我想稍微改变一个标准的Android按钮的颜色，以便更好地匹配客户端的品牌。
到目前为止，我发现最好的方法是将按钮的可绘制对象更改为位于res/drawable/red_button.xml中的可绘制对象:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="@drawable/red_button_pressed" />
<item android:state_focused="true" android:drawable="@drawable/red_button_focus" />
<item android:drawable="@drawable/red_button_rest" />
</selector>
但是这样做需要为我想要自定义的每个按钮创建三个不同的绘图(一个用于静止的按钮，一个用于聚焦时的按钮，一个用于按下时的按钮)。这似乎比我需要的更复杂和非dry。
我真正想做的是对按钮应用某种颜色变换。有没有比我现在做的更简单的方法来改变按钮的颜色?
我做一个不同风格的按钮，工作得很好是子类按钮对象，并应用一个颜色过滤器。它还通过对按钮应用alpha来处理启用和禁用状态。
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.LightingColorFilter;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.LayerDrawable;
import android.os.Build;
import android.util.AttributeSet;
import android.widget.Button;
public class DimmableButton extends Button {
public DimmableButton(Context context) {
super(context);
}
public DimmableButton(Context context, AttributeSet attrs) {
super(context, attrs);
}
public DimmableButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@SuppressWarnings("deprecation")
@Override
public void setBackgroundDrawable(Drawable d) {
// Replace the original background drawable (e.g. image) with a LayerDrawable that
// contains the original drawable.
DimmableButtonBackgroundDrawable layer = new DimmableButtonBackgroundDrawable(d);
super.setBackgroundDrawable(layer);
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
@Override
public void setBackground(Drawable d) {
// Replace the original background drawable (e.g. image) with a LayerDrawable that
// contains the original drawable.
DimmableButtonBackgroundDrawable layer = new DimmableButtonBackgroundDrawable(d);
super.setBackground(layer);
}
/**
* The stateful LayerDrawable used by this button.
*/
protected class DimmableButtonBackgroundDrawable extends LayerDrawable {
// The color filter to apply when the button is pressed
protected ColorFilter _pressedFilter = new LightingColorFilter(Color.LTGRAY, 1);
// Alpha value when the button is disabled
protected int _disabledAlpha = 100;
// Alpha value when the button is enabled
protected int _fullAlpha = 255;
public DimmableButtonBackgroundDrawable(Drawable d) {
super(new Drawable[] { d });
}
@Override
protected boolean onStateChange(int[] states) {
boolean enabled = false;
boolean pressed = false;
for (int state : states) {
if (state == android.R.attr.state_enabled)
enabled = true;
else if (state == android.R.attr.state_pressed)
pressed = true;
}
mutate();
if (enabled && pressed) {
setColorFilter(_pressedFilter);
} else if (!enabled) {
setColorFilter(null);
setAlpha(_disabledAlpha);
} else {
setColorFilter(null);
setAlpha(_fullAlpha);
}
invalidateSelf();
return super.onStateChange(states);
}
@Override
public boolean isStateful() {
return true;
}
}
}
我喜欢@conjugatedirection和@Tomasz之前回答中的颜色滤镜建议;然而，我发现到目前为止提供的代码并不像我预期的那样容易应用。
首先，它没有提到在哪里应用和清除颜色滤镜。可能还有其他好地方可以做到这一点，但我想到的是OnTouchListener。
From my reading of the original question, the ideal solution would be one that does not involve any images. The accepted answer using custom_button.xml from @emmby is probably a better fit than color filters if that's your goal. In my case, I'm starting with a png image from a UI designer of what the button is supposed to look like. If I set the button background to this image, the default highlight feedback is lost completely. This code replaces that behavior with a programmatic darkening effect.
button.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
// 0x6D6D6D sets how much to darken - tweak as desired
setColorFilter(v, 0x6D6D6D);
break;
// remove the filter when moving off the button
// the same way a selector implementation would
case MotionEvent.ACTION_MOVE:
Rect r = new Rect();
v.getLocalVisibleRect(r);
if (!r.contains((int) event.getX(), (int) event.getY())) {
setColorFilter(v, null);
}
break;
case MotionEvent.ACTION_OUTSIDE:
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
setColorFilter(v, null);
break;
}
return false;
}
private void setColorFilter(View v, Integer filter) {
if (filter == null) v.getBackground().clearColorFilter();
else {
// To lighten instead of darken, try this:
// LightingColorFilter lighten = new LightingColorFilter(0xFFFFFF, filter);
LightingColorFilter darken = new LightingColorFilter(filter, 0x000000);
v.getBackground().setColorFilter(darken);
}
// required on Android 2.3.7 for filter change to take effect (but not on 4.0.4)
v.getBackground().invalidateSelf();
}
});
我将其提取为一个单独的类，用于应用到多个按钮-显示为匿名内部类只是为了了解这个概念。
