在textview中显示listview的选定值

Question

我在活动中有一个列表视图和文本视图当我单击列表视图中的值时，所选项目将显示在文本视图中。 我附上了我的示例代码，请帮助我。

MainActivity.java
public class MainActivity extends Activity {
TextView txt_disp;
ListView lv;
String fruits[]={"Apple","Orange","Banana","Grapes","kiwi"};
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    txt_disp=(TextView)findViewById(R.id.textView1);
    lv=(ListView)findViewById(R.id.listView1);
     ArrayList<SamplePOJO> searchResults = GetSearchResults();
        CustomAdapter ea=new CustomAdapter(this, searchResults);
             lv.setAdapter(ea);
    // here i need to set the text(txt_display)  
}  }

CustomAdapter.java
 public View getView(final int position, View convertView, ViewGroup parent) {
    final ViewHolder holder;
    if (convertView == null) {
         convertView = mInflater.inflate(R.layout.row1, null);
        holder = new ViewHolder();
        holder.fruit=(TextView) convertView.findViewById(R.id.txt_fruit);
        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }
    holder.fruit.setText(ContactArrayList.get(position).getFruit());
    holder.fruit.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
            // TODO Auto-generated method stub
            String dis=holder.fruit.getText().toString();
            System.out.println("Selected Text:"+dis);
                 //Selected text value  set into textview in MainActivity 
    }
    });
    return convertView;
  }

Answer 1

在CustomAdapter中

，为它定义一个TextView字段和一个setter，然后在onCreate中将textField设置为你使用findviewbyid提取的文本字段

MainActivity.java
public class MainActivity extends Activity {
TextView txt_disp;
ListView lv;
String fruits[]={"Apple","Orange","Banana","Grapes","kiwi"};
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    txt_disp=(TextView)findViewById(R.id.textView1);
    lv=(ListView)findViewById(R.id.listView1);
     ArrayList<SamplePOJO> searchResults = GetSearchResults();
        CustomAdapter ea=new CustomAdapter(this, searchResults);
             lv.setAdapter(ea);
    // here i need to set the text(txt_display)
ea.setTextField(txt_disp);


}  }

CustomAdapter.java

TextView textView;

public void setTextField(TextView tv){textView = tv;}
enter code here
 public View getView(final int position, View convertView, ViewGroup parent) {
    final ViewHolder holder;
    if (convertView == null) {
         convertView = mInflater.inflate(R.layout.row1, null);
        holder = new ViewHolder();
        holder.fruit=(TextView) convertView.findViewById(R.id.txt_fruit);
        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }
    holder.fruit.setText(ContactArrayList.get(position).getFruit());
    holder.fruit.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
            // TODO Auto-generated method stub
            String dis=holder.fruit.getText().toString();
            System.out.println("Selected Text:"+dis);
                 //Selected text value  set into textview in MainActivity
            textView.setText("Selected Text:"+dis);
    }
    });
    return convertView;
  }

Answer 2

我认为您必须收听列表中的项目点击事件 您可以通过添加此代码段来实现此目的

lv.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {

        public void onItemClick(AdapterView<?> arg0, View view, int arg2,
                long arg3) {
            // set the value to the text view here
        }
    });

Answer 3

尝试：

@Override
 public void onClick(View v) {
    // TODO Auto-generated method stub
    String dis=holder.fruit.getText().toString();
    System.out.println("Selected Text:"+dis);

    MainActivity.this.txt_disp.setText(dis);
 }
});

编辑：

我没有注意到那些是单独的类。尝试在Activity中设置ListViev点击监听器您将获得所选项目和项目数组的位置。

lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {

    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        txt_disp.setText(fruits[position]);
    }
});

Answer 4

试试这个

lv.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
                txt_disp.setText(fruits[arg2]);
            }
        });