Android 加载其他Apk中的类方法

注意读写SD卡的权限问题

public void loadApkClass(String apkPath, Context context) {
    //app路径下的文件夹名称
    File dexOutputDir = context.getDir("dex", 0);
    //被加载的Class
    String className = "com.mz.testapk.TestClass";
    DexClassLoader classLoader = new DexClassLoader(apkPath, dexOutputDir.getAbsolutePath(), null, getClassLoader());
    try {
        Class mLoadClass = classLoader.loadClass(className);
        //默认构造方法
        Constructor constructor = mLoadClass.getConstructor(new Class[]{});
        Object testClass = constructor.newInstance(new Object[]{});
        //TestClass 中的getStr方法
        Method getStr = mLoadClass.getDeclaredMethod("getStr", null);
        getStr.setAccessible(true);
        Object money = getStr.invoke(testClass, null);
        Toast.makeText(this, money.toString(), Toast.LENGTH_LONG).show();
    } catch (Exception e) {
        e.printStackTrace();
    }

}

// TestClass代码

package com.mz.testapk;

public class TestClass {
    public String getStr() {
        return "TestClassStr";
    }
}