所以我正在创建一个应用程序，将表单详细信息和图像发送到远程服务器。详细信息涉及一些文本，我可以从edittexts和图像中获取，用户可以从相机或图库中获取。
我遇到的问题是提交按钮（bSubmit），我需要在单击一次后立即禁用它。问题是它被禁用但是经过很长时间后，用户有很多时间再次点击它并再次向服务器发送不同的信息。
但是我第一次点击bSubmit时，相同的数据被发送两次。有具体原因吗？
如果我再次尝试单击bSubmit按钮，我也会得到java.lang.illegalStateException.Current线程必须有一个looper。
public class MainActivity extends ActionBarActivity implements View.OnClickListener{
private EditText etName;
private Button bGallery,bTakePhoto,bSubmit;
private ImageView imReciept;
int count = 1; // To count the number of button clicks;
private String UPLOAD_URL ="http://some_url.com";
private Bitmap bitmap;
File file;
Uri file_uri_camera;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etName = (EditText) findViewById(R.id.etName);
bGallery = (Button) findViewById(R.id.bGallery);
bTakePhoto = (Button) findViewById(R.id.bTakePhoto);
bSubmit = (Button) findViewById(R.id.bSubmit);
imReciept = (ImageView) findViewById(R.id.imReciept);
bGallery.setOnClickListener(this);
bTakePhoto.setOnClickListener(this);
bSubmit.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if(v == bGallery){ //20
Intent i = new Intent(Intent.ACTION_PICK,MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i,20);
}
if(v == bTakePhoto){ //10
Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
getFileUri();
i.putExtra(MediaStore.EXTRA_OUTPUT, file_uri_camera);
startActivityForResult(i,10);
}
if(v == bSubmit){
StringRequest stringRequest = new StringRequest(Request.Method.POST, UPLOAD_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String s) {
Toast.makeText(MainActivity.this, "Data Successfully sent!",
Toast.LENGTH_LONG).show();
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
Toast.makeText(MainActivity.this, volleyError.getMessage(),
Toast.LENGTH_LONG).show();
}
}){
@Override
protected Map<String, String> getParams() throws AuthFailureError {
//Converting Bitmap to String
String image = getStringImage(bitmap);
String name = etName.getText().toString().trim();
//Creating parameters
Map<String,String> params = new Hashtable<String, String>();
//Adding parameters
params.put("image", image);
params.put("name", name);
//THIS is where the main problem is happening
if(count >1){
bSubmit.setEnabled(false);
}
count++;
//returning parameters
return params;
}
};
//Creating a Request Queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue.add(stringRequest);
}
}
//Creates a file Uri for the image taken
private void getFileUri() {
//saves the photo just taken into sdcard
String image_name = "testing123.jpg";
file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + File.separator
+ image_name);
file_uri_camera = Uri.fromFile(file);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == 10 && resultCode == RESULT_OK){
//Uri selectedImage = data.getData();
//imReciept.setImageURI(selectedImage);
bitmap = BitmapFactory.decodeFile(file_uri_camera.getPath());
imReciept.setImageBitmap(bitmap);
}
if(requestCode == 20 && resultCode == RESULT_OK && data != null){
Uri selectedImage = data.getData();
try {
//Getting the Bitmap from Gallery
bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), selectedImage);
//Setting the Bitmap to ImageView
imReciept.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
}
}
public String getStringImage(Bitmap bmp){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 50, baos);
byte[] imageBytes = baos.toByteArray();
String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT);
return encodedImage;
}
}
感谢您的帮助。我非常感激。
另外，如果你能想到其他任何可以改进的程序，请告诉我。我还是Android应用程序开发的新手。任何帮助表示赞赏。
编辑 - 为什么我在问题中得到-1？
编辑2 -
07-17 00:00:23.918 15105-15441/com.example.username.nic_volley E/Volley﹕ [14460] NetworkDispatcher.run: Unhandled exception java.lang.IllegalStateException: The current thread must have a looper!
java.lang.IllegalStateException: The current thread must have a looper!
at android.view.Choreographer$1.initialValue(Choreographer.java:96)
at android.view.Choreographer$1.initialValue(Choreographer.java:91)
at java.lang.ThreadLocal$Values.getAfterMiss(ThreadLocal.java:460)
at java.lang.ThreadLocal.get(ThreadLocal.java:65)
at android.view.Choreographer.getInstance(Choreographer.java:192)
at android.animation.ValueAnimator$AnimationHandler.<init>(ValueAnimator.java:656)
at android.animation.ValueAnimator$AnimationHandler.<init>(ValueAnimator.java:631)
at android.animation.ValueAnimator.getOrCreateAnimationHandler(ValueAnimator.java:1453)
at android.animation.ValueAnimator.cancel(ValueAnimator.java:1057)
at android.animation.AnimatorSet.cancel(AnimatorSet.java:335)
at android.animation.StateListAnimator.cancel(StateListAnimator.java:192)
at android.animation.StateListAnimator.setState(StateListAnimator.java:176)
at android.view.View.drawableStateChanged(View.java:15988)
at android.widget.TextView.drawableStateChanged(TextView.java:3659)
at android.support.v7.widget.AppCompatButton.drawableStateChanged(AppCompatButton.java:143)
at android.view.View.refreshDrawableState(View.java:16032)
at android.view.View.setEnabled(View.java:6724)
at android.widget.TextView.setEnabled(TextView.java:1446)
at com.example.username.nic_volley.MainActivity$3.getParams(MainActivity.java:133)
at com.android.volley.Request.getBody(Request.java:397)
at com.android.volley.toolbox.HurlStack.addBodyIfExists(HurlStack.java:236)
at com.android.volley.toolbox.HurlStack.setConnectionParametersForRequest(HurlStack.java:210)
at com.android.volley.toolbox.HurlStack.performRequest(HurlStack.java:106)
at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:93)
at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:105)
这是我在android studio中得到的错误
答案 0 :(得分：0)
您应该在if(v == bSubmit){之后的第一个语句中禁用该按钮。
答案 1 :(得分：0)
您的按钮未被禁用，因为您将计数器递增到代码后期。一旦你输入onClick（） - 把这个
bSubmit.setEnabled(false);
然后无法再次点击 如果转移失败，则可以重新启用按钮