Android学习笔记(6)——Android——LoginDemo

deyinchan

在这个demo中，将涉及到Activity(活动)的交互——从一个屏幕到另一个屏幕，通过Intent来实现的……
 
工程目录结构:

 
    LoginDemoActivity程序清单
package com.oristand;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;public class LoginDemoActivity extends Activity {// 点击go按钮，进入登录活动(LoginActivity)private Button btn_go;// 按钮添加监听事件private BtnListener btnListener = new BtnListener();/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);// 丛当前试图中找到按钮，初始化btn_go = (Button) findViewById(R.id.btn_go);// 绑定点击事件btn_go.setOnClickListener(btnListener);}// 监听事件private class BtnListener implements View.OnClickListener {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubif (v.getId() == R.id.btn_go) {login();}}}                // 通过Intent实现跳转public void login() {Intent intent_login = new Intent();intent_login.setClass(this, LoginActivity.class);startActivity(intent_login);}} 
    LoginActivity.java程序清单
package com.oristand;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;public class LoginActivity extends Activity {// 用户名输入框private EditText et_username;// 密码输入框private EditText et_passwd;// 登录按钮private Button btn_login;// 取消按钮Button btn_reset;// 按钮添加点击事件BtnListener btnListener = new BtnListener();@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);// 设置当前视图setContentView(R.layout.login);// 从当前事件中找到输入框，初始化et_username = (EditText) findViewById(R.id.et_username);et_passwd = (EditText) findViewById(R.id.et_passwd);// 从当前事件中找到登录按钮，初始化btn_login = (Button) findViewById(R.id.btn_login);btn_login.setOnClickListener(btnListener);// ...btn_reset = (Button) findViewById(R.id.btn_reset);btn_reset.setOnClickListener(btnListener);}// 点击事件private class BtnListener implements View.OnClickListener {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubif (v.getId() == R.id.btn_login) {// do login...} else if (v.getId() == R.id.btn_reset) {finish();}}}} 
  R.java程序清单
package com.oristand;public final class R {    public static final class attr {    }    public static final class drawable {        public static final int icon=0x7f020000;    }    public static final class id {        public static final int btn_go=0x7f050004;        public static final int btn_login=0x7f050002;        public static final int btn_reset=0x7f050003;        public static final int et_passwd=0x7f050001;        public static final int et_username=0x7f050000;    }    public static final class layout {        public static final int login=0x7f030000;        public static final int main=0x7f030001;    }    public static final class string {        public static final int app_login=0x7f040002;        public static final int app_name=0x7f040000;        public static final int txt_btn_go=0x7f040001;        public static final int txt_btn_login=0x7f040005;        public static final int txt_btn_reset=0x7f040006;        public static final int txt_passwd=0x7f040004;        public static final int txt_username=0x7f040003;    }} 
   main.xml程序清单
<?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" android:gravity="center_vertical|center_horizontal"><Button android:id="@+id/btn_go" android:layout_width="wrap_content"android:layout_height="wrap_content" android:text="@string/txt_btn_go" /></LinearLayout> 
   login.xml程序清单
<?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"><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/txt_username" /><EditText android:id="@+id/et_username" 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/txt_passwd" /><EditText android:id="@+id/et_passwd" 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/btn_login" android:layout_width="fill_parent"android:layout_height="wrap_content" android:layout_weight="1.0"android:text="@string/txt_btn_login" /><Button android:id="@+id/btn_reset" android:layout_width="fill_parent"android:layout_height="wrap_content" android:layout_weight="1.0"android:text="@string/txt_btn_reset" /></LinearLayout></TableLayout> 
   string.xml程序清单
<?xml version="1.0" encoding="utf-8"?><resources><string name="app_name">LoginDemo</string><string name="txt_btn_go">Go...</string><string name="app_login">登录</string><string name="txt_username">用户名:</string><string name="txt_passwd">密 码:</string><string name="txt_btn_login">登 录</string><string name="txt_btn_reset">取 消</string></resources>  
   AndroidManifest.xml程序清单
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.oristand" android:versionCode="1" android:versionName="1.0.0"><application android:icon="@drawable/icon" android:label="@string/app_name"><activity android:name=".LoginDemoActivity" android:label="@string/app_name"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity><!-- login activity --><activity android:name=".LoginActivity" android:label="@string/app_login"></activity></application></manifest>    
   程序运行配置：
 
default就可以……
AndroidManifest.xml中的配置可以知道答案……就相当与函数的入口是main方法一样
...
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
...
运行效果：