实现查询当前联系人应用中联系人的id和姓名

ゝ一纸荒年。 2022-08-19 13:08 184阅读 0赞

1、布局文件

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >
    
        <TextView
            android:id="@+id/result"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@android:color/black"
            android:textSize="25dp" />
    
    </LinearLayout>

2、MainActivity

public class MainActivity extends Activity {
    
    	private String[] columns = {Contacts._ID,//希望获得ID值
    			Contacts.DISPLAY_NAME};//希望获得姓名
    	
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            TextView tv = (TextView)findViewById(R.id.result);
            tv.setText(getQueryData());//为标签设置数据
        }
        private String getQueryData(){
        	StringBuilder sb = new StringBuilder();//用于保存字符串
        	ContentResolver resolver = getContentResolver();//获得ContentResolver对象
        	Cursor cursor = resolver.query(Contacts.CONTENT_URI, columns, null, null, null);//查询记录
        	int idIndex = cursor.getColumnIndex(columns[0]);//获得id记录的索引值
        	int displayNameIndex = cursor.getColumnIndex(columns[1]);//获得姓名记录的索引值
        	for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {// 迭代全部记录
                int id = cursor.getInt(idIndex);
                String displayName = cursor.getString(displayNameIndex);
                sb.append(id + ": " + displayName + "\n");
            }
        	cursor.close();//关闭Cursor
        	return sb.toString();//返回查询结果
        }
    }

3、在AndroidManifest文件中增加读取联系人记录的权限

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

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