BindService使用方法：

最新推荐文章于 2025-05-30 15:13:11 发布

原创最新推荐文章于 2025-05-30 15:13:11 发布 · 374 阅读

0 ·

CC 4.0 BY-SA版权

Android 专栏收录该内容

103 篇文章

订阅专栏

本文介绍了一种通过Android的BindService机制实现截图功能的方法。具体步骤包括创建服务连接、定义服务意图、发送消息给服务并接收反馈。适用于希望了解BindService高级用法的开发者。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

BindService使用方法：
（以载屏操作为例）
调用者：

private void takeScreenshot() {
    synchronized (mScreenshotLock) {
        if (mScreenshotConnection != null) {
            return;
        }
        if(DEBUG) Log.d(TAG, "---takeScreenshot-----");
        moveFlag = false;
        ComponentName cn = new ComponentName("com.android.systemui",
                "com.android.systemui.screenshot.TakeScreenshotService");
        Intent intent = new Intent();
        intent.setComponent(cn);
        ServiceConnection conn = new ServiceConnection() {
            @Override
            public void onServiceConnected(ComponentName name, IBinder service) {
                synchronized (mScreenshotLock) {
                    if (mScreenshotConnection != this) {
                        return;
                    }
                    Messenger messenger = new Messenger(service);
                    Message msg = Message.obtain(null, 1);
                    final ServiceConnection myConn = this;
                    Handler h = new Handler(mHandler.getLooper()) {
                        @Override
                        public void handleMessage(Message msg) {
                            synchronized (mScreenshotLock) {
                                if (mScreenshotConnection == myConn) {
                                   if(DEBUG) Log.d(TAG, "---grabFlag set false ok");
                                    grabFlag = false;
                                    unbindService(mScreenshotConnection);
                                    mScreenshotConnection = null;
                                    mHandler.removeCallbacks(mScreenshotTimeout);
                                }
                            }
                        }
                    };
                    msg.replyTo = new Messenger(h);
                    msg.arg1 = msg.arg2 = 0;

                        msg.arg1 = 1;

                        msg.arg2 = 1;
                    try {

                       if(DEBUG) Log.d(TAG, "---LogControlerService---send--message---");
                        messenger.send(msg);
                    } catch (RemoteException e) {
                    }
                }
            }
            @Override
            public void onServiceDisconnected(ComponentName name) {}
        };
        if (bindService(intent, conn, Context.BIND_AUTO_CREATE, UserHandle.USER_CURRENT)) {
             mScreenshotConnection = conn;
             mHandler.postDelayed(mScreenshotTimeout, 10000);
         }
     }
}

处理者：
package com.android.systemui.screenshot;

import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;

public class TakeScreenshotService extends Service {
    private static final String TAG = "TakeScreenshotService";

    private static GlobalScreenshot mScreenshot;

    private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case 1:
                    final Messenger callback = msg.replyTo;
                    if (mScreenshot == null) {
                        mScreenshot = new GlobalScreenshot(TakeScreenshotService.this);
                    }
                    mScreenshot.takeScreenshot(new Runnable() {
                        @Override public void run() {
                            Message reply = Message.obtain(null, 1);
                            try {
                                callback.send(reply);
                            } catch (RemoteException e) {
                            }
                        }
                    }, msg.arg1 > 0, msg.arg2 > 0);
            }
        }
    };

    @Override
    public IBinder onBind(Intent intent) {
        return new Messenger(mHandler).getBinder();
    }
}