Android通过图片名字获得ID

package com.zhycheng;

import android.R.drawable;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ImageView;

import com.zhycheng.R;

public class TestClassActivity extends Activity implements OnClickListener {

Button b;

ImageView iv;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

b=(Button) findViewById(R.id.button1);

iv=(ImageView) findViewById(R.id.imageView1);

b.setOnClickListener(this);

}

@Override

public void onClick(View v) {

Class<com.zhycheng.R.drawable> cls = R.drawable.class;

try {

int value = cls.getDeclaredField("ic_launcher").getInt(null);

iv.setBackgroundResource(value);

//Log.v("value",value.toString());

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

这是整个Activity中的代码，其实关键也就那么几行。