安卓相机preVIEW [英] android camera preview
本文介绍了安卓相机preVIEW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
我有一个问题。
我试图开发使用摄像头的程序，一切工作在我的设备，但像许多人都知道的相机preVIEW 不起作用一样方式在所有的设备，所以我试图整合code，谷歌提供了这个地址：
<一个href=\"http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/graphics/Camera$p$pview.html\" rel=\"nofollow\">http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/graphics/Camera$p$pview.html
我所面临的问题是，我不知道如何整合到我的项目，这里是我的code和我所不超过完成的：
preVIEW米preVIEW;
私人相机mCamera; @覆盖
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）; 米preVIEW =新的preVIEW（本）; //内容查看----------------------------------------------- -----------
的setContentView（R.layout.main）; mSurfaceView =（SurfaceView）findViewById（R.id.camera_surface）; 米preview.surfacemetod（mSurfaceView）; @覆盖
保护无效onResume（）{
// TODO自动生成方法存根
super.onResume（）; mCamera = Camera.open（）;
米preview.setCamera（mCamera）;
然后preVIEW类：
类preVIEW扩展的ViewGroup实现SurfaceHolder.Callback {
私人最终字符串标记=preVIEWSurfaceView mSurfaceView;
SurfaceHolder mHolder;
尺寸M previewSize;
清单＆LT;尺寸和GT; mSupported previewSizes;
相机mCamera;preVIEW（上下文的背景下）{
超级（上下文）; mSurfaceView =新SurfaceView（背景）;
addView（mSurfaceView）;}公共无效surfacemetod（SurfaceView面）{ // mSurfaceView =新SurfaceView（背景）;
// addView（mSurfaceView）; //安装SurfaceHolder.Callback所以我们得到通知时，
//创建下垫面和销毁。
mHolder = mSurfaceView.getHolder（）;
mHolder.addCallback（本）;
mHolder.setType（SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS）;}公共无效setCamera（相机摄像机）{
mCamera =摄像头;
如果（mCamera！= NULL）{
mSupported previewSizes = mCamera.getParameters（）getSupported previewSizes（）。
requestLayout（）;
}
}
在此code有在上面的链接中的所有方法我没有复制，以节省空间。
问题是，当我运行code对M previewSize.with和M previewSize.height
公共无效surfaceChanged（SurfaceHolder架，INT格式，诠释W，INT高）{
//现在，尺寸是已知的，设置相机参数，并开始
//将preVIEW。
Camera.Parameters参数= mCamera.getParameters（）;
parameters.set previewSize（M previewSize.width，男previewSize.height）;
requestLayout（）; mCamera.setParameters（参数）;
mCamera.start preVIEW（）;
}
是空的，我得到一个强制关闭
从本质上看起来并不里面OnMeasure得到解决。
任何想法？
这是日志：
02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：致命异常：主要02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：显示java.lang.NullPointerException02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在com.dashboard.camera.lite preview.surfaceChanged（preview.java：162）。02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.view.SurfaceView.updateWindow（SurfaceView.java:554）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.view.SurfaceView.dispatchDraw（SurfaceView.java:341）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.view.ViewGroup.drawChild（ViewGroup.java:1638）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.view.ViewGroup.dispatchDraw（ViewGroup.java:1367）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.view.ViewGroup.drawChild（ViewGroup.java:1638）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.view.ViewGroup.dispatchDraw（ViewGroup.java:1367）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.view.View.draw（View.java:6796）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.widget.FrameLayout.draw（FrameLayout.java:354）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.view.ViewGroup.drawChild（ViewGroup.java:1640）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.view.ViewGroup.dispatchDraw（ViewGroup.java:1367）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.view.View.draw（View.java:6796）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.widget.FrameLayout.draw（FrameLayout.java:354）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在com.android.internal.policy.impl.PhoneWindow $ DecorView.draw（PhoneWindow.java:1894）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.view.ViewRoot.draw（ViewRoot.java:1432）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.view.ViewRoot.performTraversals（ViewRoot.java:1174）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.view.ViewRoot.handleMessage（ViewRoot.java:1752）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.os.Handler.dispatchMessage（Handler.java:99）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.os.Looper.loop（Looper.java:123）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在android.app.ActivityThread.main（ActivityThread.java:4627）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在java.lang.reflect.Method.invokeNative（本机方法）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在java.lang.reflect.Method.invoke（Method.java:521）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:858）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:616）02-16 13：54：26.068：ERROR / AndroidRuntime（24374）：在dalvik.system.NativeStart.main（本机方法）
解决方案
您可以通过日志？
I $，你必须有m preview.width /高度问题P $ pdict - 这是propably一些不正确的值
I have a problem.
I'm trying to develop a program that uses the camera, everything is working in my device but like many of you know the CameraPreview doesn't work the same way in all devices, so I tried to integrate the code that google provides in this address:
The problem I've faced is that I don't know how to integrate to my project, here is my code and what I've done without exceeding:
Preview mPreview;
private Camera mCamera;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mPreview = new Preview(this);
//ContentView----------------------------------------------------------
setContentView(R.layout.main);
mSurfaceView = (SurfaceView)findViewById(R.id.camera_surface);
mPreview.surfacemetod(mSurfaceView);
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
mCamera = Camera.open();
mPreview.setCamera(mCamera);
Then the Preview class:
class Preview extends ViewGroup implements SurfaceHolder.Callback {
private final String TAG = "Preview";
SurfaceView mSurfaceView;
SurfaceHolder mHolder;
Size mPreviewSize;
List<Size> mSupportedPreviewSizes;
Camera mCamera;
Preview(Context context) {
super(context);
mSurfaceView = new SurfaceView(context);
addView(mSurfaceView);
}
public void surfacemetod(SurfaceView surface){
//mSurfaceView = new SurfaceView(context);
//addView(mSurfaceView);
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = mSurfaceView.getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void setCamera(Camera camera) {
mCamera = camera;
if (mCamera != null) {
mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
requestLayout();
}
}
After this code there are all the methods in the link above that I didn't copy to save space.
The question is that when I run the code the mPreviewSize.with and mPreviewSize.height
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 = mCamera.getParameters();
parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
requestLayout();
mCamera.setParameters(parameters);
mCamera.startPreview();
}
are null and I get a FORCE CLOSE
Essentially looks like it doesn't get inside OnMeasure to resolve them. Any idea?
This is the log:
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): FATAL EXCEPTION: main
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): java.lang.NullPointerException
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at com.dashboard.camera.lite.Preview.surfaceChanged(Preview.java:162)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.view.SurfaceView.updateWindow(SurfaceView.java:554)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.view.SurfaceView.dispatchDraw(SurfaceView.java:341)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.view.ViewGroup.drawChild(ViewGroup.java:1638)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.view.ViewGroup.drawChild(ViewGroup.java:1638)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.view.View.draw(View.java:6796)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.widget.FrameLayout.draw(FrameLayout.java:354)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.view.View.draw(View.java:6796)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.widget.FrameLayout.draw(FrameLayout.java:354)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1894)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.view.ViewRoot.draw(ViewRoot.java:1432)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.view.ViewRoot.performTraversals(ViewRoot.java:1174)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.view.ViewRoot.handleMessage(ViewRoot.java:1752)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.os.Handler.dispatchMessage(Handler.java:99)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.os.Looper.loop(Looper.java:123)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at android.app.ActivityThread.main(ActivityThread.java:4627)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at java.lang.reflect.Method.invokeNative(Native Method)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at java.lang.reflect.Method.invoke(Method.java:521)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
02-16 13:54:26.068: ERROR/AndroidRuntime(24374): at dalvik.system.NativeStart.main(Native Method)
解决方案
can you pass the log? I predict that you have a problem with mPreview.width/height - it is propably some incorrect value.
这篇关于安卓相机preVIEW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IT屋！
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