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自定义视图不在 xml 布局 android 中居中

发布于 2024-12-10 21:21:53 字数 9842 浏览 0 评论 0原文

我有一个自定义视图，我必须将其放入线性布局中并放置layout_gravity = center。 这是自定义视图：

public class GIFView extends View{        
    private Movie movie;  
private InputStream is;  
private long moviestart;  

public GIFView(Context context) {  
    super(context);
    is=context.getResources().openRawResource(R.drawable.anim_cerca);
    movie=Movie.decodeStream(is);
}
public GIFView(Context context, AttributeSet attrs)
{
    super(context, attrs);
    is=context.getResources().openRawResource(R.drawable.anim_cerca);
    movie=Movie.decodeStream(is);
}

public GIFView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    is=context.getResources().openRawResource(R.drawable.anim_cerca);
    movie=Movie.decodeStream(is);
}

@Override  
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    long now=android.os.SystemClock.uptimeMillis();
    Paint p = new Paint();
    p.setAntiAlias(true);
    if (moviestart == 0) 
        moviestart = now;

    int relTime = (int)((now - moviestart) % movie.duration());
    movie.setTime(relTime);
    movie.draw(canvas,0,0);
    this.invalidate();
}                         
}

这是我的 xml ：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent" android:background="@drawable/sfondo">
<LinearLayout android:id="@+id/linearLayout2"
    android:layout_height="wrap_content" android:layout_width="match_parent"
    android:orientation="vertical">
    <LinearLayout android:id="@+id/linearLayout1"
        android:layout_height="fill_parent" android:weightSum="1"
        android:layout_width="fill_parent" android:orientation="horizontal">
        <ImageView android:layout_height="wrap_content" android:id="@+id/imageView1"
            android:src="@drawable/trovachiavi" android:layout_width="wrap_content"
            android:layout_marginTop="10dp" android:layout_marginLeft="5dp"></ImageView>
        <ImageButton android:id="@+id/infoButton"
            android:background="@null" android:layout_height="47dp"
            android:layout_marginLeft="5dip" android:layout_weight="0.25"
            android:layout_marginTop="15dip" android:src="@drawable/info_mini"
            android:layout_width="47dp">
        </ImageButton>
    </LinearLayout>
</LinearLayout>
<ImageButton android:id="@+id/avvia_cerca"
    android:background="@null" android:layout_gravity="center|bottom"
    android:layout_height="wrap_content" android:layout_width="wrap_content"
    android:layout_marginTop="10dp"></ImageButton>
<LinearLayout android:id="@+id/layoutGIF"
    android:layout_height="wrap_content" android:layout_width="wrap_content"
    android:orientation="vertical">
    <spazio.digitale.com.GIFView android:id="@+id/gIFView1"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:layout_gravity="center"></spazio.digitale.com.GIFView>
</LinearLayout>
</LinearLayout>

当我在 eclipse 中打开图形工具来设计 xml 时，它给我这个错误：

java.lang.NullPointerException
at spazio.digitale.com.GIFView.onDraw(GIFView.java:43)
at android.view.View.draw(View.java:6880)
at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
at android.view.View.draw(View.java:6883)
at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
at android.view.View.draw(View.java:6883)
at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
at android.view.View.draw(View.java:6883)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.render(RenderSessionImpl.java:466)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:320)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:325)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.RenderService.createRenderSession(RenderService.java:380)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge(GraphicalEditorPart.java:1310)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.recomputeLayout(GraphicalEditorPart.java:1075)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.activated(GraphicalEditorPart.java:901)
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditor.partActivated(LayoutEditor.java:416)
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditor.partBroughtToTop(LayoutEditor.java:425)
at org.eclipse.ui.internal.PartListenerList$2.run(PartListenerList.java:87)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.runtime.Platform.run(Platform.java:888)
at org.eclipse.ui.internal.PartListenerList.fireEvent(PartListenerList.java:57)
at org.eclipse.ui.internal.PartListenerList.firePartBroughtToTop(PartListenerList.java:85)
at org.eclipse.ui.internal.PartService.firePartBroughtToTop(PartService.java:208)
at org.eclipse.ui.internal.WorkbenchPagePartList.firePartBroughtToTop(WorkbenchPagePartList.java:76)
at org.eclipse.ui.internal.WorkbenchPagePartList.fireActiveEditorChanged(WorkbenchPagePartList.java:52)
at org.eclipse.ui.internal.PartList.setActiveEditor(PartList.java:162)
at org.eclipse.ui.internal.WorkbenchPage.makeActiveEditor(WorkbenchPage.java:1281)
at org.eclipse.ui.internal.WorkbenchPage.setActivePart(WorkbenchPage.java:3530)
at org.eclipse.ui.internal.WorkbenchPage.requestActivation(WorkbenchPage.java:3077)
at org.eclipse.ui.internal.PartPane.requestActivation(PartPane.java:279)
at org.eclipse.ui.internal.EditorPane.requestActivation(EditorPane.java:98)
at org.eclipse.ui.internal.PartPane.setFocus(PartPane.java:325)
at org.eclipse.ui.internal.EditorPane.setFocus(EditorPane.java:127)
at org.eclipse.ui.internal.PartStack.presentationSelectionChanged(PartStack.java:844)
at org.eclipse.ui.internal.PartStack.access$1(PartStack.java:827)
at org.eclipse.ui.internal.PartStack$1.selectPart(PartStack.java:137)
at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation$1.handleEvent(TabbedStackPresentation.java:133)
at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:269)
at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:278)
at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder.access$1(DefaultTabFolder.java:1)
at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder$2.handleEvent(DefaultTabFolder.java:88)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:3783)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1375)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1398)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1383)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1195)
at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:2743)
at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1429)
at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:257)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:3783)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1375)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1398)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1383)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1195)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3629)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3284)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
at org.eclipse.equinox.launcher.Main.run(Main.java:1408)

如果我将自定义视图放在其他元素之上，在设备上运行它，这些元素将不会显示。由于 xml 在这里完成，我将所有其他元素放在自定义视图上方，因此它们会显示，但自定义视图不在布局中居中。我能做些什么？

原文

i have a custom view and i have to put it in a linearlayout and put layout_gravity=center.
This is the custom view:

public class GIFView extends View{        
    private Movie movie;  
private InputStream is;  
private long moviestart;  

public GIFView(Context context) {  
    super(context);
    is=context.getResources().openRawResource(R.drawable.anim_cerca);
    movie=Movie.decodeStream(is);
}
public GIFView(Context context, AttributeSet attrs)
{
    super(context, attrs);
    is=context.getResources().openRawResource(R.drawable.anim_cerca);
    movie=Movie.decodeStream(is);
}

public GIFView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    is=context.getResources().openRawResource(R.drawable.anim_cerca);
    movie=Movie.decodeStream(is);
}

@Override  
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    long now=android.os.SystemClock.uptimeMillis();
    Paint p = new Paint();
    p.setAntiAlias(true);
    if (moviestart == 0) 
        moviestart = now;

    int relTime = (int)((now - moviestart) % movie.duration());
    movie.setTime(relTime);
    movie.draw(canvas,0,0);
    this.invalidate();
}                         
}

This is my xml :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent" android:background="@drawable/sfondo">
<LinearLayout android:id="@+id/linearLayout2"
    android:layout_height="wrap_content" android:layout_width="match_parent"
    android:orientation="vertical">
    <LinearLayout android:id="@+id/linearLayout1"
        android:layout_height="fill_parent" android:weightSum="1"
        android:layout_width="fill_parent" android:orientation="horizontal">
        <ImageView android:layout_height="wrap_content" android:id="@+id/imageView1"
            android:src="@drawable/trovachiavi" android:layout_width="wrap_content"
            android:layout_marginTop="10dp" android:layout_marginLeft="5dp"></ImageView>
        <ImageButton android:id="@+id/infoButton"
            android:background="@null" android:layout_height="47dp"
            android:layout_marginLeft="5dip" android:layout_weight="0.25"
            android:layout_marginTop="15dip" android:src="@drawable/info_mini"
            android:layout_width="47dp">
        </ImageButton>
    </LinearLayout>
</LinearLayout>
<ImageButton android:id="@+id/avvia_cerca"
    android:background="@null" android:layout_gravity="center|bottom"
    android:layout_height="wrap_content" android:layout_width="wrap_content"
    android:layout_marginTop="10dp"></ImageButton>
<LinearLayout android:id="@+id/layoutGIF"
    android:layout_height="wrap_content" android:layout_width="wrap_content"
    android:orientation="vertical">
    <spazio.digitale.com.GIFView android:id="@+id/gIFView1"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:layout_gravity="center"></spazio.digitale.com.GIFView>
</LinearLayout>
</LinearLayout>

When i open graphical tool in eclipse to design xml, it give me this error:

java.lang.NullPointerException
at spazio.digitale.com.GIFView.onDraw(GIFView.java:43)
at android.view.View.draw(View.java:6880)
at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
at android.view.View.draw(View.java:6883)
at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
at android.view.View.draw(View.java:6883)
at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
at android.view.View.draw(View.java:6883)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.render(RenderSessionImpl.java:466)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:320)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:325)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.RenderService.createRenderSession(RenderService.java:380)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge(GraphicalEditorPart.java:1310)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.recomputeLayout(GraphicalEditorPart.java:1075)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.activated(GraphicalEditorPart.java:901)
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditor.partActivated(LayoutEditor.java:416)
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditor.partBroughtToTop(LayoutEditor.java:425)
at org.eclipse.ui.internal.PartListenerList$2.run(PartListenerList.java:87)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.runtime.Platform.run(Platform.java:888)
at org.eclipse.ui.internal.PartListenerList.fireEvent(PartListenerList.java:57)
at org.eclipse.ui.internal.PartListenerList.firePartBroughtToTop(PartListenerList.java:85)
at org.eclipse.ui.internal.PartService.firePartBroughtToTop(PartService.java:208)
at org.eclipse.ui.internal.WorkbenchPagePartList.firePartBroughtToTop(WorkbenchPagePartList.java:76)
at org.eclipse.ui.internal.WorkbenchPagePartList.fireActiveEditorChanged(WorkbenchPagePartList.java:52)
at org.eclipse.ui.internal.PartList.setActiveEditor(PartList.java:162)
at org.eclipse.ui.internal.WorkbenchPage.makeActiveEditor(WorkbenchPage.java:1281)
at org.eclipse.ui.internal.WorkbenchPage.setActivePart(WorkbenchPage.java:3530)
at org.eclipse.ui.internal.WorkbenchPage.requestActivation(WorkbenchPage.java:3077)
at org.eclipse.ui.internal.PartPane.requestActivation(PartPane.java:279)
at org.eclipse.ui.internal.EditorPane.requestActivation(EditorPane.java:98)
at org.eclipse.ui.internal.PartPane.setFocus(PartPane.java:325)
at org.eclipse.ui.internal.EditorPane.setFocus(EditorPane.java:127)
at org.eclipse.ui.internal.PartStack.presentationSelectionChanged(PartStack.java:844)
at org.eclipse.ui.internal.PartStack.access$1(PartStack.java:827)
at org.eclipse.ui.internal.PartStack$1.selectPart(PartStack.java:137)
at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation$1.handleEvent(TabbedStackPresentation.java:133)
at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:269)
at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:278)
at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder.access$1(DefaultTabFolder.java:1)
at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder$2.handleEvent(DefaultTabFolder.java:88)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:3783)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1375)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1398)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1383)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1195)
at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:2743)
at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1429)
at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:257)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:3783)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1375)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1398)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1383)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1195)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3629)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3284)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
at org.eclipse.equinox.launcher.Main.run(Main.java:1408)

If i put the custom view above other elements, running it on device, these elements will not show. As xml is done here, i put all the other elements above the custom view, so they are shown but the custom view is not centred in layout. What can i do?

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评论（1）

指尖上的星空 2024-12-17 21:21:53

你可以使用

<LinearLayout android:id="@+id/layoutGIF"
    android:layout_height="wrap_content" android:layout_width="wrap_content"
    android:orientation="vertical" android:weightSum="1">
    <spazio.digitale.com.GIFView android:id="@+id/gIFView1"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:layout_gravity="center"
android:layout_weight="0.8"></spazio.digitale.com.GIFView>
</LinearLayout>

，但我建议你使用 Animation 而不是 gif

You could use

<LinearLayout android:id="@+id/layoutGIF"
    android:layout_height="wrap_content" android:layout_width="wrap_content"
    android:orientation="vertical" android:weightSum="1">
    <spazio.digitale.com.GIFView android:id="@+id/gIFView1"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:layout_gravity="center"
android:layout_weight="0.8"></spazio.digitale.com.GIFView>
</LinearLayout>

but i advice you to use Animation instead gif

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