一个Android登陆的简单实现
在公司实习半个月了，上个星期开始接触Android，做了一个很简单的登陆实现。有三个Activity，一个是Login的Activity，一个是正确登陆后的Activity，最后一个是登陆错误后的Activity。其中registerButton没写，因为我还没看android.database这个包，以后我会慢慢的完善它。还有就是检测用户名和密码，用的是最最简陋的equals来判断的，还是因为我没看android.database，呵呵。我现在还是新手，如果哪里有写的不好的，或者是不完善的，请大家多多批评。谢谢大家！下面是全部代码。代码我上传到附件，欢迎下载。Login.java
package com.heji.login;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;public class Login extends Activity {/** Called when the activity is first created. */ private static Button loginButton;private static Button cancelButton;private static Button registerButton;private static Button exitButton; private ButtonListener bl = new ButtonListener(); private EditText et1; private EditText et2; private Intent intent;@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.login); //添加登陆按钮监听 loginButton = (Button)findViewById(R.id.login_ok); loginButton.setOnClickListener(bl); //添加取消按钮监听 cancelButton = (Button)findViewById(R.id.login_reset); cancelButton.setOnClickListener(bl); //添加注册按钮监听 registerButton = (Button)findViewById(R.id.register); registerButton.setOnClickListener(bl); //添加退出按钮监听 exitButton = (Button)findViewById(R.id.exit); exitButton.setOnClickListener(bl); } private class ButtonListener implements View.OnClickListener {public void onClick(View view) {// TODO Auto-generated method stubif(view == loginButton) {et1 = (EditText)findViewById(R.id.username_info);et2 = (EditText)findViewById(R.id.password_info); if((et1.getText().toString()).equals("heji") && (et2.getText().toString()).equals("heji")) {intent = new Intent();//用Bundle来传递当前Activity的内容Bundle bundle = new Bundle();bundle.putString("USERNAME", et1.getText().toString());intent.putExtras(bundle);intent.setClass(Login.this, Information.class);//启动ActivitystartActivity(intent);}else { intent = new Intent();intent.setClass(Login.this, ErrorPage.class);//启动ActivitystartActivity(intent);}}else if(view == cancelButton) {intent = new Intent();//通过Login这个类来启动Loginintent.setClass(Login.this, Login.class);//启动ActivitystartActivity(intent);}else if(view == registerButton) {}else if(view == exitButton) { finish();}} }}
Information.java(名字取得很不好，见谅)
package com.heji.login;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.TextView;public class Information extends Activity {protected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);//显示布局this.setContentView(R.layout.information);TextView tv = (TextView)findViewById(R.id.first_page_info);//获得从上个页面传过来的数据Bundle bundle = this.getIntent().getExtras();String str = bundle.getString("USERNAME");tv.setText(str);Button button_back = (Button)findViewById(R.id.back);button_back.setOnClickListener(new View.OnClickListener() {public void onClick(View view) {// TODO Auto-generated method stubIntent intent = new Intent();//通过Information这个类来启动Loginintent.setClass(Information.this, Login.class);//启动ActivitystartActivity(intent);}});}}
ErrorPage.java
package com.heji.login;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;public class ErrorPage extends Activity {protected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);//显示布局this.setContentView(R.layout.errorpage);Button button_back = (Button)findViewById(R.id.errorback);button_back.setOnClickListener(new View.OnClickListener() {public void onClick(View view) {// TODO Auto-generated method stubIntent intent = new Intent();//通过ErrorPage这个类来启动Loginintent.setClass(ErrorPage.this, Login.class);//启动ActivitystartActivity(intent);}});}}
下面是布局文件：
login.xml
<?xml version="1.0" encoding="utf-8"?><TableLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" ><TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/welcome_hello" /> <TableRow android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/username" /> <EditText android:id="@+id/username_info" android:maxLength="8" android:maxLines="1" android:layout_weight="1.0" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="" /> </TableRow> <TableRow android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/password" /> <EditText android:id="@+id/password_info" android:password="true" android:maxLength="10" android:maxLines="1" android:layout_weight="1.0" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="" /> </TableRow> <LinearLayout android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content"> <Button android:id="@+id/login_ok" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="1.0" android:text="@string/login" /> <Button android:id="@+id/login_reset" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="1.0" android:text="@string/reset" /> </LinearLayout> <LinearLayout android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content"> <Button android:id="@+id/register" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="1.0" android:text="@string/register" /> <Button android:id="@+id/exit" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="1.0" android:text="@string/exit" /> </LinearLayout> </TableLayout>
information.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/success_info" /> <TextViewandroid:id="@+id/first_page_info" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="" /> <Button android:id="@+id/back" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/back"/></LinearLayout>
errorpage.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/errorpage" /><Button android:id="@+id/errorback" android:layout_width="60dip" android:layout_height="wrap_content" android:text="@string/error_back" /></LinearLayout>
strings.xml
<?xml version="1.0" encoding="utf-8"?><resources> <string name="welcome_hello">Hello,Welcome To Login</string> <string name="app_name">Login</string> <string name="username">username</string> <string name="password">password</string> <string name="login">login</string> <string name="reset">reset</string> <string name="register">register</string> <string name="information">congratulation!</string> <string name="success_info">Hello Android Developer,You ID Is</string> <string name="errorpage">Sorry,You Don't Register,Please By The "BACK" Button To Return The FirstPage,Thank You!!!</string> <string name="error_back">BACK</string> <string name="back">BACK</string> <string name="exit">Exit</string></resources>
页:
[1]