问题描述
我有一些适用于 Android 2.1 和 2.2 的拍照代码.但是这些代码在 Android 2.3 中被破坏了.在花时间解决了这个徒劳无功的问题后,我想在这里寻求帮助.
I have some codes of taking picture which works in Android 2.1 and 2.2.But these codes broke at Android 2.3.After spending time to fix this issue which went in vain, I would like to ask for help here.
我的拍照代码流程是这样的:
My code flow to take picture is like this:
创建一个类 Camlayer 扩展 SurfaceView
public class CamLayer extends SurfaceView implements SurfaceHolder.Callback {
private void init(Context context){
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
mCamera = Camera.open();
}
public CamLayer(Context context) {
super(context);
init(context);
}
public CamLayer(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
Log.i(TAG+".surfaceChanged", "being called!");
Log.i(TAG+".surfaceChanged", "w="+w);
Log.i(TAG+".surfaceChanged", "h="+h);
if (isPreviewRunning) {
mCamera.stopPreview();
}
try {
mCamera.setPreviewDisplay(holder);
mCamera.setPreviewCallback(mPreviewCallback);
} catch (IOException e) {
Log.e(TAG+".surfaceCreated", "mCamera.setPreviewDisplay(holder);");
}
Camera.Parameters p = mCamera.getParameters();
setOptimalSize(p, w, h, SIZEOFPREVIEW);
setOptimalSize(p, w, h, SIZEOFPICTURE);
mCamera.setParameters(p);
mCamera.startPreview();
isPreviewRunning = true;
}
public void takePicture(){
Log.i(TAG+".takePicture", "being called!");
mCamera.takePicture(null, null, mPictureCallback);
Log.i(TAG+".takePicture", "call ended!");
}
}
CamLayer.takePicture()
会被外部类调用启动.
问题是在Android 2.3.3,takePicture
会挂掉,所以发现了ANR问题.在 /data/anr/traces.txt
中,可以找到以下内容.如您所见,native_takePicture
永远不会返回.
The problem is that at Android 2.3.3, the takePicture
will hang, so an ANR problem is found. In /data/anr/traces.txt
, below are found. As you can see, the native_takePicture
never returns.
达尔维克线程:
(mutexes: tll=0 tsl=0 tscl=0 ghl=0 hwl=0 hwll=0)
"main" prio=5 tid=1 NATIVE
| group="main" sCount=1 dsCount=0 obj=0x40022170 self=0xce68
| sysTid=2411 nice=0 sched=0/0 cgrp=default handle=-1345006464
at android.hardware.Camera.native_takePicture(Native Method)
at android.hardware.Camera.takePicture(Camera.java:746)
at android.hardware.Camera.takePicture(Camera.java:710)
at oms.cj.tube.camera.CamLayer.takePicture(CamLayer.java:256)
at oms.cj.tube.camera.DefineColor.takePicture(DefineColor.java:61)
at oms.cj.tube.camera.DefineColor.onKeyUp(DefineColor.java:71)
at android.view.KeyEvent.dispatch(KeyEvent.java:1280)
at android.app.Activity.dispatchKeyEvent(Activity.java:2078)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:16
66)
at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2571)
at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2546)
at android.view.ViewRoot.handleMessage(ViewRoot.java:1878)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:3691)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
at dalvik.system.NativeStart.main(Native Method)
有人遇到同样的问题吗?并且知道如何解决它?
Is there anybody having the same problem? And know how to fix it?
推荐答案
我也观察到 mCamera.takePicture(null, null, handler) 卡住了.我尝试在调用 takePicture() 之前清除预览处理程序:mCamera.setPreviewCallback(null),现在它可以工作了.
I also observed mCamera.takePicture(null, null, handler) to freeze. I tried to clear the preview handler: mCamera.setPreviewCallback(null) before calling takePicture(), and it works now.
这篇关于takepicture 在 Android 2.3.3 上挂起的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!