当我从图库中获取图像并想要插入服务器时，它会将图像放入零字节大小。在表格中，我有两列rollno和image。我从共享首选项中获取rollno值，但它没有将rollno放在数据库表中，rollno列显示为空。
帮我解决这个问题。
这是我的代码
public class ImageEditActivity extends AppCompatActivity implements View.OnClickListener {
ImageView image;
Button btn_cancel_edit,btn_done_edit;
Bitmap bitmap;
SharedPreferences sp;
String rollno;
String KEY_Rollno = "rollno";
String KEY_IMAGE = "image";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_edit);
getSupportActionBar().hide();
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
image=(ImageView)findViewById(R.id.image);
bitmap=ProfileActivity.bitmap;
image.setImageBitmap(bitmap);
btn_done_edit = (Button) findViewById(R.id.btn_done_edit);
btn_cancel_edit = (Button) findViewById(R.id.btn_cancel_edit);
btn_done_edit.setOnClickListener(this);
btn_cancel_edit.setOnClickListener(this);
sp=getSharedPreferences("rajput",MODE_PRIVATE);
rollno=sp.getString("rollno",null);
}
@Override
public void onClick(View v) {
if(v == btn_done_edit){
uploadImage();
}
if(v == btn_cancel_edit){
onBackPressed();
}
}
public String getStringImage(Bitmap bmp){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] imageBytes = baos.toByteArray();
String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT);
return encodedImage;
}
private void uploadImage() {
String UPLOAD_URL ="http://aptronnoida.com/applock/image_insert.php";
final ProgressDialog loading = ProgressDialog.show(this,"Uploading...","Please wait...",false,false);
StringRequest stringRequest = new StringRequest(Request.Method.GET, UPLOAD_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String s) {
//Disimissing the progress dialog
loading.dismiss();
//Showing toast message of the response
Toast.makeText(ImageEditActivity.this, s , Toast.LENGTH_LONG).show();
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
//Dismissing the progress dialog
loading.dismiss();
//Showing toast
Toast.makeText(ImageEditActivity.this, "Error", Toast.LENGTH_SHORT).show();
}
}){
@Override
protected Map<String, String> getParams() throws AuthFailureError {
//Converting Bitmap to String
String image = getStringImage(bitmap);
//Creating parameters
Map<String,String> params = new Hashtable<String, String>();
//Adding parameters
params.put(KEY_Rollno,rollno);
params.put(KEY_IMAGE, image);
//returning parameters
return params;
}
};
//Creating a Request Queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue.add(stringRequest);
}
public void onBackPressed(){
super.finish();
}
}
答案 0 :(得分：0)
请尝试以下工作代码：
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Button buttonChoose;
private Button buttonUpload;
private ImageView imageView;
private EditText editTextName;
private Bitmap bitmap;
private int PICK_IMAGE_REQUEST = 1;
private String UPLOAD_URL = "http://coderzheaven.com/sample_file_upload/upload_image.php";
private String KEY_IMAGE = "image";
private String KEY_NAME = "name";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.demo);
buttonChoose = (Button) findViewById(R.id.buttonChoose);
buttonUpload = (Button) findViewById(R.id.buttonUpload);
editTextName = (EditText) findViewById(R.id.editText);
imageView = (ImageView) findViewById(R.id.imageView);
buttonChoose.setOnClickListener(this);
buttonUpload.setOnClickListener(this);
}
public String getStringImage(Bitmap bmp) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] imageBytes = baos.toByteArray();
String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT);
return encodedImage;
}
private void uploadImage() {
//Showing the progress dialog
final ProgressDialog loading = ProgressDialog.show(this, "Uploading...", "Please wait...", false, false);
StringRequest stringRequest = new StringRequest(Request.Method.POST, UPLOAD_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String s) {
//Disimissing the progress dialog
loading.dismiss();
//Showing toast message of the response
Toast.makeText(MainActivity.this, s, Toast.LENGTH_LONG).show();
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
//Dismissing the progress dialog
loading.dismiss();
//Showing toast
Toast.makeText(MainActivity.this, volleyError.getMessage().toString(), Toast.LENGTH_LONG).show();
}
}) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
//Converting Bitmap to String
String image = getStringImage(bitmap);
//Getting Image Name
String name = editTextName.getText().toString().trim();
//Creating parameters
Map<String, String> params = new Hashtable<String, String>();
//Adding parameters
params.put(KEY_IMAGE, image);
params.put("Roll_NO", "5");
//returning parameters
return params;
}
};
//Creating a Request Queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue.add(stringRequest);
}
private void showFileChooser() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
Uri filePath = data.getData();
try {
//Getting the Bitmap from Gallery
bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
//Setting the Bitmap to ImageView
imageView.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Override
public void onClick(View v) {
if (v == buttonChoose) {
showFileChooser();
}
if (v == buttonUpload) {
uploadImage();
}
}
}
参考来源：http://www.coderzheaven.com/2011/04/25/android-upload-an-image-to-a-server/
答案 1 :(得分：0)
尝试将其更改为PNG并减少以下行中的压缩
bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
要
bmp.compress(Bitmap.CompressFormat.PNG, 80, baos);
如果不起作用，请尝试以下教程 Upload image to server in android
并且您可以将图像上传为base64编码的字符串...这样更快 Upload image as baser64 encoded string in android