Android ContentProvider实现获取手机联系人功能

package com.example.content;  import android.content.ContentResolver; import android.database.Cursor; import android.net.Uri; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View;  public class MainActivity extends AppCompatActivity {   private ContentResolver cr;   @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.activity_main);   //获取内容访问者   cr = getContentResolver();  }  public void getContacts(View view){   Uri uri=Uri.parse("content://com.android.contacts/raw_contacts");   Cursor cursor=cr.query(uri,null,null,null,null);   while(cursor.moveToNext()){    int _id=cursor.getInt(cursor.getColumnIndex("_id"));    String display_name=cursor.getString(cursor.getColumnIndex("display_name"));    Log.i("test",_id+" "+display_name);    Uri uriData=Uri.parse("content://com.android.contacts/raw_contacts/"+_id+"/data");    Cursor cursorData=cr.query(uriData,null,null,null,null);    while(cursorData.moveToNext()){     String mimetype=cursorData.getString(cursorData.getColumnIndex("mimetype"));     String data1=cursorData.getString(cursorData.getColumnIndex("data1"));     if("vnd.android.cursor.item/phone_v2".equals(mimetype)){      Log.i("test","  "+mimetype+" "+data1);     }    }   }  } }