Android学习笔记(6)——Android——LoginDemo

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. */
     @Override
     public 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 {
         @Override
         public void onClick(View v) {
             // TODO Auto-generated method stub
             if (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);
     }
 }

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. */
	@Override
	public 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 {
		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			if (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();

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         // TODO Auto-generated method stub

         super.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 {
         @Override
         public void onClick(View v) {
             // TODO Auto-generated method stub
             if (v.getId() == R.id.btn_login) {

                 // do login...

             } else if (v.getId() == R.id.btn_reset) {
                 finish();
             }
         }
     }
 }

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();

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub

		super.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 {
		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			if (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 ;
     }
 }

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

  "1.0"  encoding= "utf-8" ?>
 "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" >
     "@+id/btn_go"  android:layout_width= "wrap_content"
         android:layout_height="wrap_content"  android:text= "@string/txt_btn_go"  />

 

   login.xml程序清单

  "1.0"  encoding= "utf-8" ?>
 "http://schemas.android.com/apk/res/android"
     android:orientation="vertical"  android:layout_width= "fill_parent"
     android:layout_height="fill_parent" >

     "horizontal"
         android:layout_width="fill_parent"  android:layout_height= "wrap_content" >

         "fill_parent"
             android:layout_height="wrap_content"  android:text= "@string/txt_username"  />

         "@+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=""  />


     "horizontal"
         android:layout_width="fill_parent"  android:layout_height= "wrap_content" >

         "fill_parent"
             android:layout_height="wrap_content"  android:text= "@string/txt_passwd"  />

         "@+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=""  />

     "horizontal"
         android:layout_width="fill_parent"  android:layout_height= "wrap_content" >

         "@+id/btn_login"  android:layout_width= "fill_parent"
             android:layout_height="wrap_content"  android:layout_weight= "1.0"
             android:text="@string/txt_btn_login"  />

         "@+id/btn_reset"  android:layout_width= "fill_parent"
             android:layout_height="wrap_content"  android:layout_weight= "1.0"
             android:text="@string/txt_btn_reset"  />

 

   string.xml程序清单

  "1.0"  encoding= "utf-8" ?>

     "app_name" >LoginDemo
     "txt_btn_go" >Go...

     "app_login" >登录
     "txt_username" >用户名:
     "txt_passwd" >密 码:
     "txt_btn_login" >登 录
     "txt_btn_reset" >取 消

	LoginDemo
	Go...

	登录
	用户名:
	密 码:
	登 录
	取 消

 

   AndroidManifest.xml程序清单

  "1.0"  encoding= "utf-8" ?>
 "http://schemas.android.com/apk/res/android"
     package="com.oristand"  android:versionCode= "1"  android:versionName= "1.0.0" >
     "@drawable/icon"  android:label= "@string/app_name" >
         ".LoginDemoActivity"  android:label= "@string/app_name" >

                 "android.intent.action.MAIN"  />
                 "android.intent.category.LAUNCHER"  />



         ".LoginActivity"  android:label= "@string/app_login" >

 

   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

...

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运行效果：