讀取手機的聯系人

1. MainActivity類

package com.example.edu.contactstest;

import android.app.Activity;
import android.database.Cursor;
import android.provider.ContactsContract;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends Activity {
   ListView contentsView;
    ArrayAdapter<String> adapter;
    List<String> contentList=new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        contentsView=(ListView) findViewById(R.id.contents_view);
        adapter=new ArrayAdapter<>(this,android.R.layout.simple_list_item_1
        ,contentList);
        contentsView.setAdapter(adapter);
        readContacts();
    }

    public void readContacts() {
        Cursor cursor=null;
        try{

            cursor=getContentResolver().query(
                    ContactsContract.CommonDataKinds.Phone.CONTENT_URI
                    ,null,null,null,null);
            Log.i("tag",cursor.toString()+"============================");
            while(cursor.moveToNext()){
            String displayname=cursor.getString(cursor.getColumnIndex(
                    ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME
            ));
                String number=cursor.getString(cursor.getColumnIndex(
                        ContactsContract.CommonDataKinds.Phone.NUMBER
                ));
                contentList.add(displayname+"\n"+number);
                Log.i("TAG", "readContacts: "+displayname+number);
            }

        }catch (Exception e){

     e.printStackTrace();
        }finally {
            if(cursor!=null)
            cursor.close();
        }
    }
}
           

2.manifests清單檔案

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.edu.contactstest">
    <uses-permission android:name="android.permission.READ_CONTACTS"/>
    <uses-permission android:name="android.permission.WRITE_CONTACTS"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        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>
           

3 .activity_main.xml檔案

<?xml version="1.0" encoding="utf-8"?>
<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:orientation="vertical"
    >

    <ListView
        android:id="@+id/contents_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </ListView>
</LinearLayout>
           

4.注意事項： 我的是android studio2.0 sdk是6.0的。不要用goole自帶的模拟器運作，會出現錯誤，但是我在我的真實手機上可以運作讀取我手機上的聯系人資訊

- :: -/system_process E/KernelUidCpuTimeReader: failed to remove uid from uid_cputime module
                                                                      java.io.FileNotFoundException: /proc/uid_cputime/remove_uid_range: open failed: ENOENT (No such file or directory)
                                                                          at libcore.io.IoBridge.open(IoBridge.java:)
                                                                          at java.io.FileOutputStream.<init>(FileOutputStream.java:)
                                                                          at java.io.FileOutputStream.<init>(FileOutputStream.java:)
                                                                          at java.io.FileWriter.<init>(FileWriter.java:)
                                                                          at com.android.internal.os.KernelUidCpuTimeReader.removeUid(KernelUidCpuTimeReader.java:)
                                                                          at com.android.internal.os.BatteryStatsImpl.removeUidStatsLocked(BatteryStatsImpl.java:)
                                                                          at com.android.server.am.BatteryStatsService.removeUid(BatteryStatsService.java:)
                                                                          at com.android.server.am.ActivityManagerService.broadcastIntentLocked(ActivityManagerService.java:)
                                                                          at com.android.server.am.ActivityManagerService.broadcastIntent(ActivityManagerService.java:)
                                                                          at com.android.server.pm.PackageManagerService$8.run(PackageManagerService.java:)
                                                                          at android.os.Handler.handleCallback(Handler.java:)
                                                                          at android.os.Handler.dispatchMessage(Handler.java:)
                                                                          at android.os.Looper.loop(Looper.java:)
                                                                          at android.os.HandlerThread.run(HandlerThread.java:)
                                                                          at com.android.server.ServiceThread.run(ServiceThread.java:)
                                                                       Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
                                                                          at libcore.io.Posix.open(Native Method)
                                                                          at libcore.io.BlockGuardOs.open(BlockGuardOs.java:)
                                                                          at libcore.io.IoBridge.open(IoBridge.java:)
                                                                          at java.io.FileOutputStream.<init>(FileOutputStream.java:)?
                                                                          at java.io.FileOutputStream.<init>(FileOutputStream.java:)?
                                                                          at java.io.FileWriter.<init>(FileWriter.java:)?
                                                                          at com.android.internal.os.KernelUidCpuTimeReader.removeUid(KernelUidCpuTimeReader.java:)?
                                                                          at com.android.internal.os.BatteryStatsImpl.removeUidStatsLocked(BatteryStatsImpl.java:)?
                                                                          at com.android.server.am.BatteryStatsService.removeUid(BatteryStatsService.java:)?
                                                                          at com.android.server.am.ActivityManagerService.broadcastIntentLocked(ActivityManagerService.java:)?
                                                                          at com.android.server.am.ActivityManagerService.broadcastIntent(ActivityManagerService.java:)?
                                                                          at com.android.server.pm.PackageManagerService$8.run(PackageManagerService.java:)?
                                                                          at android.os.Handler.handleCallback(Handler.java:)?
                                                                          at android.os.Handler.dispatchMessage(Handler.java:)?
                                                                          at android.os.Looper.loop(Looper.java:)?
                                                                          at android.os.HandlerThread.run(HandlerThread.java:)?
                                                                          at com.android.server.ServiceThread.run(ServiceThread.java:)?
- :: -/com.android.systemui I/art: Background partial concurrent mark sweep GC freed (KB) AllocSpace objects, (B) LOS objects, % free, MB/MB, paused ms total ms