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  • Android 登陆功能实现

      1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  2 xmlns:custom="http://schemas.android.com/apk/res-auto"
  3 android:layout_width="fill_parent"
  4 android:layout_height="fill_parent"
  5 android:fitsSystemWindows="true" > 
  6 <RelativeLayout 
  7 android:id="@+id/login_layout"
  8 android:layout_width="fill_parent"
  9 android:layout_height="wrap_content"
 10 android:layout_marginLeft="20dp"
 11 android:layout_marginRight="20dp"
 12 android:gravity="center" > 
 13 <FrameLayout 
 14 android:id="@+id/username_layout"
 15 android:layout_width="fill_parent"
 16 android:layout_height="wrap_content"
 17 android:layout_marginTop="55dp"
 18 android:gravity="center" > 
 19 <!-- android:inputType="number" --> 
 20 <EditText 
 21 android:id="@+id/username"
 22 android:layout_width="fill_parent"
 23 android:layout_height="40dp"
 24 android:layout_marginTop="5dp"
 25 android:maxLength="20"
 26 android:paddingLeft="55dp"
 27 android:paddingRight="60dp" > 
 28 </EditText> 
 29 <ImageView 
 30 android:layout_width="22dp"
 31 android:layout_height="21dp"
 32 android:layout_gravity="left|center_vertical"
 33 android:layout_marginStart="10dp"
 34 android:background="@drawable/username"
 35 android:visibility="visible" /> 
 36 <TextView 
 37 android:id="@+id/contry_sn"
 38 android:layout_width="40dp"
 39 android:layout_height="50dp"
 40 android:layout_gravity="left|center_vertical"
 41 android:layout_marginTop="4dp"
 42 android:gravity="center"
 43 android:text="+62"
 44 android:textColor="@android:color/black"
 45 android:textSize="18sp"
 46 android:visibility="invisible" /> 
 47 <Button 
 48 android:id="@+id/bt_username_clear"
 49 android:layout_width="35dp"
 50 android:layout_height="35dp"
 51 android:layout_gravity="right|center_vertical"
 52 android:layout_marginRight="10dp"
 53 android:background="@drawable/email_delete_pressed"
 54 android:visibility="invisible" /> 
 55 </FrameLayout> 
 56 <FrameLayout 
 57 android:id="@+id/usercode_layout"
 58 android:layout_width="fill_parent"
 59 android:layout_height="wrap_content"
 60 android:layout_below="@id/username_layout"
 61 android:layout_marginTop="6dp"
 62 android:gravity="center" > 
 63 <EditText 
 64 android:id="@+id/password"
 65 android:layout_width="fill_parent"
 66 android:layout_height="40dp"
 67 android:inputType="textPassword"
 68 android:maxLength="20"
 69 android:paddingLeft="55dp"
 70 android:paddingRight="60dp" > 
 71 </EditText> 
 72 <ImageView 
 73 android:layout_width="18dp"
 74 android:layout_height="21dp"
 75 android:layout_gravity="left|center_vertical"
 76 android:layout_marginStart="10dp"
 77 android:background="@drawable/password" /> 
 78 <Button 
 79 android:id="@+id/bt_pwd_eye"
 80 android:layout_width="40dp"
 81 android:layout_height="40dp"
 82 android:layout_gravity="right|center_vertical"
 83 android:layout_marginRight="10dp"
 84 android:background="@drawable/password_close" /> 
 85 <Button 
 86 android:id="@+id/bt_pwd_clear"
 87 android:layout_width="35dp"
 88 android:layout_height="35dp"
 89 android:layout_gravity="right|center_vertical"
 90 android:layout_marginRight="45dp"
 91 android:background="@drawable/email_delete_pressed"
 92 android:visibility="invisible" /> 
 93 </FrameLayout> 
 94 <Button 
 95 android:id="@+id/login"
 96 android:layout_width="fill_parent"
 97 android:layout_height="40dp"
 98 android:layout_below="@id/usercode_layout"
 99 android:layout_marginTop="30dp"
100 android:background="@drawable/login_selector"
101 android:gravity="center"
102 android:text="登录"
103 android:textColor="@android:color/white" /> 
104 <Button 
105 android:id="@+id/forgive_pwd"
106 android:layout_width="wrap_content"
107 android:layout_height="wrap_content"
108 android:layout_alignRight="@id/login"
109 android:layout_below="@id/login"
110 android:background="#00000000"
111 android:text="忘记密码?"
112 android:textColor="@drawable/text_color_selector"
113 android:textSize="16sp" /> 
114 <Button 
115 android:id="@+id/register"
116 android:layout_width="wrap_content"
117 android:layout_height="wrap_content"
118 android:layout_alignLeft="@id/login"
119 android:layout_below="@id/login"
120 android:background="#00000000"
121 android:gravity="left|center_vertical"
122 android:text="注册"
123 android:textColor="@drawable/text_color_selector"
124 android:textSize="16sp"
125 android:visibility="visible" /> 
126 </RelativeLayout> 
127 </RelativeLayout>

    MainActivity如下：

      1 package com.example.logindemo; 
  2 import android.support.v7.app.ActionBarActivity; 
  3 import android.text.Editable; 
  4 import android.text.TextWatcher; 
  5 import android.text.method.HideReturnsTransformationMethod; 
  6 import android.text.method.PasswordTransformationMethod; 
  7 import android.view.View; 
  8 import android.view.View.OnClickListener; 
  9 import android.widget.Button; 
 10 import android.widget.EditText; 
 11 import android.widget.Toast; 
 12 import android.os.Bundle; 
 13 /** 
 14 * 登录界面Demo 
 15 * 
 16 * @author ZHY 
 17 * 
 18 */
 19 public class MainActivity extends ActionBarActivity implements OnClickListener { 
 20 private EditText username, password; 
 21 private Button bt_username_clear; 
 22 private Button bt_pwd_clear; 
 23 private Button forgive_pwd; 
 24 private Button bt_pwd_eye; 
 25 private Button login; 
 26 private Button register; 
 27 private boolean isOpen = false; 
 28 @Override
 29 protected void onCreate(Bundle savedInstanceState) { 
 30 super.onCreate(savedInstanceState); 
 31 setContentView(R.layout.activity_main); 
 32 initView(); 
 33 } 
 34 private void initView() { 
 35 username = (EditText) findViewById(R.id.username); 
 36 // 监听文本框内容变化 
 37 username.addTextChangedListener(new TextWatcher() { 
 38 @Override
 39 public void onTextChanged(CharSequence s, int start, int before, 
 40 int count) { 
 41 // 获得文本框中的用户 
 42 String user = username.getText().toString().trim(); 
 43 if ("".equals(user)) { 
 44 // 用户名为空,设置按钮不可见 
 45 bt_username_clear.setVisibility(View.INVISIBLE); 
 46 } else { 
 47 // 用户名不为空，设置按钮可见 
 48 bt_username_clear.setVisibility(View.VISIBLE); 
 49 } 
 50 } 
 51 @Override
 52 public void beforeTextChanged(CharSequence s, int start, int count, 
 53 int after) { 
 54 } 
 55 @Override
 56 public void afterTextChanged(Editable s) { 
 57 } 
 58 }); 
 59 password = (EditText) findViewById(R.id.password); 
 60 // 监听文本框内容变化 
 61 password.addTextChangedListener(new TextWatcher() { 
 62 @Override
 63 public void onTextChanged(CharSequence s, int start, int before, 
 64 int count) { 
 65 // 获得文本框中的用户 
 66 String pwd = password.getText().toString().trim(); 
 67 if ("".equals(pwd)) { 
 68 // 用户名为空,设置按钮不可见 
 69 bt_pwd_clear.setVisibility(View.INVISIBLE); 
 70 } else { 
 71 // 用户名不为空，设置按钮可见 
 72 bt_pwd_clear.setVisibility(View.VISIBLE); 
 73 } 
 74 } 
 75 @Override
 76 public void beforeTextChanged(CharSequence s, int start, int count, 
 77 int after) { 
 78 } 
 79 @Override
 80 public void afterTextChanged(Editable s) { 
 81 } 
 82 }); 
 83 bt_username_clear = (Button) findViewById(R.id.bt_username_clear); 
 84 bt_username_clear.setOnClickListener(this); 
 85 bt_pwd_clear = (Button) findViewById(R.id.bt_pwd_clear); 
 86 bt_pwd_clear.setOnClickListener(this); 
 87  
 88 bt_pwd_eye = (Button) findViewById(R.id.bt_pwd_eye); 
 89 bt_pwd_eye.setOnClickListener(this); 
 90 login = (Button) findViewById(R.id.login); 
 91 login.setOnClickListener(this); 
 92 egister = (Button) findViewById(R.id.register); 
 93 register.setOnClickListener(this); 
 94 forgive_pwd = (Button) findViewById(R.id.forgive_pwd); 
 95 forgive_pwd.setOnClickListener(this); 
 96 } 
 97 @Override
 98 public void onClick(View v) { 
 99 switch (v.getId()) { 
100 case R.id.bt_username_clear: 
101 // 清除登录名 
102 username.setText(""); 
103 break; 
104 case R.id.bt_pwd_clear: 
105 // 清除密码 
106 password.setText(""); 
107 break; 
108 case R.id.bt_pwd_eye: 
109 // 密码可见与不可见的切换 
110 if (isOpen) { 
111 isOpen = false; 
112 } else { 
113 isOpen = true; 
114 } 
115 // 默认isOpen是false,密码不可见 
116 changePwdOpenOrClose(isOpen); 
117 break; 
118 case R.id.login: 
119 // TODO 登录按钮 
120 break; 
121 case R.id.register: 
122 // 注册按钮 
123 Toast.makeText(MainActivity.this, "注册", 0).show(); 
124 break; 
125 case R.id.forgive_pwd: 
126 // 忘记密码按钮 
127 Toast.makeText(MainActivity.this, "忘记密码", 0).show(); 
128 break; 
129 default: 
130 break; 
131 } 
132 } 
133 /** 
134 * 密码可见与不可见的切换 
135 * 
136 * @param flag 
137 */
138 private void changePwdOpenOrClose(boolean flag) { 
139 // 第一次过来是false，密码不可见 
140 if (flag) { 
141 // 密码可见 
142 bt_pwd_eye.setBackgroundResource(R.drawable.password_open); 
143 // 设置EditText的密码可见 
144 password.setTransformationMethod(HideReturnsTransformationMethod 
145 .getInstance()); 
146 } else { 
147 // 密码不接见 
148 bt_pwd_eye.setBackgroundResource(R.drawable.password_close); 
149 // 设置EditText的密码隐藏 
150 password.setTransformationMethod(PasswordTransformationMethod 
151 .getInstance()); 
152 } 
153 } 
154 }
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:custom="http://schemas.android.com/apk/res-auto"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:fitsSystemWindows="true" >
    <RelativeLayout
    android:id="@+id/login_layout"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"
    android:gravity="center" >
    <FrameLayout
    android:id="@+id/username_layout"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="55dp"
    android:gravity="center" >
    <!-- android:inputType="number" -->
    <EditText
    android:id="@+id/username"
    android:layout_width="fill_parent"
    android:layout_height="40dp"
    android:layout_marginTop="5dp"
    android:maxLength="20"
    android:paddingLeft="55dp"
    android:paddingRight="60dp" >
    </EditText>
    <ImageView
    android:layout_width="22dp"
    android:layout_height="21dp"
    android:layout_gravity="left|center_vertical"
    android:layout_marginStart="10dp"
    android:background="@drawable/username"
    android:visibility="visible" />
    <TextView
    android:id="@+id/contry_sn"
    android:layout_width="40dp"
    android:layout_height="50dp"
    android:layout_gravity="left|center_vertical"
    android:layout_marginTop="4dp"
    android:gravity="center"
    android:text="+62"
    android:textColor="@android:color/black"
    android:textSize="18sp"
    android:visibility="invisible" />
    <Button
    android:id="@+id/bt_username_clear"
    android:layout_width="35dp"
    android:layout_height="35dp"
    android:layout_gravity="right|center_vertical"
    android:layout_marginRight="10dp"
    android:background="@drawable/email_delete_pressed"
    android:visibility="invisible" />
    </FrameLayout>
    <FrameLayout
    android:id="@+id/usercode_layout"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_below="@id/username_layout"
    android:layout_marginTop="6dp"
    android:gravity="center" >
    <EditText
    android:id="@+id/password"
    android:layout_width="fill_parent"
    android:layout_height="40dp"
    android:inputType="textPassword"
    android:maxLength="20"
    android:paddingLeft="55dp"
    android:paddingRight="60dp" >
    </EditText>
    <ImageView
    android:layout_width="18dp"
    android:layout_height="21dp"
    android:layout_gravity="left|center_vertical"
    android:layout_marginStart="10dp"
    android:background="@drawable/password" />
    <Button
    android:id="@+id/bt_pwd_eye"
    android:layout_width="40dp"
    android:layout_height="40dp"
    android:layout_gravity="right|center_vertical"
    android:layout_marginRight="10dp"
    android:background="@drawable/password_close" />
    <Button
    android:id="@+id/bt_pwd_clear"
    android:layout_width="35dp"
    android:layout_height="35dp"
    android:layout_gravity="right|center_vertical"
    android:layout_marginRight="45dp"
    android:background="@drawable/email_delete_pressed"
    android:visibility="invisible" />
    </FrameLayout>
    <Button
    android:id="@+id/login"
    android:layout_width="fill_parent"
    android:layout_height="40dp"
    android:layout_below="@id/usercode_layout"
    android:layout_marginTop="30dp"
    android:background="@drawable/login_selector"
    android:gravity="center"
    android:text="登录"
    android:textColor="@android:color/white" />
    <Button
    android:id="@+id/forgive_pwd"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignRight="@id/login"
    android:layout_below="@id/login"
    android:background="#00000000"
    android:text="忘记密码?"
    android:textColor="@drawable/text_color_selector"
    android:textSize="16sp" />
    <Button
    android:id="@+id/register"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@id/login"
    android:layout_below="@id/login"
    android:background="#00000000"
    android:gravity="left|center_vertical"
    android:text="注册"
    android:textColor="@drawable/text_color_selector"
    android:textSize="16sp"
    android:visibility="visible" />
    </RelativeLayout>
    </RelativeLayout>

    MainActivity如下：

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    package com.example.logindemo;
    import android.support.v7.app.ActionBarActivity;
    import android.text.Editable;
    import android.text.TextWatcher;
    import android.text.method.HideReturnsTransformationMethod;
    import android.text.method.PasswordTransformationMethod;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.Toast;
    import android.os.Bundle;
    /**
    * 登录界面Demo
    *
    * @author ZHY
    *
    */
    public class MainActivity extends ActionBarActivity implements OnClickListener {
    private EditText username, password;
    private Button bt_username_clear;
    private Button bt_pwd_clear;
    private Button forgive_pwd;
    private Button bt_pwd_eye;
    private Button login;
    private Button register;
    private boolean isOpen = false;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    initView();
    }
    private void initView() {
    username = (EditText) findViewById(R.id.username);
    // 监听文本框内容变化
    username.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence s, int start, int before,
    int count) {
    // 获得文本框中的用户
    String user = username.getText().toString().trim();
    if ("".equals(user)) {
    // 用户名为空,设置按钮不可见
    bt_username_clear.setVisibility(View.INVISIBLE);
    } else {
    // 用户名不为空，设置按钮可见
    bt_username_clear.setVisibility(View.VISIBLE);
    }
    }
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,
    int after) {
    }
    @Override
    public void afterTextChanged(Editable s) {
    }
    });
    password = (EditText) findViewById(R.id.password);
    // 监听文本框内容变化
    password.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence s, int start, int before,
    int count) {
    // 获得文本框中的用户
    String pwd = password.getText().toString().trim();
    if ("".equals(pwd)) {
    // 用户名为空,设置按钮不可见
    bt_pwd_clear.setVisibility(View.INVISIBLE);
    } else {
    // 用户名不为空，设置按钮可见
    bt_pwd_clear.setVisibility(View.VISIBLE);
    }
    }
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,
    int after) {
    }
    @Override
    public void afterTextChanged(Editable s) {
    }
    });
    bt_username_clear = (Button) findViewById(R.id.bt_username_clear);
    bt_username_clear.setOnClickListener(this);
    bt_pwd_clear = (Button) findViewById(R.id.bt_pwd_clear);
    bt_pwd_clear.setOnClickListener(this);
     
    bt_pwd_eye = (Button) findViewById(R.id.bt_pwd_eye);
    bt_pwd_eye.setOnClickListener(this);
    login = (Button) findViewById(R.id.login);
    login.setOnClickListener(this);
    egister = (Button) findViewById(R.id.register);
    register.setOnClickListener(this);
    forgive_pwd = (Button) findViewById(R.id.forgive_pwd);
    forgive_pwd.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
    switch (v.getId()) {
    case R.id.bt_username_clear:
    // 清除登录名
    username.setText("");
    break;
    case R.id.bt_pwd_clear:
    // 清除密码
    password.setText("");
    break;
    case R.id.bt_pwd_eye:
    // 密码可见与不可见的切换
    if (isOpen) {
    isOpen = false;
    } else {
    isOpen = true;
    }
    // 默认isOpen是false,密码不可见
    changePwdOpenOrClose(isOpen);
    break;
    case R.id.login:
    // TODO 登录按钮
    break;
    case R.id.register:
    // 注册按钮
    Toast.makeText(MainActivity.this, "注册", 0).show();
    break;
    case R.id.forgive_pwd:
    // 忘记密码按钮
    Toast.makeText(MainActivity.this, "忘记密码", 0).show();
    break;
    default:
    break;
    }
    }
    /**
    * 密码可见与不可见的切换
    *
    * @param flag
    */
    private void changePwdOpenOrClose(boolean flag) {
    // 第一次过来是false，密码不可见
    if (flag) {
    // 密码可见
    bt_pwd_eye.setBackgroundResource(R.drawable.password_open);
    // 设置EditText的密码可见
    password.setTransformationMethod(HideReturnsTransformationMethod
    .getInstance());
    } else {
    // 密码不接见
    bt_pwd_eye.setBackgroundResource(R.drawable.password_close);
    // 设置EditText的密码隐藏
    password.setTransformationMethod(PasswordTransformationMethod
    .getInstance());
    }
    }
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  • 原文地址：https://www.cnblogs.com/ztca/p/8534065.html
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