java Android DexClassLoader错误,“优化数据目录..”。。不属于当前用户的
我正在尝试生成一个简单的安卓应用程序,它可以在运行时从SD卡加载一个DEX文件
该应用程序有两个活动。第一个活动是一个带有按钮的简单屏幕。按下按钮后,将启动第二个活动,从而调用loadDex()方法。loadDex()方法尝试在SD卡上定位jar文件并将其加载到当前应用程序中
以下是我的第一个活动代码:
package poc.example.del.customclass;
import 安卓.content.Intent;
import 安卓.support.v7.app.ActionBarActivity;
import 安卓.os.Bundle;
import 安卓.view.Menu;
import 安卓.view.MenuItem;
import 安卓.view.View;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void launchLoadClass(View view) {
Intent intent = new Intent(MainActivity.this, LoadClass.class);
startActivity(intent);
}
}
下面是我的第二个活动(加载DEX文件的活动)的代码:
package poc.example.del.customclass;
import 安卓.support.v7.app.ActionBarActivity;
import 安卓.os.Bundle;
import 安卓.view.Menu;
import 安卓.view.MenuItem;
import 安卓.widget.TextView;
import 安卓.widget.Toast;
import java.io.File;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import dalvik.system.DexClassLoader;
public class LoadClass extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_load_class);
loadDex();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_load_class, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void loadDex() {
String dexFile = "/sdcard/output.jar";
File jarFile = new File(dexFile);
if (jarFile.exists()) {
// Toast.makeText(getApplicationContext(), "It Worked!", Toast.LENGTH_LONG).show();
DexClassLoader cl = new DexClassLoader (jarFile.toString (), "/data/test", null, ClassLoader.getSystemClassLoader());
}
}
}
调用DexClassLoader构造函数时会出现问题。在日志中可以找到以下错误:
03-25 10:15:48.441 1934-1934/poc.example.del.customclass E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{poc.example.del.customclass/poc.example.del.customclass.LoadClass}: java.lang.IllegalArgumentException: Optimized data directory /data/test is not owned by the current user. Shared storage cannot protect your application from code injection attacks.
at 安卓.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at 安卓.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at 安卓.app.ActivityThread.access$600(ActivityThread.java:141)
at 安卓.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at 安卓.os.Handler.dispatchMessage(Handler.java:99)
at 安卓.os.Looper.loop(Looper.java:137)
at 安卓.app.ActivityThread.main(ActivityThread.java:5039)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalArgumentException: Optimized data directory /data/test is not owned by the current user. Shared storage cannot protect your application from code injection attacks.
at dalvik.system.DexFile.<init>(DexFile.java:100)
at dalvik.system.DexFile.loadDex(DexFile.java:149)
at dalvik.system.DexPathList.loadDexFile(DexPathList.java:261)
at dalvik.system.DexPathList.makeDexElements(DexPathList.java:229)
at dalvik.system.DexPathList.<init>(DexPathList.java:96)
at dalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:56)
at dalvik.system.DexClassLoader.<init>(DexClassLoader.java:57)
at poc.example.del.customclass.LoadClass.loadDex(LoadClass.java:54)
at poc.example.del.customclass.LoadClass.onCreate(LoadClass.java:23)
at 安卓.app.Activity.performCreate(Activity.java:5104)
at 安卓.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at 安卓.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
at 安卓.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at 安卓.app.ActivityThread.access$600(ActivityThread.java:141)
at 安卓.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at 安卓.os.Handler.dispatchMessage(Handler.java:99)
at 安卓.os.Looper.loop(Looper.java:137)
at 安卓.app.ActivityThread.main(ActivityThread.java:5039)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
以下是日志中我认为代表问题的一行:
java.lang.IllegalArgumentException: Optimized data directory /data/test is not owned by the current user. Shared storage cannot protect your application from code injection attacks.
如果您能提供任何帮助,我将不胜感激,因为我在网上几乎没有找到关于这个问题的信息。我正在为Android 4.2 Api 17开发应用程序
提前谢谢
# 1 楼答案
经过几天的学习,我找到了答案。我想我会在这里发布解决方案,以防其他人有类似的问题
出于安全原因,Android不允许应用程序将文件加载到任何随机文件夹。相反,它应该加载到应用程序环境中。下面是修改后的代码,它允许我继续这个项目。显示的代码是针对“loadDex()”方法的:
解决问题的特定代码行是:
如您所见,optimizedDexOutputPath,getAbsolutePath()方法返回应用程序可用于向其写入文件的目录
希望这能帮助其他有类似问题的人