相信大家都有使用九宫格解锁，比如在设置手机安全项目中，可以使用九宫格解锁，提高安全性，以及在使用支付功能的时候，为了提高安全使用九宫锁，今天就为大家介绍android实现九宫格的方法，分享给大家供大家参考。具体如下：
运行效果截图如下：
具体代码如下：
布局文件如下：
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<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingbottom="@dimen/activity_vertical_margin" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin" tools:context=".mainactivity" > <com.xuliugen.jiugongge.sudokuview android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /></relativelayout> |
从布局文件中可以看出需要自定义一个view用于绘制九宫格图案：
sudokuview.java
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package com.xuliugen.jiugongge;import android.content.context;import android.graphics.canvas;import android.graphics.color;import android.graphics.paint;import android.util.attributeset;import android.view.motionevent;import android.view.view;import android.widget.toast;public class sudokuview extends view { private static final int defalut_cell_width = 60; //默认的cell宽度 private static final int defalut_cell_stroke_width = 2; private static final int defalut_space = defalut_cell_width >> 1; private cell mcells[] = new cell[9]; // 九宫格：定义用于存放九个数组 private int mcellwidth; private int mcellradius; private int mcellstrokewidth; private int mspace; private paint mpaintnormal; private paint mpaintselected; private int mwidth; private int mheight; private float mcurrentx; private float mcurrenty; private boolean mfinish = false; private stringbuffer msbselected = new stringbuffer(20); /** * 下边是三个构造方法：每一个构造方法中有一个初始化操作 */ public sudokuview(context context) { super(context); init(); } public sudokuview(context context, attributeset attrs) { super(context, attrs); init(); } public sudokuview(context context, attributeset attrs, int defstyleattr) { super(context, attrs, defstyleattr); init(); } /** * 初始化操作 */ private void init() { mcellwidth = densityutil.dip2px(getcontext(), defalut_cell_width); mcellradius = densityutil.dip2px(getcontext(), defalut_cell_width >> 1); mcellstrokewidth = densityutil.dip2px(getcontext(), defalut_cell_stroke_width); mspace = densityutil.dip2px(getcontext(), defalut_space); mpaintnormal = new paint(); mpaintnormal.setcolor(color.white); mpaintnormal.setstrokewidth(mcellstrokewidth); mpaintnormal.setstyle(paint.style.stroke); mpaintnormal.setantialias(true); mpaintselected = new paint(); mpaintselected.setcolor(color.cyan); mpaintselected.setstrokewidth(mcellstrokewidth); mpaintselected.setstyle(paint.style.stroke); mpaintselected.setantialias(true); cell cell; float x; float y; for (int i = 0; i < 9; i++) { x = mspace * (i % 3 + 1) + mcellradius + mcellwidth * (i % 3); y = mspace * (i / 3 + 1) + mcellradius + mcellwidth * (i / 3); cell = new cell(x, y); mcells[i] = cell; } } @override protected void ondraw(canvas canvas) { super.ondraw(canvas); drawcell(canvas); drawline(canvas); } private void drawcell(canvas canvas) { for (int i = 0; i < 9; i++) { canvas.drawcircle(mcells[i].getcenterx(), mcells[i].getcentery(), mcellradius, mcells[i].isselected() ? mpaintselected : mpaintnormal); } } private void drawline(canvas canvas) { if ("".equals(msbselected.tostring())) { return; } string[] selectedindexs = msbselected.tostring().split(","); cell cell = mcells[integer.valueof(selectedindexs[0])]; cell nextcell; if (selectedindexs.length > 1) { for (int i = 1; i < selectedindexs.length; i++) { nextcell = mcells[integer.valueof(selectedindexs[i])]; canvas.drawline(cell.getcenterx(), cell.getcentery(), nextcell.getcenterx(), nextcell.getcentery(), mpaintselected); cell = nextcell; } } if (!mfinish) { canvas.drawline(cell.getcenterx(), cell.getcentery(), mcurrentx, mcurrenty, mpaintselected); } } @override protected void onmeasure(int widthmeasurespec, int heightmeasurespec) { mwidth = getrealsize(widthmeasurespec); mheight = getrealsize(heightmeasurespec); setmeasureddimension(mwidth, mwidth); } private int getrealsize(int measurespc) { int result; int mode = measurespec.getmode(measurespc); int size = measurespec.getsize(measurespc); if (mode == measurespec.at_most || mode == measurespec.unspecified) { result = mcellwidth * 3 + mspace * 4; } else { result = size; } return result; } @override public boolean ontouchevent(motionevent event) { switch (event.getaction()) { case motionevent.action_down: if (mfinish) { for (int i = 0; i < 9; i++) { mcells[i].setselected(false); } mfinish = false; msbselected.delete(0, msbselected.length()); invalidate(); return false; } handledownevent(event); break; case motionevent.action_up: mfinish = true; toast.maketext(getcontext(), msbselected.tostring(), toast.length_short).show(); break; case motionevent.action_move: handlemoveevent(event); break; } return true; } private void handlemoveevent(motionevent event) { int index = findcellindex(event.getx(), event.gety()); if (index != -1) { mcells[index].setselected(true); msbselected.append(index).append(","); } invalidate(); mcurrentx = event.getx(); mcurrenty = event.gety(); } private void handledownevent(motionevent event) { int index = findcellindex(event.getx(), event.gety()); if (index != -1) { mcells[index].setselected(true); msbselected.append(index).append(","); invalidate(); } mcurrentx = event.getx(); mcurrenty = event.gety(); } private int findcellindex(float x, float y) { float cellx; float celly; int result = -1; for (int i = 0; i < 9; i++) { if (mcells[i].isselected()) { continue; } cellx = mcells[i].getcenterx(); celly = mcells[i].getcentery(); float tempx = cellx - x; float tempy = celly - y; float distance = (float) math.sqrt(tempx * tempx + tempy * tempy); if (distance < mcellradius) { result = i; break; } } return result; }} |
mainactivity.java如下：
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package com.xuliugen.jiugongge;import android.os.bundle;import android.support.v7.app.actionbaractivity;import android.view.menu;import android.view.menuitem;public class mainactivity extends actionbaractivity { @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); } @override public boolean oncreateoptionsmenu(menu menu) { getmenuinflater().inflate(r.menu.menu_main, menu); return true; } @override public boolean onoptionsitemselected(menuitem item) { int id = item.getitemid(); if (id == r.id.action_settings) { return true; } return super.onoptionsitemselected(item); }} |
另外还需要一个存放圆圈的javabean
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package com.xuliugen.jiugongge;/** * 代表每一个九宫格圆圈的javabean * @author xuliugenpc */public class cell { private float centerx; private float centery; private boolean selected; public cell(float x, float y) { centerx = x; centery = y; } public float getcenterx() { return centerx; } public void setcenterx(float centerx) { this.centerx = centerx; } public float getcentery() { return centery; } public void setcentery(float centery) { this.centery = centery; } public boolean isselected() { return selected; } public void setselected(boolean selected) { this.selected = selected; }} |
像素转换的工具类：
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package com.xuliugen.jiugongge;import android.content.context;/** * 手机屏幕px转dp和dp转px工具类 * @author xuliugenpc */public class densityutil { private static float scale; /** * 根据手机的分辨率从 dp 的单位 转成为 px(像素) */ public static int dip2px(context context, float dpvalue) { if (scale == 0) { scale = context.getresources().getdisplaymetrics().density; } return (int) (dpvalue * scale + 0.5f); } /** * 根据手机的分辨率从 px(像素) 的单位 转成为 dp */ public static int px2dip(context context, float pxvalue) { if (scale == 0) { scale = context.getresources().getdisplaymetrics().density; } return (int) (pxvalue / scale + 0.5f); }} |
以上就是android实现九宫格解锁的方法，希望本文所述对大家学习有所帮助。
