Android截屏截图的几种方法总结

　Android截屏

　　Android截屏的原理：获取具体需要截屏的区域的Bitmap，然后绘制在画布上，保存为图片后进行分享或者其它用途

一、Activity截屏

1、截Activity界面（包含空白的状态栏）

/**    * 根据指定的Activity截图（带空白的状态栏）    *    * @param context 要截图的Activity    * @return Bitmap    */   public static Bitmap shotActivity(Activity context) {     View view = context.getWindow().getDecorView();     view.setDrawingCacheEnabled(true);     view.buildDrawingCache();      Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache(), 0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());     view.setDrawingCacheEnabled(false);     view.destroyDrawingCache();     return bitmap;   }

2、截Activity界面（去除状态栏）

/**    * 根据指定的Activity截图（去除状态栏）    *    * @param activity 要截图的Activity    * @return Bitmap    */   public Bitmap shotActivityNoStatusBar(Activity activity) {     // 获取windows中最顶层的view     View view = activity.getWindow().getDecorView();     view.buildDrawingCache();      // 获取状态栏高度     Rect rect = new Rect();     view.getWindowVisibleDisplayFrame(rect);     int statusBarHeights = rect.top;     Display display = activity.getWindowManager().getDefaultDisplay();      // 获取屏幕宽和高     int widths = display.getWidth();     int heights = display.getHeight();      // 允许当前窗口保存缓存信息     view.setDrawingCacheEnabled(true);      // 去掉状态栏     Bitmap bmp = Bitmap.createBitmap(view.getDrawingCache(), 0,         statusBarHeights, widths, heights - statusBarHeights);      // 销毁缓存信息     view.destroyDrawingCache();      return bmp;   }

二、View截屏

/**  * 根据指定的view截图  *  * @param v 要截图的view  * @return Bitmap  */ public static Bitmap getViewBitmap(View v) {   if (null == v) {     return null;   }   v.setDrawingCacheEnabled(true);   v.buildDrawingCache();   if (Build.VERSION.SDK_INT >= 11) {     v.measure(View.MeasureSpec.makeMeasureSpec(v.getWidth(), View.MeasureSpec.EXACTLY),         View.MeasureSpec.makeMeasureSpec(v.getHeight(), View.MeasureSpec.EXACTLY));     v.layout((int) v.getX(), (int) v.getY(), (int) v.getX() + v.getMeasuredWidth(), (int) v.getY() + v.getMeasuredHeight());   } else {     v.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),         View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));     v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());   }    Bitmap bitmap = Bitmap.createBitmap(v.getDrawingCache(), 0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());   v.setDrawingCacheEnabled(false);   v.destroyDrawingCache();   return bitmap; }

三、ScrollView截屏：ScrollView只有一个childView，虽然没有全部显示在界面上，但是已经全部渲染绘制，因此可以直接调用scrollView.draw(canvas)来完成截图

/**  * Scrollview截屏  *  * @param scrollView 要截图的ScrollView  * @return Bitmap  */ public static Bitmap shotScrollView(ScrollView scrollView) {   int h = 0;   Bitmap bitmap = null;   for (int i = 0; i < scrollView.getChildCount(); i++) {     h += scrollView.getChildAt(i).getHeight();     scrollView.getChildAt(i).setBackgroundColor(Color.parseColor("#ffffff"));   }   bitmap = Bitmap.createBitmap(scrollView.getWidth(), h, Bitmap.Config.RGB_565);   final Canvas canvas = new Canvas(bitmap);   scrollView.draw(canvas);   return bitmap; }

四、ListView截屏：ListView是会回收与重用Item，并且只会绘制在屏幕上显示的ItemView，下面的方法采用一个List来存储Item的视图，这种方案依然不够好，当Item足够多的时候，可能会发生oom。

/**  * ListView截图  *  * @param listView 要截图的ListView  * @return Bitmap  */ public static Bitmap shotListView(ListView listView) {   ListAdapter adapter = listView.getAdapter();   int itemsCount = adapter.getCount();   int allItemsHeight = 0;    ArrayList bmps = new ArrayList<>();   for (int i = 0; i < itemsCount; i++) {     View childView = adapter.getView(i, null, listView);     childView.measure(View.MeasureSpec.makeMeasureSpec(listView.getWidth(),View.MeasureSpec.EXACTLY),         View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED));      childView.layout(0, 0, childView.getMeasuredWidth(), childView.getMeasuredHeight());     childView.setDrawingCacheEnabled(true);     childView.buildDrawingCache();     bmps.add(childView.getDrawingCache());     allItemsHeight += childView.getMeasuredHeight();   }    Bitmap bigBitmap = Bitmap.createBitmap(listView.getMeasuredWidth(), allItemsHeight, Bitmap.Config.ARGB_8888);   Canvas bigCanvas = new Canvas(bigBitmap);    Paint paint = new Paint();   int iHeight = 0;    for (int i = 0; i < bmps.size(); i++) {     Bitmap bmp = bmps.get(i);     bigCanvas.drawBitmap(bmp, 0, iHeight, paint);     iHeight += bmp.getHeight();      bmp.recycle();     bmp = null;   }   return bigBitmap; }

五、RecycleView截屏

/**    * RecyclerView截屏    *    * @param view 要截图的RecyclerView    * @return Bitmap    */   public static Bitmap shotRecyclerView(RecyclerView view) {     RecyclerView.Adapter adapter = view.getAdapter();     Bitmap bigBitmap = null;     if (adapter != null) {       int size = adapter.getItemCount();       int height = 0;       Paint paint = new Paint();       int iHeight = 0;       final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);        // Use 1/8th of the available memory for this memory cache.       final int cacheSize = maxMemory / 8;       LruCache bitmaCache = new LruCache<>(cacheSize);       for (int i = 0; i < size; i++) {         RecyclerView.ViewHolder holder = adapter.createViewHolder(view, adapter.getItemViewType(i));         adapter.onBindViewHolder(holder, i);         holder.itemView.measure(             View.MeasureSpec.makeMeasureSpec(view.getWidth(), View.MeasureSpec.EXACTLY),             View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));         holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(),             holder.itemView.getMeasuredHeight());         holder.itemView.setDrawingCacheEnabled(true);         holder.itemView.buildDrawingCache();         Bitmap drawingCache = holder.itemView.getDrawingCache();         if (drawingCache != null) {            bitmaCache.put(String.valueOf(i), drawingCache);         }         height += holder.itemView.getMeasuredHeight();       }        bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), height, Bitmap.Config.ARGB_8888);       Canvas bigCanvas = new Canvas(bigBitmap);       Drawable lBackground = view.getBackground();       if (lBackground instanceof ColorDrawable) {         ColorDrawable lColorDrawable = (ColorDrawable) lBackground;         int lColor = lColorDrawable.getColor();         bigCanvas.drawColor(lColor);       }        for (int i = 0; i < size; i++) {         Bitmap bitmap = bitmaCache.get(String.valueOf(i));         bigCanvas.drawBitmap(bitmap, 0f, iHeight, paint);         iHeight += bitmap.getHeight();         bitmap.recycle();       }     }     return bigBitmap;   }

六、WebView截屏

1、截取webView可视区域的截图

/**    * 截取webView可视区域的截图    * @param webView 前提：WebView要设置webView.setDrawingCacheEnabled(true);    * @return    */  private Bitmap captureWebViewVisibleSize(WebView webView){    Bitmap bmp = webView.getDrawingCache();    return bmp;  }

2、截取webView的整个页面

/**   * 截取webView快照(webView加载的整个内容的大小)   * @param webView   * @return   */  private Bitmap captureWebView(WebView webView){    Picture snapShot = webView.capturePicture();        Bitmap bmp = Bitmap.createBitmap(snapShot.getWidth(),snapShot.getHeight(), Bitmap.Config.ARGB_8888);    Canvas canvas = new Canvas(bmp);    snapShot.draw(canvas);    return bmp;  }

3、截取手机屏幕，获取界面展示的webview

/**  * 截屏  *  * @param context  * @return  */ private Bitmap captureScreen(Activity context) {   View cv = context.getWindow().getDecorView();   Bitmap bmp = Bitmap.createBitmap(cv.getWidth(), cv.getHeight(), Bitmap.Config.ARGB_8888);   Canvas canvas = new Canvas(bmp);   cv.draw(canvas);   return bmp; }

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