Question

嗨我想在5分钟后在后台应用时将通知发送给用户执行应用程序。所以，我使用onWindowFocusChanged检查我的应用程序是否为背景。请帮帮我，我该怎么办。这是我的代码。请用完整的代码回答我。我想通过弹出菜单通知他们。

MainActivity.java

package com.myapp;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.content.Intent;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
.............//import is too long
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.myapp.R;
public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);

       setContentView(R.layout.main);


        Button btnA = (Button)findViewById(R.id.btngetA);
             btnA.setOnClickListener(new Button.OnClickListener(){
            @Override
            public void onClick(View v){
                //TODO Auto-generated method stub
                Intent intentA = new Intent(getApplicationContext(), gotoAActivity.class);

                startActivity(intentA);

            }
        });
        @Override
        public void onWindowFocusChanged(boolean hasFocus) {
            if (!hasFocus) {
                new CountDownTimer(1000, 1) {
                    public void onTick(long millisUntilFinished) {

                    }

                    public void onFinish() {
                //timer finished

                    }

                }.start();

            }
            super.onWindowFocusChanged(hasFocus);
        }

这是通知。但我不知道这些代码应该添加到哪里..

 public static void createService(Context context, CharSequence tickerMessage, CharSequence title,
            CharSequence message, int icon, int id, Intent intent, long[] pattern, Boolean autoCancel) {
        PendingIntent p = PendingIntent.getService(context, 0, intent, 0);
        Notification n;
        title="notice";
        message="execute your app!!";

        int apiLevel = Build.VERSION.SDK_INT;


        if (apiLevel >= 11) {

            NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
            .setContentTitle(title)
            .setTicker(tickerMessage)
            .setContentText(message)
            .setSmallIcon(icon)
            .setContentIntent(p)
            .setPriority(NotificationCompat.PRIORITY_DEFAULT);


            if (pattern.length > 0) {
                builder.setVibrate(pattern);
                }

            if (autoCancel != null) {
                builder.setAutoCancel(autoCancel);
            }

            if (apiLevel >= 17) {
                // Android 4.2+
                n = builder.build();
            }

            else {
                // Android 3.x
                n = builder.getNotification();
            }
        }
        else {
            // Android 2.2+
            n = new Notification(icon, tickerMessage, System.currentTimeMillis());
            // Data
            n.setLatestEventInfo(context, title, message, p);
        }

        NotificationManager nm = (NotificationManager)
                context.getSystemService(Activity.NOTIFICATION_SERVICE);
        nm.notify(id, n);
    }

Answer 1

您应该使用onFinish()方法发送通知，但说实话，此代码根本不起作用。如果你的活动在后台，可以随时被操作系统杀死。您可以做的是在活动的onStop()回调中设置5分钟的闹钟，并在onStart()回调中将其删除。这样，如果5分钟后没有启动活动，您可以根据计时器到期时的操作进行一些工作。

如何在一段时间后发出通知

1 个答案: