如何安排Android以后的意图?

时间:2015-07-15 11:51:58

标签: android broadcastreceiver scheduled-tasks android-broadcast

我刚刚开始Android开发并遇到了这个问题。我试图在特定时间后开始一个意图。

  1. 我尝试将Intent放在Runnable中,使用runnable和handler.postAtTime方法。当您销毁应用程序或重新启动手机时,此方法不执行任何操作。

  2. 我尝试设置一个BroadcastReceiver,但它不允许我对Intent使用startActivity(Intent)。我尝试使用Context.startActivity(Intent),但如果它在Intent完成之前被销毁,它会使应用停止工作。

  3. 任何人都能帮助我吗?感谢。

    Edit1:

    这是我使用AlarmManager调用的BroadcastReceiver:

    package com.mallock.sch_email2;
    
    import android.content.BroadcastReceiver;
    import android.content.Context;
    import android.content.Intent;
    import android.net.Uri;
    import android.widget.Toast;
    
    public class Broadcast extends BroadcastReceiver{
        @Override
        public void onReceive(Context arg0, Intent arg1) {
            Intent intent = new Intent(Intent.ACTION_SENDTO); 
            intent.setType("text/plain");
            intent.putExtra(Intent.EXTRA_SUBJECT, Activity1.subj);
            intent.putExtra(Intent.EXTRA_TEXT, Activity1.body);
            intent.setData(Uri.parse("mailto:".concat(Activity1.rec)));
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(arg0,intent);
            Toast.makeText(arg0, "I'm running", Toast.LENGTH_SHORT).show();
        }
    }
    

    logcat:

    07-15 21:43:13.980    4569-4569/com.mallock.sch_email2 E/AndroidRuntime﹕ FATAL EXCEPTION: main
        Process: com.mallock.sch_email2, PID: 4569
        java.lang.RuntimeException: Unable to start receiver com.mallock.sch_email2.Broadcast: java.lang.NullPointerException
                at android.app.ActivityThread.handleReceiver(ActivityThread.java:2580)
                at android.app.ActivityThread.access$1700(ActivityThread.java:151)
                at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
                at android.os.Handler.dispatchMessage(Handler.java:110)
                at android.os.Looper.loop(Looper.java:193)
                at android.app.ActivityThread.main(ActivityThread.java:5292)
                at java.lang.reflect.Method.invokeNative(Native Method)
                at java.lang.reflect.Method.invoke(Method.java:515)
                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
                at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
                at dalvik.system.NativeStart.main(Native Method)
         Caused by: java.lang.NullPointerException
                at java.lang.String.concat(String.java:678)
                at com.mallock.sch_email2.Broadcast.onReceive(Broadcast.java:16)
                at android.app.ActivityThread.handleReceiver(ActivityThread.java:2573)
                at android.app.ActivityThread.access$1700(ActivityThread.java:151)
                at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
                at android.os.Handler.dispatchMessage(Handler.java:110)
                at android.os.Looper.loop(Looper.java:193)
                at android.app.ActivityThread.main(ActivityThread.java:5292)
                at java.lang.reflect.Method.invokeNative(Native Method)
                at java.lang.reflect.Method.invoke(Method.java:515)
                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
                at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
                at dalvik.system.NativeStart.main(Native Method)
    

2 个答案:

答案 0 :(得分:1)

class适合您! AlarmManager是正确的方法。

答案 1 :(得分:0)

我正在使用PendingIntent.getBroadcast,然后使用BroadcastReceiver启动一个Intent。直接使用PendingIntent.getActivity解决了这个问题。

@Mimmo Grottoli:正确......谢谢:)