我搜索了很多这个问题并尝试了互联网上提到的所有内容，但仍然找不到解决方案。我的小部件已安装，但单击时未更新。我还没有为它创建一个默认活动。我的问题是我点击按钮的动作没有改变。
这是我的代码：//Android清单
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.android.pictureapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="7"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<receiver android:name=".MyWidgetProvider" >
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>
<meta-data
android:name="android.appwidget.provider"
android:resource="@xml/widget_info" />
</receiver>
<receiver
android:name="MyWidgetIntentReceiver"
android:exported="false" >
<intent-filter>
<action android:name="com.example.android.intent.action.CHANGE_PICTURE" />
</intent-filter>
<meta-data
android:name="android.appwidget.provider"
android:resource="@xml/widget_info" />
</receiver>
</application>
</manifest>
//MyWidgetProvider.java- 此类包含 onUpdate 方法并具有侦听器。
package com.example.android.pictureapp;
import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.RemoteViews;
import com.example.android.pictureapp.R;
public class MyWidgetProvider extends AppWidgetProvider {
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,int[] appWidgetIds){
//Log.i("Tag","In onUpdate method");
System.out.println("Tag In onUpdate method");
RemoteViews views=new RemoteViews(context.getPackageName(),R.layout.widget_layout);
views.setOnClickPendingIntent(R.id.widget_button, buildButtonPendingIntent(context));
Log.i("Tag","Context value after setOnClickPI before pushWIDGET:"+context);
pushWidgetUpdate(context,views);
Log.i("Tag","after pushwidget update:"+context);
}
public static PendingIntent buildButtonPendingIntent(Context context){
Intent intent=new Intent();
intent.setAction("com.example.android.intent.action.CHANGE_PICTURE");
Log.i("Tag","intent's action:"+intent);
return PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
}
public static void pushWidgetUpdate(Context context,RemoteViews views){
System.out.println("Inside pushwidget");
ComponentName myWidget=new ComponentName(context, MyWidgetProvider.class);
AppWidgetManager manager=AppWidgetManager.getInstance(context);
manager.updateAppWidget(myWidget, views);
}
}
//MywidgetIntentReceiver.java - 这个类包含onReceive方法并执行点击后的功能。
package com.example.android.pictureapp;
import com.example.android.pictureapp.R;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.RemoteViews;
public class MyWidgetIntentReceiver extends BroadcastReceiver {
private static int clickCount = 0;
@Override
public void onReceive(Context context, Intent intent) {
// Log.i("Tag1","In onReceive:"+intent);
System.out.println("In onReceive()");
if (intent.getAction().equals(
"com.example.android.intent.action.CHANGE_PICTURE")) {
updateWidgetPictureAndButtonListener(context);
}
}
private void updateWidgetPictureAndButtonListener(Context context) {
RemoteViews views = new RemoteViews(context.getPackageName(),
R.layout.widget_layout);
views.setImageViewResource(R.id.widget_image, getImageToSet());
System.out.println("in updateWidgetPicture method");
// Log.i("Tag","in updaeWIdgetPicture method");
// remember to set ur button click listeners
views.setOnClickPendingIntent(R.id.widget_button,
MyWidgetProvider.buildButtonPendingIntent(context));
MyWidgetProvider.pushWidgetUpdate(context.getApplicationContext(),
views);
}
private int getImageToSet() {
clickCount++;
Log.i("Tag", "in getImageToSet()" + clickCount);
return clickCount % 2 == 0 ? R.drawable.paypal_logo : R.drawable.paypaldonation;
}
}
//布局/widget_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_margin="5sp"
>
<ImageView
android:id="@+id/widget_image"
android:layout_width="110dp"
android:layout_height="110dp"
android:layout_gravity="center"
android:src="@drawable/paypal_logo"
/>
<Button
android:id="@+id/widget_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Change it"
/>
</LinearLayout>
//xml/widget_info.xml
<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
android:minWidth="146dp"
android:minHeight="146dp"
android:updatePeriodMillis="5000"
android:initialLayout="@layout/widget_layout"
>
</appwidget-provider>
//主要活动
package com.example.android.pictureapp;
import com.example.android.pictureapp.R;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
//getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
这些是清单的变化：
<activity
android:name="com.example.android.pictureapp.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>