Android九宫格解锁的实现

本文主要是介绍Android九宫格解锁的实现，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

演示效果如下

主要代码如下

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.SudokuViewandroid: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;}}@Overrideprotected 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);}}@Overrideprotected 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;}@Overridepublic 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 {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.menu_main, menu);return true;}@Overridepublic 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);}
}

全部资源都在这里了，不上传项目代码了哦。

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