使用单个图像按下时更改按钮的颜色

Question

我有一个九按钮图像的按钮。我不想为“按下”状态提供另一个图像（这是StateListDrawable要求的）。我只是想让它在被按下时变得更“黑暗”（就像iOS按钮一样）。我怎样才能做到这一点？

Answer 1

使用这样的事情：

public class MyStateDrawable extends LayerDrawable { 

    public MyStateDrawable(Drawable[] layers) { 
     super(layers); 
    } 

    @Override 
    protected boolean onStateChange(int[] states) { 
     for (int state : states) { 
      if (state == R.attr.state_activated || state == android.R.attr.state_pressed) { 
       super.setColorFilter(0x7f000000, Mode.SRC_ATOP); 
       return true; 
      } else if(state == -android.R.attr.state_activated || state == -android.R.attr.state_pressed){ 
       super.setColorFilter(0x00000000, Mode.SRC_ATOP); 
       return true; 
      }else { 
       super.setColorFilter(null); 
      } 
     } 
     return super.onStateChange(states); 
    } 

    @Override 
    public boolean isStateful() { 
     return true; 
    } 
} 

然后

StateDrawable state = new MyStateDrawable(new Drawable[]{mDefaultDrawable}); 
view.setImageDrawable(state); 

希望这将帮助你:)