L'application se bloque après une connexion réussie via l'émulateur Android

Question

J'utilise mon point de terminaison d'application Web pour créer une application Android de connexion native. Mais lors de la tentative de connexion, je peux voir le résultat de connexion réussie sur le journal de la console. Mais je veux que cette activité soit redirigée vers une autre activité. Ci-dessous je suis annonce ma

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> 
    <manifest 
    xmlns:android="http://schemas.android.com/apk/res/android" 
     package="com.example.reception.farbinder_test"> 
<uses-permission android:name="android.permission.INTERNET"/> 
<uses-permission 
android:name="android.permission.READ_EXTERNAL_STORAGE" /> 

      <application 
      android:allowBackup="true" 
      android:icon="@mipmap/ic_launcher" 
       android:label="@string/app_name" 
      android:roundIcon="@mipmap/ic_launcher_round" 
      android:supportsRtl="true" 
      android:theme="@style/AppTheme"> 
      <activity android:name=".MainActivity"> 
      <intent-filter> 
      <action android:name="android.intent.action.MAIN"/> 

      <category 
      android:name="android.intent.category.LAUNCHER"/> 
      </intent-filter> 
      </activity> 
      <activity android:name=".ResponseActivity"></activity> 
       <activity android:name=".SettingsActivity"></activity> 
       </application> 
       </manifest> 

mainactivity.java

   public class MainActivity extends AppCompatActivity 
       implements 
       View.OnClickListener { 

       private List<String> stringList; 
      private ListView list; 
      private LoginPOJO jsonResponse; 
      EditText etUserName; 
      EditText etPassword; 
      ImageView btnLogin; 


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

      jsonResponse = new LoginPOJO(); 

      // UserLogin Field 
      etUserName = (EditText) findViewById(R.id.etUserName); 
      // UserLogin Password 
      etPassword = (EditText) findViewById(R.id.etPassword); 
      // Login Button Image 
      btnLogin = (ImageView) findViewById(R.id.btnLogin); 
      btnLogin.setOnClickListener(this); 
      // User SignUp Button Image 
      ImageView btnSignUp = (ImageView) 
      findViewById(R.id.btnSignUp); 
      btnSignUp.setOnClickListener(this); 
      // Forget Password Textbutton 
      TextView frgtPassword = (TextView) 
      findViewById(R.id.forgetpassword); 
      frgtPassword.setOnClickListener(this); 
      // Skip for now button 
      final TextView skipfornow = (TextView) 
       findViewById(R.id.skipnow); 
      skipfornow.setOnClickListener(this); 

      } 

       private void 
      logIn(final String username, final String password) 
       { 
      final ProgressDialog progressDialog = new 
      ProgressDialog(MainActivity.this); 
      progressDialog. 
      setProgressStyle(ProgressDialog.STYLE_SPINNER); 
      progressDialog.setMessage("Logging you in..."); 
      progressDialog.setIndeterminate(true); 
      progressDialog.setCancelable(false); 
      progressDialog.show(); 
      String UPLOAD_URL = "http://xxxxx- 
      dev.elasticbeanstalk.com/api/v1/login"; 
      final StringRequest stringRequest = new 
      StringRequest(Request.Method.POST, UPLOAD_URL, 
      new Response.Listener<String>() { 
       @Override 
       public void onResponse(String s) { 
        //Dismissing the progress dialog 
        progressDialog.dismiss(); 
        // Getting the final Json Object 
        JSONObject parentObject; 
        try { 
         parentObject = new JSONObject(s); 

         // Getting the data from Data Json Object 
         JSONObject dataObject = 
       parentObject.getJSONObject("data"); 

         // Getting data from Geo object 
         JSONObject geoObject = 
       dataObject.getJSONObject("geo"); 

         // Getting data from businesses Array 
         JSONArray businessesArray = 
       dataObject.getJSONArray("businesses"); 

         // Getting data from Meta Object 
         JSONObject metaObject = 
       parentObject.getJSONObject("meta"); 

         startActivity(new Intent(MainActivity.this, 
       ResponseActivity.class)); 
        } catch (JSONException e) { 
         e.printStackTrace(); 
        } 
        //Showing toast message of the response 
        Log.i("TAG", "onResponse: " + s); 

       } 
      }, 
      new Response.ErrorListener() { 
       @Override 
       public void onErrorResponse(VolleyError volleyError) 
       { 
        //Dismissing the progress dialog 
        progressDialog.dismiss(); 
        //Showing snackbar 
        Toast.makeText(MainActivity.this, "Connection 
       Problem", Toast.LENGTH_SHORT).show(); 
       } 
      }) { 
      @Override 
      protected Map<String, String> getParams() throws 
      AuthFailureError { 
      //Converting Bitmap to String 
      //Creating parameters 
      Map<String, String> params = new Hashtable<>(); 
      params.put("apikey", Utilities.API_KEY); 
      params.put("secret", Utilities.SECRET_KEY); 
      params.put("email", username); 
      params.put("password",password); 
      //Adding parameters 
      //returning parameters 
      return params; 
       } 
       }; 
      //Creating a Request Queue 
      RequestQueue requestQueue =Volley.newRequestQueue(this); 
      //Adding request to the queue 
       requestQueue.add(stringRequest); 
       } 
       private void forgetPassword(final String userName) { 
       final ProgressDialog progressDialog = new 
       ProgressDialog(MainActivity.this); 
       progressDialog.setProgressStyle 
       (ProgressDialog.STYLE_SPINNER); 
       progressDialog.setMessage("Logging you in..."); 
       progressDialog.setIndeterminate(true); 
       progressDialog.setCancelable(false); 
       progressDialog.show(); 
       String UPLOAD_URL = "http://xxxxxx- 
      dev.elasticbeanstalk.com/api/v1/request_password_reset"; 
      final StringRequest stringRequest = new 
       StringRequest(Request.Method.POST, UPLOAD_URL, 
       new Response.Listener<String>() { 
       @Override 
       public void onResponse(String s) { 
        //Dismissing the progress dialog 
        progressDialog.dismiss(); 
        // Getting the final Json Object 
        JSONObject parentObject; 
        try { 
         parentObject = new JSONObject(s); 

         // Getting the data from Data Json Object 
         JSONObject dataObject = 
       parentObject.getJSONObject("data"); 

         // Getting data from Geo object 
         JSONObject geoObject = 
       dataObject.getJSONObject("geo"); 

         // Getting data from businesses Array 
         JSONArray businessesArray = 
       dataObject.getJSONArray("businesses"); 

         // Getting data from Meta Object 
         JSONObject metaObject = 
       parentObject.getJSONObject("meta"); 

         startActivity(new Intent(MainActivity.this, 
       ResponseActivity.class)); 
        } catch (JSONException e) { 
         e.printStackTrace(); 
        } 
        //Showing toast message of the response 
        Log.i("TAG", "onResponse: " + s); 

       } 
      }, 
      new Response.ErrorListener() { 
       @Override 
       public void onErrorResponse(VolleyError volleyError) 
      { 
        //Dismissing the progress dialog 
        progressDialog.dismiss(); 
        //Showing snackbar 
        Toast.makeText(MainActivity.this, "Connection 
      Problem", Toast.LENGTH_SHORT).show(); 
       } 
      }) { 
      @Override 
      protected Map<String, String> getParams() throws 
      AuthFailureError { 
      //Converting Bitmap to String 
      //Creating parameters 
      Map<String, String> params = new Hashtable<>(); 
      params.put("apikey", Utilities.API_KEY); 
      params.put("secret", Utilities.SECRET_KEY); 
      params.put("email", userName); 
      //Adding parameters 
      //returning parameters 
      return params; 
      } 
       }; 
      //Creating a Request Queue 
      RequestQueue requestQueue = Volley.newRequestQueue(this); 
      //Adding request to the queue 
      requestQueue.add(stringRequest); 
      } 

      private void signUp() { 

      Intent singUppage = new 
      Intent(MainActivity.this,ResponseActivity.class); 
      startActivity(singUppage); 

      } 
      private void skipForNow(){ 
      Intent skipForNowPage = new 
      Intent(MainActivity.this,ResponseActivity.class); 
      startActivity(skipForNowPage); 
      } 



      @Override 
      public void onClick(View v) { 
      switch (v.getId()) { 
      case R.id.btnLogin: { 
      String username = etUserName.getText().toString().trim(); 
      String password = etPassword.getText().toString().trim(); 
      logIn(username, password); 
      break; 
      } 
      case R.id.forgetpassword: { 
      String username = etUserName.getText().toString().trim(); 
      forgetPassword(username); 
      break; 
      } 
      case R.id.btnSignUp:{ 
      signUp(); 
      break; 
      } 
      case R.id.skipnow:{ 
      skipForNow(); 
      break; 
      } 
      } 
      } 

activitymain.xml

  <?xml version="1.0" encoding="utf-8"?> 
      <LinearLayout 
      xmlns:android="http://schemas.android.com/apk/res/android" 
      xmlns:app="http://schemas.android.com/apk/res-auto" 
      xmlns:tools="http://schemas.android.com/tools" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:orientation="vertical" 
      tools:context="com.example.reception.xxx.MainActivity"> 

      <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="0dp" 
      android:layout_weight="1" 
      android:background="@drawable/signin_bg" 
      android:orientation="vertical" 
      android:paddingEnd="20dp" 
      android:paddingLeft="20dp" 
      android:paddingRight="20dp" 
      android:paddingStart="20dp" 
      android:weightSum="1"> 

      <ImageView 
      android:id="@+id/imageView" 
      android:layout_width="wrap_content" 
      android:layout_height="40dp" 
      android:contentDescription="@string/farbinder_text" 
      android:src="@drawable/vdsss"/> 

      <ImageView 
      android:id="@+id/facebookSigninButton" 
      android:layout_width="343dp" 
      android:layout_height="76dp" 
      android:contentDescription="@string/connect_with_facebook" 
      android:src="@drawable/signin_fb"/> 

      <ImageView 
      android:layout_width="match_parent" 
      android:layout_height="92dp" 
      android:contentDescription="@string/connect_with_twitter" 
      android:src="@drawable/signin_twitter"/> 

      <ImageView 
      android:id="@+id/btnSignUp" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:contentDescription="@string/signup_with_email" 
      android:src="@drawable/signup_button"/> 

      <TextView 
      android:id="@+id/skipnow" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_gravity="center_horizontal" 
      android:text="@string/skip_login_for_now" 
      android:textColor="#FFF" 
      android:textSize="16sp"/> 

      </LinearLayout> 

      <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="187dp" 
      android:orientation="vertical" 
      android:paddingLeft="20dp" 
      android:paddingStart="20dp" 
      android:paddingEnd="20dp" 
      android:paddingRight="20dp" 
      android:paddingBottom="5dp"> 

      <EditText 
       android:id="@+id/etUserName" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:autoLink="email" 
       android:hint="@string/enter_email" 
       android:inputType="text"/> 

      <EditText 
       android:id="@+id/etPassword" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:inputType="textPassword" 
       android:hint="@string/enter_password"/> 

       <ImageView 
       android:id="@+id/btnLogin" 
       android:layout_width="match_parent" 
       android:layout_height="63dp" 
      android:contentDescription="@string/sign_in" 
       android:src="@drawable/signin_button"/> 

       <TextView 
       android:id="@+id/forgetpassword" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:text="@string/forgot_password" 
       android:textSize="16sp" 
       android:layout_gravity="center_horizontal"/> 

       </LinearLayout> 

      </LinearLayout> 

activityresponse.xml

  <?xml version="1.0" encoding="utf-8"?> 
      <LinearLayout 
      xmlns:android="http://schemas.android.com/apk/res/android" 
      xmlns:app="http://schemas.android.com/apk/res-auto" 
      xmlns:tools="http://schemas.android.com/tools" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:orientation="vertical" 
      android:padding="16dp"  
      tools:context= 
      "com.example.reception.xxxx.MainActivity"> 
      <TextView 
      android:id="@+id/tvStatus" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textSize="20sp" 
      android:layout_gravity="center_horizontal"/> 
      <ImageView 
      android:id="@+id/backArrow" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:scaleType="center" 
      android:src="@drawable/backarrow" 
      android:contentDescription="@string/backarrow" 
     /> 
     <ImageView 
     android:id="@+id/image" 
     android:layout_width="match_parent" 
     android:layout_height="240dp" 
     android:scaleType="centerCrop"/> 
     <Button 
      android:id="@+id/btnSelectImage" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="@string/select_image" 
      android:textAllCaps="false" 
      android:layout_gravity="center_horizontal"/> 
      </LinearLayout> 

responseactivity.java

  public class ResponseActivity extends AppCompatActivity 
      implements 
      View.OnClickListener { 
      private final int IMAGE_REQUEST_CODE = 5; 
      private ImageView ivImage; 
      private Bitmap selectedImage; 
      @Override 
      protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_response); 
      TextView tvResponse = (TextView) 
      findViewById(R.id.tvStatus); 
      ivImage = (ImageView) findViewById(R.id.image); 
      ImageView etSignUp = (ImageView) 
      findViewById(R.id.btnSignUp); 
      etSignUp.setOnClickListener(this); 
      ImageView backArrow = 
      (ImageView)findViewById(R.id.backArrow); 
      backArrow.setOnClickListener(this); 
      } 
      private void backArrow(){ 
      Intent bckArrow = new 
      Intent(ResponseActivity.this,MainActivity.class); 
      startActivity(bckArrow); 
      } 
      private void signUp(){ 
      Intent signUp = new 
      Intent(ResponseActivity.this,SettingsActivity.class); 
      startActivity(signUp); 
      } 

      @Override 
      public void onClick(View v) { 
      switch (v.getId()) { 
      case R.id.backArrow:{ 
      backArrow(); 
      break; 
      } 
      case R.id.btnSignUp:{ 
      signUp(); 
      break; 
      } 

      } 
      } 

Answer 1

Le problème est ici:

ImageView etSignUp = (ImageView)findViewById(R.id.btnSignUp); 
etSignUp.setOnClickListener(this); 

vous ne disposez pas d'un imageview avec id btnSignUp dans votre mise en page ResponseActivity .

Voilà pourquoi il donne une nullpointerException du imageview