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：
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。
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