概述
Android自带的AlertDialog,ProgressDialog,DatePickerDialog,TimePickerDialog 可以用于简单的对话框显示。当还是有这些对话框不能满足应用需要的时候，这时就可以使用一些自定义的对话框。有多种方法可以实现自定义对话框。一是使用Activity作为Dialog，可以通过设置Activity显示Dialog风格，使得该Activity在外观上和Dialog一致：显示在其它Activity前面且半透明。
<Activity android:name=”MyDialogActivity” Android:theme=”@android:style/Theme.Dialog“></Activity>
本例采用另外两种方法来使用自定义对话框,将用这个对话框来最为图形变换(Transform)的选项：
Primitive: Rectange, Ellipse,Text
Pen: Thin,Thick,Dashed
Brush: Solid, Gradient,Texture
Transform: Identity, Rotate, Scale, Shear
Rendering: Stroke, Fill, Stoke and Fill
首先在res/layout 下新建transformoption.xml 作为自定义对话框布局：
<?xml version=”1.0″ encoding=”utf-8″?>
<LinearLayout
xmlns:android=”http://schemas.android.com/apk/res/android”
android:layout_width=”fill_parent”
android:layout_height=”fill_parent”
>
<ScrollView
android:layout_width=”fill_parent”
android:layout_height=”fill_parent”>
<LinearLayout
android:layout_width=”fill_parent”
android:layout_height=”fill_parent”
android:orientation=”vertical”
>
<TextView
android:text=”Primitive”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</TextView>
<RadioGroup
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
<RadioButton
android:text=”Rectangle”
android:id=”@+id/radioRectangle”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Ellipse”
android:id=”@+id/radioEllipse”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Text”
android:id=”@+id/radioText”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
</RadioGroup>
<TextView
android:text=”Pen”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</TextView>
<RadioGroup
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
<RadioButton
android:text=”Thin”
android:id=”@+id/radioThin”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Thick”
android:id=”@+id/radioThick”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Dashed”
android:id=”@+id/radioDashed”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
</RadioGroup>
<TextView
android:text=”Brush”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</TextView>
<RadioGroup
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
<RadioButton
android:text=”Solid”
android:id=”@+id/radioSolid”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Gradient”
android:id=”@+id/radioGradient”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Texture”
android:id=”@+id/radioTexture”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
</RadioGroup>
<TextView
android:text=”Transform”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</TextView>
<RadioGroup
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
<RadioButton
android:text=”Identity”
android:id=”@+id/radioIdentity”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Rotate”
android:id=”@+id/radioRotate”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Scale”
android:id=”@+id/radioScale”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Shear”
android:id=”@+id/radioShear”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
</RadioGroup>
<TextView
android:text=”Rendering”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</TextView>
<RadioGroup
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
<RadioButton
android:text=”Stroke”
android:id=”@+id/radioStroke”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Fill”
android:id=”@+id/radioFill”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Stroke and Fill”
android:id=”@+id/radioStrokeFill”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
</RadioGroup>
</LinearLayout>
</ScrollView>
</LinearLayout>
一种方法是重新定制AlertDialog ，基本步骤和Android简明开发教程十七：Dialog 显示图像类似，但是在protected Dialog onCreateDialog(int id) ，需要重新设定Dialog的Content View并给RadioButton添加事件处理：
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protected
Dialog onCreateDialog(
int
id) {
final
Dialog dialog;
switch
(id) {
case
OPTION_DIALOG:
LayoutInflater li
= LayoutInflater.from(
this
);
View optionView
= li.inflate(R.layout.transformoption,
null
);
AlertDialog.Builder optionDialog
=
new
AlertDialog.Builder(
this
);
optionDialog.setTitle(
"Options"
);
optionDialog.setView(optionView);
dialog = optionDialog.create();
RadioButton button = (RadioButton) optionView
.findViewById(R.id.radioRectangle);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
primitiveIndex = PRIMITIVE_RECTANGLE;
drawImage();
dialog.dismiss();
}
});
...
button = (RadioButton) optionView
.findViewById(R.id.radioStrokeFill);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
renderingIndex = RENDERING_STROKE_AND_FILL;
drawImage();
dialog.dismiss();
}
});
return
dialog;
}
return
null
;
}
|
第二种是通过派生Dialog ，定义了一个OptionDialog类作为Dialog子类。
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class
OptionDialog
extends
Dialog {
public
OptionDialog(Context context) {
super
(context);
// TODO Auto-generated constructor stub
}
protected
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.transformoption);
setTitle(
"Options"
);
RadioButton button
= (RadioButton) findViewById(R.id.radioRectangle);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
primitiveIndex = PRIMITIVE_RECTANGLE;
drawImage();
dismiss();
}
});
...
button = (RadioButton) findViewById(R.id.radioStrokeFill);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
renderingIndex = RENDERING_STROKE_AND_FILL;
drawImage();
dismiss();
}
});
}
}
|
这两种方法在显示Dialog时有所不同：
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private
OptionDialog optionDialog;
static
final
private
int
OPTION_DIALOG =
1
;
...
optionDialog =
new
OptionDialog(
this
);
...
@Override
public
void
onClick(View view) {
// optionDialog.show();
showDialog(OPTION_DIALOG);
}
|
下面是完整代码：
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public
class
Transform
extends
Graphics2DActivity
implements
OnClickListener {
static
int
PRIMITIVE_RECTANGLE =
0
;
static
int
PRIMITIVE_ELLIPSE =
1
;
static
int
PRIMITIVE_TEXT =
2
;
static
int
PEN_THIN =
0
;
static
int
PEN_THICK =
1
;
static
int
PEN_DASHED =
2
;
static
int
BRUSH_SOLID =
0
;
static
int
BRUSH_GRADIENT =
1
;
static
int
BRUSH_TEXTURE =
2
;
static
int
TRANSFORM_IDENTITY =
0
;
static
int
TRANSFORM_ROTATE =
1
;
static
int
TRANSFORM_SCALE =
2
;
static
int
TRANSFORM_SHEAR =
3
;
static
int
RENDERING_STROKE =
0
;
static
int
RENDERING_FILL =
1
;
static
int
RENDERING_STROKE_AND_FILL =
2
;
int
primitiveIndex;
int
penIndex;
int
brushIndex;
int
transformIndex;
int
renderingIndex;
int
[] rgbData;
int
bitmapWidth;
int
bitmapHeight;
class
OptionDialog
extends
Dialog {
public
OptionDialog(Context context) {
super
(context);
// TODO Auto-generated constructor stub
}
protected
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.transformoption);
setTitle(
"Options"
);
RadioButton button
= (RadioButton) findViewById(R.id.radioRectangle);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
primitiveIndex = PRIMITIVE_RECTANGLE;
drawImage();
dismiss();
}
});
button = (RadioButton) findViewById(R.id.radioEllipse);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
primitiveIndex = PRIMITIVE_ELLIPSE;
drawImage();
dismiss();
}
});
button = (RadioButton) findViewById(R.id.radioText);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
primitiveIndex = PRIMITIVE_TEXT;
drawImage();
dismiss();
}
});
button = (RadioButton) findViewById(R.id.radioThin);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
penIndex = PEN_THIN;
drawImage();
dismiss();
}
});
button = (RadioButton) findViewById(R.id.radioThick);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
penIndex = PEN_THICK;
drawImage();
dismiss();
}
});
button = (RadioButton) findViewById(R.id.radioDashed);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
penIndex = PEN_DASHED;
drawImage();
dismiss();
}
});
button = (RadioButton) findViewById(R.id.radioSolid);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
brushIndex = BRUSH_SOLID;
drawImage();
dismiss();
}
});
button = (RadioButton) findViewById(R.id.radioGradient);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
brushIndex = BRUSH_GRADIENT;
drawImage();
dismiss();
}
});
button = (RadioButton) findViewById(R.id.radioTexture);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
brushIndex = BRUSH_TEXTURE;
drawImage();
dismiss();
}
});
button = (RadioButton) findViewById(R.id.radioIdentity);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
transformIndex = TRANSFORM_IDENTITY;
drawImage();
dismiss();
}
});
button = (RadioButton) findViewById(R.id.radioRotate);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
transformIndex = TRANSFORM_ROTATE;
drawImage();
dismiss();
}
});
button = (RadioButton) findViewById(R.id.radioScale);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
transformIndex = TRANSFORM_SCALE;
drawImage();
dismiss();
}
});
button = (RadioButton) findViewById(R.id.radioShear);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
transformIndex = TRANSFORM_SHEAR;
drawImage();
dismiss();
}
});
button = (RadioButton) findViewById(R.id.radioStroke);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
renderingIndex = RENDERING_STROKE;
drawImage();
dismiss();
}
});
button = (RadioButton) findViewById(R.id.radioFill);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
renderingIndex = RENDERING_FILL;
drawImage();
dismiss();
}
});
button = (RadioButton) findViewById(R.id.radioStrokeFill);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
renderingIndex = RENDERING_STROKE_AND_FILL;
drawImage();
dismiss();
}
});
}
}
private
OptionDialog optionDialog;
private
Button btnOptions;
static
final
private
int
OPTION_DIALOG =
1
;
private
AffineTransform at =
new
AffineTransform();
private
int
w, h;
private
IShape shapes[] =
new
IShape[
3
];
private
boolean
firstTime =
true
;
private
FontEx font = FontEx.getSystemFont();
@Override
protected
void
drawImage() {
drawTransform();
}
protected
Dialog onCreateDialog(
int
id) {
final
Dialog dialog;
switch
(id) {
case
OPTION_DIALOG:
LayoutInflater li
= LayoutInflater.from(
this
);
View optionView
= li.inflate(R.layout.transformoption,
null
);
AlertDialog.Builder optionDialog
=
new
AlertDialog.Builder(
this
);
optionDialog.setTitle(
"Options"
);
optionDialog.setView(optionView);
dialog = optionDialog.create();
RadioButton button = (RadioButton) optionView
.findViewById(R.id.radioRectangle);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
primitiveIndex = PRIMITIVE_RECTANGLE;
drawImage();
dialog.dismiss();
}
});
button = (RadioButton)
optionView.findViewById(R.id.radioEllipse);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
primitiveIndex = PRIMITIVE_ELLIPSE;
drawImage();
dialog.dismiss();
}
});
button = (RadioButton)
optionView.findViewById(R.id.radioText);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
primitiveIndex = PRIMITIVE_TEXT;
drawImage();
dialog.dismiss();
}
});
button = (RadioButton)
optionView.findViewById(R.id.radioThin);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
penIndex = PEN_THIN;
drawImage();
dialog.dismiss();
}
});
button = (RadioButton)
optionView.findViewById(R.id.radioThick);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
penIndex = PEN_THICK;
drawImage();
dialog.dismiss();
}
});
button = (RadioButton)
optionView.findViewById(R.id.radioDashed);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
penIndex = PEN_DASHED;
drawImage();
dialog.dismiss();
}
});
button = (RadioButton)
optionView.findViewById(R.id.radioSolid);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
brushIndex = BRUSH_SOLID;
drawImage();
dialog.dismiss();
}
});
button = (RadioButton)
optionView.findViewById(R.id.radioGradient);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
brushIndex = BRUSH_GRADIENT;
drawImage();
dialog.dismiss();
}
});
button = (RadioButton)
optionView.findViewById(R.id.radioTexture);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
brushIndex = BRUSH_TEXTURE;
drawImage();
dialog.dismiss();
}
});
button = (RadioButton)
optionView.findViewById(R.id.radioIdentity);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
transformIndex = TRANSFORM_IDENTITY;
drawImage();
dialog.dismiss();
}
});
button = (RadioButton)
optionView.findViewById(R.id.radioRotate);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
transformIndex = TRANSFORM_ROTATE;
drawImage();
dialog.dismiss();
}
});
button = (RadioButton)
optionView.findViewById(R.id.radioScale);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
transformIndex = TRANSFORM_SCALE;
drawImage();
dialog.dismiss();
}
});
button = (RadioButton)
optionView.findViewById(R.id.radioShear);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
transformIndex = TRANSFORM_SHEAR;
drawImage();
dialog.dismiss();
}
});
button = (RadioButton)
optionView.findViewById(R.id.radioStroke);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
renderingIndex = RENDERING_STROKE;
drawImage();
dialog.dismiss();
}
});
button = (RadioButton)
optionView.findViewById(R.id.radioFill);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
renderingIndex = RENDERING_FILL;
drawImage();
dialog.dismiss();
}
});
button = (RadioButton) optionView
.findViewById(R.id.radioStrokeFill);
button.setOnClickListener(
new
Button.OnClickListener() {
public
void
onClick(View v) {
renderingIndex = RENDERING_STROKE_AND_FILL;
drawImage();
dialog.dismiss();
}
});
return
dialog;
}
return
null
;
}
public
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.transform);
graphic2dView = (GuidebeeGraphics2DView)
findViewById(R.id.graphics2dview);
btnOptions = (Button) findViewById(R.id.btnOption);
btnOptions.setOnClickListener(
this
);
shapes[
0
] =
new
Rectangle(
0
,
0
,
100
,
100
);
shapes[
1
] =
new
Ellipse(
0
,
0
,
100
,
100
);
IShape[] fontShapes = font.getGlyphArray(
96
,
"TEXT"
.toCharArray(),
0
,
4
, FontEx.TEXT_DIR_LR);
shapes[
2
] =
new
Area(fontShapes[
0
]);
for
(
int
i =
1
; i < fontShapes.length; i++) {
((Area) shapes[
2
]).add(
new
Area(fontShapes[i]));
}
Bitmap bitmap = BitmapFactory.decodeResource(
getResources(),
R.drawable.brick);
bitmapWidth = bitmap.getWidth();
bitmapHeight = bitmap.getHeight();
rgbData =
new
int
[bitmapWidth * bitmapHeight];
bitmap.getPixels(rgbData,
0
, bitmapWidth,
0
,
0
,
bitmapWidth,
bitmapHeight);
w = SharedGraphics2DInstance.CANVAS_WIDTH;
h = SharedGraphics2DInstance.CANVAS_HEIGHT;
optionDialog =
new
OptionDialog(
this
);
}
private
void
setTrans(
int
transIndex) {
// Sets the AffineTransform.
switch
(transIndex) {
case
0
:
at.setToIdentity();
at.translate(w /
2
, h /
2
);
break
;
case
1
:
at.rotate(Math.toRadians(
45
));
break
;
case
2
:
at.scale(
0.5
,
0.5
);
break
;
case
3
:
at.shear(
0.5
,
0.0
);
break
;
}
}
private
void
drawTransform() {
graphics2D.clear(Color.WHITE);
graphics2D.Reset();
setTrans(transformIndex);
graphics2D.setAffineTransform(at);
// Initialize the transform.
if
(firstTime) {
at.setToIdentity();
at.translate(w /
2
, h /
2
);
firstTime =
false
;
}
// Sets the Stroke.
Pen pen =
null
;
switch
(penIndex) {
case
0
:
pen =
new
Pen(Color.BLACK,
1
);
break
;
case
1
:
pen =
new
Pen(Color.BLACK,
8
);
break
;
case
2
: {
int
dash[] = {
10
,
10
};
pen =
new
Pen(Color.BLACK,
1
, Pen.CAP_BUTT,
Pen.JOIN_MITER, dash,
0
);
}
break
;
}
// Sets the Paint.
Brush brush =
null
;
switch
(brushIndex) {
case
0
:
brush =
new
SolidBrush(Color.BLUE);
break
;
case
1
: {
int
[] fractions =
new
int
[] {
13
,
242
};
Color[] colors =
new
Color[] {
new
Color(
0xffff6600
),
new
Color(
0xffffff66
) };
brush =
new
LinearGradientBrush(
50
,
50
,
150
,
125
, fractions,
colors, Brush.REPEAT);
}
break
;
case
2
:
try
{
brush =
new
TextureBrush(rgbData,
bitmapWidth, bitmapHeight);
}
catch
(Exception e) {
}
break
;
}
// Sets the Shape.
IShape shape = shapes[primitiveIndex];
Rectangle r = shape.getBounds();
AffineTransform toCenterAt =
new
AffineTransform();
toCenterAt.concatenate(at);
toCenterAt.translate(-(r.width /
2
), -(r.height /
2
));
graphics2D.setAffineTransform(toCenterAt);
// Sets the rendering method.
switch
(renderingIndex) {
case
0
:
graphics2D.setDefaultPen(pen);
graphics2D.draw(
null
, shape);
break
;
case
1
:
graphics2D.setDefaultBrush(brush);
graphics2D.fill(
null
, shape);
break
;
case
2
:
graphics2D.setPenAndBrush(pen, brush);
graphics2D.fill(
null
, shape);
graphics2D.draw(
null
, shape);
break
;
}
graphic2dView.refreshCanvas();
}
@Override
public
void
onClick(View view) {
// optionDialog.show();
showDialog(OPTION_DIALOG);
}
}
|
上面代码中包含了两种方法的代码，实际应用中可以任选其一。
最后
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