我正在编写一个应用程序，它每 x 秒拍照，检测高于阈值的差异，并最终通过电子邮件发送高清图片。如果我将所有相机功能与主功能放在同一个类中，该应用程序运行良好，但随后代码变得混乱，并且在线程中拍照也变得更加棘手。因此，我决定将所有相机功能移到第二个 java 类 (TakePic.java) 中，并每隔 x 秒从主类调用一次。目前，如果我至少可以调用一次就可以了，但我不能。这是我的代码：
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest android:versionCode="1"
android:versionName="1.0"
package="com.lyo.android.CameraSender5"
xmlns:android="http://schemas.android.com/apk/res/android">
<uses-sdk android:minSdkVersion="5"
android:targetSdkVersion="6" />
<supports-screens android:largeScreens="false"
android:normalScreens="true"
android:smallScreens="false" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.RECEIVE_SMS" />
<uses-feature android:name="android.hardware.RECEIVE_MMS" />
<uses-feature android:name="android.hardware.read_owner_data" />
<uses-feature android:name="android.hardware.write_owner_data" />
<uses-feature android:name="android.hardware.acccess_network_state" />
<application
android:icon="@drawable/cw"
android:label="@string/app_name">
<activity
android:configChanges="keyboardHidden|orientation"
android:label="@string/app_name"
android:name=".PreviewDemo"
android:screenOrientation="landscape"
android:theme="@android:style/Theme.NoTitleBar.Fullscreen">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:configChanges="keyboardHidden|orientation"
android:label="@string/app_name"
android:name=".TakePic"
android:screenOrientation="landscape"
android:theme="@android:style/Theme.NoTitleBar.Fullscreen">
<intent-filter>
<action android:name="com.lyo.android.TAKEPIC" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
以下是主类：
package com.lyo.android.CameraSender5;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import javax.mail.BodyPart;
import javax.mail.Multipart;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
//import android.hardware.Camera;
//import android.hardware.Camera.PictureCallback;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
//import android.view.SurfaceHolder;
//import android.view.SurfaceView;
import android.widget.TextView;
import android.widget.Toast;
import com.lyo.android.CameraSender5.R;
public class PreviewDemo extends Activity
{
//private SurfaceView preview=null;
//private SurfaceHolder previewHolder=null;
//private Camera camera=null;
private boolean inPreview=false;
private boolean cameraConfigured=false;
public static Integer fileNameINT = 1;
/*START*/
public static final int MEDIA_TYPE_IMAGE = 1;
public Bitmap bitmapPictureOld;
public Bitmap bitmapPictureNew;
public int singlePixelNew;
public int singlePixelOld;
public int colorREDsum = 0;
public int firstLoop = 1;
public int tollerance = 500000; //Devi ridurre la tolleranza fino a che c'e' una image detection
@Override
public void onCreate(Bundle savedInstanceState)
{
Log.e("onCreate", "onCreate started");
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.e("onCreate", "ContentView set");
//TakePic TakePic = new TakePic();
Log.e("onCreate", "TakePic called");
//TakePic.initialize(this);
Log.e("onCreate", "Initialized");
startActivity(new Intent("com.lyo.android.TAKEPIC"));
//try
//{
// Thread.sleep(1000);
//}
//catch (InterruptedException e)
//{
// // TODO Auto-generated catch block
// e.printStackTrace();
//}
//colorREDsum = 0;
try
{
Thread.sleep(3000);
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
//this.runOnUiThread(Timer_Tick);
//camera.takePicture(null, null, mPicture);
}};
这是 TakePic.java 类，我在其中输入了所有相机功能（这些曾经在主类中，并且工作正常）：
package com.lyo.android.CameraSender5;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import javax.mail.BodyPart;
import javax.mail.Multipart;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.PreviewCallback;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.TextView;
import android.widget.Toast;
import com.lyo.android.CameraSender5.R;
public class TakePic extends Activity
{
public SurfaceView preview=null;
public SurfaceHolder previewHolder=null;
public Camera camera=null;
public boolean inPreview=false;
public boolean cameraConfigured=false;
public static Integer fileNameINT = 1;
/*START*/
public static final int MEDIA_TYPE_IMAGE = 1;
public Bitmap bitmapPictureOld;
public Bitmap bitmapPictureNew;
public int singlePixelNew;
public int singlePixelOld;
public int colorREDsum = 0;
public int firstLoop = 1;
public int tollerance = 500000; //Devi ridurre la tolleranza fino a che c'e' una image detection
//@Override
public void surfaceDestroyed(SurfaceHolder holder) {
if (camera != null) {
camera.stopPreview();
camera.setPreviewCallback(null);
camera.release();
camera = null;
}
}
//@Override
public void surfaceCreated(SurfaceHolder holder) {
if (camera == null) {
camera = Camera.open();
try {
camera.setPreviewDisplay(holder);
// TODO test how much setPreviewCallbackWithBuffer is faster
camera.setPreviewCallback((PreviewCallback) this);
} catch (IOException e) {
camera.release();
camera = null;
}
}
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
//setContentView(R.layout.main);
if (camera != null) {
Log.e("LYO TakePic onResume", "CAMERA NOT NULL");
camera.unlock();
camera.stopPreview();
camera.unlock();
camera.setPreviewCallback(null);
camera.unlock();
camera.release();
camera.unlock();
camera = null;
}
else
{
Log.e("LYO TakePic onResume", "CAMERA NULL");
}
Log.e("LYO TakePic onResume", "onResume Start");
camera = Camera.open();
Log.e("LYO TakePic onResume", "Camera opened");
camera.startPreview();
startPreview();
Log.e("LYO TakePic onResume", "Preview Started");
colorREDsum = 0;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
Log.e("LYO TakePic onCreate", "Setting content view");
setContentView(R.layout.main);
Log.e("LYO TakePic onCreate", "Content View Set");
Log.e("LYO TakePic onCreate", "Initialization started");
preview=(SurfaceView)this.findViewById(R.id.preview);
Log.e("LYO TakePic onCreate", "preview set");
previewHolder=preview.getHolder();
previewHolder.addCallback(surfaceCallback);
previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
Log.e("LYO TakePic onCreate", "holder set");
colorREDsum = 0;
}
private PictureCallback mPicture = new PictureCallback()
{
//@Override
public void onPictureTaken(byte[] data, Camera camera)
{
Log.e("PICTURE TAKEN", "START");
colorREDsum = 0;
if (firstLoop == 1)
{
Log.e("PICTURE TAKEN", "1st LOOP");
bitmapPictureNew = BitmapFactory.decodeByteArray(data, 0, data.length);
firstLoop = 0;
}
else
{
Log.e("PICTURE TAKEN", "OTHER LOOP");
bitmapPictureOld = Bitmap.createBitmap(bitmapPictureNew);
//bitmapPictureOld.createBitmap(bitmapPictureNew, 0, 0, bitmapPictureNew.getWidth(), bitmapPictureNew.getHeight());
//Bitmap bitmapPictureOld = bitmapPictureNew;
bitmapPictureNew = BitmapFactory.decodeByteArray(data, 0, data.length);
colorREDsum = 0;
int counter = 0;
for (int height = 0; height <= bitmapPictureNew.getHeight() - 1; height++)
{
for (int width = 0; width <= bitmapPictureNew.getWidth() - 1; width++)
{
singlePixelNew = bitmapPictureNew.getPixel(width, height);
singlePixelOld = bitmapPictureOld.getPixel(width, height);
colorREDsum = colorREDsum + (Color.red(singlePixelNew) - Color.red(singlePixelOld));
counter = counter +1;
}
}
TextView tv1 = (TextView) findViewById(R.id.integer1);
tv1.setText(String.valueOf(colorREDsum));
try
{
Thread.sleep(500);
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
if(colorREDsum > tollerance)
{
//send message
Log.e("PICTURE TAKEN", "RED > TOLLERANCE");
//TEMP
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
bitmapPictureOld.compress(Bitmap.CompressFormat.PNG, 100, bytes);
//you can create a new file name "test.jpg" in sdcard folder.
File f = new File(Environment.getExternalStorageDirectory() + File.separator + "ALARM.png");
try
{
f.createNewFile();
//write the bytes in file
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
fo.close();
}
catch (IOException e1)
{
// TODO Auto-generated catch block
e1.printStackTrace();
}
//camera.startPreview();
Log.e("PICTURE TAKEN", "START MAILING");
Mail m = new Mail("*****@.com", "*****");
String[] toArr = {"*****@hotmail.com"};
m.setTo(toArr);
m.setFrom("*****@gmail.com");
m.setSubject("Ciao Ciao");
m.setBody("You never know... :)");
try
{
Log.e("PICTURE TAKEN", "START SEND TRY");
tv1.setText("Start Sending");
//try
//{
// Log.e("PICTURE TAKEN", "SLEEP 500");
// Thread.sleep(500);
//}
//catch (InterruptedException e)
//{
// // TODO Auto-generated catch block
// e.printStackTrace();
//}
//START SEND
MimeMessage msg = new MimeMessage(m.sessionFCN());
msg.setFrom(new InternetAddress("*****@gmail.com")); //_from
msg.setRecipients(MimeMessage.RecipientType.TO, "*****@hotmail.com"); //addressTo
msg.setSubject("Ciao Ciao");
msg.setSentDate(new Date());
// setup message body
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText("You never know... :)"); //_body
Multipart _multipart;
_multipart = new MimeMultipart();
_multipart.addBodyPart(messageBodyPart);
// Put parts in message
try
{
msg.setContent(_multipart);
}
catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
// send email
try
{
Transport.send(msg);
}
catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
Log.e("PICTURE TAKEN", "ERROR WITH Transport.send(msg)");
}
//END SEND
//m.send();
}
catch (Exception e)
{
tv1.setText("Sending Failed");
}
//try
//{
// Thread.sleep(500);
//}
//catch (InterruptedException e)
//{
// // TODO Auto-generated catch block
// e.printStackTrace();
//}
}
//camera.startPreview();
}
}
};
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 void initPreview(int width, int height)
{
if (camera!=null && previewHolder.getSurface()!=null)
{
try
{
camera.setPreviewDisplay(previewHolder);
}
catch (Throwable t)
{
Log.e("PreviewDemo-surfaceCallback", "Exception in setPreviewDisplay()", t);
//Toast.makeText(PreviewDemo.this, t.getMessage(), Toast.LENGTH_LONG).show();
}
if (!cameraConfigured)
{
Camera.Parameters parameters=camera.getParameters();
Camera.Size size=getBestPreviewSize(width, height, parameters);
if (size!=null)
{
parameters.setPreviewSize(size.width, size.height);
camera.setParameters(parameters);
cameraConfigured=true;
}
}
}
}
private void startPreview()
{
if (cameraConfigured && camera!=null)
{
camera.startPreview();
inPreview=true;
}
}
SurfaceHolder.Callback surfaceCallback=new SurfaceHolder.Callback()
{
public void surfaceCreated(SurfaceHolder holder)
{
// no-op -- wait until surfaceChanged()
}
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
{
initPreview(width, height);
startPreview();
}
public void surfaceDestroyed(SurfaceHolder holder)
{
// no-op
}
};
public void initialize(Context c)
{
//Log.e("initialize", "Setting content view");
//setContentView(R.layout.main);
//Log.e("initialize", "Content View Set");
//Log.e("initialize", "Initialization started");
//preview=(SurfaceView)this.findViewById(R.id.preview);
//Log.e("initialize", "preview set");
//previewHolder=preview.getHolder();
//previewHolder.addCallback(surfaceCallback);
//previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
//Log.e("initialize", "holder set");
//colorREDsum = 0;
}
}
为了完整起见，我还发布了我用来发送电子邮件的课程：
package com.lyo.android.CameraSender5;
import java.util.Date;
import java.util.Properties;
import javax.activation.CommandMap;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.activation.MailcapCommandMap;
import javax.mail.BodyPart;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;
public class Mail extends javax.mail.Authenticator
{
private String _user;
private String _pass;
private String[] _to;
private String _from;
private String _port;
private String _sport;
private String _host;
private String _subject;
private String _body;
private boolean _auth;
private boolean _debuggable;
private Multipart _multipart;
public Mail()
{
_host = "smtp.gmail.com"; // default smtp server
_port = "465"; // default smtp port
_sport = "465"; // default socketfactory port
_user = "*****@gmail.com"; // username
_pass = "*****"; // password
_from = "*****@gmail.com"; // email sent from
_subject = "Ciao Ciao"; // email subject
_body = "You never know... :)"; // email body
_debuggable = false; // debug mode on or off - default off
_auth = true; // smtp authentication - default on
_multipart = new MimeMultipart();
// There is something wrong with MailCap, javamail can not find a handler for the multipart/mixed part, so this bit needs to be added.
MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap();
mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");
mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml");
mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");
mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");
CommandMap.setDefaultCommandMap(mc);
}
public Mail(String user, String pass) {
this();
_user = user;
_pass = pass;
}
//mie
public Session sessionFCN()
{
Properties props = _setProperties();
Session session;
try {
Log.e("SESSION","TRYING Session.getInstance");
session = Session.getInstance(props, new GMailAuthenticator("*****@gmail.com", "*****"));
return session;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.e("SESSION","ERROR WITH Session.getInstance");
}
//DUMMY
session = Session.getInstance(props, new GMailAuthenticator("*****@gmail.com", "*****"));
return session;
}
class GMailAuthenticator extends Authenticator {
String user;
String pw;
public GMailAuthenticator (String username, String password)
{
super();
this.user = username;
this.pw = password;
}
public PasswordAuthentication getPasswordAuthentication()
{
return new PasswordAuthentication(user, pw);
}
}
//stop mie
public boolean send() throws Exception {
Properties props = _setProperties();
if(!"*****@gmail.com".equals("") && !"*****".equals("") && _to.length > 0 && !"*****@gmail.com".equals("") && !"Ciao Ciao".equals("") && !"You never know... :)".equals(""))
{
Session session = Session.getInstance(props, this);
MimeMessage msg = new MimeMessage(session);
msg.setFrom(new InternetAddress("*****@gmail.com")); //_from
InternetAddress[] addressTo = new InternetAddress[_to.length];
for (int i = 0; i < _to.length; i++)
{
addressTo[i] = new InternetAddress(_to[i]);
}
msg.setRecipients(MimeMessage.RecipientType.TO, addressTo);
msg.setSubject("Ciao Ciao");
msg.setSentDate(new Date());
//
// setup message body
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText("You never know... :)"); //_body
_multipart.addBodyPart(messageBodyPart);
// Put parts in message
msg.setContent(_multipart);
// send email
Transport.send(msg);
return true;
}
else
{
return false;
}
}
//You can call this method at any time if you want to add an attachment, but make sure you call it before the send method.
public void addAttachment(String filename) throws Exception
{
BodyPart messageBodyPart = new MimeBodyPart();
DataSource source = new FileDataSource(filename);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(filename);
_multipart.addBodyPart(messageBodyPart);
}
@Override
public PasswordAuthentication getPasswordAuthentication()
{
return new PasswordAuthentication(_user, _pass);
}
public Properties _setProperties() //private
{
Properties props = new Properties();
props.put("mail.smtp.host", _host);
if(_debuggable)
{
props.put("mail.debug", "true");
}
if(_auth)
{
props.put("mail.smtp.auth", "true");
}
props.put("mail.smtp.port", _port);
props.put("mail.smtp.socketFactory.port", _sport);
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.socketFactory.fallback", "false");
return props;
}
// the getters and setters
public String getBody()
{
return _body;
}
public void setBody(String _body)
{
this._body = _body;
}
// more of the getters and setters …..
public void setTo(String[] toArr)
{
this._to = toArr;
}
public void setFrom(String string)
{
this._from = string;
}
public void setSubject(String string)
{
this._subject = string;
}
};
感谢 Log.e 消息，我发现错误发生在 camera = Camera.open(); 以下是我从 Eclipse 获得的 LogCat：
08-03 22:00:24.135: E/onCreate(1817): onCreate started
08-03 22:00:24.205: E/onCreate(1817): ContentView set
08-03 22:00:24.215: E/onCreate(1817): TakePic called
08-03 22:00:24.215: E/onCreate(1817): Initialized
08-03 22:00:27.295: E/LYO TakePic onCreate(1817): Setting content view
08-03 22:00:27.305: E/LYO TakePic onCreate(1817): Content View Set
08-03 22:00:27.305: E/LYO TakePic onCreate(1817): Initialization started
08-03 22:00:27.305: E/LYO TakePic onCreate(1817): preview set
08-03 22:00:27.305: E/LYO TakePic onCreate(1817): holder set
08-03 22:00:27.305: E/LYO TakePic onResume(1817): CAMERA NULL
08-03 22:00:27.305: E/LYO TakePic onResume(1817): onResume Start
08-03 22:00:27.325: E/AndroidRuntime(1817): FATAL EXCEPTION: main
08-03 22:00:27.325: E/AndroidRuntime(1817): java.lang.RuntimeException: Unable to resume activity {com.lyo.android.CameraSender5/com.lyo.android.CameraSender5.TakePic}: java.lang.RuntimeException: Fail to connect to camera service
08-03 22:00:27.325: E/AndroidRuntime(1817): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3128)
08-03 22:00:27.325: E/AndroidRuntime(1817): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3143)
08-03 22:00:27.325: E/AndroidRuntime(1817): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2684)
08-03 22:00:27.325: E/AndroidRuntime(1817): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
08-03 22:00:27.325: E/AndroidRuntime(1817): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
08-03 22:00:27.325: E/AndroidRuntime(1817): at android.os.Handler.dispatchMessage(Handler.java:99)
08-03 22:00:27.325: E/AndroidRuntime(1817): at android.os.Looper.loop(Looper.java:123)
08-03 22:00:27.325: E/AndroidRuntime(1817): at android.app.ActivityThread.main(ActivityThread.java:4627)
08-03 22:00:27.325: E/AndroidRuntime(1817): at java.lang.reflect.Method.invokeNative(Native Method)
08-03 22:00:27.325: E/AndroidRuntime(1817): at java.lang.reflect.Method.invoke(Method.java:521)
08-03 22:00:27.325: E/AndroidRuntime(1817): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-03 22:00:27.325: E/AndroidRuntime(1817): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-03 22:00:27.325: E/AndroidRuntime(1817): at dalvik.system.NativeStart.main(Native Method)
08-03 22:00:27.325: E/AndroidRuntime(1817): Caused by: java.lang.RuntimeException: Fail to connect to camera service
08-03 22:00:27.325: E/AndroidRuntime(1817): at android.hardware.Camera.native_setup(Native Method)
08-03 22:00:27.325: E/AndroidRuntime(1817): at android.hardware.Camera.<init>(Camera.java:110)
08-03 22:00:27.325: E/AndroidRuntime(1817): at android.hardware.Camera.open(Camera.java:90)
08-03 22:00:27.325: E/AndroidRuntime(1817): at com.lyo.android.CameraSender5.TakePic.onResume(TakePic.java:107)
08-03 22:00:27.325: E/AndroidRuntime(1817): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1149)
08-03 22:00:27.325: E/AndroidRuntime(1817): at android.app.Activity.performResume(Activity.java:3823)
08-03 22:00:27.325: E/AndroidRuntime(1817): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3118)
08-03 22:00:27.325: E/AndroidRuntime(1817): ... 12 more
正如你所看到的，我试图在调用它之前释放/解锁相机，只是为了确保它没有被使用，但我仍然得到同样的错误......我做错了什么？
预先感谢您的帮助！