android 截屏的三种方法

1. 采用API做法,这种做法的好处是不需要特殊的权限处理。不过在一种情况下不能用，就是在打开camera的情况下使用这种方法：

private static Bitmap takeScreenShot(Activity activity) {
		// View是你需要截图的View
		View view = activity.getWindow().getDecorView();
		view.setDrawingCacheEnabled(true);
		view.buildDrawingCache();
		Bitmap b1 = null;
		try {
			b1 = view.getDrawingCache();
		} catch (OutOfMemoryError e) {
			// TODO: handle exception
		}

		// 获取状态栏高度
		Rect frame = new Rect();
		activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
		int statusBarHeight = frame.top;
		System.out.println(statusBarHeight);
		// 获取屏幕长和高
		int width = activity.getWindowManager().getDefaultDisplay().getWidth();
		int height = activity.getWindowManager().getDefaultDisplay().getHeight();
		// 去掉标题栏
		// Bitmap b = Bitmap.createBitmap(b1, 0, 25, 320, 455);
		Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height - statusBarHeight);
		view.destroyDrawingCache();
		return b;
	}

2.采用Surface的隐藏方法，不过这种方法需要的源码中重新build.

void takeScreenshot() {
		// We need to orient the screenshot correctly (and the Surface api seems to take screenshots
		// only in the natural orientation of the device :!)
		mDisplay.getRealMetrics(mDisplayMetrics);
		float[] dims = { mDisplayMetrics.widthPixels, mDisplayMetrics.heightPixels };
		float degrees = getDegreesForRotation(mDisplay.getRotation());
		boolean requiresRotation = (degrees > 0);
		if (requiresRotation) {
			// Get the dimensions of the device in its native orientation
			mDisplayMatrix.reset();
			mDisplayMatrix.preRotate(-degrees);
			mDisplayMatrix.mapPoints(dims);
			dims[0] = Math.abs(dims[0]);
			dims[1] = Math.abs(dims[1]);
		}

		// Take the screenshot
		mScreenBitmap = Surface.screenshot((int) dims[0], (int) dims[1]);
		// mScreenBitmap = android.view.SurfaceControl.screenshot((int) dims[0], (int) dims[1]);
		if (mScreenBitmap == null) {
			// notifyScreenshotError(mContext, mNotificationManager);
			// finisher.run();
			Log.i("W", "mScreenBitmap null");
			return;
		}

		if (requiresRotation) {
			// Rotate the screenshot to the current orientation
			Bitmap ss = Bitmap.createBitmap(mDisplayMetrics.widthPixels, mDisplayMetrics.heightPixels, Bitmap.Config.ARGB_8888);
			Canvas c = new Canvas(ss);
			c.translate(ss.getWidth() / 2, ss.getHeight() / 2);
			c.rotate(degrees);
			c.translate(-dims[0] / 2, -dims[1] / 2);
			c.drawBitmap(mScreenBitmap, 0, 0, null);
			c.setBitmap(null);
			// Recycle the previous bitmap
			mScreenBitmap.recycle();
			mScreenBitmap = ss;
		}

		// Optimizations
		mScreenBitmap.setHasAlpha(false);
		mScreenBitmap.prepareToDraw();

		SimpleDateFormat sdf = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss_SS");
		String name = sdf.format(new Date()) + ".jpg";
		savePic(mScreenBitmap, name);

		// Start the post-screenshot animation
		// startAnimation(finisher, mDisplayMetrics.widthPixels, mDisplayMetrics.heightPixels, statusBarVisible, navBarVisible);
	}

3.采用命令的方式，这种方式的4.0之后都可以（包括4.0），如果要在程序中实现，需要系统权限。

    

screencap /mnt/sdcard/screen.png

      4.0之后也提供screenrecord录制屏幕的方法：

   

screenrecord --h                                     
Usage: screenrecord [options] <filename>

Records the device's display to a .mp4 file.

Options:
--size WIDTHxHEIGHT
    Set the video size, e.g. "1280x720".  Default is the device's main
    display resolution (if supported), 1280x720 if not.  For best results,
    use a size supported by the AVC encoder.
--bit-rate RATE
    Set the video bit rate, in megabits per second.  Default 4Mbps.
--time-limit TIME
    Set the maximum recording time, in seconds.  Default / maximum is 180.
--rotate
    Rotate the output 90 degrees.
--verbose
    Display interesting information on stdout.
--help
    Show this message.

Recording continues until Ctrl-C is hit or the time limit is reached.