如何设置按钮的state_pressed

Question

我使用xml文件为我的按钮着色。在xml中，有这段代码来定义单击按钮时按钮的颜色。

    <?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>

在java中，有没有可能让我的按钮保持按下状态，并用xml文件中设置的"state_pressed“值给它上色？

像这样的东西：

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

当然，这段代码没有任何意义，我只是想让您理解我想要做的事情

Answer 1

尝尝这个。

<?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通过代码设置选择器，如下所示：

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

使用以下命令：

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