java - 每 5 秒更新一次 Android 小部件

Question

我刚开始学习 Android，我按照教程编写了以下代码。

如果单击它，这将更新文本区域，但我想每 30 秒更新一次。我该怎么做？

我想测量我的脉搏并通过蓝牙发送数据。如果我的脉搏高于小部件警告我(声音)。管理此问题的最佳方法是什么，我想每 15 秒检查一次。什么是最有效的方法？

package com.test;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

import com.test.R;

import android.app.PendingIntent;
import android.app.Service;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
import android.widget.RemoteViews;
import android.widget.Toast;

public class WidgetActivity extends AppWidgetProvider {
    public static WidgetActivity Widgetke = null;
    public static Context context;
    public static AppWidgetManager appWidgetManager;
    public static int appWidgetIds[];   

    @Override
    public void onUpdate( Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds )    {     
        if (null == context) context = WidgetActivity.context;
        if (null == appWidgetManager) appWidgetManager = WidgetActivity.appWidgetManager;
        if (null == appWidgetIds) appWidgetIds = WidgetActivity.appWidgetIds;

        WidgetActivity.Widgetke = this;
        WidgetActivity.context = context;
        WidgetActivity.appWidgetManager = appWidgetManager;
        WidgetActivity.appWidgetIds = appWidgetIds;

        Log.i("PXR", "onUpdate");

        final int N = appWidgetIds.length;
        for (int i=0; i<N; i++) {
            int appWidgetId = appWidgetIds[i];  

            updateAppWidget(context,appWidgetManager, appWidgetId);            
        }

    }


    static void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
            int appWidgetId) {

        DateFormat format = SimpleDateFormat.getTimeInstance( SimpleDateFormat.MEDIUM, Locale.getDefault() );
        CharSequence text = "Time: " + format.format( new Date());

        Intent intent = new Intent(context, UpdateService.class);
        PendingIntent pendingIntent = PendingIntent.getService(context, 0, intent, 0);

        RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget);
        remoteViews.setOnClickPendingIntent(R.id.mainlayout, pendingIntent);

        remoteViews.setTextViewText(R.id.test_out, text);

        // Tell the widget manager
        appWidgetManager.updateAppWidget(appWidgetId, remoteViews);
    }

    public static class UpdateService extends Service {
        @Override
        public void onStart(Intent intent, int startId) {
            WidgetActivity.Widgetke.onUpdate(context, appWidgetManager, appWidgetIds);
            Toast.makeText(context, "Update Widget", Toast.LENGTH_SHORT).show();
        }

        @Override
        public IBinder onBind(Intent arg0) {
            return null;
        }
    }

}

Answer 1

您可以启动一个新线程并使用 for(;;) 循环 hibernate 。您可以从那里使用处理程序 (android.os.Handler) 更新 UI:http://www.mopri.de/2010/timertask-bad-do-it-the-android-way-use-a-handler/

或者，use a timer .