Android：Html TextView - 有可能吗？

Question

我有兴趣创建一个自定义的android组件，它扩展了textview，并将其中的文本显示为格式。 这是我写的代码：

/** * TODO */

import android.content.Context; 
import android.graphics.Canvas; 
import android.text.Html; 
import android.util.AttributeSet; 
import android.widget.TextView; 

public class HtmlTextView extends TextView { 

    private static final String tag = "HtmlTextView"; 

    public HtmlTextView(Context context, AttributeSet attrs, 
      int defStyle) { 
     super(context, attrs, defStyle); 
    } 

    public HtmlTextView(Context context, AttributeSet attrs) { 
     super(context, attrs); 
    } 

    public HtmlTextView(Context context) { 
     super(context); 
    } 

    /* 
    * (non-Javadoc) 
    * 
    * @see android.widget.TextView#onDraw(android.graphics.Canvas) 
    */ 
    @Override 
    protected void onDraw(Canvas canvas) { 


       setText(Html.fromHtml((String) getText())); 


     super.onDraw(canvas); 
    } 

} 

，并在测试布局XML我有以下几点：

<com.package.ui.tools.HtmlTextView 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/elad" 
    android:textSize="28dip" 
    android:padding="10dip" 
    android:gravity="center"/> 

中定义的字符串strings.xml是：

<!-- testing --> 
<string name="elad">elad <b> elad </b> elad</string> 

这个d oesnt工作，但奇怪的，这是我得到以下异常抛出在eclipse：

java.lang.NoClassDefFoundError: org/ccil/cowan/tagsoup/Parser 
at android.text.Html.fromHtml(Html.java:125) 
at android.text.Html.fromHtml(Html.java:102) 
at com.package.ui.tools.HtmlTextView.onDraw(HtmlTextView.java:39) 
at android.view.View.draw(View.java:6740) 
at android.view.ViewGroup.drawChild(ViewGroup.java:1640) 
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367) 
at android.view.ViewGroup.drawChild(ViewGroup.java:1638) 
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367) 
at android.view.View.draw(View.java:6743) 
at android.widget.FrameLayout.draw(FrameLayout.java:352) 
at com.android.layoutlib.bridge.Bridge.computeLayout(Bridge.java:452) 
at com.android.ide.common.rendering.LayoutLibrary.createLegacySession(LayoutLibrary.java:404) 
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:285) 
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge(GraphicalEditorPart.java:1506) 
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge(GraphicalEditorPart.java:1312) 
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.recomputeLayout(GraphicalEditorPart.java:1043) 
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.activated(GraphicalEditorPart.java:870) 
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditor.partActivated(LayoutEditor.java:378) 
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditor.partBroughtToTop(LayoutEditor.java:387) 
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.Widget.sendEvent(Widget.java:1053) 
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077) 
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062) 
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:774) 
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.Widget.sendEvent(Widget.java:1053) 
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4066) 
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657) 
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(Unknown Source) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
at java.lang.reflect.Method.invoke(Unknown Source) 
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619) 
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574) 
at org.eclipse.equinox.launcher.Main.run(Main.java:1407) 

没有人有任何想法，为什么我得到这个错误？ 我试图实现甚至可能吗？ 谢谢， e。

Answer 1

TextView的类已经使用Html.fromHtml所以我不认为你需要创建一个HtmlTextView支持一些基本的HTML标签。

内部的SDK使用的TagSoup来解析HTML（这是缺少类）。我假设你在设计模式下查看你的布局时会得到这个Eclipse异常。为了让您的自定义视图在Eclipse视图中正确呈现，您需要做一些特殊的事情。

无论哪种方式，我认为你可以使用基本的TextView您的需求。

更新：

字符串中的strings.xml可以包括与TextView的使用HTML。

Answer 2

试试看：

normalTextView.setText(Html.fromHtml("<bold>Hello World!</bold>")); 

对于处理strings.xml你需要逃避某些字符作为this answer。这里给出的例子是：

<resources> 
    <string name="somestring"> 
     &lt;B&gt;Title&lt;/B&gt;&lt;BR/&gt; 
     Content 
    </string> 
</resources> 

正如Robby提到的那样，这是您在使用字符串编辑器时自动完成的。