使用Contact实现从通讯录中获取数据

这个项目实现了从通讯录中获取联系人信息，也实现了将数据储存在数据库中，并对数据进行增删改查的操作

项目结构如图

 在进行获取通讯录信息之前要在AndroidManifest.xml文件中添加如下代码：

主活动布局如下：

xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:orientation="vertical"
android:layout_
tools:cOntext=".MainActivity">
android:id="@+id/ed_name"
android:layout_
android:hint="姓名"
android:layout_marginTop="25dp"
android:layout_/>
android:id="@+id/ed_phone"
android:layout_
android:hint="电话"
android:layout_marginTop="25dp"
android:layout_/>
android:layout_
android:layout_
android:layout_gravity="center"
android:layout_marginTop="25dp"
android:orientation="horizontal">
android:id="@+id/btn_add"
android:layout_marginRight="5dp"
android:layout_
android:layout_
android:text="添加"/>
android:id="@+id/btn_query"
android:layout_
android:layout_marginRight="5dp"
android:layout_
android:text="查询"/>
android:id="@+id/btn_update"
android:layout_
android:layout_
android:layout_marginRight="5dp"
android:text="修改"/>
android:id="@+id/btn_delete"
android:layout_
android:layout_marginRight="5dp"
android:layout_
android:text="删除"/>

android:id="@+id/btn_Contact"
android:layout_
android:layout_gravity="center"
android:layout_
android:text="获取通讯录联系人信息"/>
android:id="@+id/tv_show"
android:layout_
android:layout_/>

MainActivity.java：

package cn.itcast.tongxunludemo;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private EditText edName;
private EditText edPhone;
private TextView tvShow;
private Button btnAdd;
private Button btnQuery;
private Button btnUpdate;
private Button btnDelete;
private Button btnContact;
MyHelper myHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edName=findViewById(R.id.ed_name);
edPhOne=findViewById(R.id.ed_phone);
tvShow=findViewById(R.id.tv_show);
btnAdd=findViewById(R.id.btn_add);
btnQuery=findViewById(R.id.btn_query);
btnUpdate=findViewById(R.id.btn_update);
btnDelete=findViewById(R.id.btn_delete);
btnCOntact=findViewById(R.id.btn_Contact);
myHelper=new MyHelper(this);
btnAdd.setOnClickListener((View.OnClickListener) MainActivity.this);
btnQuery.setOnClickListener((View.OnClickListener) MainActivity.this);
btnUpdate.setOnClickListener((View.OnClickListener) MainActivity.this);
btnDelete.setOnClickListener((View.OnClickListener) MainActivity.this);
btnContact.setOnClickListener((View.OnClickListener) MainActivity.this);
}
@Override
public void onClick(View v) {
String name,phone;
SQLiteDatabase db;
ContentValues values;
switch (v.getId()){
case R.id.btn_add:
name=edName.getText().toString();
phOne=edPhone.getText().toString();
db=myHelper.getWritableDatabase();
String sqlSave="insert into information (name,phone) values(?,?)";
db.execSQL(sqlSave,new String[]{name,phone});
Toast.makeText(this,"信息已经添加",Toast.LENGTH_SHORT).show();
db.close();
break;
case R.id.btn_query:
db=myHelper.getReadableDatabase();
Cursor cursor=db.rawQuery("select * from information",null);
if(cursor.getCount()==0){
tvShow.setText("");
Toast.makeText(this,"没有数据",Toast.LENGTH_SHORT).show();
}else {
cursor.moveToFirst();
tvShow.setText("Name:"+cursor.getString(1)+";Tel:"+cursor.getString(2));
}
while (cursor.moveToNext()){
tvShow.append("\n"+"Name:"+cursor.getString(1)+";Tel:"+cursor.getString(2));
}
cursor.close();
db.close();
break;
case R.id.btn_update:
String nerName=edName.getText().toString();
String newPhoto=edPhone.getText().toString();
db=myHelper.getWritableDatabase();
String sqlUpdata="update information set phOne=? where name=?";
db.execSQL(sqlUpdata,new String[]{newPhoto,nerName});
Toast.makeText(this,"信息已经修改",Toast.LENGTH_SHORT).show();
db.close();
break;
case R.id.btn_delete:
db=myHelper.getWritableDatabase();
db.execSQL("delete from information");
Toast.makeText(this,"信息已经删除",Toast.LENGTH_SHORT).show();
tvShow.setText("");
db.close();
break;
case R.id.btn_Contact:
if(Build.VERSION.SDK_INT<23){
//获取联系人信息
getContacts();
}else {
if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_CONTACTS)!= PackageManager.PERMISSION_GRANTED){
//发起动态权限申请
ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.READ_CONTACTS},1);
}else {
//获取联系人
getContacts();
}
}
break;
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(requestCode==1 && permissions[0].equals(Manifest.permission.READ_CONTACTS)&& grantResults[0]==PackageManager.PERMISSION_GRANTED){
//获取联系人信息
getContacts();
}else {
Toast.makeText(MainActivity.this,"您拒绝了相关权限，无法获取联系人信息！",Toast.LENGTH_SHORT).show();
}
}
private void getContacts(){
tvShow.setText("");
Uri uri= ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
ContentResolver resolver=getContentResolver();
Cursor cursor=resolver.query(uri,null,null,null,null);
if(cursor !=null){
while (cursor.moveToNext()){
String name=cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
String phOne=cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
tvShow.append("\n姓名："+name+".电话："+phone);
}
}
}
class MyHelper extends SQLiteOpenHelper{
public MyHelper(Context context){
super(context,"itcast.db",null,1);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table information(_id integer primary key autoincrement,name varchar(20),phone varchar(20))");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
}

这样这个项目就完成了