一.輸入：

1.全部程式碼：

主介面程式碼：

public class BindServiceActivity extends AppCompatActivity implements View.OnClickListener {
    private static final String TAG = "BindServiceActivity";
    private Button mBtBindService;
    private Button mBtnUnbindService;
    MyBindService myBindService;
    boolean isBind=false;
    ServiceConnection coon = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
        //繫結服務的時候偶觸發
            Log.d(TAG, "onServiceConnected: ");
            MyBindService.MyBinder myBinder = (MyBindService.MyBinder) service;
            myBindService = myBinder.getService();
            isBind=true;
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.d(TAG, "onServiceDisconnected: ");
            //解綁的時候觸發
        }
    };
    private Button mBtGetData;

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

    private void initView() {
        mBtBindService = (Button) findViewById(R.id.bt_bind_service);
        mBtnUnbindService = (Button) findViewById(R.id.btn_unbind_service);

        mBtBindService.setOnClickListener(this);
        mBtnUnbindService.setOnClickListener(this);
        mBtGetData = (Button) findViewById(R.id.bt_get_data);
        mBtGetData.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.bt_bind_service:
                Intent intent = new Intent(BindServiceActivity.this, MyBindService.class);
                bindService(intent, coon, Context.BIND_AUTO_CREATE);
                break;
            case R.id.btn_unbind_service:
                if (isBind){
                    unbindService(coon);
                    isBind=false;
                }

                break;
            case R.id.bt_get_data:
                Toast.makeText(myBindService, "亂數為："+myBindService.getValues(), Toast.LENGTH_SHORT).show();
                break;
        }
    }
}

服務程式碼：

public class MyBindService extends Service {
    private static final String TAG = "MyBindService";
    private IBinder iBinder;
    private Random mRandom;

    public MyBindService() {
    }
    public class MyBinder extends Binder{
        MyBindService getService(){
            return MyBindService.this;
        }
    }
    @Override
    public IBinder onBind(Intent intent) {
        Log.d(TAG, "onBind: ");
        // TODO: Return the communication channel to the service.
//        throw new UnsupportedOperationException("Not yet implemented");
        return iBinder;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.d(TAG, "onCreate: ");
        iBinder = new MyBinder();
        mRandom = new Random();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d(TAG, "onDestroy: ");
    }

    @Override
    public boolean onUnbind(Intent intent) {
        Log.d(TAG, "onUnbind: ");
        return super.onUnbind(intent);
    }

    @Override
    public void onRebind(Intent intent) {
        super.onRebind(intent);
        Log.d(TAG, "onRebind: ");
    }
    public int getValues(){
        return mRandom.nextInt(100);
    }
}

宣告：

service
            android:name=".MyBindService"
            android:enabled="true"
            android:exported="true"></service>

xml程式碼

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".BindServiceActivity">


    <Button
        android:id="@+id/bt_bind_service"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="繫結服務"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btn_unbind_service"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:text="解綁服務"
        app:layout_constraintEnd_toEndOf="@+id/bt_bind_service"
        app:layout_constraintStart_toStartOf="@+id/bt_bind_service"
        app:layout_constraintTop_toBottomOf="@+id/bt_bind_service" />

    <Button
        android:id="@+id/bt_get_data"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:text="get data"
        app:layout_constraintEnd_toEndOf="@+id/btn_unbind_service"
        app:layout_constraintStart_toStartOf="@+id/btn_unbind_service"
        app:layout_constraintTop_toBottomOf="@+id/btn_unbind_service" />

</androidx.constraintlayout.widget.ConstraintLayout>

2.步驟：

1.建立繫結服務

1. 
2. 
   實現這些方法：onCreate，onBind，onUnbind,onDestroy
   這個方法中要返回一個IBinder
   
   我們建立一個類繼承自Binder（他實現介面是IBinder）

public class MyBinder extends Binder{
        MyBindService getService(){
            return MyBindService.this;//獲取自己
        }
    }

初始化我們建立的類，並設定為成員變數

@Override
    public void onCreate() {
        super.onCreate();
        Log.d(TAG, "onCreate: ");
        iBinder = new MyBinder();
        mRandom = new Random();
    }

private IBinder iBinder;

2. 繫結服務

Intent intent = new Intent(BindServiceActivity.this, MyBindService.class);
                bindService(intent, coon, Context.BIND_AUTO_CREATE);//繫結服務（引數：intent，繫結監聽，常數）

建立繫結監聽coon

/**
     * 服務繫結連線監聽
     */
    ServiceConnection coon = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {//繫結連線觸發
            Log.d(TAG, "onServiceConnected: ");
            MyBindService.MyBinder myBinder = (MyBindService.MyBinder) service;
            myBindService = myBinder.getService();
            isBind=true;
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {//繫結不連線觸發
            Log.d(TAG, "onServiceDisconnected: ");
        }
    };

3.取消服務：

if (isBind){//沒繫結的話取消會報錯
                    unbindService(coon);//取消服務
                    isBind=false;
                }

4.生命週期

流程圖

二.輸出：