我正在尝试在用户输入的秒数后创建通知。在我看来,AlarmManager和BroadcastReceiver工作正常(onReceive()中的Toast出现在正确的时间后)但我的通知不起作用(它没有出现)。
我的通知有什么问题?
这是我的代码:
MainActivity:
package com.example.user.alarm;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
Button btn_set;
EditText et_time;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_set = (Button) findViewById(R.id.setAlarmButton);
et_time = (EditText) findViewById(R.id.edittext);
btn_set.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int time = Integer.parseInt(et_time.getText().toString());
Intent intent = new Intent(MainActivity.this, Alarm.class);
PendingIntent pi = PendingIntent.getBroadcast(getApplicationContext(), 0, intent, 0);
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+time*1000, pi );
}
});
}
}
警报
package com.example.user.alarm;
import android.app.NotificationManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.support.v4.app.NotificationCompat;
import android.widget.Toast;
public class Alarm extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent1) {
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context);
mBuilder.setSmallIcon(R.drawable.ic_action_name);
mBuilder.setContentTitle("Notification Alert, Click Me!");
mBuilder.setContentText("Hi, This is Android Notification Detail!");
NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
// notificationID allows you to update the notification later on.
mNotificationManager.notify(0, mBuilder.build());
Toast.makeText(context, "Alarm Alarm Alarm", Toast.LENGTH_SHORT).show();
}
}
清单
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.user.alarm">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name="com.example.user.alarm.MainActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name="com.example.user.alarm.Alarm"
/>
</application>
答案 0 :(得分:0)
如果您的目标API是Android O,则需要一个频道ID。