转 android 动态加载插件模型开发-白红宇

转 android 动态加载插件模型开发

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发布时间：2019-06-09

本文共 5841 字，大约阅读时间需要 19 分钟。

目前市面上的应用商店，不管是 apple 还是 android 平台，一般只有一家商店。

如果要动态添加商店，允许多家商店共存。

搭建一个平台，多家应用商店可以加入。

类似于商场与专卖店的关系。

每个商店的业务由各自实现，但统一由商场来提供接口供用户选择。

下面就来简单做个原型：

1 ClassLoadTestMain 商场

2 ClassLoadTestPlugin 商店

3 PluginInterface 商场提供给商店的接口

接口定义：

package com.pathfindeng.android.test;

public interface IPlugin {

public int add(int a, int b);

}

package com.pathfindeng.android.test; public interface IPlugin { public int add(int a, int b); }

商店实现接口：

package com.pathfindeng.android.test.plugin;

import com.pathfindeng.android.test.IPlugin;

public class Plugin implements IPlugin{

public int add(int a, int b){

return a + b;

}

}

package com.pathfindeng.android.test.plugin; import com.pathfindeng.android.test.IPlugin; public class Plugin implements IPlugin{ public int add(int a, int b){ return a + b; } }

商场调用商店的实现：

package com.pathfindeng.android.test.main;

import com.pathfindeng.android.test.IPlugin;

import com.pathfindeng.android.test.main.R;

import dalvik.system.DexClassLoader;

import dalvik.system.VMStack;

import android.app.Activity;

import android.os.Bundle;

import android.widget.TextView;

import android.widget.Toast;

public class ClassLoadTestMainActivity extends Activity {

TextView result;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

result = (TextView)findViewById(R.id.result);

}

public void doInPlugin(){

String dexPath, dexOutputDir, libPath ,className;

ClassLoader parent;

dexPath = "/data/app/com.pathfindeng.android.test.plugin-1.apk";

dexOutputDir = "/data/data/com.pathfindeng.android.test.main";

libPath = "/data/data/com.pathfindeng.android.test.main/lib";

parent = ClassLoadTestMainActivity.this.getClassLoader();

//parent = VMStack.getCallingClassLoader();

DexClassLoader mDexClassLoader = new DexClassLoader(dexPath, dexOutputDir, libPath, parent);

className = "com.pathfindeng.android.test.plugin.Plugin";

try {

Class mClass = mDexClassLoader.loadClass(className);

IPlugin mIPlugin = (IPlugin)mClass.newInstance();

int c;

c = mIPlugin.add(100, 200);

result.setText("from plugin : "+c);

Toast.makeText(ClassLoadTestMainActivity.this, "from plugin : "+c, Toast.LENGTH_LONG);

} catch (ClassNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IllegalAccessException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (InstantiationException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

/* (non-Javadoc)

* @see android.app.Activity#onResume()

@Override

protected void onResume() {

// TODO Auto-generated method stub

super.onResume();

doInPlugin();

}

/* (non-Javadoc)

* @see android.app.Activity#onDestroy()

@Override

protected void onDestroy() {

// TODO Auto-generated method stub

super.onDestroy();

}

}

package com.pathfindeng.android.test.main; import com.pathfindeng.android.test.IPlugin; import com.pathfindeng.android.test.main.R; import dalvik.system.DexClassLoader; import dalvik.system.VMStack; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; import android.widget.Toast; public class ClassLoadTestMainActivity extends Activity { TextView result; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); result = (TextView)findViewById(R.id.result); } public void doInPlugin(){ String dexPath, dexOutputDir, libPath ,className; ClassLoader parent; dexPath = "/data/app/com.pathfindeng.android.test.plugin-1.apk"; dexOutputDir = "/data/data/com.pathfindeng.android.test.main"; libPath = "/data/data/com.pathfindeng.android.test.main/lib"; parent = ClassLoadTestMainActivity.this.getClassLoader(); //parent = VMStack.getCallingClassLoader(); DexClassLoader mDexClassLoader = new DexClassLoader(dexPath, dexOutputDir, libPath, parent); className = "com.pathfindeng.android.test.plugin.Plugin"; try { Class mClass = mDexClassLoader.loadClass(className); IPlugin mIPlugin = (IPlugin)mClass.newInstance(); int c; c = mIPlugin.add(100, 200); result.setText("from plugin : "+c); Toast.makeText(ClassLoadTestMainActivity.this, "from plugin : "+c, Toast.LENGTH_LONG); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (InstantiationException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /* (non-Javadoc) * @see android.app.Activity#onResume() */ @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); doInPlugin(); } /* (non-Javadoc) * @see android.app.Activity#onDestroy() */ @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); } }

从上面的代码看，调用插件还是强制定义的，不够人性

接下来做些改进。

插件端注册固定 Action Name

<activity android:name=".商店Activity" android:label="@string/app_name">

<intent-filter>

<action android:name="接口指定固定 Action Name" />

</intent-filter>

</activity>

服务器端商场

利用 PackageManager 查询所有注册了接口定义的 Action Name 的商店，并获得信息。

Intent intent = new Intent(Constants.ACTION_PLUGIN, null);

PackageManager pm = mContext.getPackageManager();

List<ResolveInfo> plugins = pm.queryIntentActivities(intent, 0);

Intent intent = new Intent(Constants.ACTION_PLUGIN, null); PackageManager pm = mContext.getPackageManager(); List<ResolveInfo> plugins = pm.queryIntentActivities(intent, 0);

这样之前提到的