开发警报应用

本文介绍了开发警报应用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想开发一个报警的应用。 该应用程序应该是这样的：

I'd like develop an Alarm Application. The application should work like this:

• 启动它
• 活动让我的时间
• 我可以设置报警
• 我可以关闭应用程序
• 当报警时间已到，开始一个活动（即使设备处于锁定状态）

我试图去适应这个样本 github/commonsguy/cwac-wakeful但我不能启动一个活动时，报警时间已到。

I have tried to adapt this sample github/commonsguy/cwac-wakeful but I cannot launch an activity when the alarm time comes.

我用这个code设置的报警器（用于测试我都插在活动的的onCreate 方法，此code）：

I use this code to setup the alarm (for test I have inserted this code on an onCreate method of activity):

Intent intent = new Intent(this, OnAlarmReceiver.class); PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0); Calendar cal = Calendar.getInstance(); cal.add(Calendar.SECOND, 10); AlarmManager alarm = (AlarmManager) getSystemService(Context.ALARM_SERVICE); alarm.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, cal.getTimeInMillis(), pendingIntent);

这是OnAlarmReceiver类：

this is the OnAlarmReceiver class:

public class OnAlarmReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Log.i(ClockActivity.LOG_TAG, "OnAlarmReceiver::onReceive"); WakefulIntentService.sendWakefulWork(context, AlarmService.class); } }

这是服务类：

public class AlarmService extends WakefulIntentService { public AlarmService(String name) { super(name); } @Override protected void doWakefulWork(Intent intent) { Log.i(ClockActivity.LOG_TAG, "AlarmService::doWakefulWork"); Intent newIntent = new Intent(getApplicationContext(), ClockActivity.class); newIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); newIntent.setAction(ClockActivity.ALARM_ACTION); getApplicationContext().startActivity(newIntent); } }

这是明显的，其中有设置服务和接收器的部分：

this is the portion of Manifest where are setup the service and the receiver:

<receiver android:name=".OnAlarmReceiver"></receiver> <service android:name=".AlarmService"></service>

在doWakefulWork方法不会被调用！

the doWakefulWork method is never called!

推荐答案

我做了这个应用程序：

AlarmActivity.java

package com.foo; import pack.breceiver.MyBroadcastReceiver; import android.app.Activity; import android.app.AlarmManager; import android.app.PendingIntent; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.EditText; import android.widget.Toast; import android.app.Activity; import android.os.Bundle; public class AlarmActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } public void startAlert(View view) { EditText text = (EditText) findViewById(R.id.time); int i = Integer.parseInt(text.getText().toString()); Intent intent = new Intent(this, MyBroadcastReceiver.class); PendingIntent pendingIntent = PendingIntent.getBroadcast( this.getApplicationContext(), 234324243, intent, 0); AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE); alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (i * 1000), pendingIntent); Toast.makeText(this, "Alarm set in " + i + " seconds", Toast.LENGTH_LONG).show(); } }

MyBroadcastReceiver.java

package pack.breceiver; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.os.Vibrator; import android.widget.Toast; public class MyBroadcastReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Toast.makeText(context, "Don't panik but your time is up!!!!", Toast.LENGTH_LONG).show(); /*// Vibrate the mobile phone Vibrator vibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE); vibrator.vibrate(2000); */ } }