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;   }  }}