Android:应用内部截屏的实现

/*** 作者：CnPeng* <p>* 时间：2017/6/27:下午3:06* <p>* 说明：应用程序内部截屏的实现(不截状态栏，兼容5.0 以上及以下版本)* -- 申请写入SD的权限* -- 实现应用内截取屏幕的功能(不截状态栏)* -- 计算状态栏的高度(两种方式)* -- 发送广播通知相册/图库刷新数据*/public class ScreenShotActivity extends AppCompatActivity {private Button    bt_screenShot;private ImageView iv_showScreenShot;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_screen_shot);initView();initEvent();}private void initView() {bt_screenShot = (Button) findViewById(R.id.bt_clickToScreenShot);iv_showScreenShot = (ImageView) findViewById(R.id.iv_showScreenShot);}private void initEvent() {bt_screenShot.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {       //点击之后，保存截图，更新相册Bitmap bitmap = getScreenShotBmp();boolean saveSuccess = saveScreenShotToSD(bitmap);String hint = saveSuccess ? "保存成功" : "保存失败";Toast.makeText(ScreenShotActivity.this, hint, Toast.LENGTH_SHORT).show();if (saveSuccess) {iv_showScreenShot.setImageBitmap(bitmap);}}});}/*** 发送广播更新相册，不更新的话，在相册中将无法查看到截取的图片*/private void updateGallery(File file) {Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);Uri uri = Uri.fromFile(file);intent.setData(uri);sendBroadcast(intent);}/*** 保存截图到本地** @param bitmap 截取到的图片*/private boolean saveScreenShotToSD(Bitmap bitmap) {if (bitmap != null) {if (Environment.getExternalStorageState().equals(MEDIA_MOUNTED)) {  //如果SD存储设备可用String path = Environment.getExternalStorageDirectory().getPath() + File.separator + "校园集结号";File dir = new File(path);if (!dir.exists()) {dir.mkdir();   //创建目录}File file = new File(dir, "截图成功.png");FileOutputStream fos = null;try {fos = new FileOutputStream(file);//根据指定的格式、质量、输出流 将bitmap保存到本地，并返回是否保存成功boolean saveSuccess = bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);if (saveSuccess) {updateGallery(file);    //刷新相册}return saveSuccess;} catch (FileNotFoundException e1) {e1.printStackTrace();return false;} finally {if (fos != null) {try {fos.close();    //关闭流防止溢出} catch (IOException e1) {e1.printStackTrace();}}}} else {Toast.makeText(this, "本地存储空间不可用", Toast.LENGTH_SHORT).show();}}return false;}/*** 获取屏幕截图*/private Bitmap getScreenShotBmp() {View decorView = getWindow().getDecorView();    //获取当前activity所在的最顶层的view--DecorViewdecorView.setDrawingCacheEnabled(true);         //启用绘图缓存decorView.buildDrawingCache();                  //强制构建绘图缓存(防止上面启用绘图缓存的操作失败)Bitmap bitmap = decorView.getDrawingCache();     //获取绘图缓存中的 bitmap//        int statusBarHeight = getStatusBarHeight();int statusBarHeight = getStatusBarHeight(decorView);int newBmpHeight = bitmap.getHeight() - statusBarHeight;    //最终截取的图片的高度(取出状态栏之后的高度)bitmap = Bitmap.createBitmap(bitmap, 0, statusBarHeight, bitmap.getWidth(), newBmpHeight);decorView.setDrawingCacheEnabled(false);    //createBitmap完成之后一定要置为false，否则短时间内多次截图时内容不会变化！return bitmap;}/*** 获取状态栏高度方式2** @param decorView 要获取状态栏高度的页面所在的顶层布局*/private int getStatusBarHeight(View decorView) {Rect rect = new Rect();decorView.getWindowVisibleDisplayFrame(rect);return rect.top;}/*** 获取状态栏的高度--方式1*/public int getStatusBarHeight() {int statusBarHeight = 0;int resourceID = getResources().getIdentifier("status_bar_height", "dimen", "android");if (resourceID != 0) {statusBarHeight = getResources().getDimensionPixelSize(resourceID);}return statusBarHeight;}}