基本上，这里解释了 Facebook 如何让他们的 Chathead 应用程序浮动在其他应用程序之上，并且您必须将其作为服务运行。我遵循了一个示例，该示例使图像图标浮动在其他所有内容之上。这是示例中的代码。这不是您想要的确切答案，但它应该会有所帮助，并且您可以将代码调整为您需要做的事情。您从正确的方向开始，我希望这将有助于缩小您需要的绝对方向。
MainActivity.java
package com.example.floatingicon;
import com.example.floatingicon.R;
import com.example.floatingicon.MainService;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity
{
@Override
protected void onCreate(Bundle icicle){
super.onCreate(icicle);
setContentView(R.layout.main);
Bundle bund = getIntent().getExtras();
if(bund != null && bun.getString("LAUNCH").equals("YES")){
startService(new Intent(MainActivity.this, MainService.class));
}
Button start = (Button)findViewById(R.id.btnStart);
start.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
startService(new Intent(MainActivity.this, MainService.class));
}
});
Button stop = (Button)findViewById(R.id.btnStop);
stop.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
stopService(new Intent(MainActivity.this, MainService.class));
}
});
}
@Override
protected void onResume(){
Bundle bund = getIntent().getExtras();
if(bund != null && bund.getString("LAUNCH").equals("YES")){
startService(new Intent(MainActivity.this, MainService.class));
}
super.onResume();
}
}
主服务.java
package com.example.floatingicon;
import com.example.floatingicon.R;
import android.app.Service;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.os.IBinder;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;
public class MainService extends Service {
private WindowManager windowManager;
private ImageView floatIcon;
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
super.onCreate();
windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
floatIcon = new ImageView(this);
floatIcon.setImageResource(R.drawable.floating);
final WindowManager.LayoutParams params = new WindowManager.LayoutParams(
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.TYPE_PHONE,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
PixelFormat.TRANSLUCENT);
params.gravity = Gravity.TOP | Gravity.LEFT;
params.x = 0;
params.y = 100;
windowManager.addView(floatIcon, params);
try {
floatIcon.setOnTouchListener(new View.OnTouchListener() {
private WindowManager.LayoutParams paramsF = params;
private int initialX;
private int initialY;
private float initialTouchX;
private float initialTouchY;
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
// Get current time in nano seconds.
initialX = paramsF.x;
initialY = paramsF.y;
initialTouchX = event.getRawX();
initialTouchY = event.getRawY();
break;
case MotionEvent.ACTION_UP:
break;
case MotionEvent.ACTION_MOVE:
paramsF.x = initialX + (int) (event.getRawX() - initialTouchX);
paramsF.y = initialY + (int) (event.getRawY() - initialTouchY);
windowManager.updateViewLayout(floatIcon, paramsF);
break;
}
return false;
}
});
} catch (Exception e) {
// TODO: handle exception
}
}
@Override
public void onDestroy() {
super.onDestroy();
if (floatIcon != null) windowManager.removeView(floatIcon);
}
}
主要的.xml
<?xml version="1.0" encoding="utf-8" ?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:orientation="vertical"
tools:context=".MainActivity" >
<Button
android:id="@+id/btnStart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginTop="100dp"
android:text="@string/start" />
<Button
android:id="@+id/btnStop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@id/btnStart"
android:layout_alignRight="@id/btnStart"
android:layout_below="@id/btnStart"
android:layout_marginTop="10dp"
android:text="@string/stop" />
</RelativeLayout>
这应该可以帮助您开始，除非您已经完成了所有这些时间。