跨程序共享数据，读取联系人信息

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

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

</LinearLayout>

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

    <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>
    <!-- 声明权限 -->
    <uses-permission android:name="android.permission.READ_CONTACTS" />

</manifest>

package demo.jq.com.contactstest;

import android.content.pm.PackageManager;
import android.database.Cursor;
import android.provider.ContactsContract;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;
import java.util.jar.Manifest;

/**
 * @author Jim
 */
public class MainActivity extends AppCompatActivity {

    /**
     * 定义adapter
     */
    ArrayAdapter<String> adapter;

    List<String> contactsList = new ArrayList<>();

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

        // 初始化ListView对象
        ListView contactsView = (ListView) findViewById(R.id.contacts_view);

        // 初始化adapter
        adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,contactsList);

        // 设置listview的适配内容
        contactsView.setAdapter(adapter);

        if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
            // 设置权限可读
            ActivityCompat.requestPermissions(this,new String[]{android.Manifest.permission.READ_CONTACTS},1);
        } else {
            // 读取联系人信息
            readContacts();
        }
    }

    private void readContacts() {
        Cursor cursor = null;
        try {
            // 查询联系人数据
            cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,null,null,null);
            if (cursor != null) {
                while (cursor.moveToNext()) {
                    // 获取联系人姓名
                    String displayName = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));

                    // 获取手机号
                    String number = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

                    contactsList.add(displayName + "\n" + number);
                }

                adapter.notifyDataSetChanged();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (cursor != null) {
                cursor.close();
            }
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, int[] grantResults) {
        switch (requestCode) {
            case 1:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    readContacts();
                } else {
                    Toast.makeText(this,"You denied the permission",Toast.LENGTH_SHORT).show();
                }
                break;
            default:

        }
    }


}



本文转自TBHacker博客园博客，原文链接：http://www.cnblogs.com/jiqing9006/p/7701066.html，如需转载请自行联系原作者