所截取的图，实时显示在屏幕上。用户点击图片——消失；用户不点击，指定时间后——图片自动消失。
感性认识：
抛砖引玉，详见注释：
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.about_me:
//获取屏幕
View targetView = mActivity.getWindow().getDecorView();
targetView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN);//截全屏
targetView.setDrawingCacheEnabled(true);
Bitmap fullBitmap = Bitmap.createBitmap(targetView.getDrawingCache());
/**获取状态栏高度
Rect frame = new Rect();
mActivity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
int statusBarHeight = frame.top;*/
DisplayMetrics dm = mActivity.getResources().getDisplayMetrics();
/** 去掉标题栏
Bitmap bitmap = Bitmap.createBitmap(fullBitmap, 0, statusBarHeight, dm.widthPixels, dm.heightPixels - statusBarHeight);
targetView.destroyDrawingCache();*/
OutputStream output = null;
try {
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
String sdPath = Environment.getExternalStorageDirectory().getPath();//sd卡路径
String pngPath = sdPath + "/Remind/";//截图存放路径
File pngDir = new File(pngPath);
if (!pngDir.exists()) {
pngDir.mkdir();//make路径
}
String pngName = pngPath + System.currentTimeMillis() + ".png";
output = new FileOutputStream(pngName);
if (output != null) {
fullBitmap.compress(Bitmap.CompressFormat.PNG, 100, output);//100%高清大图
output.flush();
output.close();
}
/** WindowManager */
LayoutInflater inflater = LayoutInflater.from(mActivity);
screenShot = inflater.inflate(R.layout.screen_shot, null);
wmManager =(WindowManager) mActivity.getSystemService(mActivity.WINDOW_SERVICE);
WindowManager.LayoutParams wmParams = new WindowManager.LayoutParams();
ImageView shotImg = (ImageView) screenShot.findViewById(R.id.screen_shot_img);
shotImg.setImageBitmap(targetView.getDrawingCache());
/**
*以下都是WindowManager.LayoutParams的相关属性
*/
wmParams.type=WindowManager.LayoutParams.TYPE_PRIORITY_PHONE; //这里是关键
wmParams.format=PixelFormat.RGBA_8888;
wmParams.flags=WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;
wmParams.alpha = 0.8f; //透明度
//WindowManager位置
wmParams.width = dm.widthPixels * 1 / 2;
wmParams.height = dm.heightPixels * 1 / 2;
wmParams.x = dm.widthPixels * 1 / 2;
wmParams.y = - (dm.heightPixels * 1 / 5);
//添加View
wmManager.addView(screenShot, wmParams);
isRemoved = false;
//计时器
timer = new Timer();
//点击图片，消失。
shotImg.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
if (wmManager != null && !isRemoved) {
wmManager.removeView(screenShot);
isRemoved = true;
if (timer != null) {
timer.cancel();
}
}
}
});
//定时任务，显示3秒后自动消失。
timer.schedule(new TimerTask() {
@Override
public void run() {
if (wmManager != null && !isR