我知道这是一个愚蠢的问题,但谷歌搜索没有给我一个很好的答案。我的活动中有一个按钮但是当我按下它时,我无法直观地看到它。虽然按钮工作得很好。我知道我必须在xml文件中做一些事情,但我不确定是什么。有没有办法自动使图像按钮稍微改变而不必手动上传两张图片?
答案 0 :(得分:1)
如果您想要使用
,可以禁用该按钮 button.setEnabled(false);
&安培;也可以使用
再次启用 button.setEnabled(true);
修改强>
您也可以尝试通过
更改Button的背景颜色 onClick()
{
button.setBackgroundColor(#CCCCCC);
}
答案 1 :(得分:0)
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.util.AttributeSet;
import android.widget.Button;
/**
* Applies a pressed state color filter or disabled state alpha for the button's background
* drawable.
*
* @author shiki
*/
public class SAutoBgButton extends Button {
public SAutoBgButton(Context context) {
super(context);
}
public SAutoBgButton(Context context, AttributeSet attrs) {
super(context, attrs);
}
public SAutoBgButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public void setBackgroundDrawable(Drawable d) {
// Replace the original background drawable (e.g. image) with a LayerDrawable that
// contains the original drawable.
SAutoBgButtonBackgroundDrawable layer = new SAutoBgButtonBackgroundDrawable(d);
super.setBackgroundDrawable(layer);
}
/**
* The stateful LayerDrawable used by this button.
*/
protected class SAutoBgButtonBackgroundDrawable 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;
public SAutoBgButtonBackgroundDrawable(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);
}
invalidateSelf();
return super.onStateChange(states);
}
@Override
public boolean isStateful() {
return true;
}
}
}
要使用它,只需替换原来的按钮声明:
<Button
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:background="@drawable/button_blue_bg"
android:text="Button with background image" />
这样做:
<com.buttondemo.SAutoBgButton
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:background="@drawable/button_blue_bg"
android:text="Button with background image" />
以下是使用此自定义按钮的示例输出:
希望它有效