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Andriod 获取屏幕/控件宽高

2019-11-09 16:25:54
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// 获取屏幕宽高// 获取屏幕宽高(方法1)  int screenWidth = getWindowManager().getDefaultDisplay().getWidth(); // 屏幕宽(像素,如:480px)  int screenHeight = getWindowManager().getDefaultDisplay().getHeight(); // 屏幕高(像素,如:800p)  Log.e(TAG + " getDefaultDisplay", "screenWidth=" + screenWidth + "; screenHeight=" + screenHeight);  // 获取屏幕密度(方法2)  DisplayMetrics dm = new DisplayMetrics();  dm = getResources().getDisplayMetrics();  float density = dm.density; // 屏幕密度(像素比例:0.75/1.0/1.5/2.0)  int densityDPI = dm.densityDpi; // 屏幕密度(每寸像素:120/160/240/320)  float xdpi = dm.xdpi;  float ydpi = dm.ydpi;  Log.e(TAG + " DisplayMetrics", "xdpi=" + xdpi + "; ydpi=" + ydpi);  Log.e(TAG + " DisplayMetrics", "density=" + density + "; densityDPI=" + densityDPI);  screenWidth = dm.widthPixels; // 屏幕宽(像素,如:480px)  screenHeight = dm.heightPixels; // 屏幕高(像素,如:800px)  Log.e(TAG + " DisplayMetrics(111)", "screenWidth=" + screenWidth + "; screenHeight=" + screenHeight);  // 获取屏幕密度(方法3)  dm = new DisplayMetrics();  getWindowManager().getDefaultDisplay().getMetrics(dm);  density = dm.density; // 屏幕密度(像素比例:0.75/1.0/1.5/2.0)  densityDPI = dm.densityDpi; // 屏幕密度(每寸像素:120/160/240/320)  xdpi = dm.xdpi;  ydpi = dm.ydpi;  Log.e(TAG + " DisplayMetrics", "xdpi=" + xdpi + "; ydpi=" + ydpi);  Log.e(TAG + " DisplayMetrics", "density=" + density + "; densityDPI=" + densityDPI);  int screenWidthDip = dm.widthPixels; // 屏幕宽(dip,如:320dip)  int screenHeightDip = dm.heightPixels; // 屏幕宽(dip,如:533dip)  Log.e(TAG + " DisplayMetrics(222)", "screenWidthDip=" + screenWidthDip + "; screenHeightDip=" + screenHeightDip);  screenWidth = (int)(dm.widthPixels * density + 0.5f); // 屏幕宽(px,如:480px)  screenHeight = (int)(dm.heightPixels * density + 0.5f); // 屏幕高(px,如:800px)  Log.e(TAG + " DisplayMetrics(222)", "screenWidth=" + screenWidth + "; screenHeight=" + screenHeight);    // 获取控件宽高

//------------------------------------------------方法一          int w = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);          int h = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);          imageView.measure(w, h);          int height =imageView.getMeasuredHeight();          int width =imageView.getMeasuredWidth();          textView.append("/n"+height+","+width);                此方法会加载onMeasure三次                                //-----------------------------------------------方法二          ViewTreeObserver vto = imageView.getViewTreeObserver();          vto.addOnPReDrawListener(new ViewTreeObserver.OnPreDrawListener() {              public boolean onPreDraw() {                  int height = imageView.getMeasuredHeight();                  int width = imageView.getMeasuredWidth();                  textView.append("/n"+height+","+width);                  return true;              }          });        此方法会加载onMeasure二次,但是回调函数会回调很多次         //-----------------------------------------------方法三             ViewTreeObserver vto2 = imageView.getViewTreeObserver();            vto2.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {              @Override                public void onGlobalLayout() {                  imageView.getViewTreeObserver().removeGlobalOnLayoutListener(this);                    textView.append("/n/n"+imageView.getHeight()+","+imageView.getWidth());              }            });          <pre name="code" class="csharp">   此方法会加载onMeasure二次,但是回调函数只回调一次</pre><p></p>  <pre></pre>  <br>  <br>  <p></p> 
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