Administrador de tiempo Administrador de alarmas - (19)

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);
    }
}