Android簡明開發教程十八：自定義對話框 Transform
Android自帶的AlertDialog,ProgressDialog,DatePickerDialog,TimePickerDialog 可以用於簡單的對話框顯示。當還是有這些對話框不能滿足應用需要的時候，這時就可以使用一些自定義的對話框。有多種方法可以實現自定義對話框。一是使用Activity作爲Dialog，可以通過設置Activity顯示Dialog風格，使得該Activity在外觀上和Dialog一致：顯示在其它Activity前面且半透明。
<Activity android:name=”MyDialogActivity” Android:theme=”@android:style/Theme.Dialog“></Activity>
本例採用另外兩種方法來使用自定義對話框,將用這個對話框來最爲圖形變換(Transform)的選項：
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 作爲自定義對話框佈局：
<?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>
一種方法是重新定製AlertDialog ，基本步驟和Android簡明開發教程十七：Dialog 顯示圖像類似，但是在protected Dialog onCreateDialog(int id) ，需要重新設定Dialog的Content View並給RadioButton添加事件處理：
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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; } |
第二種是通過派生Dialog ，定義了一個OptionDialog類作爲Dialog子類。
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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(); } }); } } |
這兩種方法在顯示Dialog時有所不同：
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private
OptionDialog optionDialog;static
final private
int OPTION_DIALOG = 1;...optionDialog =
new OptionDialog(this);...@Overridepublic
void onClick(View view) { // optionDialog.show(); showDialog(OPTION_DIALOG);} |
下面是完整代碼：
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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); }} |
上面代碼中包含了兩種方法的代碼，實際應用中可以任選其一。