @Override
    public boolean onPreDraw() {
      ivPhoto.getViewTreeObserver().removeOnPreDrawListener(this);
      loadThumbnailPhoto();
      return true;
    }
  });
}

代码示例来源：origin: square/picasso

@Test public void initWhileAttachedAddsAttachAndPreDrawListener() {
 ImageView target = mockFitImageViewTarget(true);
 ViewTreeObserver observer = target.getViewTreeObserver();
 DeferredRequestCreator request =
   new DeferredRequestCreator(mock(RequestCreator.class), target, null);
 verify(observer).addOnPreDrawListener(request);
}

代码示例来源：origin: square/picasso

@Test public void cancelSkipsIfViewTreeObserverIsDead() {
 ImageView target = mockFitImageViewTarget(false);
 RequestCreator creator = mock(RequestCreator.class);
 DeferredRequestCreator request = new DeferredRequestCreator(creator, target, null);
 request.cancel();
 verify(target.getViewTreeObserver(), never()).removeOnPreDrawListener(request);
}

代码示例来源：origin: square/picasso

@Test public void preDrawSubmitsRequestAndCleansUp() {
  Picasso picasso = mock(Picasso.class);
  when(picasso.transformRequest(any(Request.class))).thenAnswer(TRANSFORM_REQUEST_ANSWER);

  RequestCreator creator = new RequestCreator(picasso, URI_1, 0);

  ImageView target = mockFitImageViewTarget(true);
  when(target.getWidth()).thenReturn(100);
  when(target.getHeight()).thenReturn(100);

  ViewTreeObserver observer = target.getViewTreeObserver();

  DeferredRequestCreator request = new DeferredRequestCreator(creator, target, null);
  request.onPreDraw();

  verify(observer).removeOnPreDrawListener(request);
  verify(picasso).enqueueAndSubmit(actionCaptor.capture());

  Action value = actionCaptor.getValue();
  assertThat(value).isInstanceOf(ImageViewAction.class);
  assertThat(value.request.targetWidth).isEqualTo(100);
  assertThat(value.request.targetHeight).isEqualTo(100);
 }
}

代码示例来源：origin: square/picasso

@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);
}

代码示例来源：origin: alexvasilkov/GestureViews

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.image_cross_animation_from_screen);
  getSupportActionBarNotNull().setDisplayHomeAsUpEnabled(true);
  image = findViewById(R.id.single_image_from);
  // Loading image
  Painting painting = Painting.list(getResources())[PAINTING_ID];
  GlideHelper.loadThumb(image, painting.thumbId);
  // Setting image click listener
  image.setOnClickListener(this::showFullImage);
  // Image position may change (e.g. when screen orientation is changed), so we should update
  // fullscreen image to ensure exit animation will return image into correct position.
  image.getViewTreeObserver().addOnGlobalLayoutListener(this::onLayoutChanges);
}

内容来源于网络，如有侵权，请联系作者删除！

ImageView

相关文章

    查看更多

    热门标签

    更多
    JavaquerypythonNode开发语言requestUtil数据库Table后端算法LoggerMessageElementParser

    最新文章

    更多

    ImageView类方法

    • 蜀ICP备2022004421号-2 NULL123 https://www.null123.com © All rights reserved
    • 本站内容来源互联网,如果侵犯您的权益请联系我们删除, 联系方式：448109455@qq.com