Question

我一直在android studio中进行编码，在1个活动中有2个微调器。当我选择一个Item时，即使微调器有不同的变量，它也不会调用Listener。

以下是从数据库填充微调器以及选择值的相关代码（在loadSYData函数中）

public void loadQtrData() {
    Cursor cursor = myDb.getQtr();
    ArrayList<String> qtrLabel = new ArrayList<>();
    ArrayAdapter<String> qtrAdapter = new ArrayAdapter<String>(this, R.layout.spinner_item, qtrLabel);
    qtrAdapter.setDropDownViewResource(R.layout.spinner_item);
    spinnerQtrParent.setAdapter(qtrAdapter);
    while(cursor.moveToNext()){
        String label = cursor.getString(cursor.getColumnIndex("SC_Quarter"));
        qtrLabel.add(label);
    }
}

public void loadSYData(){
    Cursor cursor = myDb.getSY();
    ArrayList<String> syLabel = new ArrayList<>();
    ArrayAdapter<String> syAdapter = new ArrayAdapter<String>(this, R.layout.spinner_item, syLabel);
    syAdapter.setDropDownViewResource(R.layout.spinner_item);
    spinnerSYParent.setAdapter(syAdapter);
    while(cursor.moveToNext()){
        String label = cursor.getString(cursor.getColumnIndex("SY"));
        syLabel.add(label);
    }
    spinnerSYParent.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            sy = "Success";
        }

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

        }
    });
}

我还举行了一场祝酒会，只是为了检查听众是否被调用。但是吐司程序没有执行。

Answer 1

可能是您的光标没有数据或者它没有移动到第一个位置检查此代码并查看您的微调器事件设置与否的天气。

    public void loadSYData(){
        Cursor cursor = myDb.getSY();
        ArrayList<String> syLabel = new ArrayList<>();
        ArrayAdapter<String> syAdapter = new ArrayAdapter<String>(this, R.layout.spinner_item, syLabel);
        syAdapter.setDropDownViewResource(R.layout.spinner_item);
        spinnerSYParent.setAdapter(syAdapter);
        // add this line to move cursor to 1st position.
        cursor.moveToFirst();
        while(cursor.moveToNext()){
            String label = cursor.getString(cursor.getColumnIndex("SY"));
            syLabel.add(label);
        }
        // Put debug point or print some thing here to confirm
        spinnerSYParent.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                sy = "Success";
            }

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

            }
        });
    }

Spinner OnItemSelectedListener在1个活动中与2个微调器无法正常工作

1 个答案: