camera.setParameters失败的android [英] camera.setParameters failed in android
问题描述
我已经包含在我的应用程序中的拍摄功能。我曾经也推出了应用程序在市场上。我得到一个错误消息,他收到一个错误,同时打开相机的用户之一。
我已经测试设备上的应用程序在2.1。我从用户得到的是使用的Nexus One的错误,将主要运行2.2 ...以下是我已经收到了logcat的错误...
java.lang.RuntimeException的:setParameters失败
在android.hardware.Camera.native_setParameters(本机方法)
在android.hardware.Camera.setParameters(Camera.java:647)
在com.CameraApp preview.surfaceChanged(preview.java:67)。
在android.view.SurfaceView.updateWindow(SurfaceView.java:538)
在android.view.SurfaceView.dispatchDraw(SurfaceView.java:339)
在android.view.ViewGroup.drawChild(ViewGroup.java:1638)
在android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
在android.view.ViewGroup.drawChild(ViewGroup.java:1638)
在android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
在android.view.ViewGroup.drawChild(ViewGroup.java:1638)
在android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
在android.view.View.draw(View.java:6743)
在android.widget.FrameLayout.draw(FrameLayout.java:352)
在android.view.ViewGroup.drawChild(ViewGroup.java:1640)
在android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
在android.view.View.draw(View.java:6743)
在android.widget.FrameLayout.draw(FrameLayout.java:352)
在com.android.internal.policy.impl.PhoneWindow $ DecorView.draw(PhoneWindow.java:1842)
在android.view.ViewRoot.draw(ViewRoot.java:1407)
在android.view.ViewRoot.performTraversals(ViewRoot.java:1163)
在android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
在android.os.Handler.dispatchMessage(Handler.java:99)
在android.os.Looper.loop(Looper.java:123)
在android.app.ActivityThread.main(ActivityThread.java:4627)
在java.lang.reflect.Method.invokeNative(本机方法)
在java.lang.reflect.Method.invoke(Method.java:521)
在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:868)
在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
在dalvik.system.NativeStart.main(本机方法)
我跑了应用程序的2.2模拟器还进行检查。但它工作得很好。谁能告诉我,为什么错误发生?
下面是我在评论中提到的类:
类preVIEW延伸SurfaceView实现SurfaceHolder.Callback
{
私有静态最后字符串变量=preVIEW;
SurfaceHolder mHolder;
公共摄像头摄像头;
preVIEW(上下文的背景下)
{
超(上下文);
//安装SurfaceHolder.Callback所以我们得到通知时,该
//下垫面创建和销毁。
mHolder = getHolder();
mHolder.addCallback(本);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
公共无效surfaceCreated(SurfaceHolder持有人)
{
//表面经创建,获取摄像机,并告诉它在哪里
//绘制。
相机= Camera.open();
尝试 {
camera.set previewDisplay(保持器);
}赶上(IOException异常除外){
camera.release();
摄像头= NULL;
// TODO:在此处添加更多的异常处理逻辑
}
}
公共无效surfaceDestroyed(SurfaceHolder持有人)
{
//面,当我们返回将被销毁,所以停止了preVIEW。
//因为CameraDevice对象不是共享资源,这是非常
//重要的是要释放它当活动被暂停。
camera.stop preVIEW();
camera.release();
摄像头= NULL;
}
公共无效surfaceChanged(SurfaceHolder持有人,INT格式,INT W,INT高)
{
//现在的尺寸是已知的,设置相机参数,并开始
//在preVIEW。
Camera.Parameters参数= camera.getParameters();
parameters.set previewSize(W,H);
camera.setParameters(参数);
camera.start preVIEW();
}
@覆盖
公共无效画(油画画布)
{
super.draw(画布);
涂料P =新的油漆(Color.RED);
Log.d(TAG,画);
canvas.drawText(preVIEW,canvas.getWidth()/ 2,canvas.getHeight()/ 2,p)的;
}
}
这是失败的,因为不是所有的设备都支持任意的preVIEW大小。显然,有的做,但你不能依赖它。在您的surfaceChanged方法,你需要做的是这样的:
公共无效surfaceChanged(SurfaceHolder持有人,INT格式,INT W,INT高){
Camera.Parameters参数= camera.getParameters();
名单< Camera.Size> previewSizes = parameters.getSupported previewSizes();
//你需要选择最合适的previewSize您的应用程序
Camera.Size previewSize = // ...的previewSizes选择一个在这里
parameters.set previewSize(previewSize.width,previewSize.height);
camera.setParameters(参数);
camera.start preVIEW();
}
您将不得不想出一个办法来扩展这个,这样你就不会失去长宽比等。
有关参考这里是<一个href="http://developer.android.com/reference/android/hardware/Camera.Parameters.html#getSupported$p$pviewSizes%28%29">Android SDK文档。
I have included the camera functionality in my application. I have also launched the app in the market. I got an error message from one of the users that he is getting an error while opening the camera.
I have tested the app on the device on 2.1. The error I got from the user is using nexus one which will mostly run 2.2...Here's the logcat error that I've received...
java.lang.RuntimeException: setParameters failed
at android.hardware.Camera.native_setParameters(Native Method)
at android.hardware.Camera.setParameters(Camera.java:647)
at com.CameraApp.Preview.surfaceChanged(Preview.java:67)
at android.view.SurfaceView.updateWindow(SurfaceView.java:538)
at android.view.SurfaceView.dispatchDraw(SurfaceView.java:339)
at android.view.ViewGroup.drawChild(ViewGroup.java:1638)
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.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 android.view.ViewGroup.drawChild(ViewGroup.java:1640)
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.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1842)
at android.view.ViewRoot.draw(ViewRoot.java:1407)
at android.view.ViewRoot.performTraversals(ViewRoot.java:1163)
at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
I ran the app on 2.2 emulator also to check it. But it worked fine. Can anyone please tell me why the error is occurring?
Here is the class which I mentioned in the comments:
class Preview extends SurfaceView implements SurfaceHolder.Callback
{
private static final String TAG = "Preview";
SurfaceHolder mHolder;
public Camera camera;
Preview(Context context)
{
super(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);
}
public void surfaceCreated(SurfaceHolder holder)
{
// The Surface has been created, acquire the camera and tell it where
// to draw.
camera = Camera.open();
try {
camera.setPreviewDisplay(holder);
} catch (IOException exception) {
camera.release();
camera = null;
// TODO: add more exception handling logic here
}
}
public void surfaceDestroyed(SurfaceHolder holder)
{
// Surface will be destroyed when we return, so stop the preview.
// Because the CameraDevice object is not a shared resource, it's very
// important to release it when the activity is paused.
camera.stopPreview();
camera.release();
camera = null;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h)
{
// Now that the size is known, set up the camera parameters and begin
// the preview.
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewSize(w, h);
camera.setParameters(parameters);
camera.startPreview();
}
@Override
public void draw(Canvas canvas)
{
super.draw(canvas);
Paint p= new Paint(Color.RED);
Log.d(TAG,"draw");
canvas.drawText("PREVIEW", canvas.getWidth()/2, canvas.getHeight()/2, p );
}
}
It is failing because not all devices support arbitrary preview sizes. Apparently some do but you can't rely on it. In your surfaceChanged method you need to do something like this:
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
Camera.Parameters parameters = camera.getParameters();
List<Camera.Size> previewSizes = parameters.getSupportedPreviewSizes();
// You need to choose the most appropriate previewSize for your app
Camera.Size previewSize = // .... select one of previewSizes here
parameters.setPreviewSize(previewSize.width, previewSize.height);
camera.setParameters(parameters);
camera.startPreview();
}
You'll have to figure out a way to scale this so that you don't lose the aspect ratio etc.
For reference here is the Android SDK doc.
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