android - 检测电源键长按

Question

我一直在 Stackoverflow 上阅读一些帖子，但没有找到好的解决方案，我想知道是否可以检测到用户在尝试关闭设备时长按电源按钮的时间，我'想知道您是否可以检测到该事件，并让或不显示出现的对话框(重新启动、关闭等...)

我试过了:

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
        Toast.makeText(MainActivity.this, event.getKeyCode(), Toast.LENGTH_SHORT).show();
    return true;
}

但它没有显示，它也应该作为服务工作，我的意思是可以或不可以打开应用程序来显示那个 toast。

编辑

这就是我把 onCloseSystemDialog

//home or recent button
public void onCloseSystemDialogs(String reason) {
    if ("globalactions".equals(reason)) {
        Toast.makeText(PowerButtonService.this, "yaps", Toast.LENGTH_SHORT).show();
        Intent i= new Intent(getBaseContext(), Demo.class);
        i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        getApplication().startActivity(i);
    //} else if ("homekey".equals(reason)) {
        //home key pressed
    //} else if ("recentapss".equals(reason)) {
        // recent apps button clicked
    }
}

它工作正常，但仅当设备解锁时，设备锁定时不显示任何内容。

我还试图弄清楚当用户单击电源按钮时如何删除对话框我试过这个:

getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);

但如果我想再次显示，我该怎么做呢？

Answer 1

分享我的方法来做你想做的事。

基本上，它的作用是

1. 请求系统权限 draw overlay (这不是正常或易受攻击的权限)。这不是用户权限，因此您应该通过请求真正知道自己在做什么。

   public class MainActivity extends AppCompatActivity {
   
       public final static int REQUEST_CODE = 10101;
   
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
           if (checkDrawOverlayPermission()) {
               startService(new Intent(this, PowerButtonService.class));
           }
       }
   
       public boolean checkDrawOverlayPermission() {
           if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
               return true;
           }
           if (!Settings.canDrawOverlays(this)) {
               /** if not construct intent to request permission */
               Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                   Uri.parse("package:" + getPackageName()));
           /** request permission via start activity for result */
               startActivityForResult(intent, REQUEST_CODE);
               return false;
           } else {
               return true;
           }
       }
   
       @Override
       @TargetApi(Build.VERSION_CODES.M)
       protected void onActivityResult(int requestCode, int resultCode, Intent data) {
           if (requestCode == REQUEST_CODE) {
               if (Settings.canDrawOverlays(this)) {
                   startService(new Intent(this, PowerButtonService.class));
               }
           }
       }
   }
   

2. 启动服务并向WindowManager

添加特殊 View

3. 等待 View 的 onCloseSystemDialogs 方法中的操作。

   public class PowerButtonService extends Service {
   
       public PowerButtonService() {
   
       }
   
       @Override
       public void onCreate() {
           super.onCreate();
           LinearLayout mLinear = new LinearLayout(getApplicationContext()) {
   
               //home or recent button
               public void onCloseSystemDialogs(String reason) {
                   if ("globalactions".equals(reason)) {
                       Log.i("Key", "Long press on power button");
                   } else if ("homekey".equals(reason)) {
                       //home key pressed
                   } else if ("recentapps".equals(reason)) {
                       // recent apps button clicked
                   }
               }
   
               @Override
               public boolean dispatchKeyEvent(KeyEvent event) {
                   if (event.getKeyCode() == KeyEvent.KEYCODE_BACK
                       || event.getKeyCode() == KeyEvent.KEYCODE_VOLUME_UP
                       || event.getKeyCode() == KeyEvent.KEYCODE_VOLUME_DOWN
                       || event.getKeyCode() == KeyEvent.KEYCODE_CAMERA
                       || event.getKeyCode() == KeyEvent.KEYCODE_POWER) {
                       Log.i("Key", "keycode " + event.getKeyCode());
                   }
                   return super.dispatchKeyEvent(event);
               }
           };
   
           mLinear.setFocusable(true);
   
           View mView = LayoutInflater.from(this).inflate(R.layout.service_layout, mLinear);
           WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
   
           //params
          final WindowManager.LayoutParams params;
   if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
   
       params = new WindowManager.LayoutParams(
               100,
               100,
               WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
               WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
                       | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
                       | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
               PixelFormat.TRANSLUCENT);
   } else {
       params = new WindowManager.LayoutParams(
               100,
               100,
               WindowManager.LayoutParams.TYPE_PHONE,
               WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
                       | WindowManager.LayoutParams.FLAG_FULLSCREEN
                       | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
                       | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON,
               PixelFormat.TRANSLUCENT);
   }
           params.gravity = Gravity.LEFT | Gravity.CENTER_VERTICAL;
           wm.addView(mView, params);
       }
   
       @Override
       public IBinder onBind(Intent intent) {
           return null;
       }
   }
   

list :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="powerbuttonpress">

    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>

        <service
            android:name=".PowerButtonService"
            android:enabled="true"
            android:exported="true">
        </service>

    </application>

</manifest>

service_layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

</LinearLayout>