安卓APP开发显示图片图像

package com.example.sl3_3;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.FrameLayout.LayoutParams;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class MainActivity extends Activity {
    
    private ImageView[] img=new ImageView[4];
    private int[] imagePath=new int[]{
            R.drawable.img01,R.drawable.img02,R.drawable.img03,R.drawable.img04
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        LinearLayout layout=(LinearLayout)findViewById(R.id.layout);
        for(int i=0;i<3;i++)
        {
            img[i]=new ImageView(this);
            img[i].setImageResource(imagePath[i]);
            img[i].setPadding(5, 5, 5, 5);//组件内边距
            LayoutParams params=new LayoutParams(253,148);//图片的宽与高
            img[i].setLayoutParams(params);
            layout.addView(img[i]);
            
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.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();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}