This is my code about Android upload image using Android Studio. My apps crash after capturing image (the apps was stopped working) but it is doing fine in virtual emulator (same API 19), and the logcat tell me an error occur while executing doing background. Can someone help me find out my mistake?
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);
}
This is the error output:
FATAL EXCEPTION: AsyncTask #1 Process: com.example.jeffreykhang.kas, PID: 6879 java.lang.RuntimeException: An error occured while executing doInBackground() at android.os.AsyncTask$3.done(AsyncTask.java:300) at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355) at java.util.concurrent.FutureTask.setException(FutureTask.java:222) at java.util.concurrent.FutureTask.run(FutureTask.java:242) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) at java.lang.Thread.run(Thread.java:841) Caused by: java.lang.NullPointerException at com.example.jeffreykhang.kas.MainActivity$Encode_image.doInBackground(MainActivity.java:93) at com.example.jeffreykhang.kas.MainActivity$Encode_image.doInBackground(MainActivity.java:90) at android.os.AsyncTask$2.call(AsyncTask.java:288) at java.util.concurrent.FutureTask.run(FutureTask.java:237) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) at java.lang.Thread.run(Thread.java:841)
