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

<?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>

<?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>

<?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>

<?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>

<?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：