Android实现九宫格解锁的方法

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：

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  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

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：

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

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：

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。