我正在尝试使用带有HTTP POST请求的Volley库将图像作为base64编码字符串上传到服务器 但是我在logcat上收到了这条消息：
03-02 01：20：35.412：I / dalvikvm（1538）：找不到方法android.net.TrafficStats.setThreadStatsTag，从方法com.android.volley.NetworkDispatcher.addTrafficStatsTag中引用
我的执行控制器没有到达uploadfile（）我猜，我该如何解决？
public class UploadActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.upload);
txtPercentage = (TextView) findViewById(R.id.txtPercentage);
btnUpload = (Button) findViewById(R.id.btnUpload);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
imgPreview = (ImageView) findViewById(R.id.imgPreview);
// vidPreview = (VideoView) findViewById(R.id.videoPreview);
// Changing action bar background color
// getActionBar().setBackgroundDrawable(
// new ColorDrawable(Color.parseColor(getResources().getString(
// R.color.action_bar))));
// Receiving the data from previous activity
Intent i = getIntent();
// image or video path that is captured in previous activity
imgPath = i.getStringExtra("filePath");
fileName = i.getStringExtra("fileName");
// boolean flag to identify the media type, image or video
boolean isImage = i.getBooleanExtra("isImage", true);
if (imgPath != null) {
// Displaying the image or video on the screen
previewMedia(isImage);
} else {
Toast.makeText(getApplicationContext(),
"Sorry, file path is missing!", Toast.LENGTH_LONG).show();
}
btnUpload.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// uploading the file to server
new UploadFileToServer().execute();
}
});
}
/**
* Displaying captured image/video on the screen
* */
private void previewMedia(boolean isImage) {
// Checking whether captured media is image or video
if (isImage) {
imgPreview.setVisibility(View.VISIBLE);
// vidPreview.setVisibility(View.GONE);
// bimatp factory
BitmapFactory.Options options = new BitmapFactory.Options();
// down sizing image as it throws OutOfMemory Exception for larger
// images
options.inSampleSize = 8;
final Bitmap bitmap = BitmapFactory.decodeFile(imgPath, options);
imgPreview.setImageBitmap(bitmap);
} else {
// imgPreview.setVisibility(View.GONE);
// vidPreview.setVisibility(View.VISIBLE);
// vidPreview.setVideoPath(filePath);
// start playing
// vidPreview.start();
}
}
/**
* Uploading the file to server
* */
private class UploadFileToServer extends AsyncTask<Void, Integer, String> {
@Override
protected void onPreExecute() {
// setting progress bar to zero
progressBar.setProgress(0);
super.onPreExecute();
}
@Override
protected void onProgressUpdate(Integer... progress) {
// Making progress bar visible
progressBar.setVisibility(View.VISIBLE);
// updating progress bar value
progressBar.setProgress(progress[0]);
// updating percentage value
txtPercentage.setText(String.valueOf(progress[0]) + "%");
}
@Override
protected String doInBackground(Void... params) {
encodeImageToString();
return uploadFile();
}
private String encodeImageToString() {
BitmapFactory.Options options = null;
options = new BitmapFactory.Options();
options.inSampleSize = 3;
bitmap = BitmapFactory.decodeFile(imgPath, options);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
// Must compress the Image to reduce image size to make upload easy
bitmap.compress(Bitmap.CompressFormat.PNG, 50, stream);
byte[] byte_arr = stream.toByteArray();
// Encode Image to String
encodedString = Base64.encodeToString(byte_arr, 0);
//Log.e(TAG, "encode" + encodedString);
return "";
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
// showing the server response in an alert dialog
showAlert(result);
}
}
/**
* Method to show alert dialog
* */
private void showAlert(String message) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(message).setTitle("Response from Servers")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// do nothing
}
});
AlertDialog alert = builder.create();
alert.show();
}
private String uploadFile() {
Log.e("upload starting" , "");
String url = "http://fileupload.php";
String tag_json_obj = "json_obj_req";
resp = "";
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.POST, url,
null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
Log.d("Upload response", response.toString());
resp = response.toString();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("image", encodedString );
params.put("filename", fileName);
params.put("password", "password123");
return params;
}
};
// Adding request to request queue
AppController.getInstance().addToRequestQueue(jsonObjReq, tag_json_obj);
Log.e("upload finish",resp);
return resp;
}
}