Facebook使用哪些API来创建聊天头？ [英] What APIs in Android is Facebook using to create Chat Heads?

问题描述

Facebook如何在Android上创建聊天头？

解决方案

这个一个：

允许应用程序使用类型
TYPE_SYSTEM_ALERT打开窗口，显示在所有其他应用程序的顶部。
很少有应用程序应该使用这个权限;这些窗口用于与用户进行系统级交互的
。

常量值：android.permission.SYSTEM_ALERT_WINDOW

//编辑：
完整代码这里：

  public class ChatHeadService extends Service {
 
 private WindowManager windowManager ; 
私人ImageView chatHead; 
 
 @Override public IBinder onBind（Intent intent）{
 //未使用
返回null; 
} 
 
 @Override public void onCreate（）{
 super.onCreate（）; 
 
 windowManager =（WindowManager）getSystemService（WINDOW_SERVICE）; 
 
 chatHead = new ImageView（this）; 
 chatHead.setImageResource（R.drawable.android_head）; 
 
 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（chatHead，params）; 
} 
 
 @Override 
 public void onDestroy（）{
 super.onDestroy（）; 
 if（chatHead！= null）windowManager.removeView（chatHead）; 
} 
} 
  

不要忘记以某种方式启动服务： / p>

  startService（new Intent（context，ChatHeadService.class））; 
  

..并将此服务添加到您的清单。

How does Facebook create the Chat Heads on Android? What is the API to create the floating views on top of all other views?

解决方案

This one:

Allows an application to open windows using the type TYPE_SYSTEM_ALERT, shown on top of all other applications. Very few applications should use this permission; these windows are intended for system-level interaction with the user.

Constant Value: "android.permission.SYSTEM_ALERT_WINDOW"

//EDIT: The full code here:

public class ChatHeadService extends Service {

  private WindowManager windowManager;
  private ImageView chatHead;

  @Override public IBinder onBind(Intent intent) {
    // Not used
    return null;
  }

  @Override public void onCreate() {
    super.onCreate();

    windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);

    chatHead = new ImageView(this);
    chatHead.setImageResource(R.drawable.android_head);

    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(chatHead, params);
  }

  @Override
  public void onDestroy() {
    super.onDestroy();
    if (chatHead != null) windowManager.removeView(chatHead);
  }
}

Don't forget to start the service somehow:

startService(new Intent(context, ChatHeadService.class));

.. And add this service to your Manifest.

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