android - "android.widget.LinearLayout"无法在 ListView onItemClick 中转换为 "android.widget.TextView"

Question

我正在尝试将 ListView 中的选定值放入 Toast。

listView1.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> a, View v, int pos, long id){
          // Now you have the id, you can set the background colour.
         Toast.makeText(getBaseContext(),((TextView)v).getText(), Toast.LENGTH_LONG).show();
    }
});

我得到的错误:

Error: android.widget.LinearLayout cannot be cast to android.widget.TextView

Answer 1

如果您的 ListView 行布局不只包含一个 TextView，您将得到该异常(TextView 不能被包装使用 LinearLayout 或其他东西)。相反，您可以这样做:

public void onItemClick(AdapterView<?> a, View v, int pos, long id){
    LinearLayout parent = (LinearLayout) v;
    TextView t = (TextView) parent.findViewById(R.id.the_id_of_the_textview);
    Toast.makeText(getBaseContext(), t.getText(), Toast.LENGTH_LONG).show();
}