Question

我有这个代码

StopAllCoroutines();

对话框的xml视图

当我第一次点击列表视图中的项目时出现对话框但是当第二次点击停止应用并给我这个错误时

 public class Activity_listview extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_activity_listview);
    LayoutInflater inflater=getLayoutInflater();
    final View v=inflater.inflate(R.layout.dialog_radiobutton,null);
    final RadioGroup radioGroup_decimalformat= (RadioGroup)v.findViewById(R.id.radioGroup_decimalformat);
    final RadioButton radioButton_decimal1=(RadioButton)findViewById(R.id.radioButton_decimal1);
    final RadioButton radioButton_decimal2=(RadioButton)findViewById(R.id.radioButton_decimal2);
    final RadioButton radioButton_decimal3=(RadioButton)findViewById(R.id.radioButton_decimal3);
    final RadioButton radioButton_decimal4=(RadioButton)findViewById(R.id.radioButton_decimal4);
    final RadioButton radioButton_decimal5=(RadioButton)findViewById(R.id.radioButton_decimal5);
    final RadioButton radioButton_decimal6=(RadioButton)findViewById(R.id.radioButton_decimal6);
    final RadioButton radioButton_decimal7=(RadioButton)findViewById(R.id.radioButton_decimal7);
    final RadioButton radioButton_decimal8=(RadioButton)findViewById(R.id.radioButton_decimal8);
    final RadioButton radioButton_decimal9=(RadioButton)findViewById(R.id.radioButton_decimal9);
    final RadioButton radioButton_decimal10=(RadioButton)findViewById(R.id.radioButton_decimal10);


   final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
    final SharedPreferences.Editor editor;

    editor =preferences.edit();
  final int decimal;



    ListView listView=(ListView)findViewById(R.id.listview);
    String list_setting []={"number of decimal format"};
    ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,android.R.id.text1,list_setting);
    listView.setAdapter(adapter);

    radioGroup_decimalformat.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {

            switch (checkedId){
                case R.id.radioButton_decimal1:
                    editor.putInt("decimal_key",1);
                    editor.commit();
                    break;
                case R.id.radioButton_decimal2:
                    editor.putInt("decimal_key",2);
                    editor.commit();
                    break;
                case R.id.radioButton_decimal3:
                    editor.putInt("decimal_key",3);
                    editor.commit();
                    break;
                case R.id.radioButton_decimal4:
                    editor.putInt("decimal_key",4);
                    editor.commit();
                    break;
                case R.id.radioButton_decimal5:
                    editor.putInt("decimal_key",5);
                    editor.commit();
                    break;
                case R.id.radioButton_decimal6:
                    editor.putInt("decimal_key",6);
                    editor.commit();
                    break;
                case R.id.radioButton_decimal7:
                    editor.putInt("decimal_key",7);
                    editor.commit();
                    break;
                case R.id.radioButton_decimal8:
                    editor.putInt("decimal_key",8);
                    editor.commit();
                    break;
                case R.id.radioButton_decimal9:
                    editor.putInt("decimal_key",9);
                    editor.commit();
                    break;
                case R.id.radioButton_decimal10:
                    editor.putInt("decimal_key",10);
                    editor.commit();
                    break;
                default:
                    editor.putInt("decimal_key",4);
                    editor.commit();
            }

        }
    });
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            if(position==0){
                final AlertDialog.Builder dialog=new AlertDialog.Builder(Activity_listview.this);
                dialog.setView(v);
                dialog.setTitle("Number of decimal format");
               dialog.setPositiveButton("Done", new DialogInterface.OnClickListener() {
                   @Override
                    public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                    }
                    });
                dialog.show();      //here the error
            }
        }
    });
      }
      }

错误的地方：dialog.show（）; 请帮帮我..

Answer 1

您的代码的问题在于您在每个列表项单击时创建新的AlertDialog，并且该对话框具有自定义视图。但是，该自定义视图只有一个实例（您不会重新创建它）。因此，您尝试将相同的自定义视图v添加到不允许的多个对话框中。根据您的用例，我更改了代码并稍微重构了一下：

public class Activity_listview extends AppCompatActivity {

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

        final int decimal;

        ListView listView = (ListView) findViewById(R.id.listview);
        String list_setting[] = {"number of decimal format"};
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, android.R.id.text1, list_setting);
        listView.setAdapter(adapter);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                if (position == 0) {
                    final AlertDialog.Builder dialog = new AlertDialog.Builder(Activity_listview.this);

                    // inflating custom alert view
                    LayoutInflater inflater = getLayoutInflater();
                    final View v = inflater.inflate(R.layout.dialog_radiobutton, null);
                    final RadioGroup radioGroup_decimalformat = (RadioGroup) v.findViewById(R.id.radioGroup_decimalformat);

                    dialog.setView(v);
                    dialog.setTitle("Number of decimal format");
                    dialog.setPositiveButton("Done", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            // saving only on Done click
                            int checkedId = radioGroup_decimalformat.getCheckedRadioButtonId();

                            if (checkedId != -1)
                                modifyPreferenceOnCheck();
                            dialog.cancel();
                        }
                    });

                    dialog.show();      //here the error
                }
            }
        });
    }


    // method to save the preference values
    private void modifyPreferenceOnCheck(int checkedId) {
        final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
        final SharedPreferences.Editor editor = preferences.edit();

        switch (checkedId) {
            case R.id.radioButton_decimal1:
                editor.putInt("decimal_key", 1);
                break;
            case R.id.radioButton_decimal2:
                editor.putInt("decimal_key", 2);
                break;
            case R.id.radioButton_decimal3:
                editor.putInt("decimal_key", 3);
                break;
            case R.id.radioButton_decimal4:
                editor.putInt("decimal_key", 4);
                break;
            case R.id.radioButton_decimal5:
                editor.putInt("decimal_key", 5);
                break;
            case R.id.radioButton_decimal6:
                editor.putInt("decimal_key", 6);
                break;
            case R.id.radioButton_decimal7:
                editor.putInt("decimal_key", 7);
                break;
            case R.id.radioButton_decimal8:
                editor.putInt("decimal_key", 8);
                break;
            case R.id.radioButton_decimal9:
                editor.putInt("decimal_key", 9);
                break;
            case R.id.radioButton_decimal10:
                editor.putInt("decimal_key", 10);
                break;
            default:
                editor.putInt("decimal_key", 4);
        }

        editor.apply();
    }

}

如果您遇到任何问题，请告诉我。

Answer 2

试试这个：

dialog.setPositiveButton("Done", new DialogInterface.OnClickListener() {
     @Override
     public void onClick(DialogInterface dialog, int which) {
         ...
         dialog.dismiss();
     }
});
dialog.setCancelable(true);
dialog.show();

在android中第二次显示对话框时出错

2 个答案: