如何使按钮突出显示？

Question

我将图像设置为按钮背景,但按钮在单击时没有突出显示.有没有办法解决它.

Answer 1

如果这是一个ImageButton并且您不想为每个按下/未按下状态使用多个drawable,则可以使用图像的颜色过滤器.该解决方案类似于Omar使用的解决方案.

创建一个OnTouchListener,在触摸时修改滤色器.

public class ButtonHighlighterOnTouchListener implements OnTouchListener {

  final ImageButton imageButton;

  public ButtonHighlighterOnTouchListener(final ImageButton imageButton) {
    super();
    this.imageButton = imageButton;
  }

  public boolean onTouch(final View view, final MotionEvent motionEvent) {
    if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
      //grey color filter, you can change the color as you like
      imageButton.setColorFilter(Color.argb(155, 185, 185, 185));
    } else if (motionEvent.getAction() == MotionEvent.ACTION_UP) {
      imageButton.setColorFilter(Color.argb(0, 185, 185, 185)); 
    }
    return false;
  }

}

将此侦听器分配给您的按钮:

  myButton = (ImageButton) findViewById(R.id.myButton);
  myButton.setOnTouchListener(new ButtonHighlighterOnTouchListener(myButton));

更新

改进了通过其复合Drawable将Hig​​hlighter应用于ImageView,ImageButton或TextView的类.

public class ButtonHighlighterOnTouchListener implements OnTouchListener {

  private static final int TRANSPARENT_GREY = Color.argb(0, 185, 185, 185);
  private static final int FILTERED_GREY = Color.argb(155, 185, 185, 185);

  ImageView imageView;
  TextView textView;

  public ButtonHighlighterOnTouchListener(final ImageView imageView) {
    super();
    this.imageView = imageView;
  }

  public ButtonHighlighterOnTouchListener(final TextView textView) {
    super();
    this.textView = textView;
  }

  public boolean onTouch(final View view, final MotionEvent motionEvent) {
    if (imageView != null) {
      if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
        imageView.setColorFilter(FILTERED_GREY);
      } else if (motionEvent.getAction() == MotionEvent.ACTION_UP) {
        imageView.setColorFilter(TRANSPARENT_GREY); // or null
      }
    } else {
      for (final Drawable compoundDrawable : textView.getCompoundDrawables()) {
        if (compoundDrawable != null) {
          if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
            // we use PorterDuff.Mode. SRC_ATOP as our filter color is already transparent
            // we should have use PorterDuff.Mode.LIGHTEN with a non transparent color
            compoundDrawable.setColorFilter(FILTERED_GREY, PorterDuff.Mode.SRC_ATOP);
          } else if (motionEvent.getAction() == MotionEvent.ACTION_UP) {
            compoundDrawable.setColorFilter(TRANSPARENT_GREY, PorterDuff.Mode.SRC_ATOP); // or null
          }
        }
      }
    }
    return false;
  }

}

Answer 2

看到这里

罗曼盖伊的回答也在这里:

在res/drawable中,创建一个名为mybutton_background.xml的文件,并在其中放入如下内容:

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

    <item android:state_focused="true" android:state_pressed="false" 
        android:drawable="@drawable/button_background_focus" /> 

    <item android:state_focused="true" android:state_pressed="true" 
        android:drawable="@drawable/button_background_pressed" /> 

    <item android:state_focused="false" android:state_pressed="true" 
        android:drawable="@drawable/button_background_pressed" /> 

    <item android:drawable="@drawable/button_background_normal" /> 

</selector> 

然后将此drawable设置为按钮的背景 android:background="@drawable/mybutton_background"

Answer 3

为了帮助您获得正确的资源,请参阅StateList Drawable的文档.您只需在res/drawable子目录中创建并定义它,并将其设置为按钮背景.