Andriod课程设计(3)

mPath.moveTo(x, y); this.mX = x; this.mY = y; } @Override public void fingerMove(float x, float y, Canvas canvas) { float dx = Math.abs(x - mX); float dy = Math.abs(y - mY); if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) { mPath.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2); mX = x; mY = y; } this.draw(canvas); } @Override public void fingerUp(float x, float y, Canvas canvas) { mPath.lineTo(mX, mY); this.draw(canvas); mPath.reset(); } }

6. package org.vhow.paintpad.drawings;

import org.vhow.paintpad.tools.Brush;

import android.graphics.Canvas; import android.graphics.RectF;

public class Oval extends Drawing { RectF rectF = null; public Oval() { rectF = new RectF(); } @Override

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public void draw(Canvas canvas) { rectF.left = this.startX; rectF.right = this.stopX; rectF.top = this.startY; rectF.bottom = this.stopY; canvas.drawOval(rectF, Brush.getPen()); } }

7. package org.vhow.paintpad.drawings;

import org.vhow.paintpad.tools.Brush;

import android.graphics.Canvas; import android.graphics.Path; /**

* Track the finger's movement on the screen. */

public class PathLine extends Drawing { Path mPath = null; private float mX, mY; private static final float TOUCH_TOLERANCE = 4; public PathLine() { mPath = new Path(); } @Override public void draw(Canvas canvas) { canvas.drawPath(this.mPath, Brush.getPen()); } @Override public void fingerDown(float x, float y, Canvas canvas) { mPath.reset(); mPath.moveTo(x, y); this.mX = x; this.mY = y;

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} @Override public void fingerMove(float x, float y, Canvas canvas) { float dx = Math.abs(x - mX); float dy = Math.abs(y - mY); if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) { mPath.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2); mX = x; mY = y; } this.draw(canvas); } @Override public void fingerUp(float x, float y, Canvas canvas) { mPath.lineTo(mX, mY); this.draw(canvas); mPath.reset(); } }

8. package org.vhow.paintpad.drawings;

import org.vhow.paintpad.tools.Brush;

import android.graphics.Canvas; import android.graphics.Paint; /**

* Some points. */

public class Points extends Drawing { Paint pen; public Points() { pen = new Paint(Brush.getPen()); pen.setStyle(Paint.Style.FILL); }

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@Override public void draw(Canvas canvas) { canvas.drawCircle(stopX, stopY, Brush.getPen().getStrokeWidth() + 1, pen); } @Override public void fingerDown(float x, float y, Canvas canvas) { canvas.drawCircle(x, y, Brush.getPen().getStrokeWidth() + 1, pen); } @Override public void fingerMove(float x, float y, Canvas canvas) { canvas.drawCircle(x, y, Brush.getPen().getStrokeWidth() + 1, pen); } }

9. package org.vhow.paintpad.drawings;

import org.vhow.paintpad.tools.Brush;

import android.graphics.Canvas; /**

* A rectangle. */

public class Rect extends Drawing { @Override public void draw(Canvas canvas) { canvas.drawRect(this.startX, this.startY, this.stopX, this.stopY, Brush.getPen()); } }

10. package org.vhow.paintpad.drawings;

import org.vhow.paintpad.tools.Brush;

import android.graphics.Canvas;

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/**

* A straight line. */

public class StraightLine extends Drawing { @Override public void draw(Canvas canvas) { canvas.drawLine(this.startX, this.startY, this.stopX, this.stopY, Brush.getPen()); } }

4.2主要代码：

1. package org.vhow.paintpad.setting;

import java.text.SimpleDateFormat; import java.util.zip.ZipEntry; import java.util.zip.ZipFile;

import org.vhow.paintpad.R;

import org.vhow.paintpad.helper.ColorPickerDialog; import org.vhow.paintpad.tools.Brush;

import android.content.DialogInterface; import android.content.SharedPreferences; import android.content.pm.ApplicationInfo;

import android.content.pm.PackageManager.NameNotFoundException; import android.os.Bundle;

import android.preference.CheckBoxPreference; import android.preference.Preference;

import android.preference.Preference.OnPreferenceClickListener; import android.preference.PreferenceActivity; /**

* When the user select \ * implements OnPreferenceClickListener interface, when the user click * Preference the onPreferenceClick() will be called. */

public class SettingsActivity extends PreferenceActivity implements OnPreferenceClickListener, ColorPickerDialog.OnColorChangedListener { SharedPreferences prefs = null; Preference pen_width = null;

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