目录
1.写在前面
2.代码示例
2.1 普通Dialog(图1与图2)
2.2 列表Dialog(图3)
2.3 单选Dialog(图4)
2.4 多选Dialog(图5)
2.5 等待Dialog(图6)
2.6 进度条Dialog(图7)
2.7 编辑Dialog(图8)
2.8 自定义Dialog(图9)
3.复写回调函数
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1.写在前面
- 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();
}
}
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- 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();
}
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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();
}
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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();
}
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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();
}
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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();
}
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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();
}
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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();
}
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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();
}
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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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