Android入门之bindService的用法详解

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">
 
    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.DemoBindService"
        tools:targetApi="31">
        <service
            android:name=".SampleBindService"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action
                    android:name="org.mk.android.demo.SampleBindService"/>
            </intent-filter>
 
        </service>
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
 
            <meta-data
                android:name="android.app.lib_name"
                android:value="" />
        </activity>
    </application>
 
</manifest>

package org.mk.android.demo;
 
import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
 
public class SampleBindService extends Service {
    private final String TAG = "SimpleBindService";
    private int count;
    private boolean quit;
    private CountNumBinder countNumBinder = new CountNumBinder();
 
    public SampleBindService() {
    }
 
    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        Log.i(TAG, ">>>>>>onBind方法被调用");
        return countNumBinder;
    }
 
    //Service被关闭前回调
    @Override
    public void onDestroy() {
        super.onDestroy();
        this.quit = true;
        Log.i(TAG, ">>>>>>onDestroyed方法被调用!");
    }
 
    @Override
    public void onRebind(Intent intent) {
        Log.i(TAG, ">>>>>>onRebind方法被调用!");
        super.onRebind(intent);
    }
 
    //Service被创建时调用
    @Override
    public void onCreate() {
        Log.i(TAG, ">>>>>>onCreate方法被调用");
        super.onCreate();
        //创建一个线程动态地修改count的值
        new Thread() {
            public void run() {
                while (!quit) {
                    try {
                        Thread.sleep(1000);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    count++;
                }
            }
 
            ;
        }.start();
    }
 
    //Service断开连接时回调
    @Override
    public boolean onUnbind(Intent intent) {
        Log.i(TAG, ">>>>>>onUnbind方法被调用!");
        return true;
    }
 
    //Service被启动时调用
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i(TAG, ">>>>>>onStartCommand方法被调用");
        return super.onStartCommand(intent, flags, startId);
    }
 
 
    public class CountNumBinder extends Binder {
        public int getCount() {
            Log.i(TAG, ">>>>>>into long waiting");
 
            try {
                Thread.sleep(300000);
            } catch (Exception e) {
            }
 
            return -1;
        }
    }
}

package org.mk.android.demo;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.app.Service;
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.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
 
public class MainActivity extends AppCompatActivity {
    private final String TAG = "SimpleBindService";
    private Button buttonBindService;
    private Button buttonStopBinding;
    private Button buttonGetValueFromBinder;
    private Context ctx;
    private Intent intent;
    private SampleBindService.CountNumBinder countNumBinder;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        buttonBindService = (Button) findViewById(R.id.buttonBindService);
        buttonStopBinding = (Button) findViewById(R.id.buttonStopBinding);
        buttonGetValueFromBinder = (Button) findViewById(R.id.buttonGetValueFromBinder);
        ctx = MainActivity.this;
        intent = new Intent(ctx, SampleBindService.class);
        buttonBindService.setOnClickListener(new OnClickListener());
        buttonStopBinding.setOnClickListener(new OnClickListener());
        buttonGetValueFromBinder.setOnClickListener(new OnClickListener());
    }
 
    private ServiceConnection conn = new ServiceConnection() {
 
        //Activity与Service断开连接时回调该方法
        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.i(TAG, ">>>>>>Service DisConnected");
        }
 
        //Activity与Service连接成功时回调该方法
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.i(TAG, ">>>>>>Service Connected");
            countNumBinder = (SampleBindService.CountNumBinder) service;
        }
    };
 
    class OnClickListener implements View.OnClickListener {
        @Override
        public void onClick(View view) {
            Intent eIntent;
            switch (view.getId()) {
                case R.id.buttonBindService:
                    bindService(intent, conn, Service.BIND_AUTO_CREATE);
                    break;
                case R.id.buttonStopBinding:
                    unbindService(conn);
                    break;
                case R.id.buttonGetValueFromBinder:
                    Toast.makeText(getApplicationContext(), "Service的count" + "的值为:" + countNumBinder.getCount(), Toast.LENGTH_LONG).show();
                    break;
            }
        }
    }
}