我有一个Android应用程序,它有几个片段。
在其中一个片段中,有
在自定义视图(第2项)中,我需要绘制几个图形,其中一个图形与视图的大小相关联,i。即应该有一个带有圆边的矩形,其大小等于画布的大小减去填充。
为了做到这一点,我需要获得画布的宽度和高度。
我尝试了以下事项:
onSizeChanged
中获取视图的尺寸(新的宽度/高度)。onLayout
中获取视图的尺寸。onDraw
方法(canvas.getWidth()/getHeight(), View.getMeasuredWidth()/getMeasuredHeight()
)获取视图的尺寸。所有三种方法都返回相同的宽度和高度,并且所有这些方法都不起作用 - 数字太窄(仅填充可用空间的约60%而不是100%)并且太高(图的底部)不可见)。
确定自定义视图的维度(RectF
实例)的正确方法是什么?
请注意,我在横向模式下在Nexus 7仿真器上测试此应用程序。
更新1(2013年3月28日21:42 MSK)
相应片段的XML文件:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/simulation_fragment"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Simulation"
android:textAppearance="?android:attr/textAppearanceLarge" />
<co.mycompany.ccp.android.impl.simulationcanvas.SimulationCanvasView
android:id="@+id/simulation_canvas_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.8" />
<LinearLayout
android:id="@+id/simulationExecutionPanel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.1" >
<Button
android:id="@+id/restartSimulationButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/restart_simulation" />
<Button
android:id="@+id/simulationStepButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/simulation_step" />
<Button
android:id="@+id/pauseButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/pause" />
<Button
android:id="@+id/continueButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/continue_button" />
<Button
android:id="@+id/simulateAdInfinitumButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/simulate_ad_infinitum" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/currentCycleLabel" />
<TextView
android:id="@+id/currentCycleIndicator"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Cycle"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.1" >
<Button
android:id="@+id/addCompanyButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/add_company2" />
<Button
android:id="@+id/removeCompanyButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/remove_company" />
<Button
android:id="@+id/setLabourForceButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/set_labour_force" />
</LinearLayout>
</LinearLayout>
以下是视图的代码(@+id/simulation_canvas_view
):
import co.mycompany.ccp.android.api.economypartsdimensioncalculator.EconomyPartsDimensionCalculator;
import co.mycompany.ccp.android.api.systemboundary.SystemBoundaryGraphicsCalculator;
import co.mycompany.ccp.android.impl.economypartsdimensioncalculator.DefaultEconomyPartsDimensionCalculator;
import co.mycompany.ccp.android.impl.systemboundary.DefaultSystemBoundaryGraphicsCalculator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
/**
* @author DP118M
*
*/
public class SimulationCanvasView extends View {
private static final int SYSTEM_BOUNDARY_COLOUR = Color.LTGRAY;
[...]
private int width = -1;
private int height= -1;
private SystemBoundaryGraphicsCalculator systemBoundaryGraphicsCalculator = new DefaultSystemBoundaryGraphicsCalculator();
[...]
private Rect systemBoundaryDimensions = new Rect(100, 100, 100 + 100,
100 + 100);
private Rect externalEconomyDimensions;
[...]
public SimulationCanvasView(final Context aContext) {
super(aContext);
}
public SimulationCanvasView(final Context context, final AttributeSet attrs) {
super(context, attrs);
}
public SimulationCanvasView(final Context context,
final AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
[...]
private void updateSystemBoundaryGraphicsCalculatorDimensions() {
systemBoundaryGraphicsCalculator.setCanvasHeight(height);
systemBoundaryGraphicsCalculator.setCanvasWidth(width);
try {
systemBoundaryGraphicsCalculator.run();
systemBoundaryDimensions = systemBoundaryGraphicsCalculator
.getSystemBoundaryDimensions();
} catch (final Exception exception) {
throw new RuntimeException(exception);
}
}
@Override
protected void onDraw(final Canvas aCanvas) {
super.onDraw(aCanvas);
this.width = this.getWidth();
this.height = this.getHeight();
updateSystemBoundaryGraphicsCalculatorDimensions();
[...]
drawRectangleWithRoundedEdges(aCanvas, systemBoundaryDimensions,
SYSTEM_BOUNDARY_COLOUR);
[...]
}
private void drawRectangleWithRoundedEdges(final Canvas aCanvas,
final Rect aDimensions, int aStrokeColour) {
final Paint paint = new Paint();
paint.setColor(aStrokeColour);
paint.setStrokeWidth(1);
paint.setStyle(Paint.Style.STROKE);
aCanvas.drawRoundRect(new RectF(aDimensions), 20, 20, paint);
}
}
这是用于计算圆角矩形尺寸的类:
package co.mycompany.ccp.android.impl.systemboundary;
import android.graphics.Rect;
import co.mycompany.ccp.android.api.systemboundary.SystemBoundaryGraphicsCalculator;
/**
* @author DP118M
*
*/
public class DefaultSystemBoundaryGraphicsCalculator implements
SystemBoundaryGraphicsCalculator {
private int canvasWidth;
private int canvasHeight;
private int xPadding = SYSTEM_BOUNDARY_X_PADDING;
private int yPadding = SYSTEM_BOUNDARY_Y_PADDING;
private Rect systemBoundaryDimensions;
public void setXPadding(final int xPadding) {
this.xPadding = xPadding;
}
public void setYPadding(final int yPadding) {
this.yPadding = yPadding;
}
@Override
public Rect getSystemBoundaryDimensions() {
return systemBoundaryDimensions;
}
@Override
public void setCanvasWidth(final int width) {
this.canvasWidth = width;
}
@Override
public void setCanvasHeight(final int height) {
this.canvasHeight = height;
}
@Override
public void run() throws Exception {
this.systemBoundaryDimensions = new Rect(0 + xPadding, 0 + yPadding,
Math.max(this.canvasWidth - xPadding, 0), Math.max(
this.canvasHeight - yPadding, 0));
}
}
更新2 :
这是截图:
更新3(2013年3月31日19:38 MSK):如果我从onLayout
,onSizeChanged
或onMeasure
报告的宽度中减去150,矩形显示正确。
更新4(05.04.2013 21:07 MSK):以下是主要活动的布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<fragment
android:id="@+id/menu_pane"
android:layout_width="0px"
android:layout_height="match_parent"
android:layout_weight="1"
class="co.altruix.ccp.android.impl.fragments.MenuFragment" />
<FrameLayout
android:id="@+id/content_fragment2"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
class="co.altruix.ccp.android.impl.fragments.ContentFragment2"/>
</LinearLayout>
答案 0 :(得分:2)
我看到android:layout_height="wrap_content"
的自定义视图。
在这种情况下,父/容器ViewGroup
想要在测量此视图时知道内容的高度。
但是,要绘制内容,您需要依赖于布局测量的尺寸,而布局仍然不知道内容的高度。
将android:layout_height
设置为0dp
,这将允许使用android:layout_weight
属性,然后视图将根据可用空间预先测量高度。
此外,当再次测量布局时,onSizeChanged()
足以告知您有关尺寸更改的信息。
答案 1 :(得分:1)
试试这个:
view.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener(){
@Override
public void onGlobalLayout() {
//capture view width and height here
}//end onGlobalLayout()
});
答案 2 :(得分:1)
根据我对这个问题的评论:
您的顶级布局:您已将content_fragment2的宽度设置为fill_parent,因此它的宽度与其parent linearlayout的宽度相同。您可能希望menu_pane具有固定宽度,没有layout_weight,并且content_fragment2具有layout_width = 0px和layout_weight = 1。
很高兴这有帮助!