package com.kiritor.ui_imageswitcher;  import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageSwitcher; import android.widget.ImageView; import android.widget.ViewSwitcher.ViewFactory; /*注意，此處直接讓該類實現(xiàn)ViewFactory和OnClickListener接口*/ public class MainActivity extends Activity implements ViewFactory, OnClickListener {    /*獲取圖片資源集*/    private static final Integer[] images = {       R.drawable.first,       R.drawable.second,       R.drawable.third,           };        private ImageSwitcher is;    private Button btnPrev,btnNext;    private static int index = 0;   /** Called when the activity is first created. */   @Override   public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     /*通過ID獲取控件*/     is = (ImageSwitcher) findViewById(R.id.image_switchter);     btnPrev = (Button) findViewById(R.id.pre);     btnNext = (Button) findViewById(R.id.next);         is.setFactory(this);//設置ImageSwitcher所需的ViewFactory     is.setImageResource(images[index]);//設置初始的圖片資源     /*由于本類實現(xiàn)了OnClickListen而接口，所以這里參數(shù)可以直接用this*/     btnPrev.setOnClickListener(this);     btnNext.setOnClickListener(this);   }   /*因為實現(xiàn)了接口，需要實現(xiàn)接口中未實現(xiàn)的方法*/    public void onClick(View v) {       switch(v.getId()){       case R.id.next:          index++;          if(index>=images.length){            index = 0;          }          is.setImageResource(images[index]);          break;       case R.id.pre:          index--;          if(index<0){            index = images.length - 1;          }          is.setImageResource(images[index]);          break;       default:          break;       }    }    /**     * 該方法返回一個View的實例     * 這個實例就是要在ImageSwitcher中所顯示的     * 此處就用ImageView來顯示內(nèi)容     * 所以直接返回一個新的ImageView的實例     */    public View makeView() {       return new ImageView(this);    } }