android - 如何通过单击获取列表项名称?
问题描述
我编写了一个程序来检索 android 设备中所有保存的联系人。代码工作正常,但现在我想通过单击列表项来获取联系人姓名和号码。为此,我使用了自定义列表视图(包括图像视图、2 个文本视图和一个复选框)。
我编写了“setOnItemClickListner”方法来获取联系人姓名,但是当我单击任何列表项时,它不会显示 toast 消息(显示联系人姓名)。如何解决这个问题?
这是主要活动
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
ListView list;
public String contactName;
public String contactNumber;
public String name;
public String number;
// array list
ArrayList<Contact> contactList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
list = (ListView)findViewById(R.id.listContact);
fetchContact(); // call fetch contact method
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void fetchContact(){
Uri uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
String[] projection = {ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
ContactsContract.CommonDataKinds.Phone.NUMBER};
String selection = null;
String[] selectionArgs = null;
String sortOrder = null;
ContentResolver resolver = getContentResolver();
Cursor cursor = resolver.query(uri,projection,selection,selectionArgs,sortOrder);
while(cursor.moveToNext()){
contactName = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
contactNumber = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
// object for contact class
Contact contact = new Contact(contactName,contactNumber);
// add contact object to array list
contactList.add(contact);
}
sortList(); // call sort list method
// setting custome adapter
contactAdapter adapter = new contactAdapter(MainActivity.this,R.layout.activity_list_item,contactList);
list.setAdapter(adapter);
// list item click listner
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
/* contactName = contactList.get(i).getName();
contactNumber = contactList.get(i).getNumber();*/
name = adapterView.getItemAtPosition(i).toString();
number = adapterView.getItemAtPosition(i).toString();
Toast.makeText(MainActivity.this, "Contact Name : " + name + "\n"+ "Contact Number : " + number, Toast.LENGTH_SHORT).show();
}
});
}
private void sortList(){
// sort array list
Collections.sort(contactList, new Comparator<Contact>() {
@Override
public int compare(Contact contact, Contact t1) {
return contact.getName().compareTo(t1.getName());
}
});
}
}
This the contact class
public class Contact {
// properties
public String name;
public String number;
// constructor
public Contact(String name, String number) {
this.name = name;
this.number = number;
}
public Contact() {
}
// getter and setter
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getNumber() {
return number;
}
public void setNumber(String number) {
this.number = number;
}
}
This is the custome layout I build
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ContactInfoActivity"
android:background="@android:color/white">
<!--Banner-->
<ImageView
android:id="@+id/imgBanner"
android:layout_width="match_parent"
android:layout_height="200dp"
android:background="#199FD5"/>
<!--Circle image-->
<de.hdodenhof.circleimageview.CircleImageView
android:id="@+id/imgPerson"
android:layout_width="75dp"
android:layout_height="75dp"
android:layout_marginTop="-35dp"
android:layout_centerHorizontal="true"
android:layout_below="@+id/imgBanner"
android:src="@drawable/person"/>
<!--Contact name & number-->
<TextView
android:id="@+id/txtName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Contact Name"
android:textStyle="bold"
android:textSize="20sp"
android:layout_below="@+id/imgPerson"
android:layout_marginTop="15dp"
android:textAlignment="center"/>
<TextView
android:id="@+id/txtNumber"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Contact Number"
android:textStyle="bold"
android:textSize="22sp"
android:layout_below="@+id/txtName"
android:layout_marginTop="15dp"
android:textAlignment="center"/>
<!--Image-->
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_below="@+id/txtNumber"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp">
<ImageButton
android:layout_width="50dp"
android:layout_height="50dp"
android:background="@android:color/white"
android:src="@drawable/ic_call"
android:layout_marginLeft="20dp"/>
<ImageButton
android:layout_width="50dp"
android:layout_height="50dp"
android:background="@android:color/white"
android:src="@drawable/ic_message"
android:layout_marginLeft="20dp"/>
<ImageButton
android:layout_width="50dp"
android:layout_height="50dp"
android:background="@android:color/white"
android:src="@drawable/ic_email"
android:layout_marginLeft="20dp"/>
<ImageButton
android:layout_width="50dp"
android:layout_height="50dp"
android:background="@android:color/white"
android:src="@drawable/ic_share"
android:layout_marginLeft="20dp"/>
</LinearLayout>
</RelativeLayout>
This is the custom adapter (contact adapter)
package com.example.contact4;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.ArrayList;
public class contactAdapter extends ArrayAdapter<Contact> {
private static final String TAG = "contactAdapter";
private Context mContext;
int mResource;
// constructor
public contactAdapter (Context context, int resource, ArrayList<Contact> object)
{
super(context,resource,object);
mContext = context;
mResource = resource;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// get the contact information
String name = getItem(position).getName();
String number = getItem(position).getNumber();
// create the contact object with the information
Contact contact = new Contact(name,number);
LayoutInflater inflater = LayoutInflater.from(mContext);
convertView = inflater.inflate(mResource,parent,false);
TextView tvName = (TextView)convertView.findViewById(R.id.txtName);
TextView tvNumber= (TextView)convertView.findViewById(R.id.txtNumber);
tvName.setText(name);
tvNumber.setText(number);
return convertView;
}`enter code here`
}
解决方案
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