android插件化开发一

类加载器

DexClassLoader 加载sdcard目录下的apk或jar文件
PathClassLoader 加载路径必须在/data/app路径下

注意点

同一个Class = 相同的 ClassName + PackageName + ClassLoader
DexClassLoader构造参数需要一个父加载器, 在父加载器里找不到类时,再从子加载器里加载
DexClassLoader调用loadClass方法加载指定类

代码示例

加载apk里的一个类里的一个方法

插件apk

// package com.example.plug;
public class GetPlug {

    public int getAdd(int a, int b) {
        return a + b;
    }
}

// package com.example.plug;

public class GetPlug {

public int getAdd(int a, int b) {

return a + b;

}

主应用

        //DexClassLoader构造参数需要的父级加载器
        ClassLoader localClassLoader = ClassLoader.getSystemClassLoader();
        //要加载的文件所在的路径,DexClassLoader只能加载jar或apk文件
        String dexpath = Environment.getExternalStorageDirectory() + "/plug.apk";
        //加载的文件的要拷贝的文件夹, Context的getDir(String name, int mode)方法返回在data/data/下的dex文件,没有则创建
        File dexOutputDir = MainActivity.this.getDir("dex", 0);
        DexClassLoader localDexClassLoader = new DexClassLoader(dexpath, dexOutputDir.getAbsolutePath(), null, localClassLoader);

        try {
            // 调用加载器加载指定的类
            Class plugClass = localDexClassLoader.loadClass("com.example.plug.GetPlug");
            // 下面是反射到方法
            Object instance = plugClass.newInstance();
            Class[] params = new Class[2];
            params[0] = Integer.TYPE;
            params[1] = Integer.TYPE;
            Method method = plugClass.getMethod("getAdd", params);
            Integer i = (Integer) method.invoke(instance, 1, 2);

            showTextview.setText(i + "");

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        }

//DexClassLoader构造参数需要的父级加载器

ClassLoader localClassLoader = ClassLoader.getSystemClassLoader();

//要加载的文件所在的路径,DexClassLoader只能加载jar或apk文件

String dexpath = Environment.getExternalStorageDirectory() + "/plug.apk";

//加载的文件的要拷贝的文件夹, Context的getDir(String name, int mode)方法返回在data/data/下的dex文件,没有则创建

File dexOutputDir = MainActivity.this.getDir("dex", 0);

DexClassLoader localDexClassLoader = new DexClassLoader(dexpath, dexOutputDir.getAbsolutePath(), null, localClassLoader);

try {

// 调用加载器加载指定的类

Class plugClass = localDexClassLoader.loadClass("com.example.plug.GetPlug");

// 下面是反射到方法

Object instance = plugClass.newInstance();

Class[] params = new Class[2];

params[0] = Integer.TYPE;

params[1] = Integer.TYPE;

Method method = plugClass.getMethod("getAdd", params);

Integer i = (Integer) method.invoke(instance, 1, 2);

showTextview.setText(i + "");

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (NoSuchMethodException e) {

e.printStackTrace();

} catch (InvocationTargetException e) {

e.printStackTrace();

} catch (IllegalAccessException e) {

e.printStackTrace();

} catch (InstantiationException e) {

e.printStackTrace();

}

加载apk文件里的一个res资源

重新获取一个资源Resources


    /**
     * AssetManager mAssetManager = null;
     * Resources mResources;
     * String mDexPath; //apk文件路径
     * Resources.Theme mTheme;
     */
    protected void loadResources() {
        try {
            AssetManager assetManager = AssetManager.class.newInstance();
            Method addAssetPath = assetManager.getClass().getMethod("addAssetPath", String.class);
            addAssetPath.invoke(assetManager, mDexPath);
            mAssetManager = assetManager;
        } catch (Exception e) {
            e.printStackTrace();
        }
        Resources superRes = super.getResources();
        mResources = new Resources(mAssetManager, superRes.getDisplayMetrics(),
                superRes.getConfiguration());
        mTheme = mResources.newTheme();
        mTheme.setTo(super.getTheme());
    }

/**

* AssetManager mAssetManager = null;

* Resources mResources;

* String mDexPath; //apk文件路径

* Resources.Theme mTheme;

protected void loadResources() {

try {

AssetManager assetManager = AssetManager.class.newInstance();

Method addAssetPath = assetManager.getClass().getMethod("addAssetPath", String.class);

addAssetPath.invoke(assetManager, mDexPath);

mAssetManager = assetManager;

} catch (Exception e) {

e.printStackTrace();

}

Resources superRes = super.getResources();

mResources = new Resources(mAssetManager, superRes.getDisplayMetrics(),

superRes.getConfiguration());

mTheme = mResources.newTheme();

mTheme.setTo(super.getTheme());

}

使用插件里的资源

       // 获取对应资源的id,参数为文件名,资源类型,插件apk包名
       int id = mResources.getIdentifier("picc", "drawable",
                    "com.example.sometest");
       imageView.setImageDrawable(mResources.getDrawable(id));

// 获取对应资源的id,参数为文件名,资源类型,插件apk包名

int id = mResources.getIdentifier("picc", "drawable",

"com.example.sometest");

imageView.setImageDrawable(mResources.getDrawable(id));

一些方法


packageName = mResources.getResourcePackageName(R.string.app_name);//获取插件包名

Class<?> cls = Class.forName("com.android.internal.policy.PolicyManager");
Method m = cls.getMethod("makeNewLayoutInflater",Context.class);
//传入当前PluginProxyContext类实例，创建一个布局加载器
mLayoutInflater = (LayoutInflater) m.invoke(null, this);

packageName = mResources.getResourcePackageName(R.string.app_name);//获取插件包名

Class<?> cls = Class.forName("com.android.internal.policy.PolicyManager");

Method m = cls.getMethod("makeNewLayoutInflater",Context.class);

//传入当前PluginProxyContext类实例，创建一个布局加载器

mLayoutInflater = (LayoutInflater) m.invoke(null, this);

自己写的一个工具类

import android.content.Context;
import android.content.ContextWrapper;
import android.content.res.AssetManager;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import java.io.File;
import java.lang.reflect.Method;

import dalvik.system.DexClassLoader;

/**
 * 加载SD卡上的apk安装包
 * 2016-03-14
 */
public class PlugContext extends ContextWrapper {

    private Context context;
    private AssetManager mAssetManager = null;
    private Resources mResources;
    private String mDexPath;
    private DexClassLoader localDexClassLoader;
    private Resources.Theme mTheme;
    private String packageName;
    private LayoutInflater mLayoutInflater;


    /*********
     * 获取apk里的资源
     ***********/
    public static final String LAYOUT = "layout";
    public static final String ID = "id";
    public static final String DRAWABLE = "drawable";
    public static final String STYLE = "style";
    public static final String STRING = "string";
    public static final String COLOR = "color";
    public static final String DIMEN = "dimen";


    public PlugContext(Context base) {
        super(base);
        this.context = base;
    }

    /**
     * 加载apk文件
     *
     * @param apkPath        apk文件的路径
     * @param apkPackageName apk插件的包名
     */
    public void loadApk(String apkPath, String apkPackageName) {
        mDexPath = apkPath;
        packageName = apkPackageName;
        loadResources();
        ClassLoader localClassLoader = ClassLoader.getSystemClassLoader();
        //加载的文件的要拷贝的文件夹, Context的getDir(String name, int mode)方法返回在data/data/下的dex文件,没有则创建
        File dexOutputDir = context.getDir("dex", 0);
        localDexClassLoader = new DexClassLoader(apkPath, dexOutputDir.getAbsolutePath(), null, localClassLoader);
    }

    /**
     * 获取插件里的类
     *
     * @param className 包名+类名
     * @return Class
     * @throws ClassNotFoundException
     */
    public Class getClassInPlug(String className) throws ClassNotFoundException {
        Class plugClass = localDexClassLoader.loadClass(className);
        return plugClass;
    }

    /**
     * 获取插件里的方法
     *
     * @param className  包名+类名
     * @param methodName 方法名
     * @param params     参数数组
     * @return
     * @throws NoSuchMethodException
     * @throws ClassNotFoundException
     * @throws IllegalAccessException
     * @throws InstantiationException
     */
    public Method getMethod(String className, String methodName, Class[] params) throws NoSuchMethodException, ClassNotFoundException, IllegalAccessException, InstantiationException {
        Class plugClass = localDexClassLoader.loadClass(className);
        // 下面是反射到方法
        Object instance = plugClass.newInstance();
        Method method = plugClass.getMethod(methodName, params);
        return method;
    }

    /**
     * 获取插件里的方法
     *
     * @param plugClass  类
     * @param methodName 方法名
     * @param params     参数数组
     * @return
     * @throws IllegalAccessException
     * @throws InstantiationException
     * @throws NoSuchMethodException
     */
    public Method getMethod(Class plugClass, String methodName, Class[] params) throws IllegalAccessException, InstantiationException, NoSuchMethodException {
        // 下面是反射到方法
        Object instance = plugClass.newInstance();
        Method method = plugClass.getMethod(methodName, params);
        return method;
    }

    /**
     * 获取对应的AssetManager,Resources
     */
    protected void loadResources() {
        try {
            AssetManager assetManager = AssetManager.class.newInstance();
            Method addAssetPath = assetManager.getClass().getMethod("addAssetPath", String.class);
            addAssetPath.invoke(assetManager, mDexPath);
            mAssetManager = assetManager;
        } catch (Exception e) {
            e.printStackTrace();
        }
        Resources superRes = super.getResources();
        mResources = new Resources(mAssetManager, superRes.getDisplayMetrics(),
                superRes.getConfiguration());
        mTheme = mResources.newTheme();
        mTheme.setTo(super.getTheme());
        getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }


    /**
     * 获取资源的id
     *
     * @param name 资源名
     * @param type 资源类型(drawable,layout,color...)
     * @return
     */
    public int getResId(String name, String type) {
        return mResources.getIdentifier(name, type, packageName);
    }

    public int getId(String name) {
        return mResources.getIdentifier(name, ID, packageName);
    }

    public View getLayout(String name) {
        return mLayoutInflater.inflate(getResId(name, LAYOUT), null);
    }

    public String getString(String name) {
        return mResources.getString(getResId(name, STRING));
    }


    public Drawable getDrawable(String name) {
        return mResources.getDrawable(getResId(name, DRAWABLE));
    }

    public int getColor(String name) {
        return mResources.getColor(getResId(name, COLOR));
    }

    public int getStyle(String name) {
        return getResId(name, STYLE);
    }

    public float getDimen(String name) {
        return mResources.getDimension(getResId(name, DIMEN));
    }

    @Override
    public Object getSystemService(String name) {
        if (LAYOUT_INFLATER_SERVICE.equals(name)) {
            if (mLayoutInflater == null) {
                try {
                    Class<?> cls = Class
                            .forName("com.android.internal.policy.PolicyManager");
                    Method m = cls.getMethod("makeNewLayoutInflater",
                            Context.class);
                    mLayoutInflater = (LayoutInflater) m.invoke(null, this);
                } catch (Throwable e) {
                    e.printStackTrace();
                }
            } else {
                return mLayoutInflater;
            }
        }
        return super.getSystemService(name);
    }

    /**
     * 重写getResources方法,屏蔽原来的那一个
     */
    @Override
    public Resources getResources() {
        if (mResources != null) {
            return mResources;
        }
        return super.getResources();
    }

    @Override
    public AssetManager getAssets() {
        if (mAssetManager != null) {
            return mAssetManager;
        }
        return super.getAssets();
    }
}

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import android.content.Context;

import android.content.ContextWrapper;

import android.content.res.AssetManager;

import android.content.res.Resources;

import android.graphics.drawable.Drawable;

import android.view.LayoutInflater;

import android.view.View;

import java.io.File;

import java.lang.reflect.Method;

import dalvik.system.DexClassLoader;

/**

* 加载SD卡上的apk安装包

* 2016-03-14

public class PlugContext extends ContextWrapper {

private Context context;

private AssetManager mAssetManager = null;

private Resources mResources;

private String mDexPath;

private DexClassLoader localDexClassLoader;

private Resources.Theme mTheme;

private String packageName;

private LayoutInflater mLayoutInflater;

/*********

* 获取apk里的资源

***********/

public static final String LAYOUT = "layout";

public static final String ID = "id";

public static final String DRAWABLE = "drawable";

public static final String STYLE = "style";

public static final String STRING = "string";

public static final String COLOR = "color";

public static final String DIMEN = "dimen";

public PlugContext(Context base) {

super(base);

this.context = base;

}

/**

* 加载apk文件

* @param apkPath apk文件的路径

* @param apkPackageName apk插件的包名

public void loadApk(String apkPath, String apkPackageName) {

mDexPath = apkPath;

packageName = apkPackageName;

loadResources();

ClassLoader localClassLoader = ClassLoader.getSystemClassLoader();

//加载的文件的要拷贝的文件夹, Context的getDir(String name, int mode)方法返回在data/data/下的dex文件,没有则创建

File dexOutputDir = context.getDir("dex", 0);

localDexClassLoader = new DexClassLoader(apkPath, dexOutputDir.getAbsolutePath(), null, localClassLoader);

}

/**

* 获取插件里的类

* @param className 包名+类名

* @return Class

* @throws ClassNotFoundException

public Class getClassInPlug(String className) throws ClassNotFoundException {

Class plugClass = localDexClassLoader.loadClass(className);

return plugClass;

}

/**

* 获取插件里的方法

* @param className 包名+类名

* @param methodName 方法名

* @param params 参数数组

* @return

* @throws NoSuchMethodException

* @throws ClassNotFoundException

* @throws IllegalAccessException

* @throws InstantiationException

public Method getMethod(String className, String methodName, Class[] params) throws NoSuchMethodException, ClassNotFoundException, IllegalAccessException, InstantiationException {

Class plugClass = localDexClassLoader.loadClass(className);

// 下面是反射到方法

Object instance = plugClass.newInstance();

Method method = plugClass.getMethod(methodName, params);

return method;

}

/**

* 获取插件里的方法

* @param plugClass 类

* @param methodName 方法名

* @param params 参数数组

* @return

* @throws IllegalAccessException

* @throws InstantiationException

* @throws NoSuchMethodException

public Method getMethod(Class plugClass, String methodName, Class[] params) throws IllegalAccessException, InstantiationException, NoSuchMethodException {

// 下面是反射到方法

Object instance = plugClass.newInstance();

Method method = plugClass.getMethod(methodName, params);

return method;

}

/**

* 获取对应的AssetManager,Resources

protected void loadResources() {

try {

AssetManager assetManager = AssetManager.class.newInstance();

Method addAssetPath = assetManager.getClass().getMethod("addAssetPath", String.class);

addAssetPath.invoke(assetManager, mDexPath);

mAssetManager = assetManager;

} catch (Exception e) {

e.printStackTrace();

}

Resources superRes = super.getResources();

mResources = new Resources(mAssetManager, superRes.getDisplayMetrics(),

superRes.getConfiguration());

mTheme = mResources.newTheme();

mTheme.setTo(super.getTheme());

getSystemService(Context.LAYOUT_INFLATER_SERVICE);

}

/**

* 获取资源的id

* @param name 资源名

* @param type 资源类型(drawable,layout,color...)

* @return

public int getResId(String name, String type) {

return mResources.getIdentifier(name, type, packageName);

}

public int getId(String name) {

return mResources.getIdentifier(name, ID, packageName);

}

public View getLayout(String name) {

return mLayoutInflater.inflate(getResId(name, LAYOUT), null);

}

public String getString(String name) {

return mResources.getString(getResId(name, STRING));

}

public Drawable getDrawable(String name) {

return mResources.getDrawable(getResId(name, DRAWABLE));

}

public int getColor(String name) {

return mResources.getColor(getResId(name, COLOR));

}

public int getStyle(String name) {

return getResId(name, STYLE);

}

public float getDimen(String name) {

return mResources.getDimension(getResId(name, DIMEN));

}

@Override

public Object getSystemService(String name) {

if (LAYOUT_INFLATER_SERVICE.equals(name)) {

if (mLayoutInflater == null) {

try {

Class<?> cls = Class

.forName("com.android.internal.policy.PolicyManager");

Method m = cls.getMethod("makeNewLayoutInflater",

Context.class);

mLayoutInflater = (LayoutInflater) m.invoke(null, this);

} catch (Throwable e) {

e.printStackTrace();

}

} else {

return mLayoutInflater;

}

return super.getSystemService(name);

}

/**

* 重写getResources方法,屏蔽原来的那一个

@Override

public Resources getResources() {

if (mResources != null) {

return mResources;

}

return super.getResources();

}

@Override

public AssetManager getAssets() {

if (mAssetManager != null) {

return mAssetManager;

}

return super.getAssets();

}

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