Android截屏分享功能

最近项目需要实现Android截屏分享功能，包括Android截屏获取图片、将图片保存到本地、通知系统相册更新、通过微信、QQ、微博分享截屏图片，本篇文章作为总结回顾。

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一、Android截屏获取图片

通过对view进行绘制，得到bitmap，可以对Activity、Fragment进行绘制，也可以对其他的View进行绘制。

1 Activity截图（带空白的状态栏）

public Bitmap shotScreen(Activity activity) { 
 View view = activity.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 Activity截图（去掉状态栏）

public Bitmap shotActivityNoBar(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; 
}

3 Fragment截图

public Bitmap getFragmentBitmap(Fragment fragment) { 
 View v = fragment.getView(); 
 v.buildDrawingCache(false); 
 return v.getDrawingCache(); 
}

绘制View的方式只适用于静态View，SurfaceView、IjkVideoView等播放视频的View，不能截取到；此外，某些动画类View也不能截取到。针对上述情况，可获取SurfaceView的一帧生成bitmap，将bitmap进行合并，同理动画类View也可以合并。例如，最底层播放视频、中间层播放动画、最上层是普通的view，可将bitmap合并，如下：

public Bitmap combineBitmapInCenter(Bitmap background, Bitmap midBitmap, Bitmap foreground) { 
  if (!background.isMutable()) { 
   background = background.copy(Bitmap.Config.ARGB_8888, true); 
  } 
  Paint paint = new Paint(); 
  Canvas canvas = new Canvas(background); 
  int bw = background.getWidth(); 
  int bh = background.getHeight(); 
  int mw = midBitmap.getWidth(); 
  int mh = midBitmap.getHeight(); 
  int mx = (mw - bw) / 2; 
  int my = (mh - bh) / 2; 
  canvas.drawBitmap(midBitmap, mx, my, paint); 
  int fw = foreground.getWidth(); 
  int fh = foreground.getHeight(); 
  int fx = (fw - bw) / 2; 
  int fy = (fh - bh) / 2; 
  canvas.drawBitmap(foreground, fx, fy, paint); 
  canvas.save(Canvas.ALL_SAVE_FLAG); 
  canvas.restore(); 
  return background; 
}

需要注意：view的绘制必须在UI线程完成，否则会crash；bitmap的合并会较耗时，需在子线程完成。

二、将bitmap保存在本地

public void saveBitmapToFile(String fileName, Bitmap bitmap) { 
  if (TextUtils.isEmpty(fileName) || bitmap == null) return; 
  try { 
   File f = new File(fileName); 
   f.createNewFile(); 
   FileOutputStream fOut = new FileOutputStream(f); 
   bitmap.compress(Bitmap.CompressFormat.JPEG, 80, fOut); 
   fOut.flush(); 
   fOut.close(); 
  } catch (FileNotFoundException e) { 
   Log.i("ScreenShotUtil", "保存失败"); 
   e.printStackTrace(); 
  } catch (IOException e) { 
   e.printStackTrace(); 
  } 
}

三、通知系统相册更新

public void AlbumScan(String fileName) { 
  MediaScannerConnection.scanFile(mActivity.getApplicationContext(), new String[]{fileName}, new String[]{"image/jpeg"}, null); 
}

四、通过微信、QQ、微博分享

通过微信、QQ、微博分享的sdk实现，如下：

1 分享到微信朋友圈

public void shareToWexinCircle() { 
  if (iShareService.isWeixinInstalled()) {//判断微信是否安装 
   Bitmap mWXShareBitmap = mLatesBitmap;//将截屏得到的bitmap赋值 
   WXImageObject imgObject = new WXImageObject(mWXShareBitmap); 
   WXMediaMessage mediaMessage = new WXMediaMessage(); 
   mediaMessage.mediaObject = imgObject; 
   Log.i(TAG,"mediaMessage.mediaObject = imgObject"); 
   //设置缩略图 
   Bitmap thumbBmp = Bitmap.createScaledBitmap(mWXShareBitmap,50,80,true); 
   mediaMessage.thumbData = bmpToByteArray(thumbBmp,true); 
   Log.i(TAG,"设置缩略图"); 
   //request to wx 
   SendMessageToWX.Req req = new SendMessageToWX.Req(); 
   req.transaction = buildTransaction("img");//分享类型是图片 
   req.message = mediaMessage; 
   req.scene = SendMessageToWX.Req.WXSceneTimeline;//分享到朋友圈 
   Log.i(TAG,"request to wx"); 
   IWXAPI api = WXAPIFactory.createWXAPI(mActivity,"微信分享id",true); 
   api.registerApp("微信分享id"); 
   boolean result = api.sendReq(req); 
   Log.i(TAG,"share to circle:"+result); 
  } else { 
   ToastUtils.show(mActivity, "您没有安装微信客户端"); 
  } 
} 

public byte[] bmpToByteArray(final Bitmap bmp, final boolean needRecycle) { 
  ByteArrayOutputStream output = new ByteArrayOutputStream(); 
  bmp.compress(Bitmap.CompressFormat.PNG, 100, output); 
  if (needRecycle) { 
   bmp.recycle(); 
  } 
  byte[] result = output.toByteArray(); 
  try { 
   output.close(); 
  } catch (Exception e) { 
   e.printStackTrace(); 
  } 
  return result; 
} 

private String buildTransaction(final String type) { 
  return (type == null) ? String.valueOf(System.currentTimeMillis()) : type + System.currentTimeMillis(); 
}

2、分享到微信好友

 
 public void shareWexinFriend() { 
  if (iShareService.isWeixinInstalled()) { 
   mWXShareBitmap = mLatesBitmap; 
   WXImageObject imgObject = new WXImageObject(mWXShareBitmap); 
   WXMediaMessage mediaMessage = new WXMediaMessage(); 
   mediaMessage.mediaObject = imgObject; 
   //设置缩略图 
   Bitmap thumbBmp = Bitmap.createScaledBitmap(mWXShareBitmap,50,80,true); 
   mediaMessage.thumbData = bmpToByteArray(thumbBmp,true); 
   //request to wx 
   SendMessageToWX.Req req = new SendMessageToWX.Req(); 
   req.transaction =buildTransaction("img"); 
   req.message = mediaMessage; 
   req.scene = SendMessageToWX.Req.WXSceneSession; 
   IWXAPI api = WXAPIFactory.createWXAPI(mActivity,"微信分享id",true); 
   api.registerApp("微信分享id"); 
   boolean result = api.sendReq(req); 
   Log.i(TAG,"share to weixin:"+result ); 
  } else { 
   ToastUtils.show(mActivity, "您没有安装微信客户端"); 
  } 
} 
3、分享到QQ好友 
 public void shareToQQFriend() { 
  if (iShareService.isQQInstalled()) {//判断QQ是否安装 
   Tencent tencent = Tencent.createInstance("qq id", mActivity); 
   Bundle params = new Bundle(); 
   params.putString(QQShare.SHARE_TO_QQ_IMAGE_LOCAL_URL, mLatestImagePath);//QQ分享只能分享本地图片，传入本地图片路径 
   params.putInt(QQShare.SHARE_TO_QQ_KEY_TYPE, QQShare.SHARE_TO_QQ_TYPE_IMAGE); 
   tencent.shareToQQ(mActivity, params, new IUiListener() {//分享后的回调 
    @Override 
    public void onComplete(Object o) { 
     ToastUtils.show(mActivity,"分享成功！"); 
    } 
    @Override 
    public void onError(UiError uiError) { 
     ToastUtils.show(mActivity,"分享失败，稍后重试！"); 
     Log.i(TAG,"shareToQQ onError"); 
    } 
    @Override 
    public void onCancel() { 
     Log.i(TAG,"shareToQQ onCancel"); 
    } 
   }); 
  } else { 
   ToastUtils.show(mActivity, "您没有安装QQ客户端"); 
  } 
}

4 QQ空间分享

public void shareToQQZone() { 
  if (iShareService.isQQInstalled()) { 
   Tencent tencent = Tencent.createInstance("QQ id", mActivity); 
   Bundle params = new Bundle(); 
   params.putString(QQShare.SHARE_TO_QQ_IMAGE_LOCAL_URL, mLatestImagePath); 
   params.putInt(QQShare.SHARE_TO_QQ_KEY_TYPE, QQShare.SHARE_TO_QQ_TYPE_IMAGE); 
   params.putInt(QQShare.SHARE_TO_QQ_EXT_INT, QQShare.SHARE_TO_QQ_FLAG_QZONE_AUTO_OPEN); 
   tencent.shareToQQ(mActivity, params, new IUiListener() { 
    @Override 
    public void onComplete(Object o) { 
     ToastUtils.show(mActivity,"分享成功！"); 
    } 
    @Override 
    public void onError(UiError uiError) { 
     ToastUtils.show(mActivity,"分享失败，请稍后重试！"); 
     Log.i(TAG,"shareToQQ onError，error code:"+uiError.errorCode); 
    } 
    @Override 
    public void onCancel() { 
     Log.i(TAG,"shareToQQ onCancel"); 
    } 
   }); 
  } else { 
   ToastUtils.show(mActivity, "您没有安装QQ客户端"); 
  }

5 微博分享

public void shareToWeibo() { 
  if (iShareService.isWeiboInstalled()) { 
   Log.i(TAG,"iShareService.isWeiboInstalled()"); 
   IWeiboShareAPI api = WeiboShareSDK.createWeiboAPI(mActivity, "微博id"); 
   if(api.isWeiboAppInstalled()) { 
    api.registerApp(); 
   } 
   WeiboMultiMessage weiboMultiMessage = new WeiboMultiMessage(); 
   Bitmap bitmap = mLatesBitmap;//截图bitmap 
   ImageObject imageObject = new ImageObject(); 
   imageObject.setImageObject(bitmap); 
   weiboMultiMessage.imageObject = imageObject; 
   SendMultiMessageToWeiboRequest request = new SendMultiMessageToWeiboRequest(); 
   request.transaction = String.valueOf(System.currentTimeMillis()); 
   request.multiMessage = weiboMultiMessage; 
   boolean requestWeibo = api.sendRequest(request); 
   Log.i(TAG,"share to weibo:"+requestWeibo ); 
  } else { 
   ToastUtils.show(mActivity, "您没有安装微博客户端"); 
  } 
}

总结

以上所述是小编给大家介绍的Android截屏分享功能，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对创新互联网站的支持！

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Android截屏分享功能

3、分享到QQ好友

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