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);    }@Overridepublic 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。

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