Question

在我的应用程序中，我希望用户正确输入一个4位数的引脚，以便能够继续到下一个屏幕，作为一种＆＃34; faux＆＃34;验证过程。（这只是一个演示）如何设置正确的＆＃34; if＆＃34;用于验证用户输入的语句是否正确？我有以下java代码： - 在第一个按钮点击并输入＆＃34; 0000＆＃34;它会回到原来的屏幕。 - 点击第二个按钮后，它会转到右边第二个/下一个屏幕

    private void pincheck() {
    if (mGoogleApiClient.isConnected()) {
        // get prompts.xml view
        LayoutInflater li = LayoutInflater.from(context);
        View promptsView = li.inflate(R.layout.prompts, null);

        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                context);

        // set prompts.xml to alertdialog builder
        alertDialogBuilder.setView(promptsView);

        final EditText userInput = (EditText) promptsView
                .findViewById(R.id.editTextDialogUserInput);

        if (userInput.getText().toString().equals("0000")) {
            //moves to the "DoorControl xml page"
            Intent i = new Intent(this, LogIn.class);
            startActivity(i);
        }

        // set dialog message
        alertDialogBuilder
            .setCancelable(false)
            .setPositiveButton("OK",
              new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog,int id) {
                // get user input and set it to result
                // edit text
                result.setText(userInput.getText());
                }
              })
            .setNegativeButton("Cancel",
              new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog,int id) {
                dialog.cancel();
                }
              });

        // create alert dialog
        AlertDialog alertDialog = alertDialogBuilder.create();

        // show it
        alertDialog.show();

     }
}

谢谢你，我已经在这里工作了几个小时，无法找到最好的方法！它要么崩溃，要么没有改变意图“门控”＆＃34;页。

感谢您提供任何帮助/链接/建议。：）

mainactivity XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/wood"
    android:orientation="vertical"
    android:padding="16dp"
    tools:context=".MainActivity" >

    <LinearLayout
        android:id="@+id/llProfile"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"
        android:orientation="horizontal"
        android:weightSum="3"
        android:visibility="gone">

        <ImageView
            android:id="@+id/imgProfilePic"
            android:layout_width="80dp"
            android:visibility="gone"
            android:layout_height="wrap_content"
            android:layout_weight="1"/>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:orientation="vertical"
            android:layout_weight="2" >

            <TextView
                android:id="@+id/textview1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="AUTOLOCK"
                android:layout_gravity="center"
                android:textSize="70sp"
                android:textStyle="bold"
                android:typeface="serif" />

            <TextView
                android:id="@+id/txtName"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="5dp"
                android:layout_gravity="center"
                android:textSize="40sp"
                android:textStyle="bold" />
        </LinearLayout>
    </LinearLayout>

    <TextView
        android:id="@+id/txtEmail"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:layout_gravity="center"
        android:textSize="30sp"
        android:textStyle="bold" />

    <com.google.android.gms.common.SignInButton
        android:id="@+id/btn_sign_in"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"/>

    <Button
        android:id="@+id/btn_revoke_access"
        android:layout_marginTop="100dp"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Lock Control"
        android:visibility="gone"
        android:layout_marginBottom="10dp"/>

    <Button
        android:id="@+id/btn_sign_out"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/btn_logout_from_google"
        android:visibility="gone" />

    <Button
        android:id="@+id/two"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Revoke Access"
        android:visibility="gone" />

    <EditText
        android:id="@+id/editTextResult"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Sample"
        android:inputType="number"
        android:visibility="gone" />

</LinearLayout>

提示XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout_root"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:padding="10dp" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Type Your Message : "
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <EditText
        android:id="@+id/editTextDialogUserInput"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="4"
        android:inputType="number" >

        <requestFocus />

    </EditText>

</LinearLayout>

loginscreen.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/wood"
    android:padding="20dp"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".login" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="AUTOLOCK"
        android:textStyle="bold"
        android:textSize="50sp"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="75dp"
        android:text="Door is:"
        android:textSize="30sp"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="75dp"
        android:text="Door is:"
        android:textSize="30sp"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <Button
        android:id="@+id/btnOn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="200dp"
        android:layout_gravity="center"
        android:text="Lock" />

    <Button
        android:id="@+id/btnOff"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Unlock" />

    <TextView
        android:id="@+id/txtArduino"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:visibility="gone"
        android:text="Sample Text" />

</LinearLayout>

LogIn.java

package com.example.autolock;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.util.UUID;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class LogIn extends Activity {
  private static final String TAG = "bluetooth2";

  Button btnOn, btnOff;
  TextView txtArduino;
  Handler h;

  final int RECIEVE_MESSAGE = 1;        // Status  for Handler
  private BluetoothAdapter btAdapter = null;
  private BluetoothSocket btSocket = null;
  private StringBuilder sb = new StringBuilder();

  private ConnectedThread mConnectedThread;

  // SPP UUID service
  private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

  // MAC-address of Bluetooth module (you must edit this line)
  private static String address = "00:13:12:06:48:79";

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.loginscreen);

    btnOn = (Button) findViewById(R.id.btnOn);                  // button LED ON
    btnOff = (Button) findViewById(R.id.btnOff);                // button LED OFF
    txtArduino = (TextView) findViewById(R.id.txtArduino);      // for display the received data from the Arduino

    h = new Handler() {
        public void handleMessage(android.os.Message msg) {
            switch (msg.what) {
            case RECIEVE_MESSAGE:                                                   // if receive massage
                byte[] readBuf = (byte[]) msg.obj;
                String strIncom = new String(readBuf, 0, msg.arg1);                 // create string from bytes array
                sb.append(strIncom);                                                // append string
                int endOfLineIndex = sb.indexOf("\r\n");                            // determine the end-of-line
                if (endOfLineIndex > 0) {                                            // if end-of-line,
                    String sbprint = sb.substring(0, endOfLineIndex);               // extract string
                    sb.delete(0, sb.length());                                      // and clear
                    txtArduino.setText("Data from Arduino: " + sbprint);            // update TextView
                    btnOff.setEnabled(true);
                    btnOn.setEnabled(true); 
                }
                //Log.d(TAG, "...String:"+ sb.toString() +  "Byte:" + msg.arg1 + "...");
                break;
            }
        };
    };

    btAdapter = BluetoothAdapter.getDefaultAdapter();       // get Bluetooth adapter
    checkBTState();

    btnOn.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
//        btnOn.setEnabled(true);
        mConnectedThread.write("1");    // Send "1" via Bluetooth
        Toast.makeText(getBaseContext(), "Door is locked", Toast.LENGTH_SHORT).show();
      }
    });

    btnOff.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
//        btnOff.setEnabled(true);  
        mConnectedThread.write("0");    // Send "0" via Bluetooth
        Toast.makeText(getBaseContext(), "Door is unlocked", Toast.LENGTH_SHORT).show();
      }
    });
  }

  private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
      if(Build.VERSION.SDK_INT >= 10){
          try {
              final Method  m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
              return (BluetoothSocket) m.invoke(device, MY_UUID);
          } catch (Exception e) {
              Log.e(TAG, "Could not create Insecure RFComm Connection",e);
          }
      }
      return  device.createRfcommSocketToServiceRecord(MY_UUID);
  }

  @Override
  public void onResume() {
    super.onResume();

    Log.d(TAG, "...onResume - try connect...");

    // Set up a pointer to the remote node using it's address.
    BluetoothDevice device = btAdapter.getRemoteDevice(address);

    // Two things are needed to make a connection:
    //   A MAC address, which we got above.
    //   A Service ID or UUID.  In this case we are using the
    //     UUID for SPP.

    try {
        btSocket = createBluetoothSocket(device);
    } catch (IOException e) {
        errorExit("Fatal Error", "In onResume() and socket create failed: " + e.getMessage() + ".");
    }

    // Discovery is resource intensive.  Make sure it isn't going on
    // when you attempt to connect and pass your message.
    btAdapter.cancelDiscovery();

    // Establish the connection.  This will block until it connects.
    Log.d(TAG, "...Connecting...");
    try {
      btSocket.connect();
      Log.d(TAG, "....Connection ok...");
    } catch (IOException e) {
      try {
        btSocket.close();
      } catch (IOException e2) {
        errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
      }
    }

    // Create a data stream so we can talk to server.
    Log.d(TAG, "...Create Socket...");

    mConnectedThread = new ConnectedThread(btSocket);
    mConnectedThread.start();
  }

  @Override
  public void onPause() {
    super.onPause();

    Log.d(TAG, "...In onPause()...");

    try     {
      btSocket.close();
    } catch (IOException e2) {
      errorExit("Fatal Error", "In onPause() and failed to close socket." + e2.getMessage() + ".");
    }
  }

  private void checkBTState() {
    // Check for Bluetooth support and then check to make sure it is turned on
    // Emulator doesn't support Bluetooth and will return null
    if(btAdapter==null) { 
      errorExit("Fatal Error", "Bluetooth not support");
    } else {
      if (btAdapter.isEnabled()) {
        Log.d(TAG, "...Bluetooth ON...");
      } else {
        //Prompt user to turn on Bluetooth
        Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(enableBtIntent, 1);
      }
    }
  }

  private void errorExit(String title, String message){
    Toast.makeText(getBaseContext(), title + " - " + message, Toast.LENGTH_LONG).show();
    finish();
  }

  private class ConnectedThread extends Thread {
        private final InputStream mmInStream;
        private final OutputStream mmOutStream;

        public ConnectedThread(BluetoothSocket socket) {
            InputStream tmpIn = null;
            OutputStream tmpOut = null;

            // Get the input and output streams, using temp objects because
            // member streams are final
            try {
                tmpIn = socket.getInputStream();
                tmpOut = socket.getOutputStream();
            } catch (IOException e) { }

            mmInStream = tmpIn;
            mmOutStream = tmpOut;
        }

        public void run() {
            byte[] buffer = new byte[256];  // buffer store for the stream
            int bytes; // bytes returned from read()

            // Keep listening to the InputStream until an exception occurs
            while (true) {
                try {
                    // Read from the InputStream
                    bytes = mmInStream.read(buffer);        // Get number of bytes and message in "buffer"
                    h.obtainMessage(RECIEVE_MESSAGE, bytes, -1, buffer).sendToTarget();     // Send to message queue Handler
                } catch (IOException e) {
                    break;
                }
            }
        }

        /* Call this from the main activity to send data to the remote device */
        public void write(String message) {
            Log.d(TAG, "...Data to send: " + message + "...");
            byte[] msgBuffer = message.getBytes();
            try {
                mmOutStream.write(msgBuffer);
            } catch (IOException e) {
                Log.d(TAG, "...Error data send: " + e.getMessage() + "...");     
              }
        }
    }
}

下面的Logcat：

   04-30 21:14:30.070: D/dalvikvm(10939): GC_CONCURRENT freed 569K, 10% free 17853K/19655K, 
paused 14ms+16ms, total 101ms
04-30 21:14:30.242: D/bluetooth2(10939): ...Bluetooth ON...
04-30 21:14:30.242: D/bluetooth2(10939): ...onResume - try connect...
04-30 21:14:30.250: V/BluetoothSocket.cpp(10939): initSocketNative
04-30 21:14:30.250: V/BluetoothSocket.cpp(10939): ...fd 40 created (RFCOMM, lm = 0)
04-30 21:14:30.250: V/BluetoothSocket.cpp(10939): initSocketFromFdNative
04-30 21:14:30.414: D/bluetooth2(10939): ...Connecting...
04-30 21:14:30.429: D/BluetoothUtils(10939): isSocketAllowedBySecurityPolicy start : device null
04-30 21:14:35.593: V/BluetoothSocket.cpp(10939): abortNative
04-30 21:14:35.593: V/BluetoothSocket.cpp(10939): ...asocket_abort(40) complete
04-30 21:14:35.593: V/BluetoothSocket.cpp(10939): destroyNative
04-30 21:14:35.593: V/BluetoothSocket.cpp(10939): ...asocket_destroy(40) complete
04-30 21:14:35.593: D/bluetooth2(10939): ...Create Socket...
04-30 21:14:35.617: I/Choreographer(10939): Skipped 327 frames!  The application may be doing too much work on its main thread.

Answer 1

发现我的错误：我正在检查activitymain.xml上的edittext是否设置为“0000”。不是直接在prompts.xml中的edittext。

我将if语句移动到onclick中的“OK”按钮。

如果有人愿意将这个问题记录下来，那么我的分数不会受到伤害我会非常感激：）

如果语句字符串比较不启动意图

1 个答案: