アンドロイド関連スピナー

Question

アンドロイド関連スピナーの実行方法は？

私はこのようにそれを行っている：

プライベートスピナーddlCountry、ddlCategory。 onItemSelectedを繰り返しますすなわち

@Override 
public void onCreate(Bundle savedInstanceState) { 
    try { 
     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.pnplandingpage); 

     ddlCountry = (Spinner) findViewById(R.id.ddlCountry); 
     ddlCategory = (Spinner) findViewById(R.id.ddlCategory); 

     // BindCountry(ddlCountry); 

     // ddlCountry 
     // .setOnItemSelectedListener(new OnCountryItemSelectedListener()); 

     // ddlCategory 
     // .setOnItemSelectedListener(new 
     // OnCategoryItemSelectedListener()); 

     // ArrayAdapter<CharSequence> adapter = ArrayAdapter 
     // .createFromResource(this, R.array.Country_array, 
     // android.R.layout.simple_spinner_item); 
     // adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
     // ddlCountry.setAdapter(adapter); 

     ddlCountry.setOnItemSelectedListener(new OnItemSelectedListener() { 
      public void onItemSelected(AdapterView<?> parent, View pview, 
        int pos, long id) { 

       final String[] array = new String[] { "Category", 
         "5 Miles", "10 Miles", "15 Miles", "20 Miles", 
         "25 Miles", }; 

       List<String> list = new ArrayList<String>(); 
       for (int i = 0; i < array.length; i++) { 
        list.add(array[i]); 
       } 

       ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(
         PNPLandingPage.this, 
         android.R.layout.simple_spinner_item, list); 
       dataAdapter 
         .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
       ddlCategory.setAdapter(dataAdapter); 

       Toast.makeText(
         parent.getContext(), 
         "The Country is " 
           + parent.getItemAtPosition(pos).toString(), 
         Toast.LENGTH_LONG).show(); 
      } 

      public void onNothingSelected(AdapterView parent) { 
       // Do nothing. 
       ddlCategory.setAdapter(null); 

      } 
     }); 

     // BindCategory(ddlCategory); 

     // ddlCategory 
     // .setOnItemSelectedListener(new OnCategoryItemSelectedListener()); 

     ddlCategory.setOnItemSelectedListener(new OnItemSelectedListener() { 
      public void onItemSelected(AdapterView<?> parent, View pview, 
        int pos, long id) { 

       final String[] array = new String[] { "Country", 
         "Country1", "Country2", "Country3", "Country4", 
         "Country5", }; 


       List<String> list = new ArrayList<String>(); 
       for (int i = 0; i < array.length; i++) { 
        list.add(array[i]); 
       } 

       ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(
         PNPLandingPage.this, 
         android.R.layout.simple_spinner_item, list); 
       dataAdapter 
         .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
       ddlCountry.setAdapter(dataAdapter); 

       // ddlCategory 
       // .setOnItemSelectedListener(new 
       // OnCategoryItemSelectedListener()); 

       Toast.makeText(
         parent.getContext(), 
         "The Category is " 
           + parent.getItemAtPosition(pos).toString(), 
         Toast.LENGTH_LONG).show(); 
      } 

      public void onNothingSelected(AdapterView parent) { 
       // Do nothing. 
       ddlCountry.setAdapter(null); 

      } 
     }); 

    } catch (Exception ex) { 
     Toast.makeText(getApplication(), "EXCEPTION :" + ex, 1000); 
    } 
} 

しかし、トーストは、毎回トリガーされます。何が私はあなたが任意のスピナーにsetOnItemSelectedListener（）を設定したときに、それが発火するよう

Answer 1

私は問題があると思い、

デフォルトでは（あなたがそれに割り当てられているか、または配列）、リストの最初の項目を選択します..だから間違いをしていますonItemSelected（）が選択されています。

あなたのケースでは、両方のスピナーがItemItem（）メソッドを実行しています。したがって、それらは無限ループの一種です。

編集回答

final String[] array = new String[] 
     { "Country", "Country1", "Country2", "Country3", "Country4", "Country5", }; 

     List<String> list = new ArrayList<String>(); 
     for (int i = 0; i < array.length; i++) 
     { 
      list.add(array[i]); 
     } 

     ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(TwoSpinners.this, android.R.layout.simple_spinner_item, list); 
     dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
     ddlCountry.setAdapter(dataAdapter); 

     ddlCountry.setOnItemSelectedListener(new OnItemSelectedListener() 
     { 
      public void onItemSelected(AdapterView<?> parent, View pview, int pos, long id) 
      { 
       if (!parent.getItemAtPosition(pos).toString().equals("Country")) 
       { 
        final String[] array = new String[] 
        { "Category", "5 Miles", "10 Miles", "15 Miles", "20 Miles", "25 Miles", }; 

        List<String> list = new ArrayList<String>(); 
        for (int i = 0; i < array.length; i++) 
        { 
         list.add(array[i]); 
        } 

        ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(TwoSpinners.this, android.R.layout.simple_spinner_item, list); 
        dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
        ddlCategory.setAdapter(dataAdapter); 

        Toast.makeText(parent.getContext(), "The Country is " + parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show(); 
       } 
      } 

      public void onNothingSelected(AdapterView parent) 
      { 
       // Do nothing. 
       ddlCategory.setAdapter(null); 

      } 
     }); 

     // BindCategory(ddlCategory); 

     // ddlCategory 
     // .setOnItemSelectedListener(new OnCategoryItemSelectedListener()); 

     ddlCategory.setOnItemSelectedListener(new OnItemSelectedListener() 
     { 
      public void onItemSelected(AdapterView<?> parent, View pview, int pos, long id) 
      { 

       if (!parent.getItemAtPosition(pos).toString().equals("Category")) 
       { 

        final String[] array = new String[] 
        { "Country", "Country1", "Country2", "Country3", "Country4", "Country5", }; 

        List<String> list = new ArrayList<String>(); 
        for (int i = 0; i < array.length; i++) 
        { 
         list.add(array[i]); 
        } 

        ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(TwoSpinners.this, android.R.layout.simple_spinner_item, list); 
        dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
        ddlCountry.setAdapter(dataAdapter); 

        // ddlCategory 
        // .setOnItemSelectedListener(new 
        // OnCategoryItemSelectedListener()); 

        Toast.makeText(parent.getContext(), "The Category is " + parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show(); 
       } 
      } 

      public void onNothingSelected(AdapterView parent) 
      { 
       // Do nothing. 
       ddlCountry.setAdapter(null); 

      } 
     }); 

Answer 2

私はまったく同じinfiteループを持っていました。 onItemSelected()、setContentView()と私のクラスメソッドsetupSpinner()で呼び出すと、この方法では、私は再びonItemSelected()を呼び出すmspinner.setOnItemSelectedListener(this)を行う...私のハンドラで固定

：handler.postDelayed(myRunnable, 500) 500ミリ秒の遅延で。ランナブルには、mspinner.setOnItemSelectedListener(this)