代码中使用了开源项目(OSChina 客户端2.0)的源码,zxing做二维码扫描识别。搬过来之后在Android 2.3机器运行报错:
Unexpected error initializing camera java.lang.RuntimeException: startPreview failed

startPreview失败报错详细如下:

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Unexpected error initializing camera
java.lang.RuntimeException: startPreview failed
at android.hardware.Camera.startPreview(Native Method)
at com.dtr.zxing.camera.CameraManager.startPreview(CameraManager.java:149)
at com.dtr.zxing.utils.CaptureActivityHandler.<init>(CaptureActivityHandler.java:57)
at com.dtr.zxing.activity.CaptureActivity.initCamera(CaptureActivity.java:285)
at com.dtr.zxing.activity.CaptureActivity.surfaceCreated(CaptureActivity.java:179)
at android.view.SurfaceView.updateWindow(SurfaceView.java:574)
at android.view.SurfaceView.updateWindow(SurfaceView.java:411)
at android.view.SurfaceView.dispatchDraw(SurfaceView.java:355)
at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
at android.view.View.draw(View.java:6883)
at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
at android.view.View.draw(View.java:6883)
at android.widget.FrameLayout.draw(FrameLayout.java:357)
at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
at android.view.View.draw(View.java:6883)
at android.support.v7.widget.ActionBarOverlayLayout.draw(ActionBarOverlayLayout.java:442)
at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
at android.view.View.draw(View.java:6883)
at android.widget.FrameLayout.draw(FrameLayout.java:357)
at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1921)
at android.view.ViewRoot.draw(ViewRoot.java:1526)
at android.view.ViewRoot.performTraversals(ViewRoot.java:1262)
at android.view.ViewRoot.handleMessage(ViewRoot.java:1863)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3687)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)
at dalvik.system.NativeStart.main(Native Method)

找到了一些文章,有的说Camera的open与startPreview不能多次调用,需要设置标记,查看OSChina的源码之后发现有标记,不是这个。

后来找到说低版本的SDK需要setType一下,设置成:SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS,尝试后依然没有解决问题。

最后是借鉴了这篇文章(不知道是不是原始链接)解决了问题,holderView要放在holder的allCallback前面,完整如下:

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@Override
protected void onResume() {
super.onResume();

// CameraManager must be initialized here, not in onCreate(). This is
// necessary because we don't
// want to open the camera driver and measure the screen size if we're
// going to show the help on
// first launch. That led to bugs where the scanning rectangle was the
// wrong size and partially
// off screen.
cameraManager = new CameraManager(getApplication());

handler = null;

if (isHasSurface) {
// The activity was paused but not stopped, so the surface still
// exists. Therefore
// surfaceCreated() won't be called, so init the camera here.
initCamera(scanPreview.getHolder());
} else {
// Install the callback and wait for surfaceCreated() to init the
// camera.

if (Build.VERSION.SDK_INT < 11)
scanPreview.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

scanPreview.getHolder().addCallback(this);
}

inactivityTimer.onResume();
}

就是这两句:

if(Build.VERSION.SDK_INT<11)
**
scanPreview.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);**

scanPreview.getHolder().addCallback(this);

OSChina客户端的2.0支持的最低版本是15,已经不再支持API10,不能PullRequest一下了。