关于对话框的学习

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context="com.hanqi.test5.UIActivity2">
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="长按触发上下文菜单"
        android:id="@+id/bt_changan"/>
    <ProgressBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/pb_1"/>
    <ProgressBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        style="?android:attr/progressBarStyleHorizontal"
        android:max="100"
        android:progress="50"
        android:secondaryProgress="70"
        android:id="@+id/pb_2" /><!--max:最大值   progress:当前进度  secondaryProgress:第二进度值-->
    <!--<ProgressBar-->
        <!--android:layout_width="wrap_content"-->
        <!--android:layout_height="wrap_content"-->
        <!--style="@android:style/Widget.ProgressBar.Small"/>-->
    <!--<ProgressBar-->
        <!--android:layout_width="wrap_content"-->
        <!--android:layout_height="wrap_content"-->
        <!--style="@android:style/Widget.ProgressBar.Large"/>-->
    <!--<ProgressBar-->
        <!--android:layout_width="wrap_content"-->
        <!--android:layout_height="wrap_content"-->
        <!--style="@android:style/Widget.ProgressBar.Large.Inverse"/>-->
    <!--<ProgressBar-->
        <!--android:layout_width="wrap_content"-->
        <!--android:layout_height="wrap_content"-->
        <!--style="@android:style/Widget.ProgressBar.Inverse"/>&lt;!&ndash;不可拖动&ndash;&gt;-->
    <!--<Switch
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Switch"
        android:id="@+id/switch1"
        android:layout_gravity="center_horizontal" />
-->
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/vipflower"
        android:id="@+id/iv_vip"
        android:visibility="gone"/>
    <SeekBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="100"
        android:id="@+id/sb_1"/><!--可拖动-->
    <RatingBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:numStars="7"
        android:rating="3.5"
        android:isIndicator="true"/>
    <!--星星进度条 numStars:星星数目 rating:当前默认星级 isIndicator:是否允许修改星级：true为不可修改-->

    <Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="点击触发弹出普通对话框"
    android:onClick="pt_OnClick"
    />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="点击触发弹出单选对话框"
        android:onClick="dx_OnClick"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="点击触发弹出多选对话框"
        android:onClick="duox_OnClick"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="点击触发弹出自定义对话框"
        android:onClick="zdy_OnClick"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="点击触发弹出进度条对话框"
        android:onClick="jdt_OnClick"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="点击触发弹出水平进度条对话框"
        android:onClick="jdt1_OnClick"
        />
</LinearLayout>

package com.hanqi.test5;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.SubMenu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.SeekBar;
import android.widget.Toast;

public class UIActivity2 extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ui2);
        Button bt_changan = (Button)findViewById(R.id.bt_changan);
        bt_changan.setOnCreateContextMenuListener(this);/*this代表当前Activity,实现了这个接口*/

        //进度条
        //有final时，生命周期长，不加final的话就只是当前方法的，加final可以延长生命周期，或者定义成员变量
        final ProgressBar pb_1 =(ProgressBar)findViewById(R.id.pb_1);
        final ProgressBar pb_2 =(ProgressBar)findViewById(R.id.pb_2);
        final SeekBar sb_1 =(SeekBar)findViewById(R.id.sb_1);

        sb_1.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            //onProgressChanged进度条变化,进度改变就会触发
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                //pb_2.setProgress(seekBar.getProgress());
                ImageView iv_vip = (ImageView)findViewById(R.id.iv_vip);
                //iv_vip.setAlpha(0.2f);透明度值是0-255
                iv_vip.setImageAlpha(progress * 255 /100);
            }

            //onStartTrackingTouch开始拖动
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            //onStopTrackingTouch停止拖动
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                pb_2.setProgress(seekBar.getProgress());

                if (seekBar.getProgress() == seekBar.getMax())
                {
                    //设置不可见
                    pb_1.setVisibility(View.GONE);
                    /*INVISIBLE不可见（占空间） VISIBLE可见 GONE不可见（不占空间）*/
                }
                else
                {
                    pb_1.setVisibility(View.VISIBLE);
                }


            }
        });

    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        menu.add(0, 1, 0, "添加");
        menu.add(0, 2, 1, "修改");
        menu.add(0, 3, 2, "删除");
        SubMenu m = menu.addSubMenu(0, 4, 3, "子菜单");

        m.add(0,41,0,"子菜单项1");
        m.add(0, 42, 1, "子菜单项2");
        m.add(0,43,2,"子菜单项3");
        m.add(0,44,3,"子菜单项4");
//        MenuInflater mi =getMenuInflater();
//        mi.inflate(R.menu.mymenu,menu);
        super.onCreateContextMenu(menu, v, menuInfo);
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        switch (item.getItemId())
        {
            case R.id.it_2:
                Toast.makeText(UIActivity2.this, "触发了添加1功能", Toast.LENGTH_SHORT).show();
                break;
            case R.id.it_1:
                Toast.makeText(UIActivity2.this, "触发了删除1功能", Toast.LENGTH_SHORT).show();
                break;
        }
        return super.onContextItemSelected(item);
    }

    @Override
    //重写  创建选项菜单的方法
    public boolean onCreateOptionsMenu(Menu menu) {

        //添加菜单项
        //纯编码方式
//        menu.add(0,1,0,"添加");
//        menu.add(0,2,2,"删除");
//        menu.add(0,3,1,"修改");

        //加载菜单文件方式
        //1.获取菜单加载器
        MenuInflater mi =getMenuInflater();
        mi.inflate(R.menu.mymenu, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        //Toast.makeText(UIActivity2.this, "选中的菜单项是" + item.getTitle(), Toast.LENGTH_SHORT).show();
        //根据菜单项的不同响应不同功能
        switch (item.getItemId())
        {
            case 1:
                Toast.makeText(UIActivity2.this, "触发了添加功能", Toast.LENGTH_SHORT).show();
                break;
            case 2:
                Toast.makeText(UIActivity2.this, "触发了删除功能", Toast.LENGTH_SHORT).show();
                break;
            case 3:
                Toast.makeText(UIActivity2.this, "触发了修改功能", Toast.LENGTH_SHORT).show();
                break;
            case R.id.it_2:
                Toast.makeText(UIActivity2.this, "触发了添加1功能", Toast.LENGTH_SHORT).show();
                break;
            case R.id.it_1:
                Toast.makeText(UIActivity2.this, "触发了删除1功能", Toast.LENGTH_SHORT).show();
                break;
        }


        return super.onOptionsItemSelected(item);
    }
    public void pt_OnClick(View v)
    {
        //构建普通对话框
        //对话框的构建器
//        AlertDialog.Builder ab = new AlertDialog.Builder(this);
//        ab.setTitle("数据删除");
//        ab.setMessage("你确定要删除吗?");
//        //负面按钮
//        ab.setNeutralButton("取消", null);
//        //正面按钮
//        ab.setPositiveButton("确定", new DialogInterface.OnClickListener() {
//            @Override
//            public void onClick(DialogInterface dialog, int which) {
//                Toast.makeText(UIActivity2.this, "删除成功", Toast.LENGTH_SHORT).show();
//            }
//        });
        //显示
//        ab.show();
        //方法链调用
        new AlertDialog.Builder(this)
                .setTitle("确认保存")
                .setMessage("你真的要保存吗?")
                .setNeutralButton("取消",null)
                .setPositiveButton("保存",null)
                .show();


    }
    public void dx_OnClick(View v)
    {
        final String[] str_color = {"红","绿","蓝","灰"};
        new AlertDialog.Builder(this)
                .setTitle("请选择颜色")
                .setSingleChoiceItems(str_color, 0, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(UIActivity2.this, "选中了" + str_color[which], Toast.LENGTH_SHORT).show();

                       //移除对话框
                        //dialog.dismiss();
                    }
                })
                .setNeutralButton("确定",null)
                .setPositiveButton("取消",null)
                .show();

    }
    public void duox_OnClick(View v)
    {
        final String[] str_color = {"红","绿","蓝","灰"};
        final boolean[] bl_xz = {true,false,false,true};
        new AlertDialog.Builder(this)
                .setTitle("请选择颜色")
                .setMultiChoiceItems(str_color, bl_xz, new DialogInterface.OnMultiChoiceClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                        if (isChecked) {
                            Toast.makeText(UIActivity2.this, str_color[which] + "被选中", Toast.LENGTH_SHORT).show();

                        } else {
                            Toast.makeText(UIActivity2.this, str_color[which] + "取消选中", Toast.LENGTH_SHORT).show();

                        }
                    }
                })
                .setNeutralButton("确定", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                //遍历数组
                                for (boolean b : bl_xz) {
                                    try {
                                        Thread.sleep(100);
                                    } catch (Exception ex) {

                                    }
                                    Toast.makeText(UIActivity2.this, "值 = " + b, Toast.LENGTH_SHORT).show();
                                }
                            }
                        }

                )
                            .

                    show();

                }

    public void zdy_OnClick(View v)
    {
       //1.获取加载器
        //LayoutInflater lif = getLayoutInflater();
       //2.用加载器加载文件
        //final View v_1 = lif.inflate(R.layout.loginlayout, null);

        new AlertDialog.Builder(this)

               .setView(R.layout.loginlayout)
                //.setView(v_1)
                .setNeutralButton("取消", null)
                .setPositiveButton("登陆", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        AlertDialog al = (AlertDialog) dialog;
                        //找不到时需要指定范围，可以是视图或者对话框（5.0以上支持）
                        //处理数据
                        EditText et_username = (EditText) al.findViewById(R.id.et_username);
                        Toast.makeText(UIActivity2.this, "用户名 = " + et_username.getText(), Toast.LENGTH_SHORT).show();

                    }
                })
                .show();
    }
    public void jdt_OnClick(View v)
    {
        final ProgressDialog pd =new ProgressDialog(this);
        pd.setMessage("正在加载中，请稍候...");
       // pd.setTitle("进度对话框");
        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();
                try
                {
                    Thread.sleep(3000);
                }
                catch (Exception e)
                {

                }
                pd.dismiss(); //关闭

            }//重写run方法，利用start启动多线程
        }.start();

    }
    public void jdt1_OnClick(View v)
    {
        final ProgressDialog pd =new ProgressDialog(this);
        pd.setMessage("请稍候...");
        pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

        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(); //关闭

            }
        }.start();

    }


}

<?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="match_parent"
        android:layout_height="wrap_content"
        android:src="@drawable/title"
        android:scaleType="fitXY"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="用户名"
        android:id="@+id/et_username"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="密码"
        android:inputType="textPassword"
        android:id="@+id/et_pw"/>

</LinearLayout>