Android Studio開發基礎之使用XML和Java代碼混合控制UI界面

package com.example.lhb.contentprovider1;

import android.app.ActionBar;
import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.graphics.Color;
import android.provider.ContactsContract;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.TypedValue;
import android.view.Menu;
import android.view.MenuItem;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;


public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        LinearLayout LL=(LinearLayout)findViewById(R.id.layout);

        ImageView []Img=new ImageView[4];
        int []ImgSource=new int[]{
             R.drawable.pic1,R.drawable.pic2,R.drawable.pic3,R.drawable.pic4
        };

        for(int i=0;i