Android中ImageView用法实例分析

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical" >
  <TextView
    android:id="@+id/tv"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello" />
  <Button 
    android:id="@+id/button"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    />
  <ImageView 
    android:id="@+id/iv07"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    />
  <ImageView 
    android:id="@+id/iv08"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    />
  <ImageView 
    android:id="@+id/iv09"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    />
</LinearLayout>

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
public class A04Activity extends Activity {
 private ImageView iv07,iv08,iv09;
 private TextView tv;
 private Button b;
 private int[] s={
  R.drawable.puke07,
  R.drawable.puke08,
  R.drawable.puke09
  };
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    iv07=(ImageView)findViewById(R.id.iv07);
    iv08=(ImageView)findViewById(R.id.iv08);
    iv09=(ImageView)findViewById(R.id.iv09);
    tv=(TextView)findViewById(R.id.tv);
    b=(Button)findViewById(R.id.button);
    randon();
    //下面以ImageView的OnClickListener()方法对选择的不同牌做不同的反应
  iv07.setOnClickListener(new OnClickListener(){
  @Override
  public void onClick(View v) {
  // TODO Auto-generated method stub  
  iv07.setImageDrawable(getResources().getDrawable(s[0]));
  iv08.setImageDrawable(getResources().getDrawable(s[1]));
  iv09.setImageDrawable(getResources().getDrawable(s[2]));
  iv08.setAlpha(100);  //对没有选择的牌做灰暗处理
  iv09.setAlpha(100);
  if(s[0]==R.drawable.puke08){ //如果选择的牌是梅花8的话就猜对了
   tv.setText("恭喜你，猜对了！！！");
  }
  else{
   tv.setText("亲，猜错了，要不要再来一次？");
  }
  }
  });
  iv08.setOnClickListener(new OnClickListener(){
  @Override
  public void onClick(View v) {
  // TODO Auto-generated method stub
  iv07.setImageDrawable(getResources().getDrawable(s[0]));
  iv08.setImageDrawable(getResources().getDrawable(s[1]));
  iv09.setImageDrawable(getResources().getDrawable(s[2]));
  iv07.setAlpha(100);
  iv09.setAlpha(100);
  if(s[1]==R.drawable.puke08){
   tv.setText("恭喜你，猜对了！！！");
  }
  else{
   tv.setText("亲，猜错了，要不要再来一次？");
  }
  }
  });
  iv09.setOnClickListener(new OnClickListener(){
  @Override
  public void onClick(View v) {
  // TODO Auto-generated method stub
  iv07.setImageDrawable(getResources().getDrawable(s[0]));
  iv08.setImageDrawable(getResources().getDrawable(s[1]));
  iv09.setImageDrawable(getResources().getDrawable(s[2]));
  iv07.setAlpha(100);
  iv08.setAlpha(100);
  if(s[2]==R.drawable.puke09){
   tv.setText("恭喜你，猜对了！！！");
  }
  else{
   tv.setText("亲，猜错了，要不要再来一次？");
  }
  }
  });
  b.setOnClickListener(new OnClickListener(){
  @Override
  public void onClick(View v) {
  // TODO Auto-generated method stub
  tv.setText("猜猜梅花8在哪里");
  iv07.setImageDrawable(getResources().getDrawable(R.drawable.puke00));
  //刚开始的时候显示扑克牌的背面
  iv08.setImageDrawable(getResources().getDrawable(R.drawable.puke00));
  iv09.setImageDrawable(getResources().getDrawable(R.drawable.puke00));
  iv07.setAlpha(255);//
  iv08.setAlpha(255);
  iv09.setAlpha(255);
  randon();
  }
  });
  }
//randon方法是进行随机地洗牌
  public void randon(){
   for(int i=0;i<s.length;i++){
   int tmp=s[i];
   int a=(int)(Math.random()*2);
   s[i]=s[a];
   s[a]=tmp;
   }
  }
}