【移动应用开发技术】怎么在Android中实现一个对话框

【移动应用开发技术】怎么在Android中实现一个对话框

怎么在Android中实现一个对话框？针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。2个按钮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/*

@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）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）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）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）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）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）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）<!--

res/layout/dialog_customize.xml-->

<!--

自定义View

-->

<LinearLayout

xmlns:android="/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>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/*

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

S