来自 Intent 服务内部的 Android Alert 对话框
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Android Alert dialog from inside an intent service
提问by Sayed Jalil Hassan
I want to display an alert dialog from inside an intent service.
我想从意图服务内部显示警报对话框。
AlertDialog alertDialog = new AlertDialog.Builder(this).create();
This throws the following exception
这将引发以下异常
Unable to add window — token null is not for an application
I have tried IntentService.this and getApplicationContext() as well. Between i dont want to do it using an activity. I just want to show a simple alert dialog with a little text.
我也试过 IntentService.this 和 getApplicationContext() 。我不想使用活动来做到这一点。我只想显示一个带有一点文字的简单警报对话框。
回答by Niranj Patel
Need Activityfor display AlertDialog, because we can't display Dialogfrom any Service
需要Activity显示AlertDialog，因为我们不能Dialog从任何显示Service
Solution.
解决方案。
Create Activityas Dialog Theme and start that Activityfrom Service.
创建Activity为对话框主题并Activity从Service.
Just need to register you Activityin menifest.xmllike as below
只需注册你Activity在menifest.xml像如下
android:theme="@android:style/Theme.Dialog"
or
或者
android:theme="@android:style/Theme.Translucent.NoTitleBar"
MyDialog.java
我的对话框
public class MyDialog extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final AlertDialog alertDialog = new AlertDialog.Builder(this).create();
alertDialog.setTitle("your title");
alertDialog.setMessage("your message");
alertDialog.setIcon(R.drawable.icon);
alertDialog.show();
}
}
回答by Eliran Kuta
Only if you set your alertDialog type to TYPE_SYSTEM_ALERTit will be displayed from an intent service.
仅当您将 alertDialog 类型设置为TYPE_SYSTEM_ALERT它时，它才会从意图服务中显示。
AlertDialog alertDialog = new AlertDialog.Builder(this).create();
add these after your code:
在您的代码后添加这些：
alertDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
alertDialog.show();
But, it have a cost:
但是，它有一个成本：
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
回答by Jitesh Upadhyay
Please visit
请拜访
https://github.com/selmantayyar/Custom-SMS-Popup
https://github.com/selmantayyar/Custom-SMS-Popup
it will surly help you!!
它一定会帮助你！！
or what you can do is register anActivity in menifest.xml as follows
或者你可以做的是在menifest.xml中注册一个Activity，如下所示
android:theme="@android:style/Theme.Dialog"
or
或者
android:theme="@android:style/Theme.Translucent.NoTitleBar"
and work around it
并解决它
回答by Jitesh Upadhyay
The problem is because of Context. You can't use thisas Context in Intent Service. So need to pass a Context variable of your Intent Service to your Alert Dialog. Like,
问题是因为Context。您不能将其用作意图服务中的上下文。因此需要将您的意图服务的上下文变量传递给您的警报对话框。喜欢，
AlertDialog alertDialog = new AlertDialog.Builder(context).create();
