android安装包安装后打开闪退

apk安装之后闪退，求解，源码如下：
MainActivity.java文件：

 package com.example.c;
 import android.app.Activity;
 import android.os.Bundle;
 import android.view.ViewGroup.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
 public void onCreate(Bundle savedInstanceState){
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 LinearLayout layout=(LinearLayout)findViewById(R.id.layout);
 for(int i=0;i<imagePath.length;i++){
 img[i]=new ImageView(this);
 img[i].setImageResource(imagePath[i]);
 img[i].setPadding(5, 5, 5, 5);
 LayoutParams params=new LayoutParams(253,148);
 img[i].setLayoutParams(params);
 layout.addView(img[i]);
 }
 }
 }