Question

这是我使用Android Studio的Android上传图片代码。我的应用程序在捕获图像后崩溃（应用程序已停止工作），但它在虚拟仿真器（同样的API 19）中表现良好，并且logcat告诉我在执行后台时发生错误。有人可以帮我找出我的错误吗？

 protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);

            button = (Button)findViewById(R.id.start);
            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    getFileUri();
                    i.putExtra(MediaStore.EXTRA_OUTPUT,file_uri);
                    startActivityForResult(i,10);
                }
            });
        }
    private void getFileUri() {
            image_name = "testing123.jpg";
            file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)
                    +File.separator + image_name);
            file_uri = Uri.fromFile(file);
        }

        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
             if(requestCode == 10 && resultCode==RESULT_OK)
             {
                new Encode_image().execute();
             }
        }


        private class Encode_image extends AsyncTask<Void,Void,Void>{
            @Override
            protected Void doInBackground(Void... voids) {
                bitmap = BitmapFactory.decodeFile(file_uri.getPath());
                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                bitmap.compress(Bitmap.CompressFormat.JPEG,100,stream);
                byte[] array = stream.toByteArray();
                encoded_string = Base64.encodeToString(array,0);
                return null;
            }

            @Override
            protected void onPostExecute(Void aVoid) {
                makeRequest();
            }
        }

        private void makeRequest() {
            RequestQueue requestqueue = Volley.newRequestQueue(this);
            StringRequest request = new StringRequest(Request.Method.POST, "http://mygplobang.com/tut_connection.php",
                    new Response.Listener<String>() {
                        @Override
                        public void onResponse(String response) {

                        }
                    }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {

                }
            }){
                @Override
                protected Map<String, String> getParams() throws AuthFailureError {
                    HashMap<String,String> map = new HashMap<>();
                    map.put("encoded_string",encoded_string);
                    map.put("image_name",image_name);

                    return map;
                }
            };
            requestqueue.add(request);
        }

这是错误输出：

致命异常：AsyncTask＃1 过程：com.example.jeffreykhang.kas，PID：6879 java.lang.RuntimeException：执行时发生错误 doInBackground（）在android.os.AsyncTask $ 3.done（AsyncTask.java:300）在 java.util.concurrent.FutureTask.finishCompletion（FutureTask.java:355） at java.util.concurrent.FutureTask.setException（FutureTask.java:222）在java.util.concurrent.FutureTask.run（FutureTask.java:242）在android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:231）在 java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1112）在 java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:587）在java.lang.Thread.run（Thread.java:841）引起：java.lang.NullPointerException 在 com.example.jeffreykhang.kas.MainActivity $ Encode_image.doInBackground（MainActivity.java:93）在 com.example.jeffreykhang.kas.MainActivity $ Encode_image.doInBackground（MainActivity.java:90）在android.os.AsyncTask $ 2.call（AsyncTask.java:288）在java.util.concurrent.FutureTask.run（FutureTask.java:237）在android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:231）在 java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1112）在 java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:587）在java.lang.Thread.run（Thread.java:841）

在真实设备中相机意图后Android Studio崩溃（虚拟模拟器工作正常）

0 个答案: