如何在android模拟器上以编程方式设置虚拟场景图像

Question

我已经为 Flutter 项目编写了一些驱动测试，并且我可以使用 android 模拟器提供的 virtual scene 工具成功测试条码扫描仪功能。

但是，有很多情况需要针对不同的条形码进行测试。我想为每个案例在虚拟场景上设置一个特定的条形码图像。有可能吗？

我发现这张图片的值被放在了~/.android/avd/[emulatorName]/AVD.conf 文件的virtualscene\posters 变量中。

virtualscene\posters=@Variant(\0\0\0\b\0\0\0\x2\0\0\0\b\0w\0\x61\0l\0l\0\0\0\n\xff\xff\xff\xff\0\0\0\n\0t\0\x61\0\x62\0l\0\x65\0\0\0\n\xff\xff\xff\xff)

virtualscene\posters=@Variant(\0\0\0\b\0\0\0\x2\0\0\0\b\0w\0\x61\0l\0l\0\0\0\n\ 0\0\0\\\0/\0U\0s\0\x65\0r\0s\0/\0l\0\x65\0o\0n\0\x61\0r\0\x64\0o\0.\0\x61\0r\0m\0\x65\0r\0o\0/\0\x44\0\x65\0s\0k\0t\0o\0p\0/\0J\0\x61\0m\0\x65\0s\0W\0i\0l\0s\0o\0n\0.\0p\0n\0g\0\0\0\n\0t\0\x61\0\x62\0l\0\x65\0\0\0\n\xff\xff\xff\xff)

Answer 1

您可以将位于$ANDROID_SDK_HOME/emulator/resources/poster.png 的默认（全局）图像替换为您的 poster.png 图像， 也不要通过编辑文件$ANDROID_SDK_HOME/emulator/resources/Toren1BD.posters来更改默认指针。

Answer 2

您可以将虚拟场景图像设置为指定路径。并在测试时操纵目标图像。 由于 Instrumented 测试在您的（虚拟）设备上运行，因此它无法直接操作主机文件。可以做什么（这是一个丑陋的黑客）是在主机上启动一个服务器，可以从具有主机环回“10.0.2.2”地址的虚拟设备访问该服务器。 该服务器可以操作目标文件。 如果有人有更好的解决方案，请分享！

这里有一个示例服务器和客户端。

服务器：

import java.io.*;
import java.net.*;
import java.nio.channels.FileChannel;

public class FileManipulatorServer {
    public static void main(String args[]) {
        int port = 6789;
        FileManipulatorServer server = new FileManipulatorServer( port );
        server.startServer();
    }

    // declare a server socket and a client socket for the server

    private ServerSocket fileManipulatorServer = null;
    private Socket clientSocket = null;
    private int port;

    public FileManipulatorServer(int port ) {
        this.port = port;
    }

    public void stopServer() {
        System.out.println( "Server cleaning up." );
        System.exit(0);
    }

    public void startServer() {
        // Try to open a server socket on the given port
        // Note that we can't choose a port less than 1024 if we are not
        // privileged users (root)

        try {
            fileManipulatorServer = new ServerSocket(port);
        }
        catch (IOException e) {
            System.out.println(e);
        }

        System.out.println( "Waiting for connections. Only one connection is allowed." );

        // Create a socket object from the ServerSocket to listen and accept connections.
        // Use FileManipulatorTask to process the connection.

        while ( true ) {
            try {
                clientSocket = fileManipulatorServer.accept();
                FileManipulatorTask task = new FileManipulatorTask(clientSocket, this);
                task.run();
            }
            catch (IOException e) {
                System.out.println(e);
            }
        }
    }
}

class FileManipulatorTask {
    private BufferedReader is;
    private PrintStream os;
    private Socket clientSocket;
    private FileManipulatorServer server;

    public FileManipulatorTask(Socket clientSocket, FileManipulatorServer server) {
        this.clientSocket = clientSocket;
        this.server = server;
        System.out.println( "Connection established with: " + clientSocket );
        try {
            is = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
            os = new PrintStream(clientSocket.getOutputStream());
        } catch (IOException e) {
            System.out.println(e);
        }
    }

    public void run() {
        String line;
        try {
            boolean serverStop = false;

            line = is.readLine();
            System.out.println( "Received " + line );
            saveImageToPoster(line.trim());

            os.println("OK");
            os.flush();

            System.out.println( "Connection closed." );
            is.close();
            os.close();
            clientSocket.close();

            if ( serverStop ) server.stopServer();
        } catch (IOException e) {
            System.out.println(e);
        }
    }

    private void saveImageToPoster(String filename) {

        try {
            FileChannel src = new FileInputStream("C:\\fullpathtopostercandidates\\"+filename).getChannel();
            FileChannel dest = new FileOutputStream("C:\\fullpathtoconfiguredposter\\poster.jpg").getChannel();
            dest.transferFrom(src, 0, src.size());
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

客户：

import java.io.*;
import java.net.*;

public class FileNameSenderClient {

    private String hostname = "10.0.2.2";
    private int port = 6789;

    public void sendFileName(String filename) {

        Socket clientSocket = null;
        DataOutputStream os = null;
        BufferedReader is = null;
        try {
            clientSocket = new Socket(hostname, port);
            os = new DataOutputStream(clientSocket.getOutputStream());
            is = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
        } catch (UnknownHostException e) {
            System.err.println("Don't know about host: " + hostname);
        } catch (IOException e) {
            System.err.println("Couldn't get I/O for the connection to: " + hostname);
        }


        if (clientSocket == null || os == null || is == null) {
            System.err.println( "Something is wrong. One variable is null." );
            return;
        }

        try {
            System.out.println("Write to output stream");
            os.writeBytes( filename +"\n");
            os.flush();
            String responseLine = is.readLine();             
            System.out.println("Server returns: " + responseLine);
            os.close();
            is.close();
            clientSocket.close();
        } catch (UnknownHostException e) {
            System.err.println("Trying to connect to unknown host: " + e);
        } catch (IOException e) {
            System.err.println("IOException:  " + e);
        }
    }
}

像这样使用您的仪器测试中的 FileNameSenderClient。

@Test
public void testQRcodeReadingOK()
{
   FileNameSenderClient c = new FileNameSenderClient();
   c.sendFileName("QRCode.jpg");

   //your code that wants to use the image, like the this:

    onView(withId(R.id.load_qr_code)).perform(click());
}