Android学习之路——简易版微信为例（二）

  1 <?xml version="1.0" encoding="utf-8"?>
  2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3     android:layout_width="match_parent"
  4     android:layout_height="match_parent"
  5     android:orientation="vertical">
  6 
  7     <!--Top Panel-->
  8     <TextView
  9         android:layout_width="match_parent"
 10         android:layout_height="50dp"
 11         android:background="@color/colorTopPanelBackground"
 12         android:gravity="center"
 13         android:text="@string/string_login"
 14         android:textSize="@dimen/font_size_large"
 15         android:textColor="@color/colorSpecialWhite" />
 16 
 17     <LinearLayout
 18         android:layout_width="match_parent"
 19         android:layout_height="match_parent"
 20         android:layout_margin="@dimen/activity_horizontal_margin"
 21         android:orientation="vertical">
 22 
 23         <LinearLayout
 24             android:layout_width="match_parent"
 25             android:layout_height="50dip"
 26             android:orientation="horizontal"
 27             android:layout_marginTop="50dp">
 28 
 29             <TextView
 30                 android:layout_width="50dip"
 31                 android:layout_height="50dip"
 32                 android:gravity="center_vertical|right"
 33                 android:text="+86"
 34                 android:textColor="@color/colorSpecialBlack"
 35                 android:textSize="@dimen/font_size_medium" />
 36 
 37             <EditText
 38                 android:id="@+id/edt_login_cellphone_number"
 39                 android:layout_width="0dp"
 40                 android:layout_height="50dip"
 41                 android:layout_weight="1"
 42                 android:layout_marginLeft="25dp"
 43                 android:background="@null"
 44                 android:hint="你的手机号码"
 45                 android:textSize="@dimen/font_size_medium"
 46                 android:textColorHint="@color/colorHintText"/>
 47 
 48         </LinearLayout>
 49 
 50         <View
 51             android:id="@+id/dvd_login_username"
 52             android:layout_width="match_parent"
 53             android:layout_height="2px"
 54             android:background="@color/colorDefault" />
 55 
 56         <LinearLayout
 57             android:layout_width="match_parent"
 58             android:layout_height="50dip"
 59             android:orientation="horizontal">
 60 
 61             <TextView
 62                 android:layout_width="50dip"
 63                 android:layout_height="50dip"
 64                 android:gravity="center_vertical|right"
 65                 android:text="@string/string_pass_word"
 66                 android:textColor="@color/colorSpecialBlack"
 67                 android:textSize="@dimen/font_size_medium" />
 68 
 69             <EditText
 70                 android:id="@+id/edt_login_password"
 71                 android:layout_width="0dp"
 72                 android:layout_height="50dip"
 73                 android:layout_weight="1"
 74                 android:layout_marginLeft="25dp"
 75                 android:background="@null"
 76                 android:inputType="textPassword"
 77                 android:textSize="@dimen/font_size_medium"
 78                 android:hint="填入密码"
 79                 android:textColorHint="@color/colorHintText"/>
 80 
 81         </LinearLayout>
 82 
 83         <View
 84             android:id="@+id/dvd_login_password"
 85             android:layout_width="match_parent"
 86             android:layout_height="2px"
 87             android:background="@color/colorDefault" />
 88 
 89         <Button
 90             android:id="@+id/btn_login"
 91             android:layout_width="match_parent"
 92             android:layout_height="@dimen/button_general_height"
 93             android:layout_marginTop="50dip"
 94             android:background="@drawable/btn_common_selector"
 95             android:text="@string/string_login"
 96             android:textSize="@dimen/font_size_medium"
 97             android:textColor="@color/colorSpecialWhite"/>
 98 
 99         <Button
100             android:id="@+id/btn_register"
101             android:layout_width="match_parent"
102             android:layout_height="@dimen/button_general_height"
103             android:layout_marginTop="20dip"
104             android:background="@drawable/btn_implicit_selector"
105             android:text="@string/string_register"
106             android:textSize="@dimen/font_size_medium" />
107 
108     </LinearLayout>
109 
110 </LinearLayout>

 1 @Override
 2     protected void onCreate(Bundle savedInstanceState) {
 3         super.onCreate(savedInstanceState);
 4 
 5         setContentView(R.layout.activity_login);
 6 
 7         mLoginButton = (Button) findViewById(R.id.btn_login);
 8         mRegisterButton = (Button) findViewById(R.id.btn_register);
 9         mEditTextUserName = (EditText) findViewById(R.id.edt_login_cellphone_number);
10         mEditTextPassword = (EditText) findViewById(R.id.edt_login_password);
11         mDvdPassword = findViewById(R.id.dvd_login_password);
12         mDvdUserName = findViewById(R.id.dvd_login_username);
13 
14         mLoginButton.setOnClickListener(new View.OnClickListener() {
15             @Override
16             public void onClick(View v) {
17 
18                 Log.d("OnClick", "Enter the click callback of Login Button");
19 
20                 String cellphone_number = mEditTextUserName.getText().toString().trim();
21                 String pass_word        = mEditTextPassword.getText().toString().trim();
22 
23                 Map<String, String> params = new HashMap<String, String>();
24                 params.put("url", LOGIN_PATH);
25                 params.put("cellphone_number", cellphone_number);
26                 params.put("pass_word", pass_word);
27 
28                 new LoginAsyncTask(LoginActivity.this).execute(params);
29             }
30         });
31 
32         mRegisterButton.setOnClickListener(new View.OnClickListener() {
33             @Override
34             public void onClick(View v) {
35                 // Enter into the register activity
36                 Intent intent = new Intent(LoginActivity.this, RegisterActivity.class);
37                 startActivity(intent);
38             }
39         });
40 
41         mEditTextPassword.setOnFocusChangeListener(new View.OnFocusChangeListener() {
42             @Override
43             public void onFocusChange(View v, boolean hasFocus) {
44                 if (hasFocus) {
45                     mDvdPassword.setBackgroundColor(getResources().getColor(R.color.colorPrimary));
46                 } else {
47                     mDvdPassword.setBackgroundColor(getResources().getColor(R.color.colorDefault));
48                 }
49             }
50         });
51 
52         mEditTextUserName.setOnFocusChangeListener(new View.OnFocusChangeListener() {
53             @Override
54             public void onFocusChange(View v, boolean hasFocus) {
55                 if (hasFocus) {
56                     mDvdUserName.setBackgroundColor(getResources().getColor(R.color.colorPrimary));
57                 } else {
58                     mDvdUserName.setBackgroundColor(getResources().getColor(R.color.colorDefault));
59                 }
60             }
61         });
62     }

 1 public class LoginAsyncTask extends AsyncTask<Map<String, String>, Void, Boolean> {
 2 
 3     private ProgressDialog mDialog;
 4     private Context mContext;
 5 
 6     public LoginAsyncTask(Context context) {
 7         mDialog = new ProgressDialog(context);
 8         mDialog.setTitle("提示信息");
 9         mDialog.setMessage("正在登录，请稍等...");
10 
11         mContext = context;
12     }
13 
14     @Override
15     protected Boolean doInBackground(Map<String, String>... params) {
16         String url = params[0].get("url");
17 
18         Map<String, String> mapParams = new Hashtable();
19         for (Map.Entry<String, String> entry : params[0].entrySet()) {
20             if (!entry.getKey().equals("url")) {
21                 mapParams.put(entry.getKey(), entry.getValue());
22             }
23         }
24 
25         String result = null;
26         try {
27             result = HttpUtil.sendPostRequest(url, mapParams, "utf-8");
28         } catch (Exception e) {
29             e.printStackTrace();
30         }
31 
32         return result.equals("True") ? true : false;
33     }
34 
35     @Override
36     protected void onPostExecute(Boolean result) {
37         super.onPostExecute(result);
38         if (mDialog.isShowing())    mDialog.dismiss();
39         if (result) {
40             // jump to Main page
41             Intent intent = new Intent(mContext, MainActivity.class);
42             mContext.startActivity(intent);
43         } else {
44             Toast.makeText(mContext, "登录失败!", Toast.LENGTH_LONG).show();
45         }
46     }
47 }

 1 public class HttpUtil {
 2 
 3     public static String sendPostRequest(
 4             String path, Map<String, String> params, String encoding)
 5             throws Exception {
 6 
 7         StringBuilder sb = new StringBuilder();
 8         if (params != null && !params.isEmpty()) {
 9             for (Map.Entry<String, String> entry : params.entrySet()) {
10                 sb.append(entry.getKey()).append("=");
11                 sb.append(URLEncoder.encode(entry.getValue(), encoding));
12                 sb.append("&");
13             }
14             sb.deleteCharAt(sb.length() - 1);
15         }
16 
17         HttpURLConnection conn = (HttpURLConnection) new URL(path).openConnection();
18         conn.setConnectTimeout(5000);
19         conn.setRequestMethod("POST");
20         conn.setDoOutput(true);
21 
22         OutputStream os = conn.getOutputStream();
23         os.write(sb.toString().getBytes());
24         os.flush();
25 
26         if (conn.getResponseCode() == 200) {
27             String result = StreamTool.readStream(conn.getInputStream());
28             return result;
29         } else {
30             return null;
31         }
32     }
33 }

 1 public class StreamTool {
 2 
 3     public static String readStream(InputStream stream) throws IOException {
 4 
 5         StringBuilder sb = new StringBuilder();
 6         BufferedReader in = new BufferedReader(new InputStreamReader(stream));
 7 
 8         String line;
 9         while ((line = in.readLine()) != null) {
10             sb.append(line);
11             System.out.println("===>" + line);
12         }
13 
14         return sb.toString();
15     }
16 
17 }

 1 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 2         request.setCharacterEncoding("utf-8");
 3         response.setCharacterEncoding("utf-8");
 4         
 5         // parse parameters from client.
 6         String cellphone_number = request.getParameter("cellphone_number");
 7         String pass_word         = request.getParameter("pass_word");
 8         
 9         PrintWriter writer = response.getWriter();
10         
11         try {
12             UserDAOInterface userDAO = new UserDAOImpl();
13             User user = userDAO.queryByCellPhoneNumber(cellphone_number);
14             
15             if (user != null && user.getPassWord().equals(pass_word))
16             {
17                 writer.append("True");
18                 System.out.println("True");
19             }
20             else
21             {
22                 writer.append("False");
23                 System.out.println("False");
24             }
25         } catch (SQLException | ClassNotFoundException e) {
26             // TODO Auto-generated catch block
27             e.printStackTrace();
28         } finally {
29             
30         }
31     }