安卓作业3_5的实现

activit_main.java

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

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="打开普通对话框"
        android:textSize="20sp"
         />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/button2"
        android:text="打开输入对话框"
        android:textSize="20sp"
        />
</LinearLayout>

login.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/user"
        android:text="用户名"
        android:textSize="18sp"/>
    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/userEdit"
        android:textSize="18sp"/>
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="密码"
        android:textSize="18sp"/>
    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/paswdEdit"
        android:textSize="18sp"/>

</LinearLayout>

MainActivity.java

package com.example.ex3_5;

import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    ProgressDialog mydialog;
    Button btn1,btn2;
    LinearLayout login;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn1=(Button)findViewById(R.id.button1);
        btn2=(Button)findViewById(R.id.button2);
        btn1.setOnClickListener(new mClick());
        btn2.setOnClickListener(new mClick());
    }
    class mClick implements View.OnClickListener{
        Builder dialog=new AlertDialog.Builder(MainActivity.this);
        @Override
        public void onClick(View arg0){
            if(arg0==btn1){
                dialog.setTitle("警告");
                dialog.setIcon(R.drawable.icon1);
                dialog.setMessage("本操作可能导致信息泄露!");
                dialog.setPositiveButton("确定",new okClick());
                dialog.create();
                dialog.show();
            }
            else if(arg0==btn2){
                login=(LinearLayout)getLayoutInflater().inflate(R.layout.login,null);
                dialog.setTitle("用户登录").setMessage("请输入用户名和密码").setView(login);
                dialog.setPositiveButton("确定",new loginClick());
                dialog.setNegativeButton("退出",new exitClick());
                dialog.setIcon(R.drawable.icon2);
                dialog.create();
                dialog.show();
            }
        }
    }
    class okClick implements DialogInterface.OnClickListener{
        @Override
        public void onClick(DialogInterface dialog,int which){
            dialog.cancel();
        }
    }
    class loginClick implements DialogInterface.OnClickListener{
        EditText txt;
        @Override
        public void onClick(DialogInterface dialog,int which){
            txt=(EditText)login.findViewById(R.id.paswdEdit);
            if(txt.getText().toString().equals("admin"))
                Toast.makeText(getApplicationContext(), "登录成功", Toast.LENGTH_SHORT).show();
            else
                Toast.makeText(getApplicationContext(),"密码错误",Toast.LENGTH_SHORT).show();
            dialog.dismiss();

        }
    }
    class exitClick implements DialogInterface.OnClickListener{
        @Override
        public void onClick(DialogInterface dialog, int which){
            MainActivity.this.finish();
        }
    }
}