位图/画布：java.lang.IllegalArgumentException：宽度和高度必须 > 0
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【中文标题】位图/画布：java.lang.IllegalArgumentException：宽度和高度必须 > 0【英文标题】：Bitmap / Canvas: java.lang.IllegalArgumentException: width and height must be > 0 【发布时间】：2015-02-03 06:45:18 【问题描述】：我正在尝试将波形视觉效果添加到我已经运行的应用程序中，该应用程序将录制声音，然后进行播放。录制/播放代码工作正常，但是当我尝试添加 com.pheelicks.app 可视化器并录制我自己的声音，然后尝试播放时，当我点击自己的播放按钮时出现崩溃。
在他的可视化应用程序中，他提供了自己的 mp3 声音文件，这些文件通过 MediaPlayer 播放。但由于我也通过 MediaPlayer 播放我录制的声音，我认为调整我的代码以包含他的可视化部分应该很容易。但有些不对劲。
奇怪的是，他的代码在我的 android 手机（三星 Galaxy 5）上完美运行，我可以看到音乐的可视化器。
我曾尝试研究类似的问题，但在那里找不到答案。我试过this和this，都是类似的错误，但我没有找到解决办法。
错误似乎来自他的代码，位图部分中的 VisualizerView.java，其中 onDraw() 方法中的 Canvas 调用了 getWidth() 和 getHeight()。我也尝试记录这些值，但它们没有出现在我的LogCat 中。我正在使用安卓工作室。感谢您的帮助！
编辑：
啊，我看到我的Log 语句不起作用，因为它被放置在崩溃点之后。我把它放在崩溃点之前：
if (mCanvasBitmap == null)
mCanvasBitmap = Bitmap.createBitmap(canvas.getWidth(),
canvas.getHeight(), Config.ARGB_8888);
我从 LogCat 得到这个：Value of getWidth is 924 and value of getHeight is 0。那么问题来了，为什么高度为零？
VisualizerView.java
package org.azurespot.waveform;
/**
* Created by mizu on 2/2/15.
*/
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.media.MediaPlayer;
import android.media.audiofx.Visualizer;
import android.util.AttributeSet;
import android.view.View;
import java.util.HashSet;
import java.util.Set;
import static android.util.Log.d;
/**
* A class that draws visualizations of data received from a
* @link Visualizer.OnDataCaptureListener#onWaveFormDataCapture and
* @link Visualizer.OnDataCaptureListener#onFftDataCapture
*/
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);
private 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.setEnabled(false);
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);
d("DEBUG", "Value of getWidth is " + canvas.getWidth()
+ " and value of getHeight is " + canvas.getHeight());
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);
LogCat
02-02 22:31:16.699 19125-19125/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: org.azurespot, PID: 19125
java.lang.IllegalArgumentException: width and height must be > 0
at android.graphics.Bitmap.createBitmap(Bitmap.java:922)
at android.graphics.Bitmap.createBitmap(Bitmap.java:901)
at android.graphics.Bitmap.createBitmap(Bitmap.java:868)
at org.azurespot.waveform.VisualizerView.onDraw(VisualizerView.java:176)
at android.view.View.draw(View.java:15393)
at android.view.View.getDisplayList(View.java:14287)
at android.view.View.getDisplayList(View.java:14329)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3284)
at android.view.View.getDisplayList(View.java:14224)
at android.view.View.getDisplayList(View.java:14329)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3284)
at android.view.View.getDisplayList(View.java:14224)
at android.view.View.getDisplayList(View.java:14329)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3284)
at android.view.View.getDisplayList(View.java:14224)
at android.view.View.getDisplayList(View.java:14329)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3284)
at android.view.View.getDisplayList(View.java:14224)
at android.view.View.getDisplayList(View.java:14329)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3284)
at android.view.View.getDisplayList(View.java:14224)
at android.view.View.getDisplayList(View.java:14329)
at android.view.HardwareRenderer$GlRenderer.buildDisplayList(HardwareRenderer.java:1576)
at android.view.HardwareRenderer$GlRenderer.draw(HardwareRenderer.java:1455)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:2754)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2620)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2188)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1249)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6585)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:803)
at android.view.Choreographer.doCallbacks(Choreographer.java:603)
at android.view.Choreographer.doFrame(Choreographer.java:573)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:789)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5579)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
at dalvik.system.NativeStart.main(Native Method)
【问题讨论】：
也许：***.com/questions/16925317/… 感谢 RC，但它实际上在xml 中。疯了……
【参考方案1】：
原来在我的 xml 中包含我的 VisualizerView 小部件的 FrameLayout 是罪魁祸首！代码是这样来的，来自com.pheelicks.app，所以我没有想到它，因为我之前在0dp 看到过FrameLayout 显示这种类型的大小（在片段中）。但偶然的机会，我决定把它变大，而可视化器确实出现了。当它是这些小东西时，真是太棒了。不遗余力！下面是我的 xml 中的小部件，我将高度更改为 200dp（来自 0dp）并修复了它。
activity_make_sounds.xml
<FrameLayout
android:layout_
android:layout_
android:layout_margin="10dp"
android:background="#000" >
<org.azurespot.waveform.VisualizerView
android:id="@+id/visualizerView"
android:layout_
android:layout_ >
</org.azurespot.waveform.VisualizerView>
</FrameLayout>
【讨论】：
刚刚调整了高度，效果很好。谢谢@Noni A。以上是关于位图/画布：java.lang.IllegalArgumentException：宽度和高度必须 > 0的主要内容，如果未能解决你的问题，请参考以下文章