学习笔记，android:获取联系人列表，点击联系人打电话 用android.R.layout.simple_list_item_2形式

郭霖的第一行代码举了读取联系人的例子，前有打电话的例子，该结合在一起，点击联系人就好打电话。要响应点击单个联系人的事件。布局不改变，但是列表形式要改变：

android.R.layout.simple_list_item_2 或 android.R.layout.simple_expandable_list_item_2。

activity_main.xml

AndroidManifest.xml:

MainActivity.java:

package com.example.contactstest;import android.Manifest;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.AdapterView;import android.widget.ListView;import android.widget.SimpleAdapter;import android.widget.Toast;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class MainActivity extends AppCompatActivity {    private ListView listView;    private Map contact;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        if(ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS)                != PackageManager.PERMISSION_GRANTED){            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission            .READ_CONTACTS }, 1);        }        else {            readContacts();        }    }    private void readContacts(){        listView = (ListView)findViewById(R.id.contacts_view);        SimpleAdapter simpleAdapter;        List> listmaps=new ArrayList>();        Cursor cursor = null;        try {            cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.                    CONTENT_URI,null, null, null ,null);            if(cursor != null){                while (cursor.moveToNext()){                String dispalyName = cursor.getString(cursor.getColumnIndex(ContactsContract.                        CommonDataKinds.Phone.DISPLAY_NAME));                String number = cursor.getString(cursor.getColumnIndex(ContactsContract.                        CommonDataKinds.Phone.NUMBER));                    Map map=new HashMap();                    map.put("name", dispalyName);                    map.put("number", number);                    listmaps.add(map);                }                /*simpleAdapter=new SimpleAdapter(MainActivity.this, listmaps,                        android.R.layout.simple_list_item_2, new String[]{"name","number"},                        new int[]{android.R.id.text1,android.R.id.text2});*/                simpleAdapter=new SimpleAdapter(MainActivity.this, listmaps,                        android.R.layout.simple_expandable_list_item_2, new String[]{"name","number"},                        new int[]{android.R.id.text1,android.R.id.text2});                listView.setAdapter(simpleAdapter);                simpleAdapter.notifyDataSetChanged();                myCall(listmaps);            }                }            catch (Exception e){            e.printStackTrace();        }finally {            if(cursor != null){                cursor.close();            }        }     }    @Override    public void onRequestPermissionsResult(int requesCode, String[]  permissions,        int[] grantResults) {        switch (requesCode) {            case 1:                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){                    readContacts();                }                else {                    Toast.makeText(this, "You denied the permission.", Toast.LENGTH_LONG).show();                }                break;            case 2:                if(grantResults.length > 0 && grantResults[0] ==PackageManager.                        PERMISSION_GRANTED){                    callphone();                }                else {                    Toast.makeText(this, "You denied the permission.",Toast.LENGTH_LONG).show();                }                break;            default:        }    }    public void myCall(final List> mapList){                listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView parent, View view, int position, long id){                if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.                        CALL_PHONE) !=PackageManager.PERMISSION_GRANTED){                    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.                            permission.CALL_PHONE},2);                }                else {                          Map mMap=mapList.get(position);                          contact =  mapList.get(position);                               String number = contact.get("number");                callphone();                }          }        });    }    private void callphone(){        try{            Intent intent = new Intent(Intent.ACTION_CALL);            String num = (String)contact.get("number");            intent.setData(Uri.parse("tel:"+num));            startActivity(intent);        }catch (SecurityException e){            e.printStackTrace();        }    }}