- Android提供了丰富的
Dialog
函数,本文介绍最常用的8种对话框的使用方法,包括普通(包含提示消息和按钮)、列表、单选、多选、等待、进度条、编辑、自定义等多种形式,将在第2部分介绍。 - 有时,我们希望在对话框创建或关闭时完成一些特定的功能,这需要
复写
Dialog的create()
、show()
、dismiss()
等方法,将在第3部分介绍。
2.代码示例
2.1 普通Dialog(图1与图2)
- 2个按钮
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public class MainActivity
extends Activity
{ @Override protected void onCreate(Bundle
savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button
buttonNormal = (Button) findViewById(R.id.button_normal); buttonNormal.setOnClickListener( new View.OnClickListener()
{ @Override public void onClick(View
v) { showNormalDialog(); } }); } private void showNormalDialog(){ /*
@setIcon 设置对话框图标 *
@setTitle 设置对话框标题 *
@setMessage 设置对话框消息提示 *
setXXX方法返回Dialog对象,因此可以链式设置属性 */ final AlertDialog.Builder
normalDialog = new AlertDialog.Builder(MainActivity. this ); normalDialog.setIcon(R.drawable.icon_dialog); normalDialog.setTitle( "我是一个普通Dialog" ) normalDialog.setMessage( "你要点击哪一个按钮呢?" ); normalDialog.setPositiveButton( "确定" ,
new DialogInterface.OnClickListener()
{ @Override public void onClick(DialogInterface
dialog, int which)
{ //...To-do } }); normalDialog.setNegativeButton( "关闭" ,
new DialogInterface.OnClickListener()
{ @Override public void onClick(DialogInterface
dialog, int which)
{ //...To-do } }); //
显示 normalDialog.show(); } } |
- 3个按钮
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/*
@setNeutralButton 设置中间的按钮 *
若只需一个按钮,仅设置 setPositiveButton 即可 */ private void showMultiBtnDialog(){ AlertDialog.Builder
normalDialog = new AlertDialog.Builder(MainActivity. this ); normalDialog.setIcon(R.drawable.icon_dialog); normalDialog.setTitle( "我是一个普通Dialog" ).setMessage( "你要点击哪一个按钮呢?" ); normalDialog.setPositiveButton( "按钮1" ,
new DialogInterface.OnClickListener()
{ @Override public void onClick(DialogInterface
dialog, int which)
{ //
...To-do } }); normalDialog.setNeutralButton( "按钮2" ,
new DialogInterface.OnClickListener()
{ @Override public void onClick(DialogInterface
dialog, int which)
{ //
...To-do } }); normalDialog.setNegativeButton( "按钮3" ,
new DialogInterface.OnClickListener()
{ @Override public void onClick(DialogInterface
dialog, int which)
{ //
...To-do } }); //
创建实例并显示 normalDialog.show(); } |
2.2 列表Dialog(图3)
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private void showListDialog()
{ final String[]
items = { "我是1" , "我是2" , "我是3" , "我是4" }; AlertDialog.Builder
listDialog = new AlertDialog.Builder(MainActivity. this ); listDialog.setTitle( "我是一个列表Dialog" ); listDialog.setItems(items,
new DialogInterface.OnClickListener()
{ @Override public void onClick(DialogInterface
dialog, int which)
{ //
which 下标从0开始 //
...To-do Toast.makeText(MainActivity. this ,
"你点击了" +
items[which], Toast.LENGTH_SHORT).show(); } }); listDialog.show(); } |
2.3 单选Dialog(图4)
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int yourChoice; private void showSingleChoiceDialog(){ final String[]
items = { "我是1" , "我是2" , "我是3" , "我是4" }; yourChoice
= - 1 ; AlertDialog.Builder
singleChoiceDialog = new AlertDialog.Builder(MainActivity. this ); singleChoiceDialog.setTitle( "我是一个单选Dialog" ); //
第二个参数是默认选项,此处设置为0 singleChoiceDialog.setSingleChoiceItems(items,
0 ,
new DialogInterface.OnClickListener()
{ @Override public void onClick(DialogInterface
dialog, int which)
{ yourChoice
= which; } }); singleChoiceDialog.setPositiveButton( "确定" ,
new DialogInterface.OnClickListener()
{ @Override public void onClick(DialogInterface
dialog, int which)
{ if (yourChoice
!= - 1 )
{ Toast.makeText(MainActivity. this ,
"你选择了" +
items[yourChoice], Toast.LENGTH_SHORT).show(); } } }); singleChoiceDialog.show(); } |
2.4 多选Dialog(图5)
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ArrayList<Integer>
yourChoices = new ArrayList<>(); private void showMultiChoiceDialog()
{ final String[]
items = { "我是1" , "我是2" , "我是3" , "我是4" }; //
设置默认选中的选项,全为false默认均未选中 final boolean initChoiceSets[]={ false , false , false , false }; yourChoices.clear(); AlertDialog.Builder
multiChoiceDialog = new AlertDialog.Builder(MainActivity. this ); multiChoiceDialog.setTitle( "我是一个多选Dialog" ); multiChoiceDialog.setMultiChoiceItems(items,
initChoiceSets, new DialogInterface.OnMultiChoiceClickListener()
{ @Override public void onClick(DialogInterface
dialog, int which, boolean isChecked)
{ if (isChecked)
{ yourChoices.add(which); }
else { yourChoices.remove(which); } } }); multiChoiceDialog.setPositiveButton( "确定" ,
new DialogInterface.OnClickListener()
{ @Override public void onClick(DialogInterface
dialog, int which)
{ int size
= yourChoices.size(); String
str = "" ; for ( int i
= 0 ;
i < size; i++) { str
+= items[yourChoices.get(i)] + "
" ; } Toast.makeText(MainActivity. this ,
"你选中了" +
str, Toast.LENGTH_SHORT).show(); } }); multiChoiceDialog.show(); } |
2.5 等待Dialog(图6)
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private void showWaitingDialog()
{ /*
等待Dialog具有屏蔽其他控件的交互能力 *
@setCancelable 为使屏幕不可点击,设置为不可取消(false) *
下载等事件完成后,主动调用函数关闭该Dialog */ ProgressDialog
waitingDialog= new ProgressDialog(MainActivity. this ); waitingDialog.setTitle( "我是一个等待Dialog" ); waitingDialog.setMessage( "等待中..." ); waitingDialog.setIndeterminate( true ); waitingDialog.setCancelable( false ); waitingDialog.show(); } |
2.6 进度条Dialog(图7)
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private void showProgressDialog()
{ /*
@setProgress 设置初始进度 *
@setProgressStyle 设置样式(水平进度条) *
@setMax 设置进度最大值 */ final int MAX_PROGRESS
= 100 ; final ProgressDialog
progressDialog = new ProgressDialog(MainActivity. this ); progressDialog.setProgress( 0 ); progressDialog.setTitle( "我是一个进度条Dialog" ); progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); progressDialog.setMax(MAX_PROGRESS); progressDialog.show(); /*
模拟进度增加的过程 *
新开一个线程,每个100ms,进度增加1 */ new Thread( new Runnable()
{ @Override public void run()
{ int progress=
0 ; while (progress
< MAX_PROGRESS){ try { Thread.sleep( 100 ); progress++; progressDialog.setProgress(progress); }
catch (InterruptedException
e){ e.printStackTrace(); } } //
进度达到最大值后,窗口消失 progressDialog.cancel(); } }).start(); } |
2.7 编辑Dialog(图8)
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private void showInputDialog()
{ /*@setView
装入一个EditView */ final EditText
editText = new EditText(MainActivity. this ); AlertDialog.Builder
inputDialog = new AlertDialog.Builder(MainActivity. this ); inputDialog.setTitle( "我是一个输入Dialog" ).setView(editText); inputDialog.setPositiveButton( "确定" ,
new DialogInterface.OnClickListener()
{ @Override public void onClick(DialogInterface
dialog, int which)
{ Toast.makeText(MainActivity. this , editText.getText().toString(),
Toast.LENGTH_SHORT).show(); } }).show(); } |
2.8 自定义Dialog(图9)
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<!--
res/layout/dialog_customize.xml--> <!--
自定义View --> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> < EditText android:id="@+id/edit_text" android:layout_width="match_parent" android:layout_height="wrap_content"
/> </ LinearLayout > |
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private void showCustomizeDialog()
{ /*
@setView 装入自定义View ==> R.layout.dialog_customize *
由于dialog_customize.xml只放置了一个EditView,因此和图8一样 *
dialog_customize.xml可自定义更复杂的View */ AlertDialog.Builder
customizeDialog = new AlertDialog.Builder(MainActivity. this ); final View
dialogView = LayoutInflater.from(MainActivity. this ) .inflate(R.layout.dialog_customize, null ); customizeDialog.setTitle( "我是一个自定义Dialog" ); customizeDialog.setView(dialogView); customizeDialog.setPositiveButton( "确定" , new DialogInterface.OnClickListener()
{ @Override public void onClick(DialogInterface
dialog, int which)
{ //
获取EditView中的输入内容 EditText
edit_text = (EditText)
dialogView.findViewById(R.id.edit_text); Toast.makeText(MainActivity. this , edit_text.getText().toString(), Toast.LENGTH_SHORT).show(); } }); customizeDialog.show(); } |
3.复写回调函数
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/*
复写Builder的create和show函数,可以在Dialog显示前实现必要设置 *
例如初始化列表、默认选项等 *
@create 第一次创建时调用 *
@show 每次显示时调用 */ private void showListDialog()
{ final String[]
items = { "我是1" , "我是2" , "我是3" , "我是4" }; AlertDialog.Builder
listDialog = new AlertDialog.Builder(MainActivity. this ){ @Override public AlertDialog
create() { items[ 0 ]
= "我是No.1" ; return super .create(); } @Override public AlertDialog
show() { items[ 1 ]
= "我是No.2" ; return super .show(); } }; listDialog.setTitle( "我是一个列表Dialog" ); listDialog.setItems(items,
new DialogInterface.OnClickListener()
{ @Override public void onClick(DialogInterface
dialog, int which)
{ //
...To-do } }); /*
@setOnDismissListener Dialog销毁时调用 *
@setOnCancelListener Dialog关闭时调用 */ listDialog.setOnDismissListener( new DialogInterface.OnDismissListener()
{ public void onDismiss(DialogInterface
dialog) { Toast.makeText(getApplicationContext(), "Dialog被销毁了" ,
Toast.LENGTH_SHORT).show(); } }); listDialog.show(); }
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