java - 在特定时间启动我的 Phonegap 应用程序(闹钟)

Question

好的，所以我正在尝试让我的 Phonegap 应用程序在特定时间启动，与闹钟功能相同。为此，我尝试编写自己的插件:

package de.ma;
import org.apache.cordova.api.PluginResult; 
import org.json.JSONArray;
import android.content.Intent;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.util.Log;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.os.Bundle;
import java.util.Calendar;
import android.os.SystemClock;
import com.phonegap.api.Plugin;

public class alarm extends Plugin {
@Override
public PluginResult execute(String arg0, JSONArray arg1, String arg2) {
    Calendar cal = Calendar.getInstance();
    // add 5 minutes to the calendar object
    cal.add(Calendar.SECOND, 5);
    Intent intent = new Intent(ctx, AlarmReciever.class);
    intent.putExtra("alarm_message", "O'Doyle Rules!");
    // In reality, you would want to have a static variable for the request code instead of 192837
    PendingIntent sender = PendingIntent.getBroadcast(this, 192837, intent, PendingIntent.FLAG_UPDATE_CURRENT);

    // Get the AlarmManager service
    AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
    am.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), sender);

     return null;
}

}

但是在编译时出现了 3 个错误:

1. AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE); 原因:

   ALARM_SERVICE cannot be resolved to a variable alarm.java

2. Intent intent = new Intent(ctx, AlarmReciever.class); 原因:

   The constructor Intent(CordovaInterface, Class) is undefined alarm.java

3. PendingIntent sender = PendingIntent.getBroadcast(this, 192837, intent, PendingIntent.FLAG_UPDATE_CURRENT); 原因:

   The method getBroadcast(Context, int, Intent, int) in the type PendingIntent is not applicable for the arguments (alarm, int, Intent, int) alarm.java`

我的接收器 Java 文件名为 AlarmReciever.java。

如果有人看到我做错了什么，我将不胜感激。

Answer 1

就像@shaish说的，首先要创建一个Context引用，这样你就可以进行Android操作了:。

Context context = cordova.getActivity().getApplicationContext();

使用上下文创建Intent，创建PendingIntent，获取系统服务。

Intent intent = new Intent(context, AlarmReciever.class);
...
PendingIntent sender = PendingIntent.getBroadcast(context, 192837, intent, PendingIntent.FLAG_UPDATE_CURRENT);
...
AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);

另一个问题是 AlarmReceiver 类。它应该扩展 BroadcastReceiver:

public class AlarmReceiver extends BroadcastReceiver {

    private static final String LOG_TAG = AlarmReceiver.class.getSimpleName();

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d(LOG_TAG, "onReceive()");
    }
}

并且你需要把它放到AndroidManifest.xml中:

    <application>
        ...
        <receiver android:name="de.ma.AlarmReceiver"/>
    </application>

作为 BroadcastReceiver 的替代方案，如果 AlarmReceiver 是一个 Activity，您可以只使用:

PendingIntent sender = PendingIntent.getActivity(context, 192837, intent, PendingIntent.FLAG_UPDATE_CURRENT);

它直接启动您的 Activity。