ConstraintLayout无法转换为android.widget.TextView [英] ConstraintLayout cannot be cast to android.widget.TextView
问题描述
尝试启动活动时,我总是收到运行时错误.
I keep getting a runtime error when I try to launch an activity.
发生错误的行:
private OnItemClickListener mDeviceClickListener = new OnItemClickListener() {
public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) {
textView1.setText("Csatlakozás...");
String info = ((TextView) v).getText().toString(); // <-- ERROR HERE
String address = info.substring(info.length() - 17);
Intent i = new Intent(DeviceListActivity.this, MainActivity.class);
i.putExtra(EXTRA_DEVICE_ADDRESS, address);
startActivity(i);
}
};
Logcat:
java.lang.ClassCastException:android.support.constraint.ConstraintLayout无法强制转换为android.widget.TextView在arduinosensors.example.com.smarthome3.DeviceListActivity $ 1.onItemClick(DeviceListActivity.java:106)
java.lang.ClassCastException: android.support.constraint.ConstraintLayout cannot be cast to android.widget.TextView at arduinosensors.example.com.smarthome3.DeviceListActivity$1.onItemClick(DeviceListActivity.java:106)
这是怎么回事?直到我开始在自定义行布局中使用自定义数组适配器之前,一切都很好.
What is happening here? It was fine until I started to use a custom array adapter with custom row layout.
custom_row.xml
custom_row.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="TextView"
android:textSize="18sp"
android:textStyle="bold" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="TextView"
android:textSize="18sp" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
我的适配器:
public class UsersAdapter extends ArrayAdapter<Adapter> {
public UsersAdapter(Context context, ArrayList<Adapter> users) {
super(context, 0, users);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Adapter user = getItem(position);
if (convertView == null) {
LayoutInflater sontInflater = LayoutInflater.from(getContext());
convertView = sontInflater.inflate(R.layout.custom_row,parent,false);
}
TextView one = (TextView) convertView.findViewById(R.id.textView);
TextView two = (TextView) convertView.findViewById(R.id.textView2);
one.setText(user.name);
two.setText(user.hometown);
return convertView;
}
}