一、需要一个加载我们需要自定义view的容器,具有RemoteView的属性,这个容器的代码如下:
package android.widget;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.res.AssetManager;
import android.content.res.Resources;
import android.os.Binder;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.view.InflateException;
import android.view.LayoutInflater;
import android.view.RemotableViewMethod;
import android.view.View;
import android.widget.RemoteViews.RemoteView;
import java.io.File;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import dalvik.system.DexClassLoader;
@RemoteView
public class ThemeLayout extends FrameLayout {
private static final String TAG = "ThemeLayout";
private String mCurrentTheme = null;
public ThemeLayout(Context context) {
super(context);
}
public ThemeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ThemeLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@RemotableViewMethod
public void setThemePath(String themePath) {
if (TextUtils.isEmpty(themePath)) {
Log.e(TAG, "theme path is empty!!!");
return;
}
File file = new File(themePath);
if (!file.exists()) {
Log.e(TAG, "theme file is not exist!!!");
return;
}
if (themePath.equals(mCurrentTheme)) {
return;
}
long token = Binder.clearCallingIdentity();
Context theme = new ExternalContext(getContext(), themePath);
View childView = applyTheme(theme);
if (childView != null) {
removeAllViews();
addView(childView);
mCurrentTheme = themePath;
}
Binder.restoreCallingIdentity(token);
}
private View applyTheme(Context context) {
try {
Class cls = context.getClassLoader().loadClass("com.test.utils.DexUtils");
Object object = cls.newInstance();
Method method = cls.getMethod("getWidgetLayoutId");
int layoutId = (int) method.invoke(object);
if (layoutId > 0) {
return LayoutInflater.from(getContext()).cloneInContext(context).inflate(layoutId, null);
} else {
Log.v(TAG, "layout is not exists");
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (Resources.NotFoundException e) {
e.printStackTrace();
} catch (InflateException e) {
e.printStackTrace();
}
return null;
}
private static class ExternalContext extends ContextWrapper {
private Resources mThemeResource;
private DexClassLoader mThemeClassLoader;
private Resources.Theme mTheme;
public ExternalContext(Context base, String themePath) {
super(base);
mThemeClassLoader = new DexClassLoader(themePath, getDir("dex", MODE_PRIVATE).getAbsolutePath(), null, getClassLoader());
AssetManager assetManager = new AssetManager();
assetManager.addAssetPath(themePath);
mThemeResource = new Resources(assetManager, super.getResources().getDisplayMetrics(), super.getResources().getConfiguration());
}
@Override
public Resources getResources() {
return mThemeResource;
}
@Override
public ClassLoader getClassLoader() {
return mThemeClassLoader;
}
@Override
public Resources.Theme getTheme() {
if (mTheme == null) {
mTheme = mThemeResource.newTheme();
mTheme.setTo(super.getTheme());
}
return mTheme;
}
public void close() {
mThemeResource.getAssets().close();
}
}
}
容器代码很简单,需要注意的是Class cls = context.getClassLoader().loadClass("com.test.utils.DexUtils"); DexUtils.java这个类就是用于加载view的入口,会在widget中实现。
接下来需要编译framework,因增加了一个新的view,需要到源码根目录执行make update-api命令,再到framework/base/core目录进行编译,使用mm或者mma命令即可。
二、新建一个widget项目
1、WidgetTest.java的代码如下:
package com.test.widgettest;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.widget.RemoteViews;
/**
* Created by Andre.Ou on 2018/12/6.
*/
public class WidgetTest extends AppWidgetProvider {
@Override
public void onReceive(Context context, Intent intent) {
super.onReceive(context, intent);
}
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
super.onUpdate(context, appWidgetManager, appWidgetIds);
RemoteViews views = loadRemoteVies(context);
if (appWidgetIds != null) {
appWidgetManager.updateAppWidget(appWidgetIds, views);
} else {
appWidgetManager.updateAppWidget(new ComponentName(context, WidgetTest.class), views);
}
}
private RemoteViews loadRemoteVies(Context context) {
String packagePath = context.getPackageResourcePath();//应用自身的路径
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
views.setString(R.id.themeLayout, "setThemePath", packagePath);
return views;
}
}
widget部分主要是将要加载的view所在apk路径通过容器ThemeLayout的setThemePath方法传入,进而加载到容器中
2、widget_layout.xml布局文件如下:
调用容器ThemeLayout的布局、
三、容器访问自定义view的入口
1、定义DexUtils.java类作为入口,代码如下:
package com.test.utils;
import com.test.widgettest.R;
public class DexUtils {
public int getWidgetLayoutId() {
return R.layout.cust_layout;
}
}
cust_layout.xml里面就可以放你任意的自定义view了。
2、cust_layout.xml实例:
功能已完成,有不明白的小伙伴请留言。