Question

我正在尝试打印listView中单击的值，但后来我遇到以下异常：

07-04 10:40:56.482: E/AndroidRuntime(1356): FATAL EXCEPTION: main
07-04 10:40:56.482: E/AndroidRuntime(1356): java.lang.ClassCastException:      android.widget.LinearLayout cannot be cast to android.widget.TextView
07-04 10:40:56.482: E/AndroidRuntime(1356):     at com.passwordkeeper.ui.ActivityHomeScreen$1.onItemClick(ActivityHomeScreen.java:88)

以下是代码段：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mTextView = (TextView) findViewById(R.id.labelList);
    db = new DatabaseHandler(this);
    createList();
    displayList();
}

createList函数正常运行。这是我的displayList方法：

public void displayList(){
    this.setListAdapter(new ArrayAdapter<String>(this, R.layout.activity_home_screen, R.id.listTextView, mAccountNames));
    mListView = getListView();
    mListView.setOnItemClickListener(new OnItemClickListener(){
        public void onItemClick(AdapterView<?> parent, View view, int position,
                long id) {
            String product = ((TextView) view).getText().toString();
            Log.v("mSelectedProduct", product);
        }           
    });
}

我的文件activity_home_screen.xml的xml代码是：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
    android:id="@+id/listTextView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="28dp"
    android:layout_marginTop="26dp"
    android:textAppearance="?android:attr/textAppearanceLarge" />

任何帮助都会有用！

谢谢。

Answer 1

你可以试试这个

mListView.setOnItemClickListener(new OnItemClickListener(){
        public void onItemClick(AdapterView<?> parent, View view, int position,
                long id) {
            TextView txtview = (TextView)view.findViewById(R.id.listTextView);
            String product = txtview.getText().toString();
            Log.v("mSelectedProduct", product);
        }           
    });

Answer 2

使用此：

String product = ((TextView) view.findViewById(R.id.listTextView)).getText().toString();

Answer 3

您在OnItemClickListener中获取的视图将返回父布局，即您的情况下的LinearLayout。

您可以通过以下方式获取文本视图：

mListView.setOnItemClickListener(new OnItemClickListener(){
        public void onItemClick(AdapterView<?> parent, View view, int position,
                long id) {
            TextView txtview = (TextView)view.findViewById(R.id.listTextView);
            String product = txtview.getText().toString();
            Log.v("mSelectedProduct", product);
        }           
    });

Answer 4

mListView.setOnItemClickListener(new OnItemClickListener(){
        public void onItemClick(AdapterView<?> parent, View view, int position,
                long id) {
            TextView textview= (TextView)view.findViewById(R.id.TEXTVIEW_ID);
            String product = textView.getText().toString();
            Log.v("mSelectedProduct", product);
        }           
    });

将“TEXTVIEW_ID”替换为您在列表视图项xml中给出的textview的id（如果没有给出，请给出一个）。

Android java.lang.ClassCastException：android.widget.LinearLayout无法强制转换为android.widget.TextView

4 个答案: