在AppWidgetProvider实现CountDownTimer [英] Implement CountDownTimer in a AppWidgetProvider

问题描述

我要实现在一个窗口小部件CountDownTimer。我想出了是：

 进口android.content.Intent;
进口android.os.CountDownTimer;
进口android.widget.RemoteViews;
进口android.widget.TextView;公共类倒计时扩展CountDownTimer {
    私人RemoteViews意见;    公共COUNTDOWN（长millisInFuture，诠释countDownInterval，RemoteViews意见）{
        超（mil​​lisInFuture，countDownInterval）;        this.views =意见;
    }    @覆盖
    公共无效onFinish（）{
    }    @覆盖
    公共无效onTick（长millisUntilFinished）{
        INT天数=（INT）（millisUntilFinished /（1000 * 60 * 60 * 24））;            views.setTextViewText（R.id.countWidget，天）;
    }
}
 

而AppWidgetProvider类

 进口java.util.Calendar中;
进口java.util.Date;
进口java.util.TimeZone中;进口android.app.PendingIntent;
进口android.appwidget.AppWidgetManager;
进口android.appwidget.AppWidgetProvider;
进口android.content.Context;
进口android.content.Intent;
进口android.widget.RemoteViews;
进口android.widget.TextView;公共类CountDownWidgetProvider扩展AppWidgetProvider {
    私人日历的currentdate = Calendar.getInstance（）;
    私人日历firstDecember = Calendar.getInstance（）;    公共无效的onUpdate（上下文的背景下，AppWidgetManager appWidgetManager，INT [] appWidgetIds）{
        日期日期=新的日期（）;        this.firstDecember.setTimeZone（TimeZone.getTimeZone（欧洲/柏林））;
        this.currentDate.setTimeZone（TimeZone.getTimeZone（欧洲/柏林））;
        this.firstDecember.set（2012，11，1，0，0，0）; // TODO：设置为月
        this.currentDate.setTime（日期）;        最终诠释N = appWidgetIds.length;        //执行的每个应用程序窗口小部件属于此提供这一循环过程
        的for（int i = 0; I＆LT; N;我++）{
            INT appWidgetId = appWidgetIds [I]            //创建一个Intent推出MainActivity
            意向意图=新意图（背景下，MainActivity.class）;
            的PendingIntent的PendingIntent = PendingIntent.getActivity（上下文，0，意图，0）;            //获取为App插件的布局并附加上单击监听器
            //到按钮
            RemoteViews意见=新的RemoteViews（context.getPackageName（），R.layout.count_down_app_widget）;
            views.setOnClickPendingIntent（R.id.countWidget，的PendingIntent）;            长米利斯= this.firstDecember.getTimeInMillis（） -  this.currentDate.getTimeInMillis（）;            倒计时countDown方法=新COUNTDOWN（米利斯，1000，意见）;
            countDown.start（）;            //告诉AppWidgetManager对当前应用程序窗口小部件进行更新
            appWidgetManager.updateAppWidget（appWidgetId，意见）;
        }
    }
}
 

但它不工作的方式。窗口小部件的TextView不刷新，甚至改变。这似乎是倒数不会启动。

也许我犯了一个错误的地方，但我是新的android开发，所以我想你能帮助我。

解决方案

 你必须设置文本部件后更新
使用
 appWidgetManager.updateAppWidget（appWidgetId，意见）;
 后
  views.setTextViewText（R.id.countWidget，天）;
 

I want to implement a CountDownTimer in a widget. What I came up with is:

import android.content.Intent;
import android.os.CountDownTimer;
import android.widget.RemoteViews;
import android.widget.TextView;

public class CountDown extends CountDownTimer {
    private RemoteViews views;

    public CountDown(long millisInFuture, int countDownInterval, RemoteViews views) {
        super(millisInFuture, countDownInterval);

        this.views = views;
    }

    @Override
    public void onFinish() {
    }

    @Override
    public void onTick(long millisUntilFinished) {
        int days = (int) (millisUntilFinished / (1000 * 60 * 60 * 24));

            views.setTextViewText(R.id.countWidget, days);
    }
}

And the AppWidgetProvider class

import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.widget.RemoteViews;
import android.widget.TextView;

public class CountDownWidgetProvider extends AppWidgetProvider {
    private Calendar currentDate = Calendar.getInstance();
    private Calendar firstDecember = Calendar.getInstance();

    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        Date date = new Date();

        this.firstDecember.setTimeZone(TimeZone.getTimeZone("Europe/Berlin"));
        this.currentDate.setTimeZone(TimeZone.getTimeZone("Europe/Berlin"));
        this.firstDecember.set(2012, 11, 1, 0, 0, 0); // TODO: Set to December
        this.currentDate.setTime(date);

        final int N = appWidgetIds.length;

        // Perform this loop procedure for each App Widget that belongs to this provider
        for (int i=0; i<N; i++) {
            int appWidgetId = appWidgetIds[i];

            // Create an Intent to launch MainActivity
            Intent intent = new Intent(context, MainActivity.class);
            PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);

            // Get the layout for the App Widget and attach an on-click listener
            // to the button
            RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.count_down_app_widget);
            views.setOnClickPendingIntent(R.id.countWidget, pendingIntent);

            long millis = this.firstDecember.getTimeInMillis() - this.currentDate.getTimeInMillis();

            CountDown countDown = new CountDown(millis, 1000, views);
            countDown.start();

            // Tell the AppWidgetManager to perform an update on the current app widget
            appWidgetManager.updateAppWidget(appWidgetId, views);
        }
    }
}

But it does not work that way. The widgets TextView does not refresh or even change. It seems like the CountDown does not start.

Maybe I made a mistake somewhere, but I'm new to android development, so I thought you could help me out.

解决方案

you have to update widget after setting the text
use 
 appWidgetManager.updateAppWidget(appWidgetId, views);


 after
  views.setTextViewText(R.id.countWidget, days);

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