您好我正在研究如何将注册信息放入DB中。当我点击“立即注册”＆＃34;登录页面中的按钮，应用程序关闭。我该怎么办这个问题？
Login.java代码
public class Login extends Activity {
EditText ET_NAME,ET_PASS;
String login_name,login_pass;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login_main);
ET_NAME = (EditText)findViewById(R.id.user_name);
ET_PASS = (EditText)findViewById(R.id.user_pass);
}
public void userReg(View view)
{
startActivity(new Intent(this,Register.class));
}
public void userLogin(View view)
{
login_name = ET_NAME.getText().toString();
login_pass = ET_PASS.getText().toString();
String method = "login";
BackgroundTask backgroundTask = new BackgroundTask(this);
backgroundTask.execute(method,login_name,login_pass);
}
}
Register.java
public class Register extends Activity {
EditText ET_NAME,ET_USER_NAME,ET_USER_PASS;
String name,user_name,user_pass;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.register_layout);
ET_NAME = (EditText)findViewById(R.id.name);
ET_USER_NAME= (EditText)findViewById(R.id.new_user_name);
ET_USER_PASS = (EditText)findViewById(R.id.new_user_pass);
}
public void userReg(View view)
{
name = ET_NAME.getText().toString();
user_name = ET_USER_NAME.getText().toString();
user_pass =ET_USER_PASS.getText().toString();
String method = "register";
BackgroundTask backgroundTask = new BackgroundTask(this);
backgroundTask.execute(method,name,user_name,user_pass);
finish();
}
和日志。
No apk changes detected since last installation, skipping installation of C:\Android\1113GMDemo1\app\build\outputs\apk\app-debug.apk
$ adb shell am force-stop com.example.jina.a1105gmdemo
$ adb shell am start -n "com.example.jina.a1105gmdemo/com.example.jina.a1105gmdemo.Login" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER -D
Connecting to com.example.jina.a1105gmdemo
I/System.out: Sending WAIT chunk
W/ActivityThread: Application com.example.jina.a1105gmdemo is waiting for the debugger on port 8100...
I/dalvikvm: Debugger is active
I/System.out: Debugger has connected
I/System.out: waiting for debugger to settle...
Connected to the target VM, address: 'localhost:8600', transport: 'socket'
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: debugger has settled (1427)
I/MultiDex: VM with version 1.6.0 does not have multidex support
I/MultiDex: install
I/MultiDex: MultiDexExtractor.load(/data/app/com.example.jina.a1105gmdemo-19.apk, false)
I/MultiDex: loading existing secondary dex files
I/MultiDex: load found 1 secondary dex files
I/MultiDex: install done
I/FirebaseInitProvider: FirebaseApp initialization unsuccessful
D/dalvikvm: threadid=1: still suspended after undo (sc=1 dc=1)
Disconnected from the target VM, address: 'localhost:8600', transport: 'socket'
当我调试选择其他点时，我得到了这样的日志。
I/Adreno-EGL: <qeglDrvAPI_eglInitialize:410>: EGL 1.4 QUALCOMM build: ()
OpenGL ES Shader Compiler Version: E031.24.00.08
Build Date: 03/21/14 Fri
Local Branch: AU200+patches_03212014
Remote Branch:
Local Patches:
Reconstruct Branch:
D/OpenGLRenderer: Enabling debug mode 0
D/OpenGLRenderer: GL error from OpenGLRenderer: 0x502
E/OpenGLRenderer: GL_INVALID_OPERATION
+ 这是背景代码
public class BackgroundTask extends AsyncTask<String,Void,String> {
AlertDialog alertDialog;
Context ctx;
BackgroundTask(Context ctx) {
this.ctx = ctx;
}
@Override
protected void onPreExecute() {
// alertDialog = new AlertDialog.Builder(ctx).create();
// alertDialog.setTitle("Login Information");
// alertDialog.setMessage("Login success");
}
@Override
protected String doInBackground(String... params) {
String reg_url = "http://35.160.135.119/webapp/register.php";
String login_url = "http://35.160.135.119/webapp/login.php";
String method = params[0];
if (method.equals("register")) {
String name = params[1];
String user_name = params[2];
String user_pass = params[3];
try {
URL url = new URL(reg_url);
final String COOKIES_HEADER = "Set-Cookie"; // stackoverflow
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
java.net.CookieManager msCookieManager = new java.net.CookieManager();
Map<String, List<String>> headerFields = httpURLConnection.getHeaderFields();
List<String> cookiesHeader = headerFields.get(COOKIES_HEADER);
if ( cookiesHeader != null) {
for (String cookie : cookiesHeader) {
msCookieManager.getCookieStore().add(null, HttpCookie.parse(cookie).get(0));
}
}
if (msCookieManager.getCookieStore().getCookies().size() > 0) {
// While joining the Cookies, use ',' or ';' as needed. Most of the servers are using ';'
httpURLConnection.setRequestProperty("Cookie",
TextUtils.join(";", msCookieManager.getCookieStore().getCookies()));
}
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
//httpURLConnection.setDoInput(true);
OutputStream OS = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(OS, "UTF-8"));
String data = URLEncoder.encode("user", "UTF-8") + "=" + URLEncoder.encode(name, "UTF-8") + "&" +
URLEncoder.encode("user_name", "UTF-8") + "=" + URLEncoder.encode(user_name, "UTF-8") + "&" +
URLEncoder.encode("user_pass", "UTF-8") + "=" + URLEncoder.encode(user_pass, "UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
OS.close();
InputStream IS = httpURLConnection.getInputStream();
IS.close();
//httpURLConnection.connect();
httpURLConnection.disconnect();
return "Registration Success...";
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} else if (method.equals("login")) {
String login_name = params[1];
String login_pass = params[2];
try {
URL url = new URL(login_url);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String data = URLEncoder.encode("login_name", "UTF-8") + "=" + URLEncoder.encode(login_name, "UTF-8") + "&" +
URLEncoder.encode("login_pass", "UTF-8") + "=" + URLEncoder.encode(login_pass, "UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
String response = "";
String line = "";
while ((line = bufferedReader.readLine()) != null) {
response += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return response;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(String result) {
if (result.equals("Registration Success...")) {
Toast.makeText(ctx, result, Toast.LENGTH_LONG).show();
} else {
alertDialog.setMessage(result);
alertDialog.show();
}
}
}
答案 0 :(得分：0)
在此方法userReg（View视图）中删除finish（）。实际上，您通过调用finish（）来完成活动。
public void userReg(View view)
{
name = ET_NAME.getText().toString();
user_name = ET_USER_NAME.getText().toString();
user_pass =ET_USER_PASS.getText().toString();
String method = "register";
BackgroundTask backgroundTask = new BackgroundTask(this);
backgroundTask.execute(method,name,user_name,user_pass);
//finish(); remove it
}
答案 1 :(得分：0)
我不确定这对你有帮助。但是有可能在>>> print dict
{'color': ['red','blue','green','yellow','orange','black','purple','pink']}
方法中得到NullPointerException，因为onPostExecute返回的参数result可以为null。翻转doInBackground表达式，然后重试。