我已经尝试了所有方法,但仍然无法解决此问题。
我正在应用中实现相机功能,除自动对焦外一切正常。当我调用 autoFocus() 时,它会引发异常,我不明白为什么。我在 Desire HD 上运行代码。
代码:
@Override
protected void onStart() {
super.onStart();
//grab seurface view and callback
cameraView = (CameraSurfaceView) findViewById(R.id.cameraView);
try{
camera = Camera.open();
cameraView.setCamera(camera);
//release previous autofocus and assign new one
camera.cancelAutoFocus();
camera.autoFocus(new Camera.AutoFocusCallback() {
public void onAutoFocus(boolean success, Camera camera) {
// TODO Auto-generated method stub
}});
}
catch (Exception e) {
//had an issue accessing the camera prompt user
//TODO create user prompt
e.printStackTrace();
}
}
堆栈跟踪:
01-11 16:09:38.456: W/System.err(26546): java.lang.RuntimeException: autoFocus failed
01-11 16:09:38.456: W/System.err(26546): at android.hardware.Camera.native_autoFocus(Native Method)
01-11 16:09:38.456: W/System.err(26546): at android.hardware.Camera.autoFocus(Camera.java:680)
01-11 16:09:38.456: W/System.err(26546): at com.myapp.MyActivity.onStart(BarcodeScannerActivity.java:57)
01-11 16:09:38.466: W/System.err(26546): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1201)
01-11 16:09:38.466: W/System.err(26546): at android.app.Activity.performStart(Activity.java:3955)
01-11 16:09:38.466: W/System.err(26546): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1845)
01-11 16:09:38.466: W/System.err(26546): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1893)
01-11 16:09:38.466: W/System.err(26546): at android.app.ActivityThread.access$1500(ActivityThread.java:135)
01-11 16:09:38.466: W/System.err(26546): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1054)
01-11 16:09:38.466: W/System.err(26546): at android.os.Handler.dispatchMessage(Handler.java:99)
01-11 16:09:38.466: W/System.err(26546): at android.os.Looper.loop(Looper.java:150)
01-11 16:09:38.476: W/System.err(26546): at android.app.ActivityThread.main(ActivityThread.java:4385)
01-11 16:09:38.476: W/System.err(26546): at java.lang.reflect.Method.invokeNative(Native Method)
01-11 16:09:38.476: W/System.err(26546): at java.lang.reflect.Method.invoke(Method.java:507)
01-11 16:09:38.476: W/System.err(26546): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849)
01-11 16:09:38.476: W/System.err(26546): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607)
01-11 16:09:38.476: W/System.err(26546): at dalvik.system.NativeStart.main(Native Method)
最佳答案
使用 SurfaceHolder.Callback -> surfaceCreated 了解何时可以启动 AutoFocus。如果未创建 Surfaceholder(持续一段时间),自动对焦将失败。
关于android - 自动对焦抛出异常,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8820702/