我想用这种结构进行活动:
我们的想法是在顶部放置一些文本,在顶部放置一个横幅,在横幅上放置按钮,在视图中心放置我的画布,使用所有可能的空间。
我正在继承View以绘制我的画布并重载onMeasure()方法:
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// Calculate the size of the board
this.squareSize = MeasureSpec.getSize(widthMeasureSpec) / BOARD_NUM_ROWS;
this.leftMargin = (MeasureSpec.getSize(widthMeasureSpec) - squareSize*BOARD_NUM_COLUMNS) / 2;
this.topMargin = this.leftMargin;
// Set the size of the board to full width and aspect ratio height
int desiredWidth = MeasureSpec.getSize(widthMeasureSpec);
int desiredHeight = this.topMargin + (BOARD_NUM_ROWS * this.squareSize) + this.topMargin;
this.setMeasuredDimension(desiredWidth, desiredHeight);
}
这是我的XML:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context=".DrawLevelActivity"
android:background="@color/activity_background">
<TextView
android:id="@+id/instructionsText"
android:gravity="center"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:paddingLeft="0dp"
android:paddingRight="0dp"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<com.mycanvas.BoardCanvas
android:id="@+id/boardCanvas"
android:gravity="center"
android:layout_below="@+id/instructionsText"
android:layout_centerVertical="true"
android:padding="0dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="@+id/solveButton"
android:gravity="center"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:paddingLeft="30dp"
android:paddingRight="30dp"
android:layout_below="@+id/boardCanvas"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<com.google.ads.AdView
xmlns:googleads="http://schemas.android.com/apk/lib/com.google.ads"
android:id="@+id/adView"
android:gravity="center"
android:paddingTop="0dp"
android:paddingBottom="0dp"
android:paddingLeft="0dp"
android:paddingRight="0dp"
android:layout_alignParentBottom="true"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
googleads:adSize="BANNER"
googleads:adUnitId="@string/admob_id" />
</RelativeLayout>
不幸的是,按钮出现在横幅下面,我认为原因是画布非常大。
onMeasure()中的设置值总是小于MeasureSpec.getSize(heightMeasureSpec)
答案 0 :(得分:1)
此处的关键是使用LinearLayout
为您的画布设置layout_weight
值。这样,顶视图和上视图将包装其内容,并且画布将填充可用空间。布局xml看起来像这样.-
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center_vertical|center_horizontal"
android:background="#990099"
android:text="Some text here" />
<RelativeLayout
android:id="@+id/canvas"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#999900"
android:layout_weight="1">
<!-- The canvas -->
</RelativeLayout>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button" />
<RelativeLayout
android:id="@+id/banner"
android:layout_width="match_parent"
android:layout_height="100dp"
android:background="#009999">
<!-- The banner -->
</RelativeLayout>
</LinearLayout>
注意我设置了一些硬编码的高度和颜色,以便您可以轻松查看结果。此布局将呈现如下视图.-