<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cn.netkiller.contacts">

    <uses-permission android:name="android.permission.READ_CONTACTS"/>
    <uses-permission android:name="android.permission.CALL_PHONE"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>  		
		
		

		
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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=".MainActivity">

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="通信錄與撥打電話"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/contact"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="60dp"
        android:layout_marginEnd="8dp"
        android:text="聯繫人"
        app:layout_constraintEnd_toStartOf="@+id/call"
        app:layout_constraintHorizontal_bias="0.478"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/phone" />

    <EditText
        android:id="@+id/phone"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="64dp"
        android:layout_marginEnd="8dp"
        android:ems="10"
        android:inputType="phone"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.475"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView2" />

    <Button
        android:id="@+id/call"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="60dp"
        android:layout_marginEnd="52dp"
        android:text="Call"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/phone" />

</android.support.constraint.ConstraintLayout>		
		
		

		
package cn.netkiller.contacts;

import android.app.Activity;
import android.content.ContentResolver;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.provider.ContactsContract;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
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 phone;
    private Button contact;
    private Button call;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        contact = (Button) findViewById(R.id.contact);
        contact.setOnClickListener(this);

        call = (Button) findViewById(R.id.call);
        call.setOnClickListener(this);

        phone = (EditText) findViewById(R.id.phone);
        phone.setText("", TextView.BufferType.EDITABLE);


        if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions((Activity) this, new String[]{android.Manifest.permission.READ_CONTACTS}, 1);
        }
        if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions((Activity) this, new String[]{android.Manifest.permission.CALL_PHONE}, 1);
        }


    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.contact:
                Toast.makeText(MainActivity.this, "獲取聯繫人手機號碼", Toast.LENGTH_SHORT).show();
                startActivityForResult(new Intent(Intent.ACTION_PICK, ContactsContract.Contacts.CONTENT_URI), 0);
                break;
            case R.id.call:
                Toast.makeText(MainActivity.this, "打電話", Toast.LENGTH_SHORT).show();

                Intent intent = new Intent();
                intent.setAction(Intent.ACTION_CALL);//ACTION_DIAL
                intent.setData(Uri.parse("tel:" + phone.getText()));
                startActivity(intent);

                break;
        }

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == Activity.RESULT_OK) {
            Uri contactData = data.getData();
            Cursor cursor = getContentResolver().query(contactData, null, null, null, null);
            cursor.moveToFirst();

            //條件為聯繫人ID
            String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
            //獲得DATA表中的電話號碼，條件為聯繫人ID,因為手機號碼可能會有多個
            Cursor contact = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=" + contactId, null, null);
            while (contact.moveToNext()) {
                String contactNumber = contact.getString(contact.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

                phone.setText(contactNumber);
            }
            cursor.close();

        }
    }

}