方法1：

package com.pic;  
 
import android.app.Activity;  
import android.os.Bundle;  
import android.util.Log;  
import android.view.ViewGroup.LayoutParams;  
import android.widget.ImageView;  
 
public class PicTest extends Activity {  
        private final String TAG = "Pictrue Test!!!";  
        private ImageView image;  
        private int height = 0;  
        private int width = 0;  
          
    /** Called when the activity is first created. */  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
          
        image = (ImageView)findViewById(R.id.ImageView01);  
        //height = image.getHeight();  
        //width = image.getWidth();  
        //Log.d(TAG, "height: " + height);  
        //Log.d(TAG, "width: " + width);  
          
          
        LayoutParams para;  
        para = image.getLayoutParams();  
          
        Log.d(TAG, "layout height0: " + para.height);  
        Log.d(TAG, "layout width0: " + para.width);  
          
        para.height = 300;  
        para.width = 300;  
        image.setLayoutParams(para);  
          
        Log.d(TAG, "layout height: " + para.height);  
        Log.d(TAG, "layout width: " + para.width);  
          
    }  

}

方法2：

 RelativeLayout.LayoutParams param = new RelativeLayout.LayoutParams(dm.widthPixels, dm.heightPixels/2-30);

 top_image.setLayoutParams(param);

DisplayMetrics dm = new DisplayMetrics();
getActivity().getWindowManager().getDefaultDisplay().getMetrics(dm);
int screenW = dm.
 
widthPixels;
cursorIv.setLayoutParams(new LinearLayout.LayoutParams(screenW/4, 5));