08-Android 中 Service 通信

启动service并传输数据：

main_activity.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">


    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etData"
        android:text="默认信息"
        />

    <Button
        android:id="@+id/btnStartService"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="启动服务" />

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

</LinearLayout>

MyService.java:

package com.imooc.connectservice;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class MyService extends Service {
    private boolean running = false;
    private String data = "这是默认信息";

    public MyService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        data = intent.getStringExtra("data");
        return super.onStartCommand(intent, flags, startId);


    }

    @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 void onDestroy() {
        super.onDestroy();

        running = false;
    }
}

MainActivity.java:

package com.imooc.connectservice;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private EditText etData;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        etData = (EditText) findViewById(R.id.etData);

        findViewById(R.id.btnStartService).setOnClickListener(this);
        findViewById(R.id.btnStopService).setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.btnStartService:
                Intent i = new Intent(this,MyService.class);
                i.putExtra("data",etData.getText().toString());
                startService(i);
                break;
            case R.id.btnStopService:
                stopService(new Intent(this,MyService.class));

        }
    }
}

---

---

 绑定Service进行通信-上之执行服务的内部代码：

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <EditText
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:text="默认信息"
        android:id="@+id/etData"
        />

    <Button
        android:id="@+id/btnStartService"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="启动服务" />

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

    <Button
        android:id="@+id/btnBindService"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="绑定服务" />

    <Button
        android:id="@+id/btnUnBindService"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="解除绑定服务" />

    <Button
        android:id="@+id/btnSyncData"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="同步数据" />


</LinearLayout>

MyService.java:

package com.example.connectservice;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class MyService extends Service {
    private boolean running = false;
    private String data = "这是默认信息";

    public MyService() {
    }

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

    public class Binder extends android.os.Binder{

        public void setData(String data){
            MyService.this.data = data;
        }
    }


    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        data = intent.getStringExtra("data");

        return super.onStartCommand(intent, flags, startId);
    }

    @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 void onDestroy() {
        super.onDestroy();


        running = false;
    }
}

MainActivity.java:

package com.example.connectservice;

import androidx.appcompat.app.AppCompatActivity;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener, ServiceConnection {

    private EditText etData;
    private MyService.Binder binder = null;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        etData = (EditText) findViewById(R.id.etData);

        findViewById(R.id.btnStartService).setOnClickListener(this);
        findViewById(R.id.btnStopService).setOnClickListener(this);
        findViewById(R.id.btnBindService).setOnClickListener(this);
        findViewById(R.id.btnUnBindService).setOnClickListener(this);
        findViewById(R.id.btnSyncData).setOnClickListener(this);

    }

    @Override
    public void onClick(View view) {
            switch (view.getId()){

                case R.id.btnStartService:
                Intent i = new Intent(this,MyService.class);
                i.putExtra("data",etData.getText().toString());
                    startService(i);
                break;
                case R.id.btnStopService:
                    stopService(new Intent(this,MyService.class));
                break;
                case R.id.btnBindService:
                    bindService(new Intent(this,MyService.class),this, Context.BIND_AUTO_CREATE);
                    break;
                case R.id.btnUnBindService:
                    unbindService(this);
                    break;

                case R.id.btnSyncData:
                    if (binder!= null) {
                        binder.setData(etData.getText().toString());

                }
                    break;

        }
    }

    @Override
    public void onServiceConnected(ComponentName Name, IBinder service) {
        binder = (MyService.Binder) service;
    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {

    }
}

绑定service进行通信-下之增添服务的内部状态：

　　若程序内部代码发生改变如何通知外界代码

activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tvOut"
        />

    <EditText
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:text="默认信息"
        android:id="@+id/etData"
        />

    <Button
        android:id="@+id/btnStartService"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="启动服务" />

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

    <Button
        android:id="@+id/btnBindService"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="绑定服务" />

    <Button
        android:id="@+id/btnUnBindService"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="解除绑定服务" />

    <Button
        android:id="@+id/btnSyncData"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="同步数据" />


</LinearLayout>

MyService.java:

package com.example.connectservice;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class MyService extends Service {
    private boolean running = false;
    private String data = "这是默认信息";

    public MyService() {
    }

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

    public class Binder extends android.os.Binder{

        public void setData(String data){
            MyService.this.data = data;
        }
    }

        //3
        public MyService getService(){
            return MyService.this;
        }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        data = intent.getStringExtra("data");

        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onCreate() {
        super.onCreate();

        running = true;
        new Thread(){
            @Override
            public void run() {
                super.run();
                //3
                int i = 0;

                while (running){
                //3
                    i++;
                    String str = i+":"+data;
                    System.out.println(str);

                    if (callback!=null){
                        callback.onDataChange(str);
                    }



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

    @Override
    public void onDestroy() {
        super.onDestroy();


        running = false;
    }

    //3
    private Callback callback = null;

    public void setCallback(Callback callback) {
        this.callback = callback;
    }

    public Callback getCallback() {
        return callback;
    }

    //3
    public static interface Callback{
        void onDataChange(String data);
    }


}

MainActivity.java:

package com.example.connectservice;

import androidx.appcompat.app.AppCompatActivity;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener, ServiceConnection {

    private EditText etData;
    private MyService.Binder binder = null;
    //3
    private TextView tvOut;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        etData = (EditText) findViewById(R.id.etData);
        //3
        tvOut = (TextView) findViewById(R.id.tvOut);


        findViewById(R.id.btnStartService).setOnClickListener(this);
        findViewById(R.id.btnStopService).setOnClickListener(this);
        findViewById(R.id.btnBindService).setOnClickListener(this);
        findViewById(R.id.btnUnBindService).setOnClickListener(this);
        findViewById(R.id.btnSyncData).setOnClickListener(this);



    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){

            case R.id.btnStartService:
                Intent i = new Intent(this,MyService.class);
                i.putExtra("data",etData.getText().toString());
                startService(i);
                break;
            case R.id.btnStopService:
                stopService(new Intent(this,MyService.class));
                break;
            case R.id.btnBindService:
                bindService(new Intent(this,MyService.class),this, Context.BIND_AUTO_CREATE);
                break;
            case R.id.btnUnBindService:
                unbindService(this);
                break;

            case R.id.btnSyncData:
                if (binder!= null) {
                    binder.setData(etData.getText().toString());

                }
                break;

        }
    }

    @Override
    public void onServiceConnected(ComponentName Name, IBinder service) {
        binder = (MyService.Binder) service;
        //3
        binder.getService().setCallback(new MyService.Callback() {
            @Override
            public void onDataChange(String data) {
                Message msg = new Message();
                Bundle b = new Bundle();
                b.putString("data",data);
                msg.setData(b);
                handler.sendMessage(msg);

            }
        });
    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {

    }

    //3
    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            tvOut.setText(msg.getData().getString("data"));

        }
    };
}