当android中的警报响起时,我想创建一个AlertDialog.此外,我想创建一个通知,具体取决于用户在对话框上的单选按钮中单击的选项.
当我尝试使用context或getApplicationContext()时出现问题.
这是我的代码:
public voID onReceive(final Context context, Intent intent){ final CharSequence[] items = {" I'm taking the dose Now! "," Remind again in ten minutes. "," Ignore for Now. "}; String dosename = intent.getStringExtra("dosename"); Toast.makeText(context, "Take medicine: " + dosename, Toast.LENGTH_LONG).show(); AlertDialog.Builder builder = new AlertDialog.Builder(context); builder.setTitle("It's time for your medicine."); builder.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() { public voID onClick(DialogInterface dialog, int item) { switch(item) { case 0: Toast.makeText(context, "Good.", Toast.LENGTH_SHORT).show(); break; case 1: Toast.makeText(context, "Reminder set in ten minutes.", Toast.LENGTH_SHORT).show(); break; case 2: Intent service1 = new Intent(context, DoseAlarmService.class); service1.putExtra("dosename", dosename); context.startService(service1); break; } } }); levelDialog = builder.create(); levelDialog.show();}
我尝试在switch case中使用getApplicationContext而不是context,但这是我得到的确切错误:
The method getApplicationContext() is undefined for the type new DialogInterface.OnClickListener(){}
有关如何前进的任何建议?
编辑:
直到现在,这些都是我尝试过的:
public voID onReceive(final Context context, Intent intent){ ctx = context; final CharSequence[] items = {" I'm taking the dose Now! "," Remind again in ten minutes. "," Ignore for Now. "}; String dosename = intent.getStringExtra("dosename"); Toast.makeText(ctx, "Take medicine: " + dosename, Toast.LENGTH_LONG).show(); AlertDialog.Builder builder = new AlertDialog.Builder(ctx.getApplicationContext()); builder.setTitle("It's time for your medicine."); builder.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() { public voID onClick(DialogInterface dialog, int item) { switch(item) { case 0: Toast.makeText(ctx, "Good.", Toast.LENGTH_SHORT).show(); break; case 1: Toast.makeText(ctx, "Reminder set in ten minutes.", Toast.LENGTH_SHORT).show(); break; case 2: Intent service1 = new Intent(ctx.getApplicationContext(), DoseAlarmService.class); service1.putExtra("dosename", dosename); ctx.startService(service1); break; } } }); levelDialog = builder.create(); levelDialog.show();}
另外,我没有使用ctx,而是直接使用了context.getApplicationContext()并进行了检查.它不起作用.
此外,当我注释掉所有有问题的区域并运行以验证对话框是否出现时,我得到以下异常:
07-23 13:26:21.316: E/AndroIDRuntime(1756): java.lang.RuntimeException: Unable to start receiver com.dosemanager.ui.DoseAlarmReceIEver: androID.vIEw.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
请帮忙!
解决方法:
嗯,你已经有了你的上下文 – 它是onReceive()的参数.您不需要使用getApplicationContext().
编辑:你不能在switch case中使用context,因为在Receiver类中定义了context并且你试图在onClickListener类中使用它.
我建议这个:
public class %YOUR_RECEIVER_CLASS% { private Context context; public onReceive(Context context, ...) { this.context = context; } }
现在你可以在任何地方使用上下文
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