android中 代码实现截图功能（静态+动态视频）

public class ScreenShot {

// 获取指定Activity的截屏，保存到png文件

static Bitmap takeScreenShot(Activity activity) {

Log.i("TAG","tackScreenShot");
// View是你须要截图的View
View view = activity.getWindow().getDecorView();
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap b1 = view.getDrawingCache();

// 获取状况栏高度
Rect frame = new Rect();
activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
int statusBarHeight = frame.top;
Log.i("TAG", "statusBarHeight = " + statusBarHeight);

// 获取屏幕长和高
int width = activity.getWindowManager().getDefaultDisplay().getWidth();
int height = activity.getWindowManager().getDefaultDisplay()
.getHeight();

// 去掉题目栏
// Bitmap b = Bitmap.createBitmap(b1, 0, 25, 320, 455);
Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height
- statusBarHeight);
view.destroyDrawingCache();
return b;
}

// 保存到sdcard
private static void savePic(Bitmap b, String strFileName) {

FileOutputStream fos = null;
try {
Log.i("TAG","start savePic");
fos = new FileOutputStream(strFileName);
Log.i("TAG","strFileName = " + strFileName);
if (null != fos) {
b.compress(Bitmap.CompressFormat.PNG, 90, fos);
fos.flush();
fos.close();
Log.i("TAG","save pic");
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

public static void shoot(Activity a,String b) {
//ScreenShot.savePic(ScreenShot.takeScreenShot(a), "sdcard/xx.png");
Log.i("TAG","shot");
Bitmap bitmap = ScreenShot.takeScreenShot(a);
ScreenShot.savePic(bitmap, b);
}
}

private Bitmap createVideoThumbnail(String filePath) {
Bitmap bitmap = null;
android.media.MediaMetadataRetriever retriever = new android.media.MediaMetadataRetriever();
try {// MODE_CAPTURE_FRAME_ONLY
//			retriever
//					.setMode(android.media.MediaMetadataRetriever.MODE_CAPTURE_FRAME_ONLY);
//			retriever.setMode(MediaMetadataRetriever.MODE_CAPTURE_FRAME_ONLY);
retriever.setDataSource(filePath);
//			bitmap = retriever.captureFrame();
String timeString = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);
long time = Long.parseLong(timeString) * 1000;
Log.i("TAG","time = " + time);
bitmap = retriever.getFrameAtTime(time*31/160); //按视频长度比例选择帧
} catch (IllegalArgumentException ex) {
// Assume this is a corrupt video file
} catch (RuntimeException ex) {
// Assume this is a corrupt video file.
} finally {
try {
retriever.release();
} catch (RuntimeException ex) {
// Ignore failures while cleaning up.
}
}
return bitmap;
}