Question

我想从联系人列表中获取联系人数量。我按照Stack Overflow的链接创建一个项目。但它没有用。

MainActivity.java如下：

package com.example.shiza.countcontacts;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
import android.database.Cursor;
import android.provider.ContactsContract;


public class MainActivity extends ActionBarActivity {

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


    }
    public void GetTheContact()
    {
        Cursor cursor =  getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);

        int count = cursor.getCount();
        CharSequence text = "Total number is" + count;
//               int count = 1;
        Toast.makeText(this,text, Toast.LENGTH_LONG).show();

    }

    @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);
    }
}

我是Android的新手。请帮帮我。

manifest.xml是：

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

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

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

</manifest>

Answer 1

以下是完整的代码，

package com.example.shiza.countcontacts;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
import android.database.Cursor;
import android.provider.ContactsContract;


public class MainActivity extends ActionBarActivity {

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


    }
    public void GetTheContact()
    {
        Cursor cursor =  getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
        cursor.moveToNext();

        int count = cursor.getCount();
        CharSequence text = "Total number is" + count;
//               int count = 1;
        Toast.makeText(this,text, Toast.LENGTH_LONG).show();

    }

    @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);
    }
}

Answer 2

首先，您必须在AndroidManifest上声明权限

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

其次，您必须从手机访问联系人列表，并且只有在您获得列表的大小和每个联系人的数据后才能访问。

此链接将提供Google制作的示例。 http://developer.android.com/training/contacts-provider/retrieve-names.html

祝你好运。

从android联系人应用程序中获取联系人数量

2 个答案: