android 截屏

1、网上流传的view.getDrawingCache(); 截取带视频的页是黑框。 那么怎么太能截取上的，我的思路是获取视频的当前一帧，算好坐标，把view.getDrawingCache();获取的图片与当前帧合成一张图。（上图坐标算的不是很准确，但是结果是实现了的）

2、代码如下：

package com.example.screenshot;import java.io.File;import android.app.AlertDialog;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Matrix;import android.media.MediaMetadataRetriever;import android.media.MediaPlayer;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.support.v7.app.ActionBarActivity;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup.LayoutParams;import android.widget.ImageView;import android.widget.MediaController;import android.widget.TextView;import android.widget.Toast;import android.widget.VideoView;public class MainActivity extends ActionBarActivity {private VideoView myVideoView;MediaMetadataRetriever mediaMetadataRetriever;MediaController myMediaController;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mediaMetadataRetriever = new MediaMetadataRetriever();mediaMetadataRetriever.setDataSource("/storage/emulated/0/DCIM/Camera/222.mp4");myVideoView = (VideoView) findViewById(R.id.videoView1);myVideoView.setVideoURI(Uri.parse("/storage/emulated/0/DCIM/Camera/222.mp4"));myVideoView.setOnCompletionListener(myVideoViewCompletionListener);myVideoView.setOnPreparedListener(MyVideoViewPreparedListener);myVideoView.setOnErrorListener(myVideoViewErrorListener);myVideoView.requestFocus();myVideoView.start();Log.d("yanglei", Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "DCIM" + File.separator + "111.mp4");myVideoView.start();}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings_3) {String name = System.currentTimeMillis() + ".png";String path = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + name;Toast.makeText(this, path, Toast.LENGTH_LONG).show();TextView txt = (TextView) findViewById(R.id.path);txt.setText("请去：" + path + "看截图结果");Bitmap bg = ScreenShot.takeScreenShot(this);int currentPosition = myVideoView.getCurrentPosition(); //in millisecondToast.makeText(MainActivity.this, "Current Position: " + currentPosition + " (ms)", Toast.LENGTH_LONG).show();Bitmap bmFrame = mediaMetadataRetriever.getFrameAtTime(currentPosition * 1000); //unit in microsecondif (bmFrame == null) {Toast.makeText(MainActivity.this, "bmFrame == null!", Toast.LENGTH_LONG).show();} else {Matrix matrix = new Matrix();float scalex = Float.valueOf(myVideoView.getWidth()) / Float.valueOf(bmFrame.getWidth());float scaley = Float.valueOf(myVideoView.getHeight()) / Float.valueOf(bmFrame.getHeight());matrix.postScale(scalex, scaley);Bitmap foreground = Bitmap.createBitmap(bmFrame, 0, 0, bmFrame.getWidth(), bmFrame.getHeight(), matrix, true);bmFrame.recycle();Bitmap result = toConformBitmap(bg, foreground, myVideoView);AlertDialog.Builder myCaptureDialog = new AlertDialog.Builder(MainActivity.this);ImageView capturedImageView = new ImageView(MainActivity.this);capturedImageView.setImageBitmap(result);LayoutParams capturedImageViewLayoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);capturedImageView.setLayoutParams(capturedImageViewLayoutParams);myCaptureDialog.setView(capturedImageView);myCaptureDialog.show();}myVideoView.stopPlayback();return true;}return super.onOptionsItemSelected(item);}MediaPlayer.OnCompletionListener myVideoViewCompletionListener = new MediaPlayer.OnCompletionListener() {@Overridepublic void onCompletion(MediaPlayer arg0) {Toast.makeText(MainActivity.this, "End of Video", Toast.LENGTH_LONG).show();}};MediaPlayer.OnPreparedListener MyVideoViewPreparedListener = new MediaPlayer.OnPreparedListener() {@Overridepublic void onPrepared(MediaPlayer mp) {long duration = myVideoView.getDuration(); //in millisecondToast.makeText(MainActivity.this, "Duration: " + duration + " (ms)", Toast.LENGTH_LONG).show();}};MediaPlayer.OnErrorListener myVideoViewErrorListener = new MediaPlayer.OnErrorListener() {@Overridepublic boolean onError(MediaPlayer mp, int what, int extra) {Toast.makeText(MainActivity.this, "Error!!!", Toast.LENGTH_LONG).show();return true;}};private Bitmap toConformBitmap(Bitmap background, Bitmap foreground, View videoView) {if (background == null) {return null;}int bgWidth = background.getWidth();int bgHeight = background.getHeight();Bitmap newbmp = Bitmap.createBitmap(bgWidth, bgHeight, Config.ARGB_8888);Canvas cv = new Canvas(newbmp);cv.drawBitmap(background, 0, 0, null);//在 0，0坐标开始画入bg   int[] location = new int[2];videoView.getLocationOnScreen(location);int x = location[0];int y = location[1];cv.drawBitmap(foreground, x, y, null);//在 0，0坐标开始画入fg ，可以从任意位置画入cv.save(Canvas.ALL_SAVE_FLAG);//保存   cv.restore();//存储   return newbmp;}}

package com.example.screenshot;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.Rect;import android.util.Log;import android.view.View;public class ScreenShot {// 获取指定Activity的截屏，保存到png文件public static Bitmap takeScreenShot(Activity activity) {// View是你需要截图的ViewView view = activity.getWindow().getDecorView();view.setDrawingCacheEnabled(true);view.buildDrawingCache();Bitmap b1 = view.getDrawingCache();// 获取状态栏高度Rect frame = new Rect();activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);int statusBarHeight = frame.top;Log.i("TAG", "" + statusBarHeight);// 获取屏幕长和高int width = activity.getWindowManager().getDefaultDisplay().getWidth();int height = activity.getWindowManager().getDefaultDisplay().getHeight();// 去掉状态栏Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height - statusBarHeight);view.destroyDrawingCache();return b;}// 保存到sdcardpublic static void savePic(Bitmap b, String strFileName) {FileOutputStream fos = null;try {fos = new FileOutputStream(strFileName);if (null != fos) {b.compress(Bitmap.CompressFormat.PNG, 90, fos);fos.flush();fos.close();}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}// 程序入口public static void shoot(Activity a, String path) {ScreenShot.savePic(ScreenShot.takeScreenShot(a), path);}}

 内容参考网上博客。