Question

在我的第一个Android应用程序上工作，所以我是一个完整的菜鸟所以我可能犯了一个愚蠢的错误，但我无法定期更新通知文本。如果我重新点击切换按钮，它会工作，但我希望通知在周数已更改时自动更新并以静默方式刷新通知。包含我的代码片段，感谢您提前获得的帮助。

import android.app.NotificationManager;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.app.NotificationCompat;
import android.util.Log;
import android.os.Handler;
import android.widget.CompoundButton;
import android.widget.ToggleButton;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MyActivity";


    public void createNotification() {

       final Calendar now = Calendar.getInstance();
       now.get(Calendar.WEEK_OF_YEAR);

       int weekId = 1;
       final NotificationCompat.Builder nBuilder = (NotificationCompat.Builder) new NotificationCompat.Builder(this)
               .setContentTitle("Week")
               .setContentText(""+now.get(Calendar.WEEK_OF_YEAR))
               .setSmallIcon(R.drawable.ic_stat_name);
       final NotificationManager NM = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
       NM.notify(weekId, nBuilder.build());

    }

    // Init
    private Handler handler = new Handler();
    private Runnable runnable = new Runnable() {
        @Override
        public void run() {
            createNotification();
            Log.i(TAG, "updated");
            handler.postDelayed(runnable,1000);
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ToggleButton toggle = (ToggleButton) findViewById(R.id.toggleButton);
        toggle.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    // The toggle is enabled
                    createNotification();
                } else {
                    // The toggle is disabled
                    NotificationManager NM = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
                    NM.cancelAll();
                }
            }
        });
    }


}

Answer 1

永远不会调用

handler.postDelayed(runnable,1000)，因为永远不会调用run()。尝试将handler.postDelayed(runnable,1000)添加到您的＆＃39; onCreate（）＆＃39;让球滚动。

Answer 2

这有效：

if (isChecked) {
    // The toggle is enabled
    handler.postDelayed(runnable,1000);
} else {
    // The toggle is disabled
    NotificationManager NM = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    NM.cancel(1);
}

Android通知更新定期无效（处理程序问题？）

2 个答案: