android查询已安装运用所亟需的权限

代码如下：

import java.lang.reflect.Constructor;import java.lang.reflect.Method;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.view.View;public class DemoActivity extends Activity {        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);       // setContentView(R.layout.main);                        //AppSecurityPermissions                         try {        	Class clazz = getClass().getClassLoader().loadClass("android.widget.AppSecurityPermissions");		        	Constructor constructor = clazz.getConstructor(new Class[]{Context.class,String.class});        	//"com.example.mobilesafe"是所要查询的运用的包名        	Object object = constructor.newInstance(new Object[]{this,"com.example.mobilesafe"});        	        	        	Method method = clazz.getDeclaredMethod("getPermissionsView", new Class[]{});        	            View view =	(View) method.invoke(object, new Object[]{});                        setContentView(view);                } catch (Exception e) {			e.printStackTrace();		}    }}