Android获取其他应用资源(跨应用获取资源)的两种方式

方式一： 利用PackageManager

ImageView mIvIcon;
TextView mTvTitle;
......

PackageManager pm = mContext.getPackageManager();
Resources rs = null;
try {
    rs = pm.getResourcesForApplication("com.yf.test");
} catch (PackageManager.NameNotFoundException e) {
    e.printStackTrace();
}
if (null != rs) {
    int ivId = rs.getIdentifier("ic_launcher", "mipmap", "com.yf.test");
    int tvId = rs.getIdentifier("app_name", "string", "com.yf.test");
    mIvIcon.setImageDrawable(rs.getDrawable(ivId));
    mTvTitle.setText(rs.getString(tvId));
}

方式二：利用目标资源所在的Context

Context remoteContext = null;
try {
    remoteContext = mContext.createPackageContext("com.yf.test", CONTEXT_INCLUDE_CODE | CONTEXT_IGNORE_SECURITY);
} catch (PackageManager.NameNotFoundException e) {
    e.printStackTrace();
}

if (null != remoteContext) {
    int ivId = remoteContext.getResources().getIdentifier("ic_launcher", "mipmap", "com.yf.test");
    int tvId = remoteContext.getResources().getIdentifier("app_name", "string", "com.yf.test");
    mIvIcon.setImageDrawable(remoteContext.getDrawable(ivId));
    mTvTitle.setText(remoteContext.getString(tvId));
}

附录

1.CONTEXT_INCLUDE_CODE的意思是包括代码，也就是说可以执行这个包里面的代码
  CONTEXT_IGNORE_SECURITY的忽略安全警告，如果不加这个标志的话，有些功能是用不了的，会出现安全警告。
2.获取不到资源时，原因可能在于android:sharedUserId
   package="com.yf.test"
       android:sharedUserId="xxx"