Load another application's resource like RemoteView do, just for fun!
通过包名和资源名即可加载到其他应用的资源，仅用于学习RemoteView远程加载布局，复杂布局下存在很多兼容性问题。
1.根据包名创建可以加载到其他应用资源的Context
InflaterContext inflaterContext = new InflaterContext(this, "pw.qlm.otherapp");2.根据上面Context创建LayoutInflater
LayoutInflater layoutInflater = LayoutInflater.from(inflaterContext);3.获取其他应用的资源id
int layoutId = inflaterContext.getResources().getIdentifier("activity_main", "layout", inflaterContext.getPackageName());4.根据资源id加载布局
View view = layoutInflater.inflate(layoutId, (ViewGroup) getWindow().getDecorView(), false);一个普通应用(otherApp.apk)，布局里包括一行文字，和一张图片；其中文字部分使用了自定义View(MyTextView extends TextView),图片对应ImageView。
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="pw.qlm.otherapp.MainActivity">
<pw.qlm.otherapp.MyTextView
android:id="@+id/mtv"
android:padding="10dp"
android:textSize="18sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="This layout is from other app"/>
<ImageView
android:layout_below="@id/mtv"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/cat"/>
</RelativeLayout>
另一个应用（RemoteInflater App），根据使用步骤中的代码加载OtherAPP中的布局（包括其中的资源，自定义View）
public InflaterContext(Context base, String packageName) {
super(base);
//关键1.根据包名创建可以读取对方资源的Context
contextForResources = ApplicationUtil.createApplicationContext(base, packageName);
//关键2.使用该ContextWrapper克隆LayoutInflater
inflater = LayoutInflater.from(base).cloneInContext(this);
//关键3.若布局中用到了自定义View，需要使用该ClassLoader
mClassLoader = new DexClassLoader(ApplicationUtil.getApkPath(contextForResources), getDir("dex", 0).getAbsolutePath(), getDir("so", 0).getAbsolutePath(), super.getClassLoader());
} public View apply(Context context, ViewGroup parent, OnClickHandler handler) {
RemoteViews rvToApply = getRemoteViewsToApply(context);
View result;
// RemoteViews may be built by an application installed in another
// user. So build a context that loads resources from that user but
// still returns the current users userId so settings like data / time formats
// are loaded without requiring cross user persmissions.
final Context contextForResources = getContextForResources(context);
Context inflationContext = new ContextWrapper(context) {
@Override
public Resources getResources() {
return contextForResources.getResources();
}
@Override
public Resources.Theme getTheme() {
return contextForResources.getTheme();
}
@Override
public String getPackageName() {
return contextForResources.getPackageName();
}
};
LayoutInflater inflater = (LayoutInflater)
context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// Clone inflater so we load resources from correct context and
// we don't add a filter to the static version returned by getSystemService.
inflater = inflater.cloneInContext(inflationContext);
inflater.setFilter(this);
result = inflater.inflate(rvToApply.getLayoutId(), parent, false);
rvToApply.performApply(result, parent, handler);
return result;
}
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