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<bitmap> 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<string, bitmap> 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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