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POApps Crash when I change the orientation
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2013-04-26T05:36:08.963
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Actually I am new on android and I am making a small android app for me to capture a photo and upload it to a web server, I've found some example code to do it. The problem is that it works great on both landscape or portrait when I start the apps, but if I change the orientation from landscape to portrait or from portrait to landscape, it crashed. Here is the log by Eclipse: <pre><code>04-26 13:04:36.380: I/dalvikvm(887): threadid=3: reacting to signal 3 04-26 13:04:36.510: I/dalvikvm(887): Wrote stack traces to '/data/anr/traces.txt' 04-26 13:04:36.880: I/dalvikvm(887): threadid=3: reacting to signal 3 04-26 13:04:36.890: I/dalvikvm(887): Wrote stack traces to '/data/anr/traces.txt' 04-26 13:04:37.180: D/gralloc_goldfish(887): Emulator without GPU emulation detected. 04-26 13:04:37.390: I/dalvikvm(887): threadid=3: reacting to signal 3 04-26 13:04:37.530: I/dalvikvm(887): Wrote stack traces to '/data/anr/traces.txt' 04-26 13:07:26.370: D/HEE(887): /mnt/sdcard/neosoft/ocr/photo/IMG_20130426_130726.jpg 04-26 13:07:27.840: D/dalvikvm(887): GC_FOR_ALLOC freed 128K, 3% free 9168K/9415K, paused 404ms 04-26 13:07:44.929: D/AndroidRuntime(887): Shutting down VM 04-26 13:07:44.929: W/dalvikvm(887): threadid=1: thread exiting with uncaught exception (group=0x409c01f8) 04-26 13:07:44.990: E/AndroidRuntime(887): FATAL EXCEPTION: main 04-26 13:07:44.990: E/AndroidRuntime(887): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.atakephoto1/com.example.atakephoto1.Photo1Activity}: java.lang.NullPointerException 04-26 13:07:44.990: E/AndroidRuntime(887): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 04-26 13:07:44.990: E/AndroidRuntime(887): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 04-26 13:07:44.990: E/AndroidRuntime(887): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3351) 04-26 13:07:44.990: E/AndroidRuntime(887): at android.app.ActivityThread.access$700(ActivityThread.java:123) 04-26 13:07:44.990: E/AndroidRuntime(887): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1151) 04-26 13:07:44.990: E/AndroidRuntime(887): at android.os.Handler.dispatchMessage(Handler.java:99) 04-26 13:07:44.990: E/AndroidRuntime(887): at android.os.Looper.loop(Looper.java:137) 04-26 13:07:44.990: E/AndroidRuntime(887): at android.app.ActivityThread.main(ActivityThread.java:4424) 04-26 13:07:44.990: E/AndroidRuntime(887): at java.lang.reflect.Method.invokeNative(Native Method) 04-26 13:07:44.990: E/AndroidRuntime(887): at java.lang.reflect.Method.invoke(Method.java:511) 04-26 13:07:44.990: E/AndroidRuntime(887): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 04-26 13:07:44.990: E/AndroidRuntime(887): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 04-26 13:07:44.990: E/AndroidRuntime(887): at dalvik.system.NativeStart.main(Native Method) 04-26 13:07:44.990: E/AndroidRuntime(887): Caused by: java.lang.NullPointerException 04-26 13:07:44.990: E/AndroidRuntime(887): at com.example.atakephoto1.Photo1Activity.onCreate(Photo1Activity.java:139) 04-26 13:07:44.990: E/AndroidRuntime(887): at android.app.Activity.performCreate(Activity.java:4465) 04-26 13:07:44.990: E/AndroidRuntime(887): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 04-26 13:07:44.990: E/AndroidRuntime(887): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 04-26 13:07:44.990: E/AndroidRuntime(887): ... 12 more 04-26 13:07:45.751: I/dalvikvm(887): threadid=3: reacting to signal 3 04-26 13:07:45.760: I/dalvikvm(887): Wrote stack traces to '/data/anr/traces.txt' </code></pre> Here is my java code: <pre><code>package com.example.atakephoto1; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.net.HttpURLConnection; import java.net.URL; import java.text.SimpleDateFormat; import java.util.Date; import java.util.List; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.os.Environment; import android.app.Activity; import android.app.AlertDialog; import android.app.ProgressDialog; import android.content.Context; import android.content.DialogInterface; import android.content.pm.PackageManager; import android.content.res.Configuration; import android.graphics.ImageFormat; import android.hardware.Camera; import android.hardware.Camera.AutoFocusCallback; import android.hardware.Camera.Parameters; import android.hardware.Camera.PictureCallback; import android.hardware.Camera.Size; import android.util.Log; import android.view.Menu; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.view.Window; import android.view.WindowManager; import android.widget.Button; import android.widget.FrameLayout; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; public class Photo1Activity extends Activity { //private AutoFocusCallback myAutoFocusCallback = null; public static String image_file_path; public static String php_upload_url; public static String photoPath; String TAG="tag"; private Camera mCamera; private CameraPreview mPreview; public static final int MEDIA_TYPE_IMAGE = 1; public static final int MEDIA_TYPE_VIDEO = 2; SQLiteDatabase db; public String db_name = "config"; public String table_name = "config"; NewListDataSQL helper = new NewListDataSQL(Photo1Activity.this, db_name); AutoFocusCallback myAutoFocusCallback = new AutoFocusCallback() { public void onAutoFocus(boolean success, Camera camera) { } }; public static boolean exists(String URLName){ try { HttpURLConnection.setFollowRedirects(false); HttpURLConnection con = (HttpURLConnection) new URL(URLName).openConnection(); con.setRequestMethod("HEAD"); return (con.getResponseCode() == HttpURLConnection.HTTP_OK); } catch (Exception e) { e.printStackTrace(); return false; } } protected void alertbox(String title, String mymessage) { new AlertDialog.Builder(this) .setMessage(mymessage) .setTitle(title) .setCancelable(true) .setNeutralButton(android.R.string.cancel, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton){} }) .show(); } public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // some work that needs to be done on orientation change } @Override public void onCreate(Bundle savedInstanceState) { requestWindowFeature(Window.FEATURE_NO_TITLE); this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN); super.onCreate(savedInstanceState); setContentView(R.layout.activity_photo1); db = helper.getReadableDatabase(); Cursor cursor = db.rawQuery("select value from config where name='image_save_path'", null); int rows_num = cursor.getCount(); if(rows_num != 0) { cursor.moveToFirst(); for(int i=0; i<rows_num; i++) { String strCr = cursor.getString(0); photoPath = strCr; cursor.moveToNext(); } } cursor.close(); Cursor cursor_php = db.rawQuery("select value from config where name='php_upload_url'", null); int rows_num_php = cursor_php.getCount(); if(rows_num_php != 0) { cursor_php.moveToFirst(); for(int i=0; i<rows_num_php; i++) { String strCr = cursor_php.getString(0); php_upload_url = strCr; cursor_php.moveToNext(); } } cursor_php.close(); // Create an instance of Camera mCamera = getCameraInstance(); //final Camera.Parameters parameters = mCamera.getParameters(); Parameters parameters = mCamera.getParameters(); List<Size> sizes = parameters.getSupportedPictureSizes(); Camera.Size size = sizes.get(0); for(int i=0;i<sizes.size();i++) { if(sizes.get(i).width > size.width) size = sizes.get(i); } parameters.setPictureSize(size.width, size.height); parameters.setPictureFormat(ImageFormat.JPEG); parameters.setFlashMode(Parameters.FLASH_MODE_AUTO); parameters.setFocusMode(Parameters.FOCUS_MODE_CONTINUOUS_PICTURE); parameters.setSceneMode(Parameters.SCENE_MODE_AUTO); parameters.setWhiteBalance(Parameters.WHITE_BALANCE_AUTO); parameters.setExposureCompensation(0); parameters.setPictureFormat(ImageFormat.JPEG); parameters.setJpegQuality(100); List<String> focusModes = parameters.getSupportedFocusModes(); if (focusModes.contains(Parameters.FOCUS_MODE_AUTO)){ parameters.setFocusMode(Parameters.FOCUS_MODE_AUTO); } mCamera.setParameters(parameters); // Create our Preview view and set it as the content of our activity. mPreview = new CameraPreview(this, mCamera); FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview); preview.addView(mPreview); final FrameLayout frame01 = (FrameLayout) findViewById(R.id.camera_preview); frame01.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { mCamera.autoFocus(myAutoFocusCallback); } }); // Add a listener to the Capture button final Button captureButton = (Button) findViewById(R.id.button_capture); captureButton.setOnClickListener( new View.OnClickListener() { public void onClick(View v) { // get an image from the camera captureButton.setEnabled(false); mCamera.autoFocus(myAutoFocusCallback); mCamera.takePicture(null, null, mPicture); } } ); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_photo1, menu); return true; } private boolean checkCameraHardware(Context context) { if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){ // this device has a camera return true; } else { // no camera on this device return false; } } /** A safe way to get an instance of the Camera object. */ public static Camera getCameraInstance(){ Camera c = null; try { c = Camera.open(); // attempt to get a Camera instance } catch (Exception e){ // Camera is not available (in use or does not exist) } return c; // returns null if camera is unavailable } /** A basic Camera preview class */ public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback { private SurfaceHolder mHolder; private Camera mCamera; public CameraPreview(Context context, Camera camera) { super(context); mCamera = camera; // Install a SurfaceHolder.Callback so we get notified when the // underlying surface is created and destroyed. mHolder = getHolder(); mHolder.addCallback(this); // deprecated setting, but required on Android versions prior to 3.0 mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } public void surfaceCreated(SurfaceHolder holder) { // The Surface has been created, now tell the camera where to draw the preview. } public void surfaceDestroyed(SurfaceHolder holder) { // empty. Take care of releasing the Camera preview in your activity. } public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { // If your preview can change or rotate, take care of those events here. // Make sure to stop the preview before resizing or reformatting it. if (mHolder.getSurface() == null){ // preview surface does not exist return; } // stop preview before making changes try { mCamera.stopPreview(); } catch (Exception e){ // ignore: tried to stop a non-existent preview } // set preview size and make any resize, rotate or // reformatting changes here // start preview with new settings try { mCamera.setPreviewDisplay(mHolder); mCamera.startPreview(); } catch (Exception e){ Log.d(TAG, "Error starting camera preview: " + e.getMessage()); } } } private PictureCallback mPicture = new PictureCallback() { public void onPictureTaken(byte[] data, Camera camera) { File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE); if (pictureFile == null){ Log.d(TAG, "Error creating media file, check storage permissions: "); //e.getMessage()); return; } try { FileOutputStream fos = new FileOutputStream(pictureFile); fos.write(data); fos.close(); image_file_path = pictureFile.getPath(); Log.d("HEE",pictureFile.getPath()); FileUploadTask fileuploadtask = new FileUploadTask(); fileuploadtask.execute(); mCamera.startPreview(); final Button captureButton = (Button) findViewById(R.id.button_capture); captureButton.setEnabled(true); } catch (FileNotFoundException e) { Log.d(TAG, "File not found: " + e.getMessage()); } catch (IOException e) { Log.d(TAG, "Error accessing file: " + e.getMessage()); } } }; /** Create a file Uri for saving an image or video */ private static Uri getOutputMediaFileUri(int type){ return Uri.fromFile(getOutputMediaFile(type)); } /** Create a File for saving an image or video */ private static File getOutputMediaFile(int type){ // To be safe, you should check that the SDCard is mounted // using Environment.getExternalStorageState() before doing this. String filepath = Environment.getExternalStorageDirectory().getPath(); File mediaStorageDir = new File(filepath, photoPath ); if(!mediaStorageDir.exists()){ Log.d("HERE",photoPath ); try { mediaStorageDir.mkdirs(); Log.d("HERE","after"); } catch (Exception e) { Log.d("HERE",e.getMessage().toString()); } } // Create a media file name String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); File mediaFile; if (type == MEDIA_TYPE_IMAGE){ mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_"+ timeStamp + ".jpg"); } else if(type == MEDIA_TYPE_VIDEO) { mediaFile = new File(mediaStorageDir.getPath() + File.separator + "VID_"+ timeStamp + ".mp4"); } else { return null; } return mediaFile; } class FileUploadTask extends AsyncTask<Object, Integer, Void> { private ProgressDialog dialog = null; HttpURLConnection connection = null; DataOutputStream outputStream = null; DataInputStream inputStream = null; String pathToOurFile = image_file_path; String urlServer = php_upload_url; String lineEnd = "\r\n"; String twoHyphens = "--"; String boundary = "*****"; File uploadFile = new File(pathToOurFile); long totalSize = uploadFile.length(); // Get size of file, bytes @Override protected void onPreExecute() { dialog = new ProgressDialog(Photo1Activity.this); dialog.setMessage("Uploading..."); dialog.setIndeterminate(false); dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); dialog.setProgress(0); dialog.show(); } @Override protected Void doInBackground(Object... arg0) { long length = 0; int progress; int bytesRead, bytesAvailable, bufferSize; byte[] buffer; int maxBufferSize = 256 * 1024; try { FileInputStream fileInputStream = new FileInputStream(new File(pathToOurFile)); URL url = new URL(urlServer); connection = (HttpURLConnection) url.openConnection(); // Set size of every block for post connection.setChunkedStreamingMode(256 * 1024);// 256KB // Allow Inputs & Outputs connection.setDoInput(true); connection.setDoOutput(true); connection.setUseCaches(false); // Enable POST method connection.setRequestMethod("POST"); connection.setRequestProperty("Connection", "Keep-Alive"); connection.setRequestProperty("Charset", "UTF-8"); connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary); outputStream = new DataOutputStream( connection.getOutputStream()); outputStream.writeBytes(twoHyphens + boundary + lineEnd); outputStream .writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + pathToOurFile + "\"" + lineEnd); outputStream.writeBytes(lineEnd); bytesAvailable = fileInputStream.available(); bufferSize = Math.min(bytesAvailable, maxBufferSize); buffer = new byte[bufferSize]; // Read file bytesRead = fileInputStream.read(buffer, 0, bufferSize); while (bytesRead > 0) { outputStream.write(buffer, 0, bufferSize); length += bufferSize; progress = (int) ((length * 100) / totalSize); publishProgress(progress); bytesAvailable = fileInputStream.available(); bufferSize = Math.min(bytesAvailable, maxBufferSize); bytesRead = fileInputStream.read(buffer, 0, bufferSize); } outputStream.writeBytes(lineEnd); outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd); publishProgress(100); // Responses from the server (code and message) // int serverResponseCode = connection.getResponseCode(); // String serverResponseMessage = connection.getResponseMessage(); fileInputStream.close(); outputStream.flush(); outputStream.close(); } catch (Exception ex) { } return null; } @Override protected void onProgressUpdate(Integer... progress) { dialog.setProgress(progress[0]); } @Override protected void onPostExecute(Void result) { try { dialog.dismiss(); // TODO Auto-generated method stub } catch (Exception e) { } } } } </code></pre>
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Apps Crash when I change the orientation
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