举例说明android中ImageView的用法

猜牌游戏大家可能以前都玩过，这里我们用这个小游戏来说明ImageView的用法。

首先，在res/drawable中引入三张牌：分别是梅花7，梅花8，梅花9

然后在res/layout/main.xml中配置一个TextView,三个ImageView以及一个Button

http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

            android:id="@+id/tv"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
            android:id="@+id/button"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />
            android:id="@+id/iv07"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />
            android:id="@+id/iv08"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />
            android:id="@+id/iv09"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />

 

程序如下面所示：

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       int tmp=s[i];
      int a=(int)(Math.random()*2);
      s[i]=s[a];
      s[a]=tmp;
     }
    }
}