import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.view.View;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;


public class ScreenShot {
    
    public static void shoot(Activity a, File filePath) {
        if (filePath == null) {
            return;
        }
        if (!filePath.getParentFile().exists()) {
            filePath.getParentFile().mkdirs();
        }
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(filePath);
            if (null != fos) {
                takeScreenShot(a).compress(Bitmap.CompressFormat.PNG, 100, fos);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            if (fos != null) {
                try {
                    fos.flush();
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    private static Bitmap takeScreenShot(Activity activity) {
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bitmap = view.getDrawingCache();
        Rect frame = new Rect();
        activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
        int statusBarHeight = frame.top;
        int width = activity.getWindowManager().getDefaultDisplay().getWidth();
        int height = activity.getWindowManager().getDefaultDisplay()
                .getHeight();
        // 去掉標題欄
        Bitmap b = Bitmap.createBitmap(bitmap, 0, statusBarHeight, width,
                height - statusBarHeight);
        view.destroyDrawingCache();
        return b;
    }


}