我想在关闭申请后显示一个对话框。 (例如,10秒后。) 我用过警报:
MainActivity:
@Override
protected void onStop() {
// TODO Auto-generated method stub
setupAlarm(10);
super.onStop();
}
private void setupAlarm(int seconds) {
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
Intent intent = new Intent(getBaseContext(), OnAlarmReceive.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
MainActivity.this, 0, intent,
PendingIntent.FLAG_UPDATE_CURRENT);
// Getting current time and add the seconds in it
Calendar cal = Calendar.getInstance();
cal.add(Calendar.SECOND, seconds);
alarmManager.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), pendingIntent);
}
我的broadcastReceiver:
public class OnAlarmReceive extends BroadcastReceiver {
Context con = null ;
private final Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
final Dialog dialog = new Dialog(con);
dialog.setContentView(R.layout.custom_dialog_update);
dialog.setTitle("Title...");
// set the custom dialog components - text, image and button
TextView text = (TextView) dialog.findViewById(R.id.text);
text.setText("Android custom dialog example!");
ImageView image = (ImageView) dialog.findViewById(R.id.image);
image.setImageResource(R.drawable.ic_launcher);
Button dialogButton = (Button) dialog.findViewById(R.id.dialogButtonOK);
// if button is clicked, close the custom dialog
dialogButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
dialog.show();
super.handleMessage(msg);
}
};
@Override
public void onReceive(Context context, Intent intent) {
// Start the MainActivity
// Intent i = new Intent(context, MainActivity.class);
// i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// context.startActivity(i);
// Toast.makeText(context, "Please Updete Your Clip2iNi", Toast.LENGTH_LONG).show();
con = context ;
handler.sendEmptyMessage(0);
}
}
错误:
02-24 12:38:53.796:E / AndroidRuntime(14711):致命异常:主要 02-24 12:38:53.796:E / AndroidRuntime(14711): android.view.WindowManager $ BadTokenException:无法添加窗口 - token null不适用于应用程序02-24 12:38:53.796: E / AndroidRuntime(14711):at android.view.ViewRootImpl.setView(ViewRootImpl.java:757)02-24 12:38:53.796:E / AndroidRuntime(14711):at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:265) 02-24 12:38:53.796:E / AndroidRuntime(14711):at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) 02-24 12:38:53.796:E / AndroidRuntime(14711):at android.app.Dialog.show(Dialog.java:282)02-24 12:38:53.796: E / AndroidRuntime(14711):at com.example.ex56.OnAlarmReceive $ 1.handleMessage(OnAlarmReceive.java:43) 02-24 12:38:53.796:E / AndroidRuntime(14711):at android.os.Handler.dispatchMessage(Handler.java:99)02-24 12:38:53.796:E / AndroidRuntime(14711):at android.os.Looper.loop(Looper.java:137)02-24 12:38:53.796: E / AndroidRuntime(14711):at android.app.ActivityThread.main(ActivityThread.java:5328)02-24 12:38:53.796:E / AndroidRuntime(14711):at java.lang.reflect.Method.invokeNative(Native Method)02-24 12:38:53.796:E / AndroidRuntime(14711):at java.lang.reflect.Method.invoke(Method.java:511)02-24 12:38:53.796: E / AndroidRuntime(14711):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1102) 02-24 12:38:53.796:E / AndroidRuntime(14711):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)02-24 12:38:53.796:E / AndroidRuntime(14711):at dalvik.system.NativeStart.main(原生方法)
没有对话,一切都是正确的。
答案 0 :(得分:2)
final Dialog dialog = new Dialog(con)
在此行con
null
尝试传递Activity
引用,如
final Dialog dialog = new Dialog(YourActivity.this)
答案 1 :(得分:2)
首先:您正在向Dialog构造函数发送空上下文。这就是你得到这个错误的原因。 第二:您应该显示通知,而不是来自后台服务的对话框。 Dialog会中断用户及其糟糕的用户体验。
第三次:您将此命名为警报服务并使用接收器对其进行扩展,这有点令人困惑。
不建议从服务中显示对话框。如果有更新,则从后台向用户显示通知。
感谢任何反馈。
感谢。