如何設置按鈕的狀態_按下

Question

我使用xml文件爲我的按鈕着色。在xml中有一個代碼來定義點擊按鈕時我的按鈕的顏色。

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

    <item android:state_pressed="true" > 
     <shape> 
      <gradient 
        android:startColor="@color/mainRaddoppiaButtonBackgroundEnd" 
       android:endColor="@color/mainRaddoppiaButtonBackgroundStart" 

       android:angle="270" /> 
      <stroke 
       android:width="0dp" 
       android:color="@color/mainRaddoppiaButtonBackgroundStart" /> 
      <corners 
       android:radius="3dp" /> 
      <padding 
       android:left="10dp" 
       android:top="10dp" 
       android:right="10dp" 
       android:bottom="10dp" /> 
     </shape> 
    </item> 

    <item android:state_focused="true" > 
      <shape> 
      <gradient 
        android:startColor="@color/mainRaddoppiaButtonBackgroundEnd" 
       android:endColor="@color/mainRaddoppiaButtonBackgroundStart" 

       android:angle="270" /> 
      <stroke 
       android:width="0dp" 
       android:color="@color/mainRaddoppiaButtonBackgroundStart" /> 
      <corners 
       android:radius="3dp" /> 
      <padding 
       android:left="10dp" 
       android:top="10dp" 
       android:right="10dp" 
       android:bottom="10dp" /> 
     </shape> 
    </item> 

    <item>   
     <shape> 
      <gradient 
       android:startColor="@color/mainRaddoppiaButtonBackgroundStart" 
       android:endColor="@color/mainRaddoppiaButtonBackgroundEnd" 
       android:angle="270" /> 
      <stroke 
       android:width="0dp" 
       android:color="@color/mainRaddoppiaButtonBackgroundStart" /> 
      <corners 
       android:radius="3dp" /> 
      <padding 
       android:left="10dp" 
       android:top="10dp" 
       android:right="10dp" 
       android:bottom="10dp" /> 
     </shape> 
    </item> 
</selector> 

是否可能從java保持我的按鈕被按下，並使用在我的xml文件中設置的「state_pressed」值進行着色？

成才，如：

public void onClick(View button) { 
    button.seLayout(R.xml.xmlFileName.state_pressed) 
} 

當然這個代碼有沒有意義，我只是做它讓你明白我想要做

Answer 1

試試這個。

<?xml version="1.0" encoding="utf-8"?> 
<selector xmlns:android="http://schemas.android.com/apk/res/android"> 
<item android:drawable="@drawable/btn_pressed" 
     android:state_pressed="true"/> 
<item android:drawable="@drawable/btn_normal" /> 
</selector> 

Answer 2

使用StateListDrawable如通過代碼設置選擇：

StateListDrawable states = new StateListDrawable(); 
states.addState(new int[] {android.R.attr.state_pressed},getResources().getDrawable(R.drawable.pressed)); 
states.addState(new int[] {android.R.attr.state_focused},getResources().getDrawable(R.drawable.focused)); 
states.addState(new int[] { },getResources().getDrawable(R.drawable.normal)); 

button.setBackgroundDrawable(states);//FOR BUTTON 

Answer 3

使用此：

StateListDrawable states = new StateListDrawable(){ 
    @Override 
    protected boolean onStateChange(int[] stateSet) { 
     // 
    } 
}; 
itemView.setBackground(states);