用Intent给Service传数据

对数通过intent传递，代码如下：

MainActivity

package com.example.zhangmeng.servicedemo;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    private EditText editText;
    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.button_StartService:
                Intent intent=new Intent(MainActivity.this,MyService.class);
                intent.putExtra("data",editText.getText().toString());
                startService(intent);
                break;
            case R.id.button_StopService:
                stopService(new Intent(MainActivity.this,MyService.class));

        }

    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.button_StartService).setOnClickListener(this);
        findViewById(R.id.button_StopService).setOnClickListener(this);
        editText=(EditText) findViewById(R.id.et);




    }
}

MyService.class

package com.example.zhangmeng.servicedemo;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
public class MyService extends Service {
    private boolean running=false;
    private String data="This is the data";

    @Override
    public void onCreate() {
        super.onCreate();
        running=true;
        new Thread(){
            @Override
            public void run() {
                super.run();
                while (running){
                    System.out.println(data);

                    try {
                        sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }

                }
            }
        }.start();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        data=intent.getStringExtra("data");
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        running=false;
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

}

MainActivity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.example.zhangmeng.servicedemo.MainActivity">

<EditText
    android:id="@+id/et"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="默认信息"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="启动服务"
        android:id="@+id/button_StartService" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="停止服务"
        android:id="@+id/button_StopService" />

</LinearLayout>