我一直在尝试为Android制作相机应用程序，但是当我尝试拍照时，它会出现问题，我必须强制关闭。
LogCat是：
07-14 12:41:25.195: D/dalvikvm(13549): GC_EXPLICIT freed 51K, 49% free 2694K/5187K, external 3474K/4422K, paused 26ms
07-14 12:41:25.195: D/AndroidRuntime(13549): Shutting down VM
07-14 12:41:25.195: W/dalvikvm(13549): threadid=1: thread exiting with uncaught exception (group=0x4001e560)
07-14 12:41:25.226: E/AndroidRuntime(13549): FATAL EXCEPTION: main
07-14 12:41:25.226: E/AndroidRuntime(13549): java.lang.RuntimeException: takePicture failed
07-14 12:41:25.226: E/AndroidRuntime(13549): at android.hardware.Camera.native_takePicture(Native Method)
07-14 12:41:25.226: E/AndroidRuntime(13549): at android.hardware.Camera.takePicture(Camera.java:829)
07-14 12:41:25.226: E/AndroidRuntime(13549): at android.hardware.Camera.takePicture(Camera.java:793)
07-14 12:41:25.226: E/AndroidRuntime(13549): at com.mvitsor.camerax.cameraMainActivity.takepic(cameraMainActivity.java:53)
07-14 12:41:25.226: E/AndroidRuntime(13549): at com.mvitsor.camerax.cameraMainActivity$5.onClick(cameraMainActivity.java:44)
07-14 12:41:25.226: E/AndroidRuntime(13549): at android.view.View.performClick(View.java:2485)
07-14 12:41:25.226: E/AndroidRuntime(13549): at android.view.View$PerformClick.run(View.java:9089)
07-14 12:41:25.226: E/AndroidRuntime(13549): at android.os.Handler.handleCallback(Handler.java:587)
07-14 12:41:25.226: E/AndroidRuntime(13549): at android.os.Handler.dispatchMessage(Handler.java:92)
07-14 12:41:25.226: E/AndroidRuntime(13549): at android.os.Looper.loop(Looper.java:130)
07-14 12:41:25.226: E/AndroidRuntime(13549): at android.app.ActivityThread.main(ActivityThread.java:3859)
07-14 12:41:25.226: E/AndroidRuntime(13549): at java.lang.reflect.Method.invokeNative(Native Method)
07-14 12:41:25.226: E/AndroidRuntime(13549): at java.lang.reflect.Method.invoke(Method.java:507)
07-14 12:41:25.226: E/AndroidRuntime(13549): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:840)
07-14 12:41:25.226: E/AndroidRuntime(13549): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:598)
07-14 12:41:25.226: E/AndroidRuntime(13549): at dalvik.system.NativeStart.main(Native Method)
以下是代码：
package com.mvitsor.camerax;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.ImageButton;
import android.widget.Toast;
public class cameraMainActivity extends Activity {
/** Called when the activity is first created. */
Camera camera;
SurfaceView preview;
SurfaceHolder previewHolder;
ImageButton takePic;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
setContentView(R.layout.main_camera_layout);
preview = (SurfaceView) findViewById(R.id.SVpreview);
previewHolder = preview.getHolder();
previewHolder.addCallback(surfaceCallback);
previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
takePic = (ImageButton) findViewById(R.id.btn_take_pic);
takePic.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
takepic();
}
});
}
public void takepic(){
camera.stopPreview();
System.gc();
camera.takePicture(null, null, photoCallback);
//camera.takePicture(ShutterCallback, rawCallback, photoCallback);
}
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);
}
SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
try {
camera.setPreviewDisplay(previewHolder);
} catch (Throwable t) {
Toast toast = Toast.makeText(cameraMainActivity.this,
"Exception in setPreviewDisplay", Toast.LENGTH_LONG);
toast.show();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
Camera.Parameters parameters = camera.getParameters();
Camera.Size bestSize = getBestPreviewSize(width, height, parameters);
parameters.setPreviewSize(bestSize.width, bestSize.height);
parameters.setPictureFormat(PixelFormat.JPEG);
camera.setParameters(parameters);
camera.startPreview();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
camera.release();
camera = null;
}
};
/*
Camera.ShutterCallback ShutterCallback = new Camera.ShutterCallback() {
public void onShutter() {
}
};
PictureCallback rawCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
}
};
*/
Camera.PictureCallback photoCallback = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
// Save the image JPEG data to the SD card
FileOutputStream outStream = null;
try {
outStream = new FileOutputStream("/sdcard/test.jpg");
outStream.write(data);
outStream.close();
} catch (FileNotFoundException e) {
Log.d("CAMERA", e.getMessage());
} catch (IOException e) {
Log.d("CAMERA", e.getMessage());
}
camera.startPreview();
/*new SavePhotoTask().execute(data);
camera.startPreview();*/
}
};
}
我已经尝试了camera.takePicture(null, null, photoCallback);和camera.takePicture(ShutterCallback, rawCallback, photoCallback);，正如您所看到的那样，我也读过System.gc();可以工作的地方，但事实并非如此。
另外，我读到一个常见的问题是在拍完照片后忘记重新开始预览，但我之后正在调用camera.startPreview();，所以我真的不知道发生了什么！
我正在运行Android 2.3.3（Motorola Razr）。 （看起来很多人在Android 2.3.3上遇到摄像头问题......）。
如果有人可以提供帮助我真的很感激！
Vitor Martes Sternlicht
我已将整个项目上传到http://www.4shared.com/rar/meSWrQPm/CameraTest.html
我下载了一个显示此日志的应用程序...也许这里有些东西可以提供帮助：它看起来像创建文件目录时出现的问题。我该如何解决这个问题？
07-15 12:43:36.578 27203 27487 W ActivityManager: Force finishing activity com.mvitsor.camerax/.cameraMainActivity
07-15 12:43:36.601 27203 27221 W ApplicationContext: Unable to create files directory
这是完整的日志
07-15 13:09:08.226 27203 27582 W ActivityManager: Force finishing activity com.mvitsor.camerax/.cameraMainActivity
07-15 12:43:36.601 27203 27221 W ApplicationContext: Unable to create files directory
07-15 13:09:08.414 27203 27221 I ActivityManager: Config changed: { scale=1.0 imsi=724/10 loc=pt_BR touch=3 keys=1/1/2 nav=1/1 orien=1 layout=268435490 uiMode=17 seq=139}
07-15 13:09:08.726 27203 27219 W ActivityManager: Activity pause timeout for HistoryRecord{40562350 com.mvitsor.camerax/.cameraMainActivity}
07-15 13:09:09.132 27203 27219 I ActivityManager: No longer want android.process.media (pid 11091): hidden #21
07-15 13:09:09.515 27203 27488 I WindowManager: WIN DEATH: Window{40d859a8 com.mvitsor.camerax/com.mvitsor.camerax.cameraMainActivity paused=false}
07-15 13:09:09.515 27203 27499 I ActivityManager: Process com.mvitsor.camerax (pid 11848) has died.
07-15 13:09:09.515 27203 27426 I WindowManager: WIN DEATH: Window{40ef8c70 SurfaceView paused=false}
07-15 13:09:09.539 27203 27210 I MotOverlay: disable_streaming_locked
07-15 13:09:09.539 27203 27210 I MotOverlay: Destroying overlay/fd=300/obj=4650c000
07-15 13:09:09.539 27498 24620 D IMirrorIpc: onTransact (2)
07-15 13:09:09.539 27498 24620 D MirrorIpc: unregisterCallback: client 0
07-15 13:09:09.539 27498 24620 D MirrorUCMgrIpcCB: ipcInit - Client already exists
07-15 13:09:09.539 27498 24620 D MirrorEngine: hdmiMirrorActiveOverlay/0
07-15 13:09:09.539 27174 11890 D OverlayDisplayAdapter: hardware/ti/omap4/omap3/camera-omap4/src/OverlayDisplayAdapter.cpp:714 processHalMsg - Display thread received DISPLAY_EXIT command from Camera HAL.
07-15 13:09:09.539 27174 11890 D OverlayDisplayAdapter: hardware/ti/omap4/omap3/camera-omap4/src/OverlayDisplayAdapter.cpp:715 processHalMsg - Stopping display thread...
07-15 13:09:09.539 27174 11890 D OverlayDisplayAdapter: hardware/ti/omap4/omap3/camera-omap4/src/OverlayDisplayAdapter.cpp:735 processHalMsg - +Signalling display semaphore
07-15 13:09:09.539 27174 11890 D OverlayDisplayAdapter: hardware/ti/omap4/omap3/camera-omap4/src/OverlayDisplayAdapter.cpp:740 processHalMsg - -Signalling display semaphore
07-15 13:09:09.539 27174 27672 E CameraHal: hardware/ti/omap4/omap3/camera-omap4/src/AppCallbackNotifier.cpp:1517 stop - AppCallbackNotifier already in stopped state
07-15 13:09:09.539 27174 11876 D CameraHal: hardware/ti/omap4/omap3/camera-omap4/src/AppCallbackNotifier.cpp:161 notificationThread - Notification Thread received message from Camera HAL
07-15 13:09:09.539 27174 11876 D CameraHal: hardware/ti/omap4/omap3/camera-omap4/src/AppCallbackNotifier.cpp:848 processMessage - +Msg get...
07-15 13:09:09.539 27174 11876 D CameraHal: hardware/ti/omap4/omap3/camera-omap4/src/AppCallbackNotifier.cpp:850 processMessage - -Msg get...
07-15 13:09:09.539 27174 11876 D CameraHal: hardware/ti/omap4/omap3/camera-omap4/src/AppCallbackNotifier.cpp:869 processMessage - Received NOTIFIER_EXIT command from Camera HAL
07-15 13:09:09.539 27174 11876 D CameraHal: hardware/ti/omap4/omap3/camera-omap4/src/AppCallbackNotifier.cpp:880 processMessage - +Signalling semaphore from CameraHAL..
07-15 13:09:09.539 27174 11876 D CameraHal: hardware/ti/omap4/omap3/camera-omap4/src/AppCallbackNotifier.cpp:883 processMessage - -Signalling semaphore from CameraHAL..
07-15 13:09:09.539 27174 11876 D CameraHal: hardware/ti/omap4/omap3/camera-omap4/src/AppCallbackNotifier.cpp:165 notificationThread - Notification Thread exiting.
07-15 13:09:09.539 27174 11876 D CameraHal: hardware/ti/omap4/omap3/camera-omap4/src/AppCallbackNotifier.cpp:190 notificationThread - Notification Thread exited.
07-15 13:09:09.539 27174 27672 D CameraHal: hardware/ti/omap4/omap3/camera-omap4/src/AppCallbackNotifier.cpp:938 ~AppCallbackNotifier - Stopping Event Provider
07-15 13:09:09.539 27174 27672 D CameraHal: hardware/ti/omap4/omap3/camera-omap4/src/AppCallbackNotifier.cpp:946 ~AppCallbackNotifier - Stopping Frame Provider
07-15 13:09:09.539 27174 27672 D CameraHal: hardware/ti/omap4/omap3/camera-omap4/src/BaseCameraAdapter.cpp:476 sendCommand - Set time out
07-15 13:09:09.539 27174 27672 D OMXCameraAdapter:
07-15 13:09:09.539 27174 27672 D OMXCameraAdapter:
07-15 13:09:09.539 27174 27672 D OMXCameraAdapter: **** ~OMXCameraAdapter called() ! ****
07-15 13:09:09.539 27174 27672 D OMXCameraAdapter:
07-15 13:09:09.585 27174 27672 E DOMX_RPC: Closing IPC
07-15 13:09:09.585 27174 11875 D OMXCameraAdapter: hardware/ti/omap4/omap3/camera-omap4/src/OMXCameraAdapter/OMXCameraAdapter.cpp:9462 Handler - msg.command = -1
07-15 13:09:09.585 27174 11875 E OMXCameraAdapter: hardware/ti/omap4/omap3/camera-omap4/src/OMXCameraAdapter/OMXCameraAdapter.cpp:9476 Handler - Exiting command handler
07-15 13:09:09.585 27174 27672 D OMXCameraAdapter:
07-15 13:09:09.585 27174 27672 D OMXCameraAdapter:
07-15 13:09:09.585 27174 27672 D OMXCameraAdapter: **** ~OMXCameraAdapter exiting ! ****
07-15 13:09:09.585 27174 27672 D OMXCameraAdapter:
07-15 13:09:09.601 27174 27672 D CameraHal:
07-15 13:09:09.601 27174 27672 D CameraHal:
07-15 13:09:09.601 27174 27672 D CameraHal: **** ~CameraHal() ****
07-15 13:09:09.601 27174 27672 D CameraHal:
07-15 13:09:09.601 27174 27672 D CameraHal:
07-15 13:09:11.523 27203 27552 I ActivityManager: Starting: Intent { act=android.intent.action.MAIN flg=0x10500000 cmp=de.softxperience.android.nedebug/.LogcatActivity } from pid 27542
答案 0 :(得分：3)
尝试添加以下权限，因为捕获时不允许存储图像...
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
答案 1 :(得分：0)
您确定要求拍照（并使用任何相机功能）的许可
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />