Android基础TOP2：单机按钮改变字体颜色

      <TextView
      android:id="@+id/t1"
       android:textSize="30dp"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:layout_marginLeft="100dp"
       android:text="改变颜色"
       />
<Button

<Button

<Button

 1 final TextView tv=(TextView) findViewById(R.id.t1);
 2        
 3         final Button btn = (Button)findViewById(R.id.b1);
 4         //设置单击事件，
 5         btn.setOnClickListener(new View.OnClickListener() {
 6 @Override
 7 public void onClick(View v) {
 8 // TODO Auto-generated method stub
 9 //单击时改变颜色 下同
10 tv.setTextColor(android.graphics.Color.RED);
11 }
12 });
13         final Button btn1 = (Button)findViewById(R.id.b2);
14           btn1.setOnClickListener(new View.OnClickListener() {
15  
16   @Override
17   public void onClick(View v) {
18   // TODO Auto-generated method stub
19   tv.setTextColor(android.graphics.Color.GREEN);
20   }
21   });
22           final Button btn2= (Button)findViewById(R.id.b3);
23           btn2.setOnClickListener(new View.OnClickListener() {
24  
25   @Override
26   public void onClick(View v) {
27   // TODO Auto-generated method stub
28   tv.setTextColor(android.graphics.Color.YELLOW);
29   }
30   });