Question

所以假设我有4个按钮，每个按钮包含导航到某个活动的意图。他们都导航到一个相同的活动。当我点击第一个按钮时，我希望新活动显示“嗨”，当我点击第二个按钮时，我希望它显示“再见”等等。我怎么做？这是一个以

开头的简单代码

public class Intentt extends Activity {
Button b1,b2,b3,b4;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_intentt);
    b1 = (Button)findViewById(R.id.button2);
    b2 = (Button)findViewById(R.id.button3);
    b3 = (Button)findViewById(R.id.button4);
    b4 = (Button)findViewById(R.id.button5);
    b1.setOnClickListener( new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i  = new Intent(Intentt.this,MainActivity.class);
            startActivity(i);
        }
    });
    b2.setOnClickListener( new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i  = new Intent(Intentt.this,MainActivity.class);
            startActivity(i);
        }
    });
    b3.setOnClickListener( new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i  = new Intent(Intentt.this,MainActivity.class);
            startActivity(i);
        }
    });
    b4.setOnClickListener( new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i  = new Intent(Intentt.this,MainActivity.class);
            startActivity(i);
        }
    });
}

Answer 1

只是通过意图附加内容传递一些数据，或者意图额外Bundle：

Intent i=new Intent(context,MainActivity.class);
i.putExtra(id, 453);
context.startActivity(i);

示例：

Button b1, b2, b3, b4;
Context context = this;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_intentt);
    b1 = (Button) findViewById(R.id.button2);
    b2 = (Button) findViewById(R.id.button3);
    b3 = (Button) findViewById(R.id.button4);
    b4 = (Button) findViewById(R.id.button5);

    b1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i = new Intent(context, MainActivity.class);
            i.putExtra(MainActivity.ID_ACTION, MainActivity.ACTION_1);
            startActivity(i);
        }
    });
    b2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i = new Intent(context, MainActivity.class);
            i.putExtra(MainActivity.ID_ACTION, MainActivity.ACTION_2);
            startActivity(i);
        }
    });
}

然后在那个活动中你可以打开这些值，就像那样：

String id = intent.getStringExtra("id");
int id = intent.getIntExtra("id",-1);

然后使用if-elseif-else或switch语句根据传递的操作更改操作，以便显示消息

要正确接收它们，您需要在AndroidManifest.xml中将活动的launchMode设置为“标准”because of this bug并创建

public static final int ACTION_1 = 1;
public static final int ACTION_2 = 2;
public static final int ACTION_NULL = -1;
public static final String ID_ACTION = "action_id";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    int id = getIntent().getIntExtra(ID_ACTION, -1);

    if (id == ACTION_NULL) {
        Log.d("TAG", "id is null");
        Toast.makeText(MainActivity.this, "id is null!", Toast.LENGTH_SHORT).show();
    } else if (id == ACTION_1) {
        Log.i("TAG", "ALLOHA! from button 1");
         Toast.makeText(MainActivity.this, "Aloha from button 1!", Toast.LENGTH_LONG).show();
    } else if (id == ACTION_2) {
        Log.i("TAG", "Hello from button 2");
         Toast.makeText(MainActivity.thi,"Hello from button 2!", Toast.LENGTH_LONG).show();
    }
}

Answer 2

在每个意图中，您都可以传递参数

Intent i=new Intent(context,SendMessage.class);
i.putExtra("KEY_MESSAGE", "Hola amigo");

在其他活动中

 Intent i = getIntent();
 String message = i.getStringExtra("KEY_MESSAGE")
 Toast.make(this,message,Toast.LENGTH_SHORT).show()

Answer 3

重新编写按钮单击侦听器，如下所示：

b1.setOnClickListener( new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent i  = new Intent(Intentt.this,MainActivity.class);
        i.putExtra("Data","Hi");
        startActivity(i);
    }
});
b2.setOnClickListener( new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent i  = new Intent(Intentt.this,MainActivity.class);
        i.putExtra("Data","Hello");
        startActivity(i);
    }
});
b3.setOnClickListener( new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent i  = new Intent(Intentt.this,MainActivity.class);
        i.putExtra("Data","Bye");
        startActivity(i);
    }
});
b4.setOnClickListener( new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent i  = new Intent(Intentt.this,MainActivity.class);
        i.putExtra("Data","See you");
        startActivity(i);
    }
});

在您的MainActivity类onCreate方法中，您可以通过以下方式访问传递的数据：

String passedData = getIntent().getStringExtra("Data");

您可以使用此传递的数据在屏幕上显示。

Answer 4

这样做：

class Program
{
    static Socket socketForClient;
    static NetworkStream networkStream;
    static System.IO.StreamReader streamReader;
    static System.IO.StreamWriter streamWriter;
    static TcpListener tcpListener;
    static int PORT;
    static void Main(string[] args)
    {

        //Console.WriteLine("Enter Port : ");
        //PORT = Convert.ToInt32(Console.ReadLine());
        PORT = 12500;

        Console.WriteLine("\n" + "Your Host Information Is : "+"\n" );
        IPAddress[] localIPs = Dns.GetHostAddresses(Dns.GetHostName());
        foreach (IPAddress ip in localIPs)
        {
            Console.WriteLine(ip.ToString());
        }
        while (true)
        {
        tcpListener = new TcpListener(PORT);
        Console.WriteLine("\n >> Server started ... Waiting for Message");
        tcpListener.Start();

        try
        {
            socketForClient = tcpListener.AcceptSocket();
        }
        catch (System.Exception e1)
        {
            Console.WriteLine("LN: 40");
            Console.WriteLine("Message: " + e1.Message);
            Console.WriteLine("InnerException: " + e1.InnerException);
            Console.WriteLine("Source: " + e1.Source);
            Console.ReadLine();

        }
        if (socketForClient.Connected)
        {
            Console.WriteLine("Client connected");
            try
            {
                networkStream = new NetworkStream(socketForClient);
            }
            catch (System.Exception e1)
            {
                Console.WriteLine("LN: 55");
                Console.WriteLine("Message: " + e1.Message);
                Console.WriteLine("InnerException: " + e1.InnerException);
                Console.WriteLine("Source: " + e1.Source);
                Console.ReadLine();

            }
            //System.IO.StreamWriter streamWriter = new System.IO.StreamWriter(networkStream);
            try
            {
                streamReader = new System.IO.StreamReader(networkStream);
                 streamWriter = new System.IO.StreamWriter(networkStream);
            }
            catch (System.Exception e1)
            {
                Console.WriteLine("LN: 71");
                Console.WriteLine("Message: " + e1.Message);
                Console.WriteLine("InnerException: " + e1.InnerException);
                Console.WriteLine("Source: " + e1.Source);
                Console.ReadLine();

            }
            string theString = "Sending";
            // streamWriter.WriteLine(theString);
            Console.WriteLine(theString);
            //streamWriter.Flush();
            long x = 0;


                try
                {
                    x++;
                    theString = streamReader.ReadLine();
                    if (theString.Trim() == "4-")
                    {
                        Console.WriteLine("Sending Report Data : 0-100-0-0");
                        streamWriter.WriteLine("0-70-0-0");
                        Console.WriteLine("pocket sent");
                        streamWriter.Flush();

                    }
                    Console.WriteLine(theString + x.ToString());

                    streamReader.Close();
                    networkStream.Close();
                    socketForClient.Close();
                    tcpListener.Stop();



                }
                catch (System.Exception e1)
                {

                    streamReader.Close();
                    networkStream.Close();
                    socketForClient.Close();

                    Console.WriteLine("LN: 97");
                    Console.WriteLine("Message: " + e1.Message);
                    Console.WriteLine("InnerException: " + e1.InnerException);
                    Console.WriteLine("Source: " + e1.Source);
                    Console.ReadLine();

                    break;
                    //streamWriter.Close();
                }
            }

        }

        streamReader.Close();
        networkStream.Close();
        socketForClient.Close();

        Console.WriteLine("Closed Socket");
        Console.ReadLine();

    }
}

之后在您发送的mainActivity检索字符串中：

    public class Intentt extends Activity implements View.OnClickListener {
Button b1,b2,b3,b4;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_intentt);
    b1 = (Button)findViewById(R.id.button2);
    b2 = (Button)findViewById(R.id.button3);
    b3 = (Button)findViewById(R.id.button4);
    b4 = (Button)findViewById(R.id.button5);
    b1.setOnClickListener(this);
    b2.setOnClickListener(this);
    b3.setOnClickListener(this);
    b4.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {


            switch (v.getId()) {
                case R.id.button2:

                    Intent i  = new Intent(Intentt.this,MainActivity.class);
                    i.putExtra('"STRING_I_NEED"', "Hi");
                    startActivity(i)

                    break;
                case R.id.button3:
                    Intent i  = new Intent(Intentt.this,MainActivity.class);
                    i.putExtra('"STRING_I_NEED"', "Bye");
                    startActivity(i)

                    break;

                case R.id.button4:

                    break;
                    .
                    .
                    .
            }
    }
}

获得某些意图

4 个答案: