Android 6.0“棉花糖”默认禁用悬浮窗口——解决方案

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Android 6.0“棉花糖”默认禁用悬浮窗口——解决方案

众所周知，google一开始并没有将悬浮窗口作为一个交互工具，而是希望`android.permission.SYSTEM_ALERT_WINDOW`能够老老实实地拿来做用户通知。所以在Android 6.0 Marshmallow（棉花糖）中，系统引入了新的应用授权系统，以确保用户能够对应用的权限进行逐项审核。因此我们在应用程序中并不能按照之前的方式添加权限，否则报错：

java.lang.RuntimeException: Unable to start receiver com.ygkey.www.floatingwindow.IntentReceiver: android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@d38bb2f -- permission denied for this window type            at android.app.ActivityThread.handleReceiver(ActivityThread.java:2732)            at android.app.ActivityThread.-wrap14(ActivityThread.java)            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1421)            at android.os.Handler.dispatchMessage(Handler.java:102)            at android.os.Looper.loop(Looper.java:148)            at android.app.ActivityThread.main(ActivityThread.java:5417)            at java.lang.reflect.Method.invoke(Native Method)            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)     Caused by: android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@d38bb2f -- permission denied for this window type            at android.view.ViewRootImpl.setView(ViewRootImpl.java:591)            at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:310)            at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85)            at com.ygkey.www.floatingwindow.MyWindowManager.createFloatView(MyWindowManager.java:129)            at com.ygkey.www.floatingwindow.IntentReceiver.onReceive(IntentReceiver.java:13)            at android.app.ActivityThread.handleReceiver(ActivityThread.java:2725)            at android.app.ActivityThread.-wrap14(ActivityThread.java)            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1421)            at android.os.Handler.dispatchMessage(Handler.java:102)            at android.os.Looper.loop(Looper.java:148)            at android.app.ActivityThread.main(ActivityThread.java:5417)            at java.lang.reflect.Method.invoke(Native Method)            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

因此，在进行弹出悬浮窗之前，可以做判断：

if (!Settings.canDrawOverlays(MainActivity.this)) {//判断android 6.0中是否开启权限      Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,      Uri.parse("package:" + getPackageName()));      //跳转到权限设置页面      startActivityForResult(intent, OVERLAY_PERMISSION_REQ_CODE);     } else {      Intent intent = new Intent(MainActivity.this, FloatWindowService.class);      startService(intent);      finish();}

之后，在权限设置后再次进行判断：

    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        if (requestCode == OVERLAY_PERMISSION_REQ_CODE) {            if (!Settings.canDrawOverlays(this)) {                // SYSTEM_ALERT_WINDOW permission not granted...            }        }    }

这样，就能够让用户主动选择是否开启权限了。初次写博客，本意分享，如果大家有了更好的解决方法，欢迎和我联系。

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