AlertDialog使用

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可以将对话框主要分为三个部分：
上面区域是标题栏和图标
中间区域是内容区
下方是button区

其他形式各异的对话框也都是基于此的变体而已

要创建一个对话框，我们需要做些什么

1、首先需要创建一个AlertDialog.Builder对象，基本语法：

AlertDialog.Builder alertDialogBuilder=new AlertDialog.Builder(this);

2、通过调用它的create()方法就可以构造出一个对话框

AlertDialog alertDialog = alertDialogBuilder.create();alertDialog.show();//将dialog显示出来

3、通过调用alertDialogBuilder对象的setXX方法来实现

    alertDialogBuilder.setTitle();//设置标题    alertDialogBuilder.setIcon();//设置图表    /*设置下方按钮*/    alertDialogBuilder.setPositiveButton();    alertDialogBuilder.setNegativeButton();    alertDialogBuilder.setNeutralButton();    /*对话框内容区域的设置提供了多种方法*/    setMessage();//设置显示文本    setItems();//设置对话框内容为简单列表项    setSingleChoiceItems();//设置对话框内容为单选列表项    setMultiChoiceItems();//设置对话框内容为多选列表项    setAdapter();//设置对话框内容为自定义列表项    setView();//设置对话框内容为自定义View    //设置对话框是否可取消    setCancelable(booleab cancelable);    setCancelListener(onCancelListener);

简单的AlertDialog

这里写图片描述

关键代码

private void showNormalDialog() {        AlertDialog.Builder builder = new AlertDialog.Builder(this);        builder.setIcon(R.mipmap.ic_launcher);        builder.setTitle(R.string.simpleDialogTitle);        builder.setMessage(R.string.simpleDialogMessage);        //button监听        builder.setPositiveButton(R.string.confirmButton, new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialogInterface, int i) {                Toast.makeText(getApplicationContext(),"您点击了确定按钮",Toast.LENGTH_SHORT).show();            }        });        builder.setNegativeButton(R.string.cancelButton, new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialogInterface, int i) {                Toast.makeText(getApplicationContext(),"您点击了取消按钮",Toast.LENGTH_SHORT).show();            }        });        //设置对话框是可取消的        builder.setCancelable(true);        AlertDialog alertDialog = builder.create();        alertDialog.show();    }

简单列表Dialog

这里写图片描述

关键代码

 private void showNormalItemDialog() {        AlertDialog.Builder builder = new AlertDialog.Builder(this);        builder.setIcon(R.mipmap.ic_launcher);        builder.setTitle(R.string.simpleDialogTitle);        final String[] items = {"Item one","Item two","Item three"};        builder.setItems(items, new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialogInterface, int i) {                Toast.makeText(getApplicationContext(),"You clicked "+items[i],Toast.LENGTH_SHORT).show();            }        });        //设置对话框是可取消的        builder.setCancelable(true);        AlertDialog alertDialog = builder.create();        alertDialog.show();    }

单选列表Dialog

这里写图片描述

关键代码

    private void showSingleChoiceItemDialog() {        AlertDialog.Builder builder = new AlertDialog.Builder(this);        builder.setIcon(R.mipmap.ic_launcher);        builder.setTitle(R.string.singleChoiceItemTitle);        final String[] items = {"Item one","Item two","Item three"};        builder.setSingleChoiceItems(items, 1, new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialogInterface, int i) {                Toast.makeText(getApplicationContext(), "You clicked "+items[i], Toast.LENGTH_SHORT).show();            }        });        builder.setCancelable(true);        AlertDialog alertDialog = builder.create();        alertDialog.show();    }

多选列表Dialog

这里写图片描述

关键代码

private void showMultiChoiceItemDialog() {        AlertDialog.Builder builder = new AlertDialog.Builder(this);        builder.setIcon(R.mipmap.ic_launcher);        builder.setTitle(R.string.multiChoiceItemTitle);        final String[] items = {"Item one","Item two","Item three"};        builder.setMultiChoiceItems(items, new boolean[]{true, true, false}, new DialogInterface.OnMultiChoiceClickListener() {            @Override            public void onClick(DialogInterface dialogInterface, int i, boolean b) {                Toast.makeText(getApplicationContext(),"You clicked "+items[i]+" "+b,Toast.LENGTH_SHORT).show();            }        });        builder.setCancelable(true);        AlertDialog alertDialog = builder.create();        alertDialog.show();    }

自定义布局Dialog

这里写图片描述

先自定义一个布局

dialog_forward_type.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="wrap_content"              android:orientation="vertical"              android:gravity="center">    <TextView        android:id="@+id/dialog_forward_type_title"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_margin="10dp"        android:text="请选择转发类型"/>    <View        android:layout_width="match_parent"        android:layout_height="1dp"        android:background="#dddddd"/>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:padding="20dp">        <LinearLayout            android:id="@+id/dialog_forward_video_layout"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:orientation="vertical"            android:gravity="center"            android:layout_weight="1">            <ImageView                android:layout_width="50dp"                android:layout_height="50dp"                android:src="@mipmap/btn_forward_video"                />            <TextView                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="视频"                android:layout_marginTop="10dp"/>        </LinearLayout>        <LinearLayout            android:id="@+id/dialog_forward_image_layout"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:orientation="vertical"            android:gravity="center"            android:layout_weight="1">            <ImageView                android:layout_width="50dp"                android:layout_height="50dp"                android:src="@mipmap/btn_forward_images"                />            <TextView                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="图片"                android:layout_marginTop="10dp"/>        </LinearLayout>    </LinearLayout></LinearLayout>

关键代码

    private void showCustomDialog() {        AlertDialog.Builder builder = new AlertDialog.Builder(this);        LinearLayout layout = (LinearLayout)getLayoutInflater().inflate(R.layout.dialog_forward_type,null);        builder.setView(layout);        LinearLayout videoLayout = (LinearLayout)layout.findViewById(R.id.dialog_forward_video_layout);        LinearLayout imageLayout = (LinearLayout)layout.findViewById(R.id.dialog_forward_image_layout);        videoLayout.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Toast.makeText(getApplicationContext(),"U clicked Video type",Toast.LENGTH_SHORT).show();            }        });        imageLayout.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Toast.makeText(getApplicationContext(),"U clicked Image type",Toast.LENGTH_SHORT).show();            }        });        builder.setCancelable(true);        AlertDialog alertDialog = builder.create();        alertDialog.show();    }

Demo源码下载

戳这里下载源码

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