Android——用对话框做登陆界面

效果：

1.点击图标进入页面二

2.页面2图片暂停显示5秒进入页面三

3.点击页面三登陆按钮，打开登陆对话框，输入密码进入页面四

点击下载按钮，显示水平进度条

MainActivity.java

package com.example.chenshuai.test404;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void onclick(View view)
    {
        Intent intent = new Intent(this,Activity1.class);
        startActivity(intent);
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.chenshuai.test404.MainActivity">

   <ImageButton
       android:layout_width="90dp"
       android:layout_height="90dp"
       android:src="@drawable/logo"
       android:onClick="onclick"/>
</RelativeLayout>

Activity1.java

package com.example.chenshuai.test404;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

import java.util.Timer;
import java.util.TimerTask;

/**
 * Created by chenshuai on 2016/4/3.
 */
public class Activity1 extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity1_layout);

        //图片暂停5秒后显示
        final Intent it = new Intent(this, Activity2.class); //你要转向的Activity
        Timer timer = new Timer();
        TimerTask task = new TimerTask() {
            @Override
            public void run() {
                startActivity(it); //执行
            }
        };
        timer.schedule(task, 1000 * 5); //5秒后

    }
}

activity1_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/denglu"/>

</LinearLayout>

Activity2.java

package com.example.chenshuai.test404;

import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

/**
 * Created by chenshuai on 2016/4/3.
 */
public class Activity2 extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity2_layout);

    }

    public void onclik1(View view)
    {

        //获取加载器
        LayoutInflater layoutInflater = getLayoutInflater();
        //加载layout文件
        View vi_1 = layoutInflater.inflate(R.layout.login_layout,null);
        //添加按钮
        new AlertDialog.Builder(this)
                .setView(vi_1)
                .setNegativeButton("取消", null)
                .setPositiveButton("登陆", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                        AlertDialog al = (AlertDialog) dialog;

                        EditText pwd = (EditText) al.findViewById(R.id.pwd);

                        String str = pwd.getText().toString();

                        if (str.equals("123")) {
                            Intent intent = new Intent(Activity2.this, Activity3.class);
                            startActivity(intent);
                        } else {
                            Toast.makeText(Activity2.this, "密码错误！", Toast.LENGTH_SHORT).show();
                        }

                    }
                })
                .show();
    }
    public void onclick2(View v)
    {
        final ProgressDialog pd = new ProgressDialog(this);
        pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

        pd.setMessage("下载进度");
        pd.show();

        //创建thread实例  重写run方法  启动多线程
        new Thread()
        {
            @Override
            public void run() {
                super.run();
                for (int i = 0;i<=pd.getMax();i++)
                {
                    try {
                        Thread.sleep(100);
                    }catch (Exception e)
                    {}
                    pd.setProgress(i);
                }
                pd.dismiss();
            }
        }.start();
    }

}

activity2_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/anniu1"
        android:text="点击登陆"
        android:textSize="20dp"
        android:onClick="onclik1"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/anniu2"
        android:text="点击下载文件"
        android:textSize="20dp"
        android:onClick="onclick2"
        />

</LinearLayout>

login_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <ImageView
        android:layout_width="90dp"
        android:layout_height="90dp"
        android:src="@drawable/touxiang"
        android:layout_marginTop="100dp"
        android:layout_gravity="center_horizontal"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="15275969278"
        android:textSize="20dp"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="10dp"
        />
    <EditText
        android:layout_width="350dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:hint="请填写密码"
       android:inputType="textPassword"
        android:drawableLeft="@drawable/suo1"
        android:layout_marginTop="20dp"
        android:id="@+id/pwd"
     />

</LinearLayout>

Activity3.java

package com.example.chenshuai.test404;

import android.app.Activity;
import android.os.Bundle;

/**
 * Created by chenshuai on 2016/4/4.
 */
public class Activity3 extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity3_layout);
    }
}

activity3_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/yemian"/>

</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.chenshuai.test404">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".Activity1">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
        <activity android:name=".Activity2">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
        <activity android:name=".Activity3">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>

</manifest>