java.lang.RuntimeException: takePicture 失败 [英] java.lang.RuntimeException: takePicture failed
问题描述
当我连续单击捕获"按钮(没有任何中断)时，出现运行时异常我该如何解决这个问题?
when i do continuous click on Capture button (without any break), getting Runtime Exception how can i resolve this issue ?
如果不可能，我该如何处理这个异常?
if its not possible so how may i handle this Exception ?
btnCapture = (ImageButton) findViewById(R.id.btnCapture);
final MediaPlayer mp = MediaPlayer.create(CameraLauncherActivity.this, R.raw.button);
btnCapture.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// line where getting RuntimeException
camera.takePicture(null, null, mPicture);
}
});
日志:
02-12 14:48:41.580: E/AndroidRuntime(6997): FATAL EXCEPTION: main
02-12 14:48:41.580: E/AndroidRuntime(6997): java.lang.RuntimeException: takePicture failed
02-12 14:48:41.580: E/AndroidRuntime(6997): at android.hardware.Camera.native_takePicture(Native Method)
02-12 14:48:41.580: E/AndroidRuntime(6997): at android.hardware.Camera.takePicture(Camera.java:1126)
02-12 14:48:41.580: E/AndroidRuntime(6997): at android.hardware.Camera.takePicture(Camera.java:1071)
02-12 14:48:41.580: E/AndroidRuntime(6997): at app.cam.shane.CameraLauncherActivity$3.onClick(CameraLauncherActivity.java:116)
02-12 14:48:41.580: E/AndroidRuntime(6997): at android.view.View.performClick(View.java:4223)
02-12 14:48:41.580: E/AndroidRuntime(6997): at android.view.View$PerformClick.run(View.java:17275)
02-12 14:48:41.580: E/AndroidRuntime(6997): at android.os.Handler.handleCallback(Handler.java:615)
02-12 14:48:41.580: E/AndroidRuntime(6997): at android.os.Handler.dispatchMessage(Handler.java:92)
02-12 14:48:41.580: E/AndroidRuntime(6997): at android.os.Looper.loop(Looper.java:137)
02-12 14:48:41.580: E/AndroidRuntime(6997): at android.app.ActivityThread.main(ActivityThread.java:4921)
02-12 14:48:41.580: E/AndroidRuntime(6997): at java.lang.reflect.Method.invokeNative(Native Method)
02-12 14:48:41.580: E/AndroidRuntime(6997): at java.lang.reflect.Method.invoke(Method.java:511)
02-12 14:48:41.580: E/AndroidRuntime(6997): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1036)
02-12 14:48:41.580: E/AndroidRuntime(6997): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:803)
02-12 14:48:41.580: E/AndroidRuntime(6997): at dalvik.system.NativeStart.main(Native Method)
注意:-就像在布丁相机中一样，它们允许用户连续点击捕获按钮，但它们永远不会显示异常，如果您点击 50 次，它会捕获 10 个或更多图像，每个图像在特定时间后但未显示异常，就像我进入我的代码一样，以同样的方式我该如何处理这个异常?
Note:- Like in Pudding Camera, they allow user to do continuous tap on Capture button, but they will never show exception, if you do 50 clicks it will capture 10 or more images, each image after specific time but not showing exception, like i am getting in my code, in a same way how can i handle this exception ?
完整代码:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
preview=(SurfaceView)findViewById(R.id.surface);
previewHolder=preview.getHolder();
previewHolder.addCallback(surfaceCallback);
previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
btnCapture = (ImageButton) findViewById(R.id.btnCapture);
final MediaPlayer mp = MediaPlayer.create(CameraLauncherActivity.this, R.raw.button);
btnCapture.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mp.start();
camera.takePicture(null, null, mPicture);
}
});
@Override
public void onResume() {
super.onResume();
camera=Camera.open();
}
@Override
public void onPause() {
super.onPause();
if (inPreview) {
camera.stopPreview();
}
camera.release();
camera=null;
inPreview=false;
}
private Camera.Size getBestPreviewSize(int width, int height,
Camera.Parameters parameters) {
Camera.Size result=null;
for (Camera.Size size : parameters.getSupportedPreviewSizes()) {
if (size.width <= width && size.height <= height) {
if (result == null) {
result=size;
}
else {
int resultArea=result.width * result.height;
int newArea=size.width * size.height;
if (newArea > resultArea) {
result=size;
}
}
}
}
return(result);
}
private Camera.Size getSmallestPictureSize(Camera.Parameters parameters) {
Camera.Size result=null;
for (Camera.Size size : parameters.getSupportedPictureSizes()) {
if (result == null) {
result=size;
}
else {
int resultArea=result.width * result.height;
int newArea=size.width * size.height;
if (newArea < resultArea) {
result=size;
}
}
}
return(result);
}
SurfaceHolder.Callback surfaceCallback=new SurfaceHolder.Callback(){
public void surfaceCreated(SurfaceHolder holder) {
try {
camera.setPreviewDisplay(previewHolder);
} catch (Throwable t) {
Log.e("PreviewDemo-surfaceCallback",
"Exception in setPreviewDisplay()", t);
Toast.makeText(CameraLauncherActivity.this, t.getMessage(), Toast.LENGTH_LONG).show();
}
}
public void surfaceChanged(SurfaceHolder holder,int format, int width,int height) {
params = camera.getParameters();
params.setFlashMode(Camera.Parameters.FLASH_MODE_ON);
Camera.Size size = getBestPreviewSize(width, height, params);
Camera.Size pictureSize=getSmallestPictureSize(params);
if (size != null && pictureSize != null) {
params.setPreviewSize(size.width, size.height);
params.setPictureSize(pictureSize.width,
pictureSize.height);
camera.setParameters(params);
camera.startPreview();
inPreview=true;
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
}
};
PictureCallback mPicture = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
pictureFile = getOutputMediaFile();
camera.startPreview();
if (pictureFile == null) {
return;
}
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
} catch (FileNotFoundException e) {
} catch (IOException e) {
}
}
};
static File getOutputMediaFile() {
/* yyyy-MM-dd'T'HH:mm:ss.SSSZ */
timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
// file name
mediaFile = new File(LoginActivity.mediaStorageDir.getPath() + File.separator
+ "IMG_" + timeStamp + ".jpg");
return mediaFile;
}
}
推荐答案
首先，在 onPictureTaken 中捕获异常，保留空的捕获部分不是一个好习惯.然后，我将添加一个标志，以防止在保存上一张图片时调用 takePicture().稍后在您的按钮 onClick 中，您将检查是否可以调用 takePicture().
Firstly, catch your exceptions in onPictureTaken, leaving empty catch sections is not a good practice. Then, I would add a flag that would prevent from calling takePicture() while previous picture is being saved. Later in your button onClick you would check if it's ok to call takePicture().
将标志声明为您的活动的成员:
Declare a flag as a member of your Activity:
private boolean safeToTakePicture = false;
在surfaceChanged()中，只需在调用startPreview()后将标志设置为true即可:
In surfaceChanged(), just set the flag to true after calling startPreview():
camera.startPreview();
safeToTakePicture = true;
在您的 onClick() 侦听器中检查标志并拍照(如果可以):
In your onClick() listener check the flag and take picture if ok to do so:
if (safeToTakePicture) {
mp.start();
camera.takePicture(null, null, mPicture);
safeToTakePicture = false;
}
在onPictureTaken()中，在保存图片后再次将标志设置为true(并添加异常打印):
In onPictureTaken(), set the flag again to true after picture has been saved (and add exception printing):
PictureCallback mPicture = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
pictureFile = getOutputMediaFile();
camera.startPreview();
if (pictureFile == null) {
//no path to picture, return
safeToTakePicture = true;
return;
}
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace(); //<-------- show exception
} catch (IOException e) {
e.printStackTrace(); //<-------- show exception
}
//finished saving picture
safeToTakePicture = true;
}
};
注意:正如文档所说，必须先开始预览才能拍照."，因此可能的增强功能是使用 setPreviewCallback() 注册将在预览数据可用时调用的回调，以及调用 onPreviewFrame 时将标志设置为 true.
NOTES: As the docs say, "Preview must be started before you can take a picture.", so possible enhancement would be to use setPreviewCallback() to register callback that will be called when preview data is available, and set the flag to true when onPreviewFrame is called.
这篇关于java.lang.RuntimeException: takePicture 失败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！
