第一种:(重写Activity的onWindowFocusChanged方法)

/** * 重写Acitivty的onWindowFocusChanged方法 */ @Overridepublic void onWindowFocusChanged(boolean hasFocus) {super.onWindowFocusChanged(hasFocus);/** * 当hasFocus为true的时候，说明Activity的Window对象已经获取焦点，进而Activity界面已经加载绘制完成 */if (hasFocus) {int widht = titleText.getWidth();int height = titleText.getHeight();Log.i(TAG, "onWindowFocusChanged width:" + widht + " "+ " height:" + height;}}

第二种:(为组件添加OnGlobalLayoutListener事件监听)

/** * 为Activity的布局文件添加OnGlobalLayoutListener事件监听，当回调到onGlobalLayout方法的时候我们通过getMeasureHeight和getMeasuredWidth方法可以获取到组件的宽和高 */private void initOnLayoutListener() {final ViewTreeObserver viewTreeObserver = this.getWindow().getDecorView().getViewTreeObserver();viewTreeObserver.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {@Overridepublic void onGlobalLayout() {Log.i(TAG, "开始执行onGlobalLayout().........");int height = titleText.getMeasuredHeight();int width = titleText.getMeasuredWidth();Log.i(TAG, "height:" + height + " width:" + width); // 移除GlobalLayoutListener监听  MainActivity.this.getWindow().getDecorView().getViewTreeObserver().removeOnGlobalLayoutListener(this);}});}

第三种:(为组件添加OnPreDrawListener事件监听)

/** * 初始化viewTreeObserver事件监听,重写OnPreDrawListener获取组件高度 */private void initOnPreDrawListener() {final ViewTreeObserver viewTreeObserver = this.getWindow().getDecorView().getViewTreeObserver();viewTreeObserver.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {@Overridepublic boolean onPreDraw() {Log.i(TAG, "开始执行onPreDraw().........");int height = titleText.getMeasuredHeight();int width = titleText.getMeasuredWidth();Log.i(TAG, "height:" + height + " width:" + width);// 移除OnPreDrawListener事件监听MainActivity.this.getWindow().getDecorView().getViewTreeObserver().removeOnPreDrawListener(this);return true;}});}

第四种:(使用View.post方法获取组件的宽高)

/** * 使用View的post方法获取组件的宽度和高度 */private void initViewHandler() {titleText.post(new Runnable() {@Overridepublic void run() {int width = titleText.getWidth();int height = titleText.getHeight();Log.i(TAG, "initViewHandler height:" + height + " width:" + width);}});}

第五种:(通过Handler对象使用异步消息获取组件的宽高)

/** * 在onCreate方法中发送异步消息，在handleMessage中获取组件的宽高 */private Handler mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {if (msg.what == 101) {int width = titleText.getWidth();int height = titleText.getHeight();Log.i(TAG, "initViewHandler height:" + height + " width:" + width);}}};

总结：

  • 第一种重写onWidnowFocusChanged方法获取组件宽高的方式，方法可能会执行多次，这点需要我们注意
  • 本人在实际开发中使用第二种较多