获取指定Activity的截屏，保存到png文件

/**
* 获取指定Activity的截屏，保存到png文件
* Created by Administrator on 2017-02-09.
*/

public class ScreenShot {
// 获取指定Activity的截屏，保存到png文件
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 = 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;
}

// 保存到sdcard
private 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) {
    ScreenShot.savePic(ScreenShot.takeScreenShot(a), "sdcard/test_screeshot.png");
}

public static Bitmap shootBitmap(Activity a) {
    return ScreenShot.takeScreenShot(a);
}

}