package com.qidian.chapter07.receiver;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.util.Log;
public class AlarmReceiver extends BroadcastReceiver {
public static final String ALARM_ACTION = "com.qidian.chapter07.alarm";
final Context mContext;
public AlarmReceiver(Context context) {
this.mContext = context;
}
@Override
public void onReceive(Context context, Intent intent) {
if (intent != null && intent.getAction().equals(ALARM_ACTION)) {
Log.d("guo", "onReceive: 收到闹钟广播");
sendAlarm();
}
}
// 发送闹钟广播
public void sendAlarm() {
Intent intent = new Intent(ALARM_ACTION);
// 创建一个用于广播的延迟意图
PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext, 0, intent,PendingIntent.FLAG_IMMUTABLE);
// 从系统服务中获取闹钟管理器
AlarmManager alarmManager = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
// 允许在空闲时发送广播,Android 6.0之后新增方法
alarmManager.setAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,1000,pendingIntent);
} else {
// 设置一次性闹钟,延迟若干秒后,携带延迟意图发送闹钟广播,(但在Android 6.0之后set方法在暗屏时不保证发送广播)
alarmManager.set(AlarmManager.RTC_WAKEUP,1000,pendingIntent);
}
// 设置重复闹钟,(但从Android 6.0开始,setRepeating方法不保证按时发送广播)
// alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),1000,pendingIntent);
}
}
package com.qidian.chapter07;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import androidx.appcompat.app.AppCompatActivity;
import com.qidian.chapter07.receiver.AlarmReceiver;
public class AlarmActivity extends AppCompatActivity implements View.OnClickListener {
private AlarmReceiver alarmReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_alarm);
findViewById(R.id.btn_alarm).setOnClickListener(this);
}
@Override
public void onClick(View v) {
alarmReceiver.sendAlarm();
}
@Override
protected void onStart() {
super.onStart();
alarmReceiver = new AlarmReceiver(getApplicationContext());
IntentFilter filter = new IntentFilter(AlarmReceiver.ALARM_ACTION);
registerReceiver(alarmReceiver,filter);
}
@Override
protected void onStop() {
super.onStop();
unregisterReceiver(alarmReceiver);
}
}