Android Studio中相对布局问题中按钮顶部的进度条 [英] progressbar on top of Button in relative layout issue in Android Studio
问题描述
好吧,这很奇怪,我希望有人可以向我解释.
Ok this is a weird one I hope someone can explain to me.
我有一个自定义按钮布局,该布局创建了一个按钮,按钮中间有一个圆形进度条.我的XML代码如下.但是,我无法解决的问题是 ProgressBar
似乎出现在按钮后面.如果我将按钮背景设置为非透明以外的其他颜色,则无法看到进度条.在按钮背景为透明的情况下,我可以看到 ProgressBar
,但它仍显示在按钮文本的后面.我的理解是,视图按添加的顺序出现.我什至尝试将视图设置为顶部(view.bringToFront();),并尝试删除视图并重新创建它.
I have a custom button layout which creates a button with a circular progress bar in the middle of the button. My XML code is below. What I can't work out however is that the ProgressBar
seems to be appearing behind the button. If I set the button background to anything other than transparent the progressbar cannot be seen. With the button background as transparent I can then see the ProgressBar
but it still appears behind the button text. I was under the understanding that views appeared in the order they are added. I have even tried setting the view to be on top (view.bringToFront();) and I've tried removing the view and recreating it.
为什么进度条会出现在按钮后面,我该怎么解决?
Why does the progressbar appear behind the button and what can I do to solve it?
非常感谢
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:background="@android:color/holo_blue_bright"
android:padding="2dp">
<Button
android:id="@+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:text="Button"
android:gravity="center"
android:textColor="@android:color/white"
android:singleLine="true"
android:clickable="false">
</Button>
<ProgressBar
android:id="@+id/progressBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:layout_centerInParent="true"
android:visibility="visible"
/>
</RelativeLayout>
使用上述布局的代码
private void setupTableLayout(int NumberOfRows, int NumberOfButtons){
TableLayout.LayoutParams tableParams = new TableLayout.LayoutParams(TableLayout.LayoutParams.MATCH_PARENT, TableLayout.LayoutParams.MATCH_PARENT);
TableRow.LayoutParams rowParams = new TableRow.LayoutParams(0, android.widget.TableRow.LayoutParams.MATCH_PARENT, 3f);
TableLayout tableLayout = (TableLayout) findViewById(R.id.thetablelayout);
tableLayout.removeAllViews();
for (int i = 0; i < NumberOfRows; i++) {
TableRow tableRow = new TableRow(this);
tableRow.setLayoutParams(tableParams);
RelativeLayout btnOneLayout = (RelativeLayout)getLayoutInflater().inflate(R.layout.custom_button, null);
RelativeLayout btnTwoLayout = (RelativeLayout)getLayoutInflater().inflate(R.layout.custom_button, null);
ProgressBar btnOneProgressBar = (ProgressBar)btnOneLayout.findViewById(R.id.progressBar);
ProgressBar btnTwoProgressBar = (ProgressBar)btnTwoLayout.findViewById(R.id.progressBar);
btnOneLayout.setLayoutParams(rowParams);
btnTwoLayout.setLayoutParams(rowParams);
Button btnOne = (Button)btnOneLayout.findViewById(R.id.button);
btnOne.setText("Btn 1, Row " + i);
btnOne.setId(1001 + i);
Button btnTwo = (Button)btnTwoLayout.findViewById(R.id.button);
btnTwo.setText("Btn 2, Row " + i);
btnTwo.setId(2001 + i);
setButtonClickListener(btnOneLayout, btnOneProgressBar);
setButtonLongClickListener(btnOneLayout, btnOneProgressBar);
tableRow.addView(btnOneLayout); //Add layout, instead of just Button
View adivider = new View(this);
adivider.setLayoutParams(new TableRow.LayoutParams(20, TableRow.LayoutParams.MATCH_PARENT));
adivider.setBackgroundColor(Color.TRANSPARENT);
// This bit of code deals with odd/even numbers of buttons.
if (((i + 1) * 2) < NumberOfButtons + 1) {
tableRow.addView(adivider);
tableRow.addView(btnTwoLayout);
} else {
tableRow.addView(adivider);
btnTwoLayout.setBackgroundResource(android.R.color.transparent);
tableRow.addView(btnTwoLayout);
}
tableLayout.addView(tableRow);
}
}
推荐答案
您可能会在android> = 5.0上运行它.在5.0中,他们为视图添加了高程字段.海拔高度定义了ViewGroup中视图的z顺序.
You are propably running this on android >= 5.0. In 5.0 they added elevation field for views. Elevation defines z-order of views in ViewGroup.
在这种情况下,按钮的海拔高度值不为零,进度条的海拔高度值为零.
In that case button have non-zero elevation value and progress bar have zero value elevation.
将进度条的高程设置为例如10dp
Set elevation of progress bar to e.g. 10dp
<ProgressBar
...
android:elevation="10dp"/>
这篇关于Android Studio中相对布局问题中按钮顶部的进度条的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!