Question

我有一个带有三个按钮的线性布局，然后是另一个覆盖前一个布局的线性布局。我还需要显示第一个布局中的一个按钮。我怎样才能做到这一点？这是我目前的代码：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center_vertical|center_horizontal|center"
    android:layout_marginBottom="10dp"
    android:layout_marginLeft="85dp"
    android:layout_marginRight="85dp"
    android:layout_marginTop="20dp"
    android:orientation="vertical"
    android:padding="10dp"
    android:screenOrientation="portrait" >

    <Button
        android:id="@+id/fire_help"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_gravity="center_vertical|center_horizontal|center"
        android:layout_marginBottom="30dp"
        android:layout_weight="1"
        android:background="@drawable/fire_help"
        android:text="@string/fire_service"
        android:textColor="@color/White"
        android:textStyle="bold" />

    <Button
        android:id="@+id/police_help"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_gravity="center_vertical|center_horizontal|center"
        android:layout_marginBottom="30dp"
        android:layout_weight="1"
        android:background="@drawable/police_help"
        android:text="@string/police_help"
        android:textColor="@color/White"
        android:textStyle="bold" />

    <Button
        android:id="@+id/medical_help"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_gravity="center_vertical|center_horizontal|center"
        android:layout_marginBottom="10dp"
        android:layout_weight="1"
        android:background="@drawable/medical_help"
        android:padding="10dp"
        android:text="@string/medical_help_description"
        android:textColor="@color/White"
        android:textStyle="bold"
        android:visibility="visible" >

        <requestFocus />
    </Button>
</LinearLayout>

<LinearLayout
    android:id="@+id/overlay"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@color/overlay_background"
    android:clickable="true"
    android:orientation="vertical"
    android:screenOrientation="portrait"
    android:visibility="visible" >

    <TableRow
        android:id="@+id/textRow1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@color/overlay_text_background" >

        <TextView
            android:id="@+id/test_mode"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical|center_horizontal"
            android:gravity="center"
            android:padding="20dp"
            android:text="@string/test_mode"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:textColor="@color/White"
            android:textSize="25sp"
            android:textStyle="bold" />
    </TableRow>

    <TableRow
        android:id="@+id/textRow2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@color/White" >

        <TextView
            android:id="@+id/press_button_text"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:padding="20dp"
            android:text="@string/press_button"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:textSize="16sp"
            android:textStyle="bold" />
    </TableRow>

    <RelativeLayout
        android:id="@+id/overlay_button_layout"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_marginLeft="65dp"
        android:layout_marginRight="65dp"
        android:layout_marginTop="160dp"
        android:layout_marginBottom="20dp"
        android:background="@drawable/white_background"
        android:orientation="vertical"
        android:padding="25dp" >

        <Button
            android:id="@+id/overlay_medical_help"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/medical_help"
            android:padding="10dp"
            android:src="@drawable/medical_help"
            android:text="@string/medical_help_description"
            android:textColor="@color/White"
            android:textStyle="bold"
            android:visibility="visible" >

            <requestFocus />
        </Button>
    </RelativeLayout>
</LinearLayout>

Answer 1

这是你如何做到的以编程方式

 View b = findViewById(R.id.button);
 b.setVisibility(View.GONE);

或xml：

<Button ... 
 android:visibility="gone"/>

显示具有可见性的按钮

1 个答案: