画布的大小

Question

我有一个Android应用程序,它有几个片段.

在其中一个片段中,有

1. 刻字,
2. 自定义视图,
3. 两个面板与按钮.

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,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.

我试过以下事情:

1. 获取方法中视图的尺寸onSizeChanged(新宽度/高度).
2. 获取方法中视图的尺寸onLayout.
3. 在onDrawmethod(canvas.getWidth()/getHeight(), View.getMeasuredWidth()/getMeasuredHeight())中获取视图的尺寸.

所有三种方法都返回相同的宽度和高度,并且它们都不起作用 - 图形太窄(仅填充可用空间的约60%而不是100%)并且太高(图中的底部不可见) ).

确定RectF自定义视图的尺寸(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(28.03.2013 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>

这是view(@+id/simulation_canvas_view)的代码:

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(31.03.2013 19:38 MSK):如果我从报告的宽度中减去150 onLayout,onSizeChanged或者onMeasure,矩形显示正确.

更新4(05.04.2013 21:07 MSK):这是主要活动的布局:

<?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>

Answer 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，因此它将与其父线性布局具有相同的宽度。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！