如何在Android中的视图设置不透明度(alpha) [英] How to Set Opacity (Alpha) for View in Android
问题描述
我有一个按钮,如下所示:
I have a button as in the following:
<Button
android:text="Submit"
android:id="@+id/Button01"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</Button>
在我的的onCreate()
事件,我打电话Button01是这样的:
In my onCreate()
event, I am calling Button01 like this:
setContentView(R.layout.main);
View Button01 = this.findViewById(R.id.Button01);
Button01.setOnClickListener(this);
有一个在应用程序的背景下,我想设置这个提交按钮的不透明度。如何设置不透明度为这个观点?有什么事情,我可以在Java端设置,或者我可以在main.xml中文件中设置?
There is a background in the application, and I want to set an opacity on this submit button. How can I set an opacity for this view? Is it something that I can set on the java side, or can I set in the main.xml file?
在Java方面我试过 Button01.mutate()。SetAlpha(100)
,但它给了我一个错误。
On the java side I tried Button01.mutate().SetAlpha(100)
, but it gave me an error.
推荐答案
我刚刚发现你的问题,而具有类似的问题,一个TextView。我能解决这个问题,通过扩展的TextView并覆盖 onSetAlpha
。也许你可以尝试类似的东西与你的按钮:
I just found your question while having the similar problem with a TextView. I was able to solve it, by extending TextView and overriding onSetAlpha
. Maybe you could try something similar with your button:
import android.content.Context;
import android.util.AttributeSet;
import android.widget.TextView;
public class AlphaTextView extends TextView {
public AlphaTextView(Context context) {
super(context);
}
public AlphaTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public AlphaTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public boolean onSetAlpha(int alpha) {
setTextColor(getTextColors().withAlpha(alpha));
setHintTextColor(getHintTextColors().withAlpha(alpha));
setLinkTextColor(getLinkTextColors().withAlpha(alpha));
return true;
}
}
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