Android 常用工具类之 ScreenShotUtil

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.util.Log;
import android.view.View;
import android.view.Window;

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


public class ScreenShotUtil {

    /**
     * 截图
     *
     * @param activity    截取activity 所在的页面的截图,即使退到后台也是截取这个activity
     * @param strFileName 文件全路径:例如 "/sdcard/screen_shot_20160424.jpg"
     */
    public static void shot(Activity activity, String strFileName) {
        Bitmap takeShot = takeShot(activity);
        savePic(takeShot, strFileName);
    }

    private static Bitmap takeShot(Activity activity) {
        // 获取windows中最顶层的view
        View view = activity.getWindow().getDecorView();
        // 允许当前窗口保存缓存信息
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();

        //状态栏高度
        Rect outRect = new Rect();
        view.getWindowVisibleDisplayFrame(outRect);
        int statusBarHeight = outRect.top;

        //状态栏+标题栏目的高度
        statusBarHeight = activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();

        //屏幕宽高
        int height = activity.getWindowManager().getDefaultDisplay().getHeight();
        int width = activity.getWindowManager().getDefaultDisplay().getWidth();

        Bitmap b = Bitmap.createBitmap(view.getDrawingCache(), 0, statusBarHeight, width, height - statusBarHeight);
        // 销毁缓存信息
        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) {
                // 第一参数是图片格式，第二个是图片质量，第三个是输出流
                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();
        }
    }

}