如何从小部件的按钮调用类

Posted 2023-04-15

【中文标题】如何从小部件的按钮调用类

【英文标题】：How to call classes from a button from a widget

【发布时间】：2014-06-16 23:53:37

【问题描述】：

我的小部件中有两个按钮，我想调用两个不同的类。这是我的代码示例

    package com.example.test;


import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;

import android.annotation.SuppressLint;
import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;

//import android.text.format.DateFormat;
import android.util.Log;
//import android.view.View;
//import android.view.View.OnClickListener;

//import android.widget.Button;
//import android.widget.LinearLayout;
import android.widget.RemoteViews;

@SuppressLint("SimpleDateFormat")
public class MainActivity extends AppWidgetProvider 
      SimpleDateFormat df = new SimpleDateFormat("hh:mm:ss");

      public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) 
        final int N = appWidgetIds.length;



       // Log.i("ExampleWidget",  "Updating widgets " + Arrays.asList(appWidgetIds));

        // 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 ExampleActivity
          Intent intent = new Intent(context, SecondClass.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.activity_main);
          views.setOnClickPendingIntent(R.id.button1, pendingIntent);

          Intent intent1 = new Intent(context, ThirdClass.class);
          PendingIntent pending = PendingIntent.getActivity(context, 0, intent1, 0);

          RemoteViews views1 = new RemoteViews(context.getPackageName(), R.layout.activity_main);
          views1.setOnClickPendingIntent(R.id.button2, pending);  

         appWidgetManager.updateAppWidget(appWidgetId, views);
         
       
    

清单文件是

 <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.test"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.test.ThirdClass"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity
            android:name="com.example.test.SecondClass"
            android:label="@string/name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver android:name="com.example.test.MainActivity" android:label="8 test">
  <intent-filter>
        <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />

  </intent-filter>
  <meta-data android:name="android.appwidget.provider" android:resource="@xml/widget1_info" />
</receiver>
    </application>

</manifest>

当我按下 button1 时，会调用“SecondClass.class”，但按下 button2 时不会调用“ThirdClass.class”。有人能帮帮我吗。谢谢

【问题讨论】：

你为什么要创建views1？

非常感谢。有效。非常感谢。

【参考方案1】：

您已经创建了第二个 RemoteViews 对象（称为views1），并为它的一个视图提供了启动 ThirdClass 的 PendingIntent。但是当你更新 appwidget 时，你会给出第一个 RemoteViews（称为views）。显然这些不一样，因此您的小部件中没有 PendingIntent 可以转到 ThirdClass。

我想你想这样做：

int appWidgetId = appWidgetIds[i];

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

// Create an Intent to launch SecondClass 
Intent intent = new Intent(context, SecondClass.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
views.setOnClickPendingIntent(R.id.button1, pendingIntent);

// Create an Intent to launch ThirdClass
Intent intent1 = new Intent(context, ThirdClass.class);
PendingIntent pending = PendingIntent.getActivity(context, 0, intent1, 0);
views.setOnClickPendingIntent(R.id.button2, pending);  

appWidgetManager.updateAppWidget(appWidgetId, views);