How to draw on top of the screen?

android screen overlay

Android 4.1.2 developers the option to have a screen overlay display Cpu use, this is how to do? How to achieve a similar effect? Java or C are row.

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Nobody paid me whining
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With Sticky activity

 import android.app.Activity; 
import android.graphics.PixelFormat; 
import android.view.Gravity; 
import android.view.LayoutInflater; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.WindowManager; 
import android.view.WindowManager.LayoutParams; 

public class FlowView {
private WindowManager wm = null; 
private WindowManager.LayoutParams wmParams = null; 
protected View view = null; 
private float x, y, startX, startY; 
private int TOOL_BAR_HIGH = 0; 
public FlowView (int viewid, Activity act) {
/ / Get WindowManager 
wm = (WindowManager) act.getApplicationContext () getSystemService ("window");. 
/ / Set LayoutParams (global variables) related parameters 
wmParams = new WindowManager.LayoutParams (); 

wmParams.type = LayoutParams.TYPE_PHONE; / / set the window type 
/ / WmParams.format = PixelFormat.RGBA_8888; / / set the image format, the effect of the background transparent 
/ / Set Window flag 
wmParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL 
| LayoutParams.FLAG_NOT_FOCUSABLE; 

/ / To the upper left corner of the screen as the origin, set x, y initial value 
wmParams.x = 0; 
wmParams.y = 0; 
/ / Set the window width data 
 suspensionTOOL_BAR_HIGH = 200; 
wmParams.width = LayoutParams.WRAP_CONTENT; 
wmParams.height = LayoutParams.WRAP_CONTENT; 
/ / Adjust floating windows 
wmParams.gravity = Gravity.LEFT | Gravity.CENTER_VERTICAL; 
/ / Display myFloatView image 

view = LayoutInflater.from (act) inflate (viewid, null);. 
wm.addView (view, wmParams); 
} 
public void destroy () {
if (view! = null) {
wm.removeView (view); 
} 
} 
public boolean onTouchEvent (MotionEvent event) {
/ / Touch point relative to the upper left corner of the screen coordinates 
x = event.getRawX (); 
y = event.getRawY () - TOOL_BAR_HIGH; 
/ / Log.d (TAG, "------ X:" + x + "------ Y:" + y); 
switch (event.getAction ()) {
case MotionEvent.ACTION_DOWN: 
startX = event.getX (); 
startY = event.getY (); 
break; 
case MotionEvent.ACTION_MOVE: 
updatePosition (); 
break; 
case MotionEvent.ACTION_UP: 
updatePosition (); 
startX = startY = 0; 
break; 
} 
return true; 
} 
/ / Update the position of the floating window parameters 
private void updatePosition () {
if (view! = null) {
/ / Current position 
 View ofwmParams.x = (int) (x - startX); 
wmParams.y = (int) (y - startY); 
wm.updateViewLayout (view, wmParams); 
} 
} 

} 

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Note added permissions

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There pointLocationView.java. Similar with yours. There is also the option of the developer, you can look at the code
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During this time busy postgraduate enrollment and the like, sorry late reply.
Thank you very much second floor, this way I have found on the Internet, but not the same and the cover layer.
Thank 4th floor, I went looking for first knot tie it.