这是我的 XML 文件。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/bgcategory"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/img_top"
android:layout_width="fill_parent"
android:layout_height="50dip"
android:layout_alignParentTop="true"
android:scaleType="fitXY"
android:src="@drawable/topbar" >
</ImageView>
<ImageView
android:id="@+id/img_back"
android:layout_width="66dp"
android:layout_height="40dp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="5dip"
android:layout_marginTop="5dp"
android:scaleType="fitXY"
android:src="@drawable/btn_back" >
</ImageView>
<ImageView
android:id="@+id/img_share"
android:layout_width="wrap_content"
android:layout_height="35dp"
android:layout_alignBottom="@+id/img_back"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginTop="5dp"
android:scaleType="fitXY"
android:src="@drawable/img_share">
</ImageView>
<TextView
android:id="@+id/txt_audio_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/btn_share"
android:layout_alignTop="@+id/img_back"
android:layout_toLeftOf="@+id/img_share"
android:layout_toRightOf="@+id/img_back"
android:ellipsize="end"
android:gravity="center"
android:singleLine="true"
android:text=""
android:textColor="#fffafa"
android:textSize="16sp"
android:textStyle="bold" >
</TextView>
</RelativeLayout>
<ScrollView
android:id="@+id/scrollview"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<com.example.activities.VisualizerView
android:id="@+id/visualizerView_scroll"
android:layout_width="fill_parent"
android:layout_height="150dp"
android:layout_marginTop="10dip">
</com.example.activities.VisualizerView>
<SeekBar
android:id="@+id/seekbar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/visualizerView_scroll"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:layout_marginTop="20dip"
android:scaleType="fitXY" >
</SeekBar>
<ImageView
android:id="@+id/play"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/seekbar"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dip"
android:scaleType="fitXY"
android:src="@drawable/new_play" >
</ImageView>
<ImageView
android:id="@+id/pause"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/play_scroll"
android:layout_toLeftOf="@+id/play_scroll"
android:scaleType="fitXY"
android:src="@drawable/new_pause" />
<ImageView
android:id="@+id/stop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/play_scroll"
android:layout_toRightOf="@+id/play_scroll"
android:scaleType="fitXY"
android:src="@drawable/new_stop" />
<LinearLayout
android:id="@+id/llCommentContainer"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:layout_below="@+id/play_scroll">
</LinearLayout>
</RelativeLayout>
</ScrollView>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/llCommentContainer">
<ImageView
android:id="@+id/img_comment"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_gravity="right"
android:layout_alignParentBottom="true"
android:clickable="true"
android:src="@drawable/btn_addcomment">
</ImageView>
</RelativeLayout>
这是课程::
public class VisualizerView extends View
{
private static final String TAG = "VisualizerView";
private byte[] mBytes;
private byte[] mFFTBytes;
private Rect mRect = new Rect();
private Visualizer mVisualizer;
private Set<Renderer> mRenderers;
private Paint mFlashPaint = new Paint();
private Paint mFadePaint = new Paint();
public VisualizerView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs);
init();
}
public VisualizerView(Context context, AttributeSet attrs)
{
this(context, attrs, 0);
}
public VisualizerView(Context context)
{
this(context, null, 0);
}
public void init()
{
mBytes = null;
mFFTBytes = null;
mFlashPaint.setColor(Color.argb(122, 255, 255, 255));
mFadePaint.setColor(Color.argb(238, 255, 255, 255)); // Adjust alpha to change how quickly the image fades
mFadePaint.setXfermode(new PorterDuffXfermode(Mode.MULTIPLY));
mRenderers = new HashSet<Renderer>();
}
/**
* Links the visualizer to a player
* @param player - MediaPlayer instance to link to
*/
public void link(MediaPlayer player)
{
if(player == null)
{
throw new NullPointerException("Cannot link to null MediaPlayer");
}
// Create the Visualizer object and attach it to our media player.
mVisualizer = new Visualizer(player.getAudioSessionId());
mVisualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);
// Pass through Visualizer data to VisualizerView
Visualizer.OnDataCaptureListener captureListener = new Visualizer.OnDataCaptureListener()
{
//@Override
public void onWaveFormDataCapture(Visualizer visualizer, byte[] bytes,int samplingRate)
{
updateVisualizer(bytes);
}
//@Override
public void onFftDataCapture(Visualizer visualizer, byte[] bytes,int samplingRate)
{
updateVisualizerFFT(bytes);
}
};
mVisualizer.setDataCaptureListener(captureListener,
Visualizer.getMaxCaptureRate() / 2, true, true);
// Enabled Visualizer and disable when we're done with the stream
mVisualizer.setEnabled(true);
player.setOnCompletionListener(new MediaPlayer.OnCompletionListener()
{
//@Override
public void onCompletion(MediaPlayer mediaPlayer)
{
mVisualizer.setEnabled(false);
}
});
}
public void addRenderer(Renderer renderer)
{
if(renderer != null)
{
mRenderers.add(renderer);
}
}
public void clearRenderers()
{
mRenderers.clear();
}
/**
* Call to release the resources used by VisualizerView. Like with the
* MediaPlayer it is good practice to call this method
*/
public void release()
{
mVisualizer.release();
}
/**
* Pass data to the visualizer. Typically this will be obtained from the
* Android Visualizer.OnDataCaptureListener call back. See
* {@link Visualizer.OnDataCaptureListener#onWaveFormDataCapture }
* @param bytes
*/
public void updateVisualizer(byte[] bytes) {
mBytes = bytes;
invalidate();
}
/**
* Pass FFT data to the visualizer. Typically this will be obtained from the
* Android Visualizer.OnDataCaptureListener call back. See
* {@link Visualizer.OnDataCaptureListener#onFftDataCapture }
* @param bytes
*/
public void updateVisualizerFFT(byte[] bytes) {
mFFTBytes = bytes;
invalidate();
}
boolean mFlash = false;
/**
* Call this to make the visualizer flash. Useful for flashing at the start
* of a song/loop etc...
*/
public void flash() {
mFlash = true;
invalidate();
}
Bitmap mCanvasBitmap;
Canvas mCanvas;
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// Create canvas once we're ready to draw
mRect.set(0, 0, getWidth(), getHeight());
if(mCanvasBitmap == null)
{
mCanvasBitmap = Bitmap.createBitmap(canvas.getWidth(), canvas.getHeight(), Config.ARGB_8888);
}
if(mCanvas == null)
{
mCanvas = new Canvas(mCanvasBitmap);
}
if (mBytes != null) {
// Render all audio renderers
AudioData audioData = new AudioData(mBytes);
for(Renderer r : mRenderers)
{
r.render(mCanvas, audioData, mRect);
}
}
if (mFFTBytes != null) {
// Render all FFT renderers
FFTData fftData = new FFTData(mFFTBytes);
for(Renderer r : mRenderers)
{
r.render(mCanvas, fftData, mRect);
}
}
// Fade out old contents
mCanvas.drawPaint(mFadePaint);
if(mFlash)
{
mFlash = false;
mCanvas.drawPaint(mFlashPaint);
}
canvas.drawBitmap(mCanvasBitmap, new Matrix(), null);
}
}
我的错误日志:::
java.lang.ClassNotFoundException: android.media.audiofx.Visualizer$OnDataCaptureListener
at com.android.ide.eclipse.adt.internal.resources.manager.ProjectClassLoader.findClass(ProjectClassLoader.java:105)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2406)
at java.lang.Class.getConstructor0(Class.java:2716)
at java.lang.Class.getConstructor(Class.java:1674)
at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.instantiateClass(ProjectCallback.java:327)
at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.loadView(ProjectCallback.java:166)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:207)
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:135)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:739)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:711)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:742)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:711)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:742)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:711)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:372)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:321)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:322)
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:372)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge(GraphicalEditorPart.java:1640)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.recomputeLayout(GraphicalEditorPart.java:1391)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.activated(GraphicalEditorPart.java:1165)
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditorDelegate.delegatePageChange(LayoutEditorDelegate.java:679)
at com.android.ide.eclipse.adt.internal.editors.common.CommonXmlEditor.pageChange(CommonXmlEditor.java:359)
at org.eclipse.ui.part.MultiPageEditorPart$2.widgetSelected(MultiPageEditorPart.java:292)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1276)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1300)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1285)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1079)
at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3023)
at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1730)
at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:270)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1276)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3554)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3179)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1022)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:916)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:585)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:540)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
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:353)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
at org.eclipse.equinox.launcher.Main.main(Main.java:1414)
现在，当用户单击播放按钮时，我正在尝试使用此可视化视图。但是在我的文件图形布局中，我收到“无法实例化以下类”的消息，我也无法在视图中显示我的 imageview（即 imgComment）。有什么建议我错了吗？ ?
提前致谢....