Android简明开发教程十八：自定义对话框 Transform

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。