Android 如何更改 OnTouchListener 上的按钮背景

Question

您好，我在 xml 中有一个按钮，我OnTouchListener在活动中使用它来button按下和释放。但问题是，当我按下按钮时，背景颜色没有改变。当我扩展时，OnClickListener背景活动可能会发生变化。任何人都可以告诉我的代码有什么问题吗？

 public class pushbuttonActivity extends Activity implements OnTouchListener {
@Override
        public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
            setContentView(R.layout.push_button_layout);
            GPIO_0_B  = (Button) findViewById(R.id.GPIO_0);
        GPIO_0_B.setOnTouchListener((OnTouchListener) this); 
     }

    public boolean onTouch(View v,MotionEvent event) {
            switch(v.getId()) {
                case R.id.GPIO_0 :  GPIOPORT=0;
                            break;

            default      :  break;                  
            }

            if(event.getAction() == MotionEvent.ACTION_DOWN) {
               //Do something on touch    
                 } else if (event.getAction() == MotionEvent.ACTION_UP) {
                  //Do something in release
                 } 
            return true;
        }

Push_button_layout.xml

<RelativeLayout .........
.................
      <Button
        android:id="@+id/GPIO_0"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:background="@drawable/round_button"
        android:textStyle="bold"
        android:textSize="14sp"
        android:text="GPIO 0" 
        android:layout_marginTop="15dp" 
        android:layout_marginBottom="10dp"
        android:layout_marginLeft="50dp"
       />

round_button.xml

<?xml version="1.0" encoding="utf-8" ?> 
     <selector xmlns:android="http://schemas.android.com/apk/res/android">


         <!--  Non focused states 
      --> 
      <item android:state_focused="false" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/round_button_unfocused" /> 
      <item android:state_focused="false" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/round_button_unfocused" /> 

       <!--  Focused states 
      --> 
      <item android:state_focused="true" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/round_button_focus" /> 
      <item android:state_focused="true" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/round_button_focus" /> 
     <!--  Pressed 
      --> 
      <item android:state_pressed="true" android:drawable="@drawable/round_button_press" /> 
    </selector>

round_button_focus.xml

<shape xmlns:android="http://schemas.android.com/apk/res/android" 
    android:shape="rectangle">
  <stroke 
        android:width="1dp"
        android:color="#FF404040" /> 
  <corners 
        android:radius="6dp" /> 

  <size android:height="40dp"
       android:width="40dp"/>

  <gradient
        android:startColor="#FF6800" 
        android:centerColor="#FF8000" 
        android:endColor="#FF9700" 
        android:angle="90" /> 
</shape>

round_button_press.xml

<shape xmlns:android="http://schemas.android.com/apk/res/android" 
    android:shape="rectangle">
  <stroke 
        android:width="2dp"
        android:color="#FF606060" /> 
  <corners 
        android:radius="40dp" /> 
  <gradient
        android:startColor="#FF0000" 
        android:centerColor="#FF0000" 
        android:endColor="#FF0000" 
        android:angle="90" /> 
</shape>

round_button_unfocus.xml

<shape xmlns:android="http://schemas.android.com/apk/res/android" 
    android:shape="rectangle">
  <stroke 
        android:width="2dp"
        android:color="#FF606060" /> 
  <corners 
        android:radius="40dp" /> 
  <gradient
        android:startColor="#550000" 
        android:centerColor="#550000" 
        android:endColor="#550000" 
        android:angle="90" /> 
</shape>

对于冗长的帖子感到抱歉......

Answer 1

@Override
public boolean onTouch(View v, MotionEvent event) {

    switch(event.getAction()) {

        case MotionEvent.ACTION_DOWN:
            v.setPressed(true);
            //doYourWorkHere();
            break;
        case MotionEvent.ACTION_UP:
            v.setPressed(false);
            //doYourWorkHere();
            break;
        }

    return true;/* true to deactivate other listeners at the same time; false otherwise */
}