个人中心
gpt4 book ai didi

android - onCreate() 中附加项的空值

转载 作者：太空狗 更新时间：2023-10-29 16:39:31 24 4
gpt4 key购买 nike

  1. 使用 JSON 将数据提取到列表中，并允许用户选择列表项并使用在列表上单击的项目准备文件夹名称，例如:事件 + 名称_日期

    举个例子:- 本田汽车_A-05-12-2013

  2. 现在我显示相机和 2 个按钮，即:- 查看图库和捕获图像

  3. 允许用户捕捉，并在 CaptureImages 目录中创建一个文件夹，名称为:Honda Motors Event_A-05-12-2013

  4. 现在，一旦用户点击“查看图库”按钮，就会显示本田汽车 Event_A-05-12-2013 中可用的图像列表，在图库 Activity 中，我还提供返回按钮以返回并捕获更多图像，但是这里我遇到了问题

  5. 每当用户返回并拍摄图像时，不要将这些图像放入 Honda Motors Event_A-05-12-2013 文件夹，而是将其保存在另一个文件夹中，文件夹名称如:null Event_null-05-12-2013

CameraLauncherActivity.java:-

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_camera);
            
            mCamera = getCameraInstance();
        
            mCameraPreview = new PreviewSurface(this, mCamera);
            FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
            preview.addView(mCameraPreview);
            
            
            Bundle extras = getIntent().getExtras();
            if (extras != null) {
                String value = extras.getString("folder_name");
                Log.d(CameraLauncherActivity.LOG_TAG, "folder_name :: " + value);    
            }


            Button captureButton = (Button) findViewById(R.id.btnCapture);
            Log.d(CameraLauncherActivity.LOG_TAG, "captureButton :: " + captureButton);
            captureButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    mCamera.takePicture(null, null, mPicture);
                    Log.d(CameraLauncherActivity.LOG_TAG, "mCamera.takePicture :: " + mCamera);                                         
                }
            });
            
            Button viewButton = (Button) findViewById(R.id.btnView);
            Log.d(CameraLauncherActivity.LOG_TAG, "SingleAngelActivityButton :: " + viewButton);
            viewButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {             
                  
                    Intent intentNewEvent = new Intent(CameraLauncherActivity.this, UploadActivity.class);
                    String event_id = customFolder;
                    intentNewEvent.putExtra("event_id", event_id);
                    startActivity(intentNewEvent);        
                }
            });
            
            cd = new ConnectionDetector(getApplicationContext());
             
            // Check if Internet present
            if (!cd.isConnectingToInternet()) {
                // Internet Connection is not present
                alert.showAlertDialog(CameraLauncherActivity.this, "Internet Connection Error",
                        "Please connect to working Internet connection", false);
                // stop executing code by return
                return;
            }
        
        // Get event id, angel id
        Intent i = getIntent();
        event_id = i.getStringExtra("event_id");
        angel_id = i.getStringExtra("angel_id");
        
        // calling background thread
        new LoadSingleTrack().execute();
    }
    
    
    
    /**
     * Background Async Task to get single angel information
     * */
    class LoadSingleTrack extends AsyncTask<String, String, String> {

        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(CameraLauncherActivity.this);
            pDialog.setMessage("Initializing Camera...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);
            pDialog.show();
        }

        /**
         * getting angel json and parsing
         * */
        protected String doInBackground(String... args) {
            // Building Parameters
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            
            // post event id, angel id as GET parameters
            params.add(new BasicNameValuePair("event", event_id));
            params.add(new BasicNameValuePair("angel", angel_id));

            // getting JSON string from URL
            String json = jsonParser.makeHttpRequest(URL_angel, "GET",
                    params);

            // Check your log cat for JSON reponse
            Log.d("Single Track JSON: ", json);

            try {
                JSONObject jObj = new JSONObject(json);
                if(jObj != null){
                    angel_name = jObj.getString(TAG_ANGEL);
                    event_name = jObj.getString(TAG_EVENT);
                }           

            } catch (JSONException e) {
                e.printStackTrace();
            }

            return null;
        }

        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(String file_url) {
            // dismiss the dialog after getting angel information
            pDialog.dismiss();
            
            // updating UI from Background Thread
            runOnUiThread(new Runnable() {
                public void run() {
                    
                    TextView txt_angel_name = (TextView) findViewById(R.id.angel_title);
                    String timeStamp = new SimpleDateFormat("dd-MM-yyyy").format(new Date());
                
                    txt_angel_name.setText(event_name + " Event_"+ angel_name + "-" + timeStamp);
                    customFolder = txt_angel_name.getText().toString();
                    Log.d(CameraLauncherActivity.LOG_TAG, "customFolder :: " + customFolder);
                    
                                 // Change Activity Title with angel title
                    setTitle(angel_name);
                    
                    // folder name
                    mediaStorageDir = new File(
                            Environment
                                    .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
                                    "/CaptureImages/"+ customFolder + "/");
                    
                    if (!mediaStorageDir.exists()) {
                        if (!mediaStorageDir.mkdirs()) {
                            Log.d("App", "failed to create directory");                  
                        }
                    }                   
                }
            });
        }
    }
    
    /**
     * Helper method to access the camera returns null if it cannot get the
     * camera or does not exist
     * 
     * @return
     */
    private Camera getCameraInstance() {
        
        Camera camera = null;
        Log.d(CameraLauncherActivity.LOG_TAG, "getCameraInstance()Camera:: " + camera);
        try {
            camera = Camera.open(0);
            Log.d(CameraLauncherActivity.LOG_TAG, "getCameraInstance()open:: " + camera);
        } catch (Exception e) {
            // cannot get camera or does not exist
        }
        return camera;
    }

    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(mediaStorageDir.getPath() + File.separator
                + "IMG_" + timeStamp + ".jpg");
       
        return mediaFile;
    }

上传.java:-

@Override
        public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);       
         
        setContentView(R.layout.activity_upload);
        
         // Permission StrictMode
        if (android.os.Build.VERSION.SDK_INT > 9) 
        {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }       
        TextView textHeading = (TextView) findViewById(R.id.txtEventNameDate);
        textHeading.setText(CameraLauncherActivity.customFolder);
        
        final Button button = (Button) findViewById(R.id.buttonBack);
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on click
                Intent i = new Intent(getApplicationContext(), CameraLauncherActivity.class);
                i.putExtra("folder_name", CameraLauncherActivity.customFolder);
                startActivity(i);
            }
        });

         
        /*** Get Images from SDCard ***/
        ImageList = getSD();
         
        // ListView and imageAdapter
        lstView = (ListView) findViewById(R.id.listView1);
        lstView.setAdapter(new ImageAdapter(this));
         
        }
         
         
        private List <String> getSD()
        {
        List <String> it = new ArrayList <String>();
        String string = "/mnt/sdcard/Pictures/CaptureImages/";
        File f = new File (string+ CameraLauncherActivity.customFolder+ "/");
        File[] files = f.listFiles ();
         
        for (int i = 0; i <files.length; i++)
        {
        File  file = files[i];
        Log.d("Count",file.getPath());
        it.add (file.getPath());
        }
        return it;
      }
   }

日志:-

12-05 00:12:54.091: I/Choreographer(2284): Skipped 76 frames!  The application may be doing too much work on its main thread.
12-05 00:13:08.520: D/CameraLauncherActivity(2284): getCameraInstance()Camera:: null
12-05 00:13:09.380: D/CameraLauncherActivity(2284): getCameraInstance()open:: android.hardware.Camera@41777870
12-05 00:13:09.380: D/CameraLauncherActivity(2284): folder_name :: Honda Motors Event_Angel A-05-12-2013
12-05 00:13:09.390: D/CameraLauncherActivity(2284): captureButton :: android.widget.Button{419fe4d8 VFED..C. ......I. 0,0-0,0 #7f090004 app:id/btnCapture}
12-05 00:13:09.390: D/CameraLauncherActivity(2284): SingleAngelActivityButton :: android.widget.Button{419b2678 VFED..C. ......I. 0,0-0,0 #7f090002 app:id/btnView}
12-05 00:13:09.790: I/Choreographer(2284): Skipped 36 frames!  The application may be doing too much work on its main thread.
12-05 00:13:10.490: I/Choreographer(2284): Skipped 169 frames!  The application may be doing too much work on its main thread.
12-05 00:13:13.170: W/System.err(2284): org.json.JSONException: End of input at character 0 of 
12-05 00:13:14.580: I/Choreographer(2284): Skipped 112 frames!  The application may be doing too much work on its main thread.
12-05 00:13:14.660: W/System.err(2284):     at org.json.JSONTokener.syntaxError(JSONTokener.java:450)
12-05 00:13:15.070: W/System.err(2284):     at org.json.JSONTokener.nextValue(JSONTokener.java:97)
12-05 00:13:15.070: W/System.err(2284):     at org.json.JSONObject.<init>(JSONObject.java:154)
12-05 00:13:15.070: W/System.err(2284):     at org.json.JSONObject.<init>(JSONObject.java:171)
12-05 00:13:15.150: W/System.err(2284):     at com.example.camera.CameraLauncherActivity$LoadSingleTrack.doInBackground(CameraLauncherActivity.java:195)
12-05 00:13:15.280: W/System.err(2284):     at com.example.camera.CameraLauncherActivity$LoadSingleTrack.doInBackground(CameraLauncherActivity.java:1)
12-05 00:13:15.400: W/System.err(2284):     at android.os.AsyncTask$2.call(AsyncTask.java:287)
12-05 00:13:15.540: W/System.err(2284):     at java.util.concurrent.FutureTask.run(FutureTask.java:234)
12-05 00:13:15.690: W/System.err(2284):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
12-05 00:13:15.690: W/System.err(2284):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
12-05 00:13:15.690: W/System.err(2284):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
12-05 00:13:15.730: I/Choreographer(2284): Skipped 41 frames!  The application may be doing too much work on its main thread.
12-05 00:13:15.980: I/Choreographer(2284): Skipped 64 frames!  The application may be doing too much work on its main thread.
12-05 00:13:16.181: W/System.err(2284):     at java.lang.Thread.run(Thread.java:841)
12-05 00:13:16.290: I/Choreographer(2284): Skipped 72 frames!  The application may be doing too much work on its main thread.
12-05 00:13:16.560: I/Choreographer(2284): Skipped 68 frames!  The application may be doing too much work on its main thread.
12-05 00:13:21.020: D/CameraLauncherActivity(2284): mCamera.takePicture :: android.hardware.Camera@41777870
12-05 00:13:24.110: D/Count(2284): /mnt/sdcard/Pictures/CaptureImages/null Event_null-05-12-2013/IMG_20131205_001321.jpg
12-05 00:13:25.480: D/dalvikvm(2284): GC_FOR_ALLOC freed 147K, 3% free 10392K/10656K, paused 426ms, total 464ms
12-05 00:13:26.340: I/Choreographer(2284): Skipped 493 frames!  The application may be doing too much work on its main thread.

将日志添加到自定义文件夹后:-

 12-05 01:32:53.360: I/Choreographer(8354): Skipped 79 frames!  The application may be doing too much work on its main thread.
12-05 01:32:53.661: D/CameraLauncherActivity(8354): customFolder :: Honda Motors Event_Angel A-05-12-2013
12-05 01:32:53.830: I/Choreographer(8354): Skipped 124 frames!  The application may be doing too much work on its main thread.
12-05 01:33:01.250: D/CameraLauncherActivity(8354): mCamera.takePicture :: android.hardware.Camera@416f4c90
12-05 01:33:06.540: D/CameraLauncherActivity(8354): mCamera.takePicture :: android.hardware.Camera@416f4c90
12-05 01:33:09.360: D/Count(8354): /mnt/sdcard/Pictures/CaptureImages/Honda Motors Event_Angel A-05-12-2013/IMG_20131205_001237.jpg
12-05 01:33:09.360: D/Count(8354): /mnt/sdcard/Pictures/CaptureImages/Honda Motors Event_Angel A-05-12-2013/IMG_20131205_001239.jpg
12-05 01:33:09.389: D/Count(8354): /mnt/sdcard/Pictures/CaptureImages/Honda Motors Event_Angel A-05-12-2013/IMG_20131205_001240.jpg
12-05 01:33:09.389: D/Count(8354): /mnt/sdcard/Pictures/CaptureImages/Honda Motors Event_Angel A-05-12-2013/IMG_20131205_001242.jpg
12-05 01:33:09.389: D/Count(8354): /mnt/sdcard/Pictures/CaptureImages/Honda Motors Event_Angel A-05-12-2013/IMG_20131205_013302.jpg
12-05 01:33:09.389: D/Count(8354): /mnt/sdcard/Pictures/CaptureImages/Honda Motors Event_Angel A-05-12-2013/IMG_20131205_013306.jpg
12-05 01:33:09.680: I/Choreographer(8354): Skipped 32 frames!  The application may be doing too much work on its main thread.
12-05 01:33:12.000: D/dalvikvm(8354): GC_FOR_ALLOC freed 224K, 7% free 5431K/5780K, paused 488ms, total 516ms
12-05 01:33:12.161: I/dalvikvm-heap(8354): Grow heap (frag case) to 6.587MB for 1228816-byte allocation
12-05 01:33:12.560: D/dalvikvm(8354): GC_FOR_ALLOC freed 2K, 6% free 6629K/6984K, paused 398ms, total 398ms
12-05 01:33:14.320: D/dalvikvm(8354): GC_FOR_ALLOC freed 57K, 6% free 6621K/6984K, paused 165ms, total 199ms
12-05 01:33:14.340: I/dalvikvm-heap(8354): Grow heap (frag case) to 7.750MB for 1228816-byte allocation
12-05 01:33:14.501: D/dalvikvm(8354): GC_FOR_ALLOC freed <1K, 5% free 7821K/8188K, paused 140ms, total 140ms
12-05 01:33:16.050: D/dalvikvm(8354): GC_FOR_ALLOC freed 68K, 4% free 9048K/9392K, paused 161ms, total 162ms
12-05 01:33:17.270: D/dalvikvm(8354): GC_FOR_ALLOC freed 34K, 4% free 10261K/10596K, paused 227ms, total 280ms
12-05 01:33:17.960: D/dalvikvm(8354): GC_FOR_ALLOC freed 34K, 3% free 11474K/11800K, paused 132ms, total 137ms
12-05 01:33:18.550: I/Choreographer(8354): Skipped 2287 frames!  The application may be doing too much work on its main thread.
12-05 01:33:22.031: I/Choreographer(8354): Skipped 81 frames!  The application may be doing too much work on its main thread.
12-05 01:50:03.100: D/CameraLauncherActivity(8354): getCameraInstance()Camera:: null
12-05 01:50:03.980: D/CameraLauncherActivity(8354): getCameraInstance()open:: android.hardware.Camera@41968f50
12-05 01:50:03.980: D/CameraLauncherActivity(8354): folder_name :: Honda Motors Event_Angel A-05-12-2013
12-05 01:50:03.980: D/CameraLauncherActivity(8354): captureButton :: android.widget.Button{41999820 VFED..C. ......I. 0,0-0,0 #7f090004 app:id/btnCapture}
12-05 01:50:03.980: D/CameraLauncherActivity(8354): SingleAngelActivityButton :: android.widget.Button{41999298 VFED..C. ......I. 0,0-0,0 #7f090002 app:id/btnView}
12-05 01:50:04.801: I/Choreographer(8354): Skipped 124 frames!  The application may be doing too much work on its main thread.
12-05 01:50:07.900: I/Choreographer(8354): Skipped 134 frames!  The application may be doing too much work on its main thread.
12-05 01:50:08.961: I/Choreographer(8354): Skipped 38 frames!  The application may be doing too much work on its main thread.
12-05 01:50:09.252: I/Choreographer(8354): Skipped 41 frames!  The application may be doing too much work on its main thread.
12-05 01:50:09.501: I/Choreographer(8354): Skipped 61 frames!  The application may be doing too much work on its main thread.
12-05 01:50:09.721: W/System.err(8354): org.json.JSONException: End of input at character 0 of 
12-05 01:50:09.780: I/Choreographer(8354): Skipped 69 frames!  The application may be doing too much work on its main thread.
12-05 01:50:10.080: I/Choreographer(8354): Skipped 74 frames!  The application may be doing too much work on its main thread.
12-05 01:50:10.500: I/Choreographer(8354): Skipped 110 frames!  The application may be doing too much work on its main thread.
12-05 01:50:10.771: I/Choreographer(8354): Skipped 66 frames!  The application may be doing too much work on its main thread.
12-05 01:50:11.061: I/Choreographer(8354): Skipped 73 frames!  The application may be doing too much work on its main thread.
12-05 01:50:11.361: I/Choreographer(8354): Skipped 75 frames!  The application may be doing too much work on its main thread.
12-05 01:50:11.550: W/System.err(8354):     at org.json.JSONTokener.syntaxError(JSONTokener.java:450)
12-05 01:50:11.550: W/System.err(8354):     at org.json.JSONTokener.nextValue(JSONTokener.java:97)
12-05 01:50:11.580: I/Choreographer(8354): Skipped 55 frames!  The application may be doing too much work on its main thread.
12-05 01:50:11.590: W/System.err(8354):     at org.json.JSONObject.<init>(JSONObject.java:154)
12-05 01:50:11.870: I/Choreographer(8354): Skipped 72 frames!  The application may be doing too much work on its main thread.
12-05 01:50:12.091: W/System.err(8354):     at org.json.JSONObject.<init>(JSONObject.java:171)
12-05 01:50:12.091: W/System.err(8354):     at com.example.camera.CameraLauncherActivity$LoadSingleTrack.doInBackground(CameraLauncherActivity.java:195)
12-05 01:50:12.091: W/System.err(8354):     at com.example.camera.CameraLauncherActivity$LoadSingleTrack.doInBackground(CameraLauncherActivity.java:1)
12-05 01:50:12.100: W/System.err(8354):     at android.os.AsyncTask$2.call(AsyncTask.java:287)
12-05 01:50:12.100: W/System.err(8354):     at java.util.concurrent.FutureTask.run(FutureTask.java:234)
12-05 01:50:12.140: I/Choreographer(8354): Skipped 65 frames!  The application may be doing too much work on its main thread.
12-05 01:50:12.360: I/Choreographer(8354): Skipped 55 frames!  The application may be doing too much work on its main thread.
12-05 01:50:12.370: W/System.err(8354):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
12-05 01:50:12.620: I/Choreographer(8354): Skipped 65 frames!  The application may be doing too much work on its main thread.
12-05 01:50:12.831: W/System.err(8354):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
12-05 01:50:12.831: W/System.err(8354):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
12-05 01:50:12.840: W/System.err(8354):     at java.lang.Thread.run(Thread.java:841)
12-05 01:50:12.890: I/Choreographer(8354): Skipped 70 frames!  The application may be doing too much work on its main thread.
12-05 01:50:13.200: I/Choreographer(8354): Skipped 82 frames!  The application may be doing too much work on its main thread.
12-05 01:50:13.460: D/CameraLauncherActivity(8354): customFolder :: null Event_null-05-12-2013
12-05 01:50:13.460: I/Choreographer(8354): Skipped 65 frames!  The application may be doing too much work on its main thread.
12-05 01:50:17.000: D/CameraLauncherActivity(8354): mCamera.takePicture :: android.hardware.Camera@41968f50
12-05 01:50:18.580: D/CameraLauncherActivity(8354): mCamera.takePicture :: android.hardware.Camera@41968f50
12-05 01:50:21.241: D/Count(8354): /mnt/sdcard/Pictures/CaptureImages/null Event_null-05-12-2013/IMG_20131205_001321.jpg
12-05 01:50:21.241: D/Count(8354): /mnt/sdcard/Pictures/CaptureImages/null Event_null-05-12-2013/IMG_20131205_015017.jpg
12-05 01:50:21.250: D/Count(8354): /mnt/sdcard/Pictures/CaptureImages/null Event_null-05-12-2013/IMG_20131205_015018.jpg
12-05 01:50:21.530: I/Choreographer(8354): Skipped 47 frames!  The application may be doing too much work on its main thread.
12-05 01:50:22.900: D/dalvikvm(8354): GC_FOR_ALLOC freed 180K, 3% free 12821K/13128K, paused 589ms, total 619ms
12-05 01:50:24.810: D/dalvikvm(8354): GC_FOR_ALLOC freed 56K, 3% free 14012K/14332K, paused 626ms, total 662ms
12-05 01:50:26.550: D/dalvikvm(8354): GC_FOR_ALLOC freed 34K, 2% free 15225K/15536K, paused 569ms, total 570ms
12-05 01:50:26.800: I/Choreographer(8354): Skipped 1372 frames!  The application may be doing too much work on its main thread.
12-05 01:50:28.980: I/Choreographer(8354): Skipped 70 frames!  The application may be doing too much work on its main thread.

最佳答案

在此处查找 CameraLauncherActivity.java 的更新代码:

static boolean isReturning = false;
     public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_camera);

        mCamera = getCameraInstance();

        mCameraPreview = new PreviewSurface(this, mCamera);
        FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
        preview.addView(mCameraPreview);


        Bundle extras = getIntent().getExtras();
        if (extras != null) {
            String value = extras.getString("folder_name");
            isReturning = extras.getBoolean("isReturning");
            Log.d(CameraLauncherActivity.LOG_TAG, "folder_name :: " + value);    
        }


        Button captureButton = (Button) findViewById(R.id.btnCapture);
        Log.d(CameraLauncherActivity.LOG_TAG, "captureButton :: " + captureButton);
        captureButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mCamera.takePicture(null, null, mPicture);
                Log.d(CameraLauncherActivity.LOG_TAG, "mCamera.takePicture :: " + mCamera);                                         
            }
        });

        Button viewButton = (Button) findViewById(R.id.btnView);
        Log.d(CameraLauncherActivity.LOG_TAG, "SingleAngelActivityButton :: " + viewButton);
        viewButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {             

                Intent intentNewEvent = new Intent(CameraLauncherActivity.this, UploadActivity.class);
                String event_id = customFolder;
                intentNewEvent.putExtra("event_id", event_id);
                startActivity(intentNewEvent);        
            }
        });

        cd = new ConnectionDetector(getApplicationContext());

        // Check if Internet present
        if (!cd.isConnectingToInternet()) {
            // Internet Connection is not present
            alert.showAlertDialog(CameraLauncherActivity.this, "Internet Connection Error",
                    "Please connect to working Internet connection", false);
            // stop executing code by return
            return;
        }

    // Get event id, angel id
    Intent i = getIntent();
    event_id = i.getStringExtra("event_id");
    angel_id = i.getStringExtra("angel_id");

    // calling background thread
    new LoadSingleTrack().execute();
}



/**
 * Background Async Task to get single angel information
 * */
class LoadSingleTrack extends AsyncTask<String, String, String> {

    /**
     * Before starting background thread Show Progress Dialog
     * */
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(CameraLauncherActivity.this);
        pDialog.setMessage("Initializing Camera...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(false);
        pDialog.show();
    }

    /**
     * getting angel json and parsing
     * */
    protected String doInBackground(String... args) {
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();

        // post event id, angel id as GET parameters
        params.add(new BasicNameValuePair("event", event_id));
        params.add(new BasicNameValuePair("angel", angel_id));

        // getting JSON string from URL
        String json = jsonParser.makeHttpRequest(URL_angel, "GET",
                params);

        // Check your log cat for JSON reponse
        Log.d("Single Track JSON: ", json);

        try {
            JSONObject jObj = new JSONObject(json);
            if(jObj != null){
                angel_name = jObj.getString(TAG_ANGEL);
                event_name = jObj.getString(TAG_EVENT);
            }           

        } catch (JSONException e) {
            e.printStackTrace();
        }

        return null;
    }

    /**
     * After completing background task Dismiss the progress dialog
     * **/
    protected void onPostExecute(String file_url) {
        // dismiss the dialog after getting angel information
        pDialog.dismiss();

        // updating UI from Background Thread
        runOnUiThread(new Runnable() {
            public void run() {

                TextView txt_angel_name = (TextView) findViewById(R.id.angel_title);
                String timeStamp = new SimpleDateFormat("dd-MM-yyyy").format(new Date());

                txt_angel_name.setText(event_name + " Event_"+ angel_name + "-" + timeStamp);

     if(!isReturning){
         customFolder = txt_angel_name.getText().toString();
     }else{
         customFolder = extras.getString("folder_name");
     }
                Log.d(CameraLauncherActivity.LOG_TAG, "customFolder :: " + customFolder);

                             // Change Activity Title with angel title
                setTitle(angel_name);

                // folder name
                mediaStorageDir = new File(
                        Environment
                                .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
                                "/CaptureImages/"+ customFolder + "/");

                if (!mediaStorageDir.exists()) {
                    if (!mediaStorageDir.mkdirs()) {
                        Log.d("App", "failed to create directory");                  
                    }
                }                   
            }
        });
    }
}

/**
 * Helper method to access the camera returns null if it cannot get the
 * camera or does not exist
 * 
 * @return
 */
private Camera getCameraInstance() {

    Camera camera = null;
    Log.d(CameraLauncherActivity.LOG_TAG, "getCameraInstance()Camera:: " + camera);
    try {
        camera = Camera.open(0);
        Log.d(CameraLauncherActivity.LOG_TAG, "getCameraInstance()open:: " + camera);
    } catch (Exception e) {
        // cannot get camera or does not exist
    }
    return camera;
}

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(mediaStorageDir.getPath() + File.separator
            + "IMG_" + timeStamp + ".jpg");

    return mediaFile;
}

现在在 Upload.java 下:

final Button button = (Button) findViewById(R.id.buttonBack);
    button.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            // Perform action on click

            Intent i = new Intent(getApplicationContext(), CameraLauncherActivity.class);
            i.putExtra("folder_name", CameraLauncherActivity.customFolder);
            i.putExtras("isReturning", true);
            startActivity(i);
        }
    });

就是这样。现在它应该可以按需工作了!希望这有帮助

关于android - onCreate() 中附加项的空值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20326120/

24 4 0
文章推荐： c - 如何使用 GDB 查找字符串在内存中的地址？
文章推荐： android - 限制 Aviary 功能
文章推荐： c - 没有越界错误
文章推荐： Android-谷歌地图 V2 : Trace route from current position to an other destination
太空狗
个人简介

我是一名优秀的程序员,十分优秀！

滴滴打车优惠券免费领取
滴滴打车优惠券
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com