选择微调器值时出错

Question

在我的 android 应用程序中，对于国家或城市，我使用了 android 的微调器小部件。在那种情况下，首先，将数据从数据库加载到微调器中，它工作得很好。我在微调器中有国家列表，它是从数据库加载的。我的问题是，当用户点击微调器选择国家时，用户会收到错误消息。我附上了错误日志，请参考。帮我。提前致谢。我的问题已解决，但出现新错误。查看我的错误日志完整源代码

 Private class Question2Activity extends AppCompactActivity implements View.OnClickListener, AdapterView.OnItemSelectedListener
 {
 private static final String PATH_TO_SERVER = "http://192.168.1.103/lab/android_login_example/selectcountries.php";
private static final String SELECT_CITI = "http://192.168.1.103/lab/android_login_example/selectciti.php";

  AppCompatSpinner spCity, upcountry;

  @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_question2);

    mContext = getApplicationContext();
    // Get the activity
    mActivity = Question2Activity.this;

    // activity_question_detail = (RelativeLayout) findViewById(R.id.activity_question_detail);

    LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(LAYOUT_INFLATER_SERVICE);

    // Inflate the custom layout/view
    View customView = inflater.inflate(R.layout.raw_question2, null);

    mPopupWindow = new android.widget.PopupWindow(
            customView,
            ViewGroup.LayoutParams.WRAP_CONTENT,
            ViewGroup.LayoutParams.WRAP_CONTENT
    );

    mPopupWindow.setAnimationStyle(R.style.PopupAnimation);

    if (Build.VERSION.SDK_INT >= 21) {
        mPopupWindow.setElevation(5.0f);
    }

    mPopupWindow.setFocusable(true);
    mPopupWindow.update();

    spCountry = (AppCompatSpinner) customView.findViewById(R.id.spCountry);
    spCity = (AppCompatSpinner) customView.findViewById(R.id.spCity);
      btnNext = (Button) customView.findViewById(R.id.btnNext);

    progressDialog = new ProgressDialog(this);
    progressDialog.setCancelable(false);


    btnNext.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Question2User(stCountry, stCity);
            finish();
        }

    });


    requestJsonObject();
    requestJsonObjectforCiti();

    spCountry.setOnItemSelectedListener(this);
    spCity.setOnItemSelectedListener(this);

    findViewById(R.id.activity_question_detail).post(new Runnable() {
        public void run() {
            mPopupWindow.showAtLocation(findViewById(R.id.activity_question_detail), Gravity.CENTER, 0, 0);
        }
    });
}
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
    if (adapterView.getId() == R.id.spCountry) {

        stCountry = spCountry.getSelectedItem().toString();
        Log.d("spinner", spCountry.getSelectedItem().toString());
    } else if (adapterView.getId() == R.id.spCity) {

        stCity = spCity.getSelectedItem().toString();
        Log.d("spinner", spCity.getSelectedItem().toString());
    }
}

@Override
public void onNothingSelected(AdapterView<?> adapterView) {

}
}

 private void requestJsonObject() {
    RequestQueue queue = Volley.newRequestQueue(this);
    StringRequest stringRequest = new StringRequest(Request.Method.GET, PATH_TO_SERVER, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            GsonBuilder builder = new GsonBuilder();
            Gson mGson = builder.create();
            spinnerData = Arrays.asList(mGson.fromJson(response, DataObject[].class));
            //display first question to the user
            if (null != spinnerData) {
                assert spCountry != null;
                adapter.SpinnerAdapter spinnerAdapter = new adapter.SpinnerAdapter(Question2Activity.this, spinnerData);
                spCountry.setAdapter(spinnerAdapter);
            }
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
        }
    });
    queue.add(stringRequest);
}

private void requestJsonObjectforCiti() {
    RequestQueue queue = Volley.newRequestQueue(this);
    StringRequest stringRequest = new StringRequest(Request.Method.GET, SELECT_CITI, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            GsonBuilder builder = new GsonBuilder();
            Gson mGson = builder.create();
            spinnerData = Arrays.asList(mGson.fromJson(response, DataObject[].class));
            //display first question to the user
            if (null != spinnerData) {
                assert spCity != null;
                adapter.SpinnerAdapter spinnerAdapter = new adapter.SpinnerAdapter(Question2Activity.this, spinnerData);
                spCity.setAdapter(spinnerAdapter);
            }
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
        }
    });
    queue.add(stringRequest);
}

Answer 1

您必须使用 AdapterView.OnItemSelectedListener 实现您的 class 并重写此方法，下面给出的代码可能对您有所帮助插入 XML 文件

 @Override
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
        if(adapterView.getId()==R.id.ueducation) {
            uqlification = qulification.getSelectedItem().toString();
            Log.d("spinner", qulification.getSelectedItem().toString());
        }
        else
        if(adapterView.getId()==R.id.uocuuaption) {
         uoccupation=occupation.getSelectedItem().toString();
            Log.d("spinner", occupation.getSelectedItem().toString());
        }

    }

    @Override
    public void onNothingSelected(AdapterView<?> adapterView) {

    }



    <android.support.v7.widget.AppCompatSpinner
            android:id="@+id/ueducation"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="@dimen/_5sdp"
            android:entries="@array/education"
            android:padding="@dimen/_10sdp"></android.support.v7.widget.AppCompatSpinner>

        <android.support.v7.widget.AppCompatSpinner
            android:id="@+id/uocuuaption"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="@dimen/_5sdp"
            android:entries="@array/ustatus"
            android:padding="@dimen/_10sdp"></android.support.v7.widget.AppCompatSpinner>

看例子：

public class User_Detail extends AppCompatActivity implements View.OnClickListener,AdapterView.OnItemSelectedListener {

    AppCompatSpinner qulification, occupation;
    String uqlification="Select",uoccupation="Select";



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

        //fetch the spinners view
        qulification = (AppCompatSpinner) findViewById(R.id.ueducation);
        occupation = (AppCompatSpinner) findViewById(R.id.uocuuaption);


        //attac the setItemSelected linstener
        qulification.setOnItemSelectedListener(this);
        occupation.setOnItemSelectedListener(this);

    }



    }




    @Override
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
        if(adapterView.getId()==R.id.ueducation) {
            uqlification = qulification.getSelectedItem().toString();
            Log.d("spinner", qulification.getSelectedItem().toString());
        }
        else
        if(adapterView.getId()==R.id.uocuuaption) {
         uoccupation=occupation.getSelectedItem().toString();
            Log.d("spinner", occupation.getSelectedItem().toString());
        }

    }

    @Override
    public void onNothingSelected(AdapterView<?> adapterView) {

    }
}

选择微调器值时出错

Error during spinner value selection

android

popupwindow