Android_system_调用系统联系人拨打电话

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

startActivityForResult(new Intent(Intent.ACTION_PICK, ContactsContract.Contacts.CONTENT_URI), 0);

if (resultCode == Activity.RESULT_OK) {
ContentResolver reContentResolverol = getContentResolver();
Uri contactData = data.getData();
@SuppressWarnings("deprecation")
Cursor cursor = managedQuery(contactData, null, null, null, null);
cursor.moveToFirst();
name = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
Cursor phone = reContentResolverol.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = " + contactId,
null,
null);
while (phone.moveToNext()) {
num = phone.getString(phone.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
}

et_name.setText(name);
et_num.setText(num);
}

Intent callIntent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + num));
startActivity(callIntent);

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp"
tools:context=".MainActivity"
android:orientation="vertical">

<EditText
android:id="@+id/et_name"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:hint="plaease input your name..."/>
<EditText
android:id="@+id/et_phone"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:hint="plaease input your phone num..."/>
<Button
android:id="@+id/btn_getContacts"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:hint="get num form system..."/>
<Button
android:id="@+id/btn_call"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:hint="call the num..."/>

</LinearLayout>

package com.example.ricky.android_system_getcontacts;

import android.app.Activity;
import android.content.ContentResolver;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {
private EditText et_name;
private EditText et_num;
private Button btn_getContacts;
private Button btn_calling;

private String name;
private String num;

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

et_name = (EditText)findViewById(R.id.et_name);
et_num = (EditText)findViewById(R.id.et_phone);
btn_getContacts = (Button) findViewById(R.id.btn_getContacts);
btn_calling = (Button) findViewById(R.id.btn_call);

btn_getContacts.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
startActivityForResult(new Intent(Intent.ACTION_PICK, ContactsContract.Contacts.CONTENT_URI), 0);
}
});

btn_calling.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
Intent callIntent = new Intent(Intent.ACTION_CALL, Uri
.parse("tel:" + num));
startActivity(callIntent);
}
});
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
ContentResolver reContentResolverol = getContentResolver();
Uri contactData = data.getData();
@SuppressWarnings("deprecation")
Cursor cursor = managedQuery(contactData, null, null, null, null);
cursor.moveToFirst();
name = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
Cursor phone = reContentResolverol.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = " + contactId,
null,
null);
while (phone.moveToNext()) {
num = phone.getString(phone.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
}

et_name.setText(name);
et_num.setText(num);
}
}
}