try {
 // 初始化参数（海外数据中心与 §4 OpenSDK 初始化 host 保持一致）
 CommonParam commonParam = new CommonParam();
 commonParam.setEnvirment("https://openapi-[DataCenter].easy4ip.com:443");
 commonParam.setContext(MainActivity.this.getApplication());
 commonParam.setAppId("…"); // 开放平台 AppId
 commonParam.setAppSecret("…"); // 开放平台 AppSecret（仅建议放在服务端，Demo 为演示写在客户端）
 LCDeviceEngine.newInstance().init(commonParam);
 } catch (Throwable throwable) {
 throwable.printStackTrace();
 }
 findViewById(R.id.tv_add).setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 try {
 LCDeviceEngine.newInstance().addDevice(MainActivity.this);
 } catch (Exception e) {
 e.printStackTrace();
 }
 }
 });

// init LCOpenSDK_Api
String token = ""; // Developer access token
String host = "openapi-[Data Center].easy4ip.com:443";
InitParams initParams = new InitParams(this, host, token);
try {
 int iRet = LCOpenSDK_Api.initOpenApi(initParams);
} catch (Throwable throwable) {
 throwable.printStackTrace();
}

//Initialize the layout
FrameLayout fr_window = findViewById(R.id.live_window);
 FrameLayout getFr_window_content = findViewById(R.id.live_window_content);
//Calculate the height of fr_window in a ratio of 9:16
 LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(fr_window.getLayoutParams());
 DisplayMetrics metrics = new DisplayMetrics();
 getWindowManager().getDefaultDisplay().getMetrics(metrics);
 layoutParams.width =metrics.widthPixels;//screen width
 layoutParams.height = metrics.heightPixels*9/16;
 layoutParams.setMargins(0, 0, 0, 0);
 fr_window.setLayoutParams(layoutParams);

//Initialize playwindow
LCOpenSDK_PlayRealWindow playWindow= new LCOpenSDK_PlayRealWindow();
playWindow.initPlayWindow(this, (ViewGroup) findViewById(R.id.live_window_content), 0, false);
//The developer implements event monitoring and sets the monitoring to playWindow
LCOpenSDK_EventListener listener = new LCOpenSDK_EventListener(){...}//Developer implements event listener callback
playWindow.setWindowListener(listener);
//Turn on tidy up monitoring
playWindow.openTouchListener();
/**
 * Start preview
 * 1. Prepare to preview the parameters
 * 2. Open preview
 * 3. Process the preview result in the LCOpenSDK_EventListener callback
 * 4. Stop preview
 * 5. Release resources
 */
LCOpenSDK_ParamReal paramReal = new LCOpenSDK_ParamReal()
playWindow.playRtspReal(paramReal);
playWindow.stopRtspReal(true);
playWindow.uninitPlayWindow();

//Initialize playwindow
LCOpenSDK_PlayBackWindow playWindow= new LCOpenSDK_PlayBackWindow();
playWindow.initPlayWindow(this, (ViewGroup) findViewById(R.id.live_window_content), 0, true);
//The developer implements event monitoring and sets the monitoring to playWindow
LCOpenSDK_EventListener listener = new LCOpenSDK_EventListener(){...}//Developer implements event listener callback
playWindow.setWindowListener(listener);
//Turn on tidy up monitoring
playWindow.openTouchListener();
/**
 * Start playback
 * 1. Ready to playback parameters
 * 2. Turn on playback
 * 3. Process the playback result in the LCOpenSDK_EventListener callback
 * 4. Stop playback
 * 5. Release resources
 */
LCOpenSDK_ParamDeviceRecord paramDeviceRecord = new LCOpenSDK_ParamDeviceRecord(...);//Developers get it from the video list
playWindow.playRtspPlayback(paramDeviceRecord);
playWindow.stopRtspPlayback(true);
playWindow.uninitPlayWindow();

//Initialize playwindow
LCOpenSDK_PlayBackWindow playWindow = new LCOpenSDK_PlayBackWindow();
playWindow.initPlayWindow(this, (ViewGroup) findViewById(R.id.live_window_content), 0, true);
//The developer implements event monitoring and sets the monitoring to playWindow
LCOpenSDK_EventListener listener = new LCOpenSDK_EventListener(){...}//Developer implements event listener callback
playWindow.setWindowListener(listener);
//Turn on tidy up monitoring
playWindow.openTouchListener();
/**
 * Start playback
 * 1. Ready to playback parameters
 * 2. Turn on playback
 * 3. Process the playback result in the LCOpenSDK_EventListener callback
 * 4. Stop playback
 * 5. Release resources
 */
LCOpenSDK_ParamCloudRecord paramCloudRecord = new LCOpenSDK_ParamCloudRecord(...)//The developer gets it from the cloud recording list
playWindow.playCloud(paramCloudRecord);
playWindow.stopCloud(true);
playWindow.uninitPlayWindow();

//Turn off the preview sound
playWindow.stopAudio();
//Set up intercom monitoring
LCOpenSDK_Talk.setListener(new LCOpenSDK_TalkerListener());
//Prepare the intercom parameters (the developer obtains the device information currently being previewed)
LCOpenSDK_ParamTalk paramTalk = new LCOpenSDK_ParamTalk(...);
//Start intercom
LCOpenSDK_Talk.playTalk(paramTalk);
//Stop intercom
LCOpenSDK_Talk.stopTalk();
//Release the intercom monitor
LCOpenSDK_Talk.setListener(null);
//Turn on the preview sound
playWindow.playAudio();

//Get device recording list (developer requests to get it)
// queryLocalRecords — 见 [本地录像查询](/book/zh/05-api/90.old/device/record/local/summary.html)
//Set up download listener (the developer overrides the LCOpenSDK_DownloadListener class method)
LCOpenSDK_Download.setListener(new LCOpenSDK_DownloadListener());
//Start downloading (the developer is ready to download parameters)
LCOpenSDK_Download.startDownload(...);

//Get cloud recording list (developer requests to get it)
// queryCloudRecords — 见 [云录像查询](/book/zh/05-api/11.cloud/summary.html)
//Set up download listener (the developer overrides the LCOpenSDK_DownloadListener class method)
LCOpenSDK_Download.setListener(new LCOpenSDK_DownloadListener());
//Start downloading (the developer is ready to download parameters)
 LCOpenSDK_Download.startDownload(...);

byte[] dataOut = null;
int ret = LCOpenSDK_Utils.decryptPic(encryptedBytes, deviceId, decryptKey, dataOut);
// ret == 0 时 dataOut 为可展示的 JPEG/PNG 字节流，可交给 Bitmap 或图片控件