Android6.0添加桌面插件Widget
分析了Widgets源码，那么如何添加自己定义的widgets插件呢？先把效果图附上
一、步骤:
1、设计组件UI:widget_music.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
>
<Button
android:id="@+id/button"
android:layout_width="100dp"
android:layout_height="60dp"
android:textColor="#ffffff"
android:textSize="18dp"
android:gravity="center"
android:text="@string/music_widget"
android:background="#00E3E3"
/>
LinearLayout>2、设置UI容器：appwidget_music_info.xml
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
android:minWidth="200dip"
android:minHeight="60dip"
android:updatePeriodMillis="0"
android:initialLayout="@layout/music_widget"
>
appwidget-provider>3、写个类继承AppWidgetProvider(MusicWidgetProvider.java)
package com.android.music;
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.content.res.Resources;
import android.view.View;
import android.widget.RemoteViews;
import com.android.music.R;
public class MusicWidgetProvider extends AppWidgetProvider{
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
// Update each requested appWidgetId
RemoteViews view = buildUpdate(context);
for (int i = 0; i < appWidgetIds.length; i++) {
appWidgetManager.updateAppWidget(appWidgetIds[i], view);
}
}
static RemoteViews buildUpdate(Context context) {
RemoteViews views = new RemoteViews(context.getPackageName(),R.layout.music_widget);
Intent intent = new Intent(context,MusicBrowserActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context,
0 /* no requestCode */, intent, 0 /* no flags */);
views.setOnClickPendingIntent(R.id.button, pendingIntent);
return views;
}
public void onEnabled(Context context) {
//super.onEnabled();
}
public void onDisabled(Context context) {
//super.onDisabled();
}
}4、在Manifest.xml中注册receiver;
<receiver android:name="com.android.music.MusicWidgetProvider">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
<action android:name="android.appwidget.action.APPWIDGET_DISABLED"/>
<action android:name="android.appwidget.action.APPWIDGET_ENABLED"/>
intent-filter>
<meta-data android:name="android.appwidget.provider" android:resource="@xml/appwidget_music_info" />
receiver>二、编译结束后遇到的bug:把widget插件拖到桌面的时候组件没法正常显示，提示Problem loading widget。
打印的日志如下：
01-01 08:08:25.607 1802-1802/? W/AppWidgetHostView: updateAppWidget couldn't find any view, using error viewandroid.view.InflateException: Binary XML file line #8: Binary XML file line #8: You must supply a layout_width attribute.
at android.view.LayoutInflater.inflate(LayoutInflater.java:539)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.widget.RemoteViews.apply(RemoteViews.java:2762)
at android.appwidget.AppWidgetHostView.updateAppWidget(AppWidgetHostView.java:393)
at com.android.launcher3.LauncherAppWidgetHostView.updateAppWidget(LauncherAppWidgetHostView.java:69)
at android.appwidget.AppWidgetHost.createView(AppWidgetHost.java:349)
at com.android.launcher3.LauncherAppWidgetHost.createView(LauncherAppWidgetHost.java:118)
at com.android.launcher3.widget.WidgetHostViewLoader$2.run(WidgetHostViewLoader.java:106)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5452)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:762)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)
Caused by: java.lang.UnsupportedOperationException: Binary XML file line #8: You must supply a layout_width attribute.
at android.content.res.TypedArray.getLayoutDimension(TypedArray.java:709)
at android.view.ViewGroup$LayoutParams.setBaseAttributes(ViewGroup.java:6923)
at android.view.ViewGroup$MarginLayoutParams.(ViewGroup.java:7105)
at android.widget.LinearLayout$LayoutParams.(LinearLayout.java:1911)
at android.widget.LinearLayout.generateLayoutParams(LinearLayout.java:1816)
at android.widget.LinearLayout.generateLayoutParams(LinearLayout.java:1815)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:837)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.widget.RemoteViews.apply(RemoteViews.java:2762)
at android.appwidget.AppWidgetHostView.updateAppWidget(AppWidgetHostView.java:393)
at com.android.launcher3.LauncherAppWidgetHostView.updateAppWidget(LauncherAppWidgetHostView.java:69)
at android.appwidget.AppWidgetHost.createView(AppWidgetHost.java:349)
at com.android.launcher3.LauncherAppWidgetHost.createView(LauncherAppWidgetHost.java:118)
at com.android.launcher3.widget.WidgetHostViewLoader$2.run(WidgetHostViewLoader.java:106)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5452)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:762)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)
[ 01-01 08:08:26.195 4790: 4790 E/ ]
memsic Open mxc400x device failed! fd_acc = -1
01-01 08:08:26.566 1141-1469/? W/BackupManagerService: dataChanged but no participant pkg='com.android.launcher3' uid=10032
01-01 08:08:26.859 1141-4333/? W/BackupManagerService: dataChanged but no participant pkg='com.android.launcher3' uid=10032 哈哈，犯了个低级错误，没有定义layout_width属性，导致引入的xml出错，修改之后就可以正常显示了