Android Studio中相对布局问题中Button上的进度条

Question

好的,这是一个奇怪的,我希望有人可以向我解释.

我有一个自定义按钮布局,在按钮中间创建一个带有圆形进度条的按钮.我的XML代码如下.然而,我无法解决的是,它ProgressBar似乎出现在按钮后面.如果我将按钮背景设置为透明以外的任何其他内容,则无法看到进度条.随着按钮背景透明,我可以看到ProgressBar它,但它仍然出现在按钮文本后面.我的理解是视图按照添加的顺序出现.我甚至尝试将视图设置在顶部(view.bringToFront();)并且我尝试删除视图并重新创建它.

为什么进度条出现在按钮后面,我该怎么做才能解决它？

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> 

代码使用上面的布局

 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);

    }

}

Answer 1

你可以在android> = 5.0上运行它.在5.0中,他们为视图添加了高程字段.Elevation定义ViewGroup中的z视图顺序.

在这种情况下,按钮具有非零高程值,进度条具有零值提升.

将进度条的高程设置为例如10dp

<ProgressBar
    ...
    android:elevation="10dp"/>