Android开发入门之建立能与访问者进行相互通信的本地服务

StudentService

package cn.leigo.studentquery;import android.app.Service;import android.content.Intent;import android.os.Binder;import android.os.IBinder;public class StudentService extends Service {private StudentBinder binder = new StudentBinder();private String[] names = { "张三", "李四", "王五" };public String queryStudentByNo(int no) {if (no > 0 && no < 4) {return names[no - 1];}return null;}@Overridepublic IBinder onBind(Intent intent) {return binder;}private class StudentBinder extends Binder implements IStudent {@Overridepublic String queryStudent(int no) {return queryStudentByNo(no);}}}

<service android:name="cn.leigo.studentquery.StudentService" />

IStudent

package cn.leigo.studentquery;public interface IStudent {public String queryStudent(int no);}

MainActivity

package cn.leigo.studentquery;import android.app.Activity;import android.content.ComponentName;import android.content.Intent;import android.content.ServiceConnection;import android.os.Bundle;import android.os.IBinder;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class MainActivity extends Activity implements OnClickListener {private EditText mStudentNoEditText;private Button mQueryButton;private TextView mResultTextView;private StudentServiceConnection conn = new StudentServiceConnection();private IStudent iStudent;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mStudentNoEditText = (EditText) findViewById(R.id.et_student_no);mQueryButton = (Button) findViewById(R.id.btn_query);mResultTextView = (TextView) findViewById(R.id.tv_result);mQueryButton.setOnClickListener(this);Intent service = new Intent(this, StudentService.class);bindService(service, conn, BIND_AUTO_CREATE);}@Overrideprotected void onDestroy() {super.onDestroy();unbindService(conn);}private class StudentServiceConnection implements ServiceConnection {@Overridepublic void onServiceConnected(ComponentName name, IBinder service) {iStudent = (IStudent) service;}@Overridepublic void onServiceDisconnected(ComponentName name) {iStudent = null;}}@Overridepublic void onClick(View v) {String no = mStudentNoEditText.getText().toString();String name = iStudent.queryStudent(Integer.parseInt(no));mResultTextView.setText(name);}}