我有这个 fragment ，它显示了一个两列列表(使用适配器实现)。它代表一个电话号码列表，因此第二列只是一个号码列表:我想让每个号码都可单击，并且单击后，必须开始通话。这是我的代码:
MyFragment.java
public class MyFragment extends Fragment {
private ArrayList<HashMap<String, String>> list;
public static final String column1 = "column1";
public static final String column2 = "column2";
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_my, container, false);
ListView lview = (ListView)view.findViewById(R.id.listview);
populateList();
ListViewAdapter adapter = new ListViewAdapter(getActivity(), list);
lview.setAdapter(adapter);
return view;
}
public void onActivityCreated(Bundle savedInstanceState) {
final TextView tv = (TextView)getActivity().findViewById(R.id.column2);
tv.setOnClickListener(new View.OnClickListener() { **//this is the line getting NPE**
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_CALL);
String phone_no=tv.getText().toString().trim();
intent.setData(Uri.parse("tel:"+phone_no));
startActivity(intent);
}
});
super.onActivityCreated(savedInstanceState);
}
private void populateList() {
list = new ArrayList<HashMap<String, String>>();
HashMap<String, String> temp1 = new HashMap<String, String>();
temp1.put(column1,"Home");
temp1.put(column2, "55501982");
list.add(temp1);
}
}
fragment_my.xml
<?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"
android:orientation="vertical" >
<ListView
android:id="@+id/listview"
android:layout_height="wrap_content"
android:layout_width="match_parent">
</ListView>
</LinearLayout>
ListViewAdapter.java
public class ListViewAdapter extends BaseAdapter
{
public static final String colonna1 = "column1";
public static final String colonna2 = "column2";
public ArrayList<HashMap<String,String>> list;
Activity activity;
public ListViewAdapter(Activity activity, ArrayList<HashMap<String,String>> list) {
super();
this.activity = activity;
this.list = list;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
private class ViewHolder {
TextView txtFirst;
TextView txtSecond;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
LayoutInflater inflater = activity.getLayoutInflater();
if (convertView == null)
{
convertView = inflater.inflate(R.layout.rows, null);
holder = new ViewHolder();
holder.txtFirst = (TextView) convertView.findViewById(R.id.column1);
holder.txtSecond = (TextView) convertView.findViewById(R.id.column2);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder) convertView.getTag();
}
HashMap<String, String> map = list.get(position);
holder.txtFirst.setText(map.get(column1));
holder.txtSecond.setText(map.get(column2));
return convertView;
}
}
行.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:divider="?android:attr/dividerHorizontal"
android:orientation="horizontal"
android:paddingBottom="6dip"
android:paddingTop="4dip" >
<TextView
android:id="@+id/column1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="15dp"
android:layout_marginTop="5dp" />
<TextView
android:id="@+id/column2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:textColor="@drawable/color_number"
android:textSize="18sp"
android:textStyle="bold"
android:clickable="true" />
</LinearLayout>
我进行了两次尝试:首先，我在 MyFragment.java 中添加了以下代码:
final TextView tv = (TextView)getActivity().findViewById(R.id.column2);
tv.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_CALL);
String phone_no=tv.getText().toString().trim();
intent.setData(Uri.parse("tel:"+phone_no));
startActivity(intent);
}
});
但我收到 NullPointerException:
07-26 16:58:50.746: E/AndroidRuntime(3871): FATAL EXCEPTION: main
07-26 16:58:50.746: E/AndroidRuntime(3871): java.lang.NullPointerException
07-26 16:58:50.746: E/AndroidRuntime(3871): at com.example.myproject.fragments.MyFragment.onActivityCreated(MyFragment.java:44)
07-26 16:58:50.746: E/AndroidRuntime(3871): at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1508)
07-26 16:58:50.746: E/AndroidRuntime(3871): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:947)
07-26 16:58:50.746: E/AndroidRuntime(3871): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
07-26 16:58:50.746: E/AndroidRuntime(3871): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
07-26 16:58:50.746: E/AndroidRuntime(3871): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
07-26 16:58:50.746: E/AndroidRuntime(3871): at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:440)
07-26 16:58:50.746: E/AndroidRuntime(3871): at android.os.Handler.handleCallback(Handler.java:730)
07-26 16:58:50.746: E/AndroidRuntime(3871): at android.os.Handler.dispatchMessage(Handler.java:92)
07-26 16:58:50.746: E/AndroidRuntime(3871): at android.os.Looper.loop(Looper.java:137)
07-26 16:58:50.746: E/AndroidRuntime(3871): at android.app.ActivityThread.main(ActivityThread.java:5103)
07-26 16:58:50.746: E/AndroidRuntime(3871): at java.lang.reflect.Method.invokeNative(Native Method)
07-26 16:58:50.746: E/AndroidRuntime(3871): at java.lang.reflect.Method.invoke(Method.java:525)
07-26 16:58:50.746: E/AndroidRuntime(3871): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
07-26 16:58:50.746: E/AndroidRuntime(3871): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
07-26 16:58:50.746: E/AndroidRuntime(3871): at dalvik.system.NativeStart.main(Native Method)
然后，我尝试添加这一行:
android:autoLink="phone"
到 rows.xml，但单击时没有任何反应。有什么建议吗？
最佳答案
编辑:
ListView 可以有多个项目，因此您需要为其分配监听器的多个 TextView。但是，如果多个 View 具有相同的 id，您将如何在 Activity 中找到 View 呢？ :-) 这就是为什么您需要在扩展自定义项布局时在适配器内部设置监听器。像这样的事情:
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
LayoutInflater inflater = activity.getLayoutInflater();
if (convertView == null) {
convertView = inflater.inflate(R.layout.rows, null);
holder = new ViewHolder();
holder.txtFirst = (TextView) convertView.findViewById(R.id.column1);
holder.txtSecond = (TextView) convertView.findViewById(R.id.column2);
convertView.setTag(holder);
// Set the listener
holder.txtSecond.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_CALL);
String phone_no=tv.getText().toString().trim();
intent.setData(Uri.parse("tel:"+phone_no));
startActivity(intent);
}
});
} else {
holder = (ViewHolder) convertView.getTag();
}
HashMap<String, String> map = list.get(position);
holder.txtFirst.setText(map.get(column1));
holder.txtSecond.setText(map.get(column2));
return convertView;
}
请注意，我们仅在 View 膨胀时设置监听器。后来它就被重新使用。
关于java - 可点击的 TextView (电话通话 Intent )，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24972006/