表面拉丝，unlockCanvasAndPost和抛出：IllegalArgumentException [英] Drawing surface, unlockCanvasAndPost and IllegalArgumentException
本文介绍了表面拉丝，unlockCanvasAndPost和抛出：IllegalArgumentException的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个绘图应用程序的一个问题。下面我有错误，当我离开绘图活动（例如与返回按钮）。我看了看职位，但似乎没有任何帮助我。请，这将意味着很多，如果你可以看看我的drawingsurface活动，因为我一直在试图使它工作了一段时间！非常感谢：）
错误：
03-25 13：41：36.760：E / AndroidRuntime（6642）：致命异常：螺纹423
03-25 13：41：36.760：E / AndroidRuntime（6642）：java.lang.IllegalArgumentException异常
03-25 13：41：36.760：E / AndroidRuntime（6642）：在android.view.Surface.nativeUnlockCanvasAndPost（本机方法）
03-25 13：41：36.760：E / AndroidRuntime（6642）：在android.view.Surface.unlockCanvasAndPost（Surface.java:457）
03-25 13：41：36.760：E / AndroidRuntime（6642）：在android.view.SurfaceView $ 4.unlockCanvasAndPost（SurfaceView.java:812）
03-25 13：41：36.760：E / AndroidRuntime（6642）：在com.ecp.drawing.DrawingSurface $ DrawThread.run（DrawingSurface.java:80）
DrawingSurface的主要code：
公共无效的run（）{
帆布帆布= NULL;
而（_run）{
如果（isDrawing ==真）{
尝试{
帆布= mSurfaceHolder.lockCanvas（NULL）;
如果（mBitmap == NULL）{
mBitmap = Bitmap.createBitmap（1，1，Bitmap.Config.ARGB_8888）;
}
最后帆布C =新的Canvas（mBitmap）; c.drawColor（0，PorterDuff.Mode.CLEAR）;
canvas.drawColor（0，PorterDuff.Mode.CLEAR）;
commandManager.executeAll（C，previewDoneHandler）;
previewPath.draw（C）; canvas.drawBitmap（mBitmap，0，0，NULL）;
} {最后
mSurfaceHolder.unlockCanvasAndPost（画布）;
}
} } }
有已经是一个表面的破坏功能：
公共无效surfaceDestroyed（SurfaceHolder持有人）{
// TODO自动生成方法存根
布尔重试= TRUE;
thread.setRunning（假）;
而（重试）{
尝试{
的Thread.join（）;
重试= FALSE;
}赶上（InterruptedException的E）{
//我们会一次又一次地尝试...
}
}
}
解决方案
我在4.3和阅读，而其他开发人员如何跳过后也有类似的问题的错误我来到了这一点。
步骤要牢记： lockCanvas 画，然后 unlockCanvas
/ **
*注：图纸线程不循环，它只是运行一次，然后退出
* /
@覆盖
公共无效的run（）{
/ *这是不可能发生的，但只是要确定... * /
如果（mSurfaceHolder == NULL || mSurfaceView == NULL）{
返回;
} / **
*为了工作可靠的Nexus 7，我们把〜500ms的延迟，绘制螺纹的开始
*（AOSP - 发行58385）
* /
如果（android.os.Build.BRAND.equalsIgnoreCase（谷歌）及和放大器;
android.os.Build.MANUFACTURER.equalsIgnoreCase（华硕）及和放大器;
android.os.Build.MODEL.equalsIgnoreCase（的Nexus 7））{ Log.w（这一点，睡眠500毫秒（设备：华硕的Nexus 7））; 尝试{
视频下载（500）;
}赶上（InterruptedException的忽略）{
}
} 帆布帆布= NULL; 而（mRunning）{
尝试{
面表面= mSurfaceHolder.getSurface（）; / *检查表面*可用性/
如果（表面=空＆放大器;！＆放大器; surface.isValid（））{ 画布= mSurfaceHolder.lockCanvas（）; 同步（mSurfaceHolder）{
如果（帆布！= NULL）{ // TODO通话绘图code
}
}
} }赶上（例外五）{
Log.e（TAG[绘画主题]，E）; } {最后
/ **
*为此在最后一个，这样如果有异常上述期间抛出，
*我们不会在表面留下不一致的状态
* /
如果（帆布= NULL＆放大器;！＆安培;！mSurfaceHolder = NULL）{
mSurfaceHolder.unlockCanvasAndPost（画布）;
}
}
}
}
我希望这可以帮助别人。 ;）
I have a problem with a drawing application. I have the error below when I leave the drawing activity (with the return button for example). I've looked at the posts but nothing seems to help me. Please, it would mean a lot if you could have a look at my drawingsurface activity, because I've been trying to make it work for a while! Thanks a lot :)
Error :
03-25 13:41:36.760: E/AndroidRuntime(6642): FATAL EXCEPTION: Thread-423
03-25 13:41:36.760: E/AndroidRuntime(6642): java.lang.IllegalArgumentException
03-25 13:41:36.760: E/AndroidRuntime(6642): at android.view.Surface.nativeUnlockCanvasAndPost(Native Method)
03-25 13:41:36.760: E/AndroidRuntime(6642): at android.view.Surface.unlockCanvasAndPost(Surface.java:457)
03-25 13:41:36.760: E/AndroidRuntime(6642): at android.view.SurfaceView$4.unlockCanvasAndPost(SurfaceView.java:812)
03-25 13:41:36.760: E/AndroidRuntime(6642): at com.ecp.drawing.DrawingSurface$DrawThread.run(DrawingSurface.java:80)
Main code of DrawingSurface :
public void run() {
Canvas canvas = null;
while (_run){
if(isDrawing == true){
try{
canvas = mSurfaceHolder.lockCanvas(null);
if(mBitmap == null){
mBitmap = Bitmap.createBitmap (1, 1, Bitmap.Config.ARGB_8888);
}
final Canvas c = new Canvas (mBitmap);
c.drawColor(0, PorterDuff.Mode.CLEAR);
canvas.drawColor(0, PorterDuff.Mode.CLEAR);
commandManager.executeAll(c,previewDoneHandler);
previewPath.draw(c);
canvas.drawBitmap (mBitmap, 0, 0,null);
} finally {
mSurfaceHolder.unlockCanvasAndPost(canvas);
}
}
}
}
There is already a surface destroyed function :
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
boolean retry = true;
thread.setRunning(false);
while (retry) {
try {
thread.join();
retry = false;
} catch (InterruptedException e) {
// we will try it again and again...
}
}
}
解决方案
I had similar issues in 4.3 and after reading a while how other developers bypassed the bug I came to this.
Steps to keep in mind: lockCanvas, draw and then unlockCanvas.
/**
* Note: The drawing thread doesn't loop, it just runs once and exits
*/
@Override
public void run() {
/* This should never happen but just to be sure... */
if (mSurfaceHolder == null || mSurfaceView == null) {
return;
}
/**
* In order to work reliable on Nexus 7, we place ~500ms delay at the start of drawing thread
* (AOSP - Issue 58385)
*/
if (android.os.Build.BRAND.equalsIgnoreCase("google") &&
android.os.Build.MANUFACTURER.equalsIgnoreCase("asus") &&
android.os.Build.MODEL.equalsIgnoreCase("Nexus 7")) {
Log.w(this, "Sleep 500ms (Device: Asus Nexus 7)");
try {
Thread.sleep(500);
} catch (InterruptedException ignored) {
}
}
Canvas canvas = null;
while (mRunning) {
try {
Surface surface = mSurfaceHolder.getSurface();
/* Check availability of surface */
if (surface != null && surface.isValid()) {
canvas = mSurfaceHolder.lockCanvas();
synchronized (mSurfaceHolder) {
if (canvas != null) {
//TODO call drawing code
}
}
}
} catch (Exception e) {
Log.e(TAG, "[Drawing Thread]", e);
} finally {
/**
* Do this in a finally so that if an exception is thrown during the above,
* we don't leave the Surface in an inconsistent state
*/
if (canvas != null && mSurfaceHolder != null) {
mSurfaceHolder.unlockCanvasAndPost(canvas);
}
}
}
}
I hope this can help someone. ;)
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