在Android 8.0.0设备中运行时，我的应用程序运行正常。但是在Àndroid 6.0.1中使用时，应用会崩溃。我检查了错误日志，崩溃原因是因为AlertDialog，
AlertDialog.Builder builder = new AlertDialog.Builder(context, R.style.MyAlertDialogStyle);
builder.setMessage("Would you like to enable it?")
.setTitle("No Internet Connection")
.setPositiveButton(" Enable Internet ", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent dialogIntent = new Intent(android.provider.Settings.ACTION_SETTINGS);
dialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(dialogIntent);
}
});
alert = builder.create();
alert.setCancelable(false);
alert.show();
MyAlertDialogStyle是，
<style name="MyAlertDialogStyle" parent="Theme.AppCompat.Light.Dialog.Alert">
<item name="colorAccent">#FFC107</item>
<item name="android:textColorPrimary">#FFFFFF</item>
<item name="android:background">#4CAF50</item>
</style>
错误是，
E/AndroidRuntime: FATAL EXCEPTION: main
Process: my.app.com, PID: 22952 java.lang.RuntimeException: Unable to start receiver my.app.com.receivers.NetworkChangeReceiver: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
at android.app.ActivityThread.handleReceiver(ActivityThread.java:3641)
at android.app.ActivityThread.access$2000(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1876)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
at android.view.ViewRootImpl.setView(ViewRootImpl.java:853)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:337)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
at android.app.Dialog.show(Dialog.java:350)
at my.app.com.preferences.GlobalModel.displayLoadingAlert(Global.java:130)
at my.app.com.receivers.NetworkChangeReceiver.onReceive(NetworkChangeReceiver.java:27)
at android.app.ActivityThread.handleReceiver(ActivityThread.java:3634)
at android.app.ActivityThread.access$2000(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1876)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
请帮我修复此问题，并确保我的应用程序适用于所有版本的android。提前谢谢。