使用我的应用程序时出现此错误:
05-01 14:18:41.000: E/AndroidRuntime(26607): FATAL EXCEPTION: main
05-01 14:18:41.000: E/AndroidRuntime(26607): java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.TextView
有问题的方法:
public void onItemClick(AdapterView<?> adapterView, View view, int postion,
long index) {
// Get MAC adress matching the last 17 characters of the TextView
String info = ((TextView) view).getText().toString(); // HERE IS THE ISSUE
String address = info.substring(info.length() - 17);
Intent intent = new Intent();
intent.putExtra(EXTRA_DEVICE_ADDRESS, address);
setResult(Activity.RESULT_OK, intent);
BluetoothDevice device = (BluetoothDevice) view.getTag();
showEquipementActivity(device);
}
和 XML 文件:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ImageView
android:id="@+id/ImageView_tactea"
android:layout_width="200dp"
android:layout_height="75dp"
android:src="@drawable/tactea"
android:layout_gravity="center"
android:visibility="visible" />
<LinearLayout
android:id="@+id/linearLayout2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="5dip" >
<TextView
android:id="@+id/textView1"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/label_list_of_devices"
android:textSize="17dip"
android:textStyle="bold" />
<Button
android:id="@+id/buttonScan"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/label_scan" />
</LinearLayout>
<ListView
android:id="@+id/listViewDevices"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1" >
</ListView>
</LinearLayout>
此 XML 文件用于显示找到的配对蓝牙设备和新闻设备。
你能帮助我吗 ?
如何更改这些行?
String info = ((TextView) view).getText().toString(); // HERE IS THE ISSUE
String address = info.substring(info.length() - 17);
更新:我收到以下错误:
05-01 14:39:33.150: E/AndroidRuntime(7160): FATAL EXCEPTION: main
05-01 14:39:33.150: E/AndroidRuntime(7160): java.lang.NullPointerException
05-01 14:39:33.150: E/AndroidRuntime(7160): at com.example.cajou.DiscoverDevicesActivity.onItemClick(DiscoverDevicesActivity.java:179)
05-01 14:39:33.150: E/AndroidRuntime(7160): at android.widget.AdapterView.performItemClick(AdapterView.java:301)
05-01 14:39:33.150: E/AndroidRuntime(7160): at android.widget.AbsListView.performItemClick(AbsListView.java:1276)
更新 2:
我试过了 :
TextView textview=(TextView) ((LinearLayout)view).findViewById(R.id.textView1);
String info = textview.getText().toString();
但我对这条线有疑问:
String info = textview.getText().toString();
更新 3:
我试过了 :
LinearLayout ll = (LinearLayout) view;
TextView tv = (TextView) ll.findViewById(R.id.textView1);
final String info = tv.getText().toString();
但同样的问题......这条线是问题:
final String info = tv.getText().toString();