-2
在我的应用程序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“人造”身份验证过程。 （这仅用于演示） 如何设置正确的“if”语句来验证用户输入是正确的数字？我有以下的java代码： -第一个按钮点击并输入“0000”后，它回到原来的屏幕。 -after第二个按钮点击，然后又把我的权利到第二/下一屏幕如果语句字符串比较没有启动意图
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，我一直在这几个小时，不能找出做到这一点的最好办法！它要么崩溃要么不改变“门禁控制”页面的意图。
谢谢你的任何帮助/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() + "...");
}
}
}
}
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.
什么呢'的System.out.println（userInput.getText（）。 toString（））;'show？ –
当你的应用程序崩溃logcat中记录了什么错误？ – donfuxx
请发布错误日志。 – Kedarnath