自动完成文本视图的选定项目显示为简单的Textview？

Question

我正在使用自动完成文本视图,它显示了数据库中的一些名称.我想在textview中显示一个名称,我从自动完成textview中选择了一个名称.这是我的代码:

ArrayList<String> s1 = new ArrayList<String>();

      for (StudentInfo cn : studentInfo) {
            s1.add(cn.getName());
        }
        ArrayAdapter<String> adapter =  new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line,s1); 
       a1.setThreshold(1); 
        a1.setAdapter(adapter);

---

a1.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
    }
        });

Answer 1

试试这种方式:

AutoCompleteTextView a1 = (AutoCompleteTextView) findViewById(...);

StudentInfo[] s1 = studentInfo.toArray(new StudentInfo[studentInfo.size()]);

ArrayAdapter<StudentInfo> adapter = new ArrayAdapter<StudentInfo>(this, android.R.layout.simple_dropdown_item_1line, s1);
a1.setAdapter(adapter);
a1.setOnItemClickListener(new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> parent, View arg1, int position, long arg3) {
        Object item = parent.getItemAtPosition(position);
        if (item instanceof StudentInfo){
        StudentInfo student=(StudentInfo) item;
            doSomethingWith(student);
        }
    }
});

ArrayAdapter使用StudentInfo的toString()方法生成显示的文本,因此您需要实现一个很好的toString方法.

这样,这种实现可以适应任何对象类型.

顺便说一句:我更喜欢android.R.layout.simple_spinner_dropdown_item而不是android.R.layout.simple_dropdown_item_1line

Answer 2

感谢斯蒂芬·里希特！我想补充一点，List<T>在构造适配器时可以直接使用：

AutoCompleteTextView autoCompleteTextView = dialogView.findViewById(R.id.autoComplete);
            // Where mStudentsInfo is List<StudentInfo>
            ArrayAdapter<StudentInfo> adapter = new ArrayAdapter<>(this, android.R.layout.simple_dropdown_item_1line, mStudentsInfo);
            autoCompleteTextView.setAdapter(adapter);
            autoCompleteTextView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    Object item = parent.getItemAtPosition(position);
                    if (item instanceof StudentInfo) {
                        StudentInfo studentInfo = (StudentInfo) item;
                        // do something with the studentInfo object
                    }
                }
            });

并且也不要忘记重写以下toString()方法StudentInfo.class：

public class StudentInfo {

....

    @Override
    public String toString() {
        return studentName;
    }
}

Answer 3

你的s1包含所有的名字database

a1.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int position,
                    long arg3) {
            Log.d("your selected item",""+s1.get(position));
            //s1.get(position) is name selected from autocompletetextview
            // now you can show the value on textview. 
    }
        });

希望这对你有帮助，