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这篇文章将为大家详细讲解有关怎么在android中通过自定义View实现手势解锁功能，文章内容质量较高，因此小编分享给大家做个参考，希望大家阅读完这篇文章后对相关知识有一定的了解。
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package com.example.gesturelock;
import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import com.example.gesturelock.GestureLockView.OnGestureFinishListener;
public class MyGestureLockView extends View {
/**
* 不同状态的画笔
*/
private Paint paintNormal;
private Paint paintOnTouch;
private Paint paintInnerCycle;
private Paint paintLines;
private Paint paintKeyError;
private MyCycle[] cycles;
private Path linePath = new Path();
private List linedCycles = new ArrayList();
private OnGestureFinishListener onGestureFinishListener;
private String key;
private int eventX, eventY;
private boolean canContinue = true;
private boolean result;
private Timer timer;
/**
* 不同状态下的色值
*/
private int OUT_CYCLE_NORMAL = Color.rgb(108, 119, 138); // ������Բ��ɫ
private int OUT_CYCLE_ONTOUCH = Color.rgb(025, 066, 103); // ѡ����Բ��ɫ
private int INNER_CYCLE_ONTOUCH = Color.rgb(002, 210, 255); // ѡ����Բ��ɫ
private int LINE_COLOR = Color.argb(127, 002, 210, 255); // ��������ɫ
private int ERROR_COLOR = Color.argb(127, 255, 000, 000);
public void setOnGestureFinishListener(
OnGestureFinishListener onGestureFinishListener) {
this.onGestureFinishListener = onGestureFinishListener;
}
public void setKey(String key) {
this.key = key;
}
public MyGestureLockView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
public MyGestureLockView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public MyGestureLockView(Context context) {
super(context);
init();
}
private void init() {
paintNormal = new Paint();
paintNormal.setAntiAlias(true);
paintNormal.setStrokeWidth(3);
paintNormal.setStyle(Paint.Style.STROKE);
paintOnTouch = new Paint();
paintOnTouch.setAntiAlias(true);
paintOnTouch.setStrokeWidth(3);
paintOnTouch.setStyle(Paint.Style.STROKE);
paintInnerCycle = new Paint();
paintInnerCycle.setAntiAlias(true);
paintInnerCycle.setStyle(Paint.Style.FILL);
paintLines = new Paint();
paintLines.setAntiAlias(true);
paintLines.setStyle(Paint.Style.STROKE);
paintLines.setStrokeWidth(6);
paintKeyError = new Paint();
paintKeyError.setAntiAlias(true);
paintKeyError.setStyle(Paint.Style.STROKE);
paintKeyError.setStrokeWidth(3);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// TODO Auto-generated method stub
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right,
int bottom) {
// TODO Auto-generated method stub
super.onLayout(changed, left, top, right, bottom);
int perSize = 0;
if (cycles == null && (perSize = getWidth() / 6) > 0) {
cycles = new MyCycle[9];
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
MyCycle cycle = new MyCycle();
cycle.setNum(i * 3 + j);
cycle.setOx(perSize * (j * 2 + 1));
cycle.setOy(perSize * (i * 2 + 1));
cycle.setR(perSize * 0.5f);
cycles[i * 3 + j] = cycle;
}
}
}
}
/**
* 绘制所需要绘制的内容
*/
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
for (int i = 0; i < cycles.length; i++) {
if (!canContinue && !result) {
paintOnTouch.setColor(ERROR_COLOR);
paintInnerCycle.setColor(ERROR_COLOR);
paintLines.setColor(ERROR_COLOR);
} else if (cycles[i].isOnTouch()) {
paintOnTouch.setColor(OUT_CYCLE_ONTOUCH);
paintInnerCycle.setColor(INNER_CYCLE_ONTOUCH);
paintLines.setColor(LINE_COLOR);
} else {
paintNormal.setColor(OUT_CYCLE_NORMAL);
paintInnerCycle.setColor(INNER_CYCLE_ONTOUCH);
paintLines.setColor(LINE_COLOR);
}
if (cycles[i].isOnTouch()) {
canvas.drawCircle(cycles[i].getOx(), cycles[i].getOy(),
cycles[i].getR(), paintOnTouch);
drawInnerBuleCycle(cycles[i], canvas);
} else {
canvas.drawCircle(cycles[i].getOx(), cycles[i].getOy(),
cycles[i].getR(), paintNormal);
}
}
drawLine(canvas);
}
/**
* 绘制大圆里的小圆
*
* @param canvas
*/
private void drawInnerBuleCycle(MyCycle cycle, Canvas canvas) {
canvas.drawCircle(cycle.getOx(), cycle.getOy(), cycle.getR() / 3,
paintInnerCycle);
}
private void drawLine(Canvas canvas) {
linePath.reset();
if (linedCycles.size() > 0) {
for (int i = 0; i < linedCycles.size(); i++) {
int index = linedCycles.get(i);
if (i == 0) {
// 设置为整条路径的起点
linePath.moveTo(cycles[index].getOx(), cycles[i].getOy());
} else {
linePath.lineTo(cycles[i].getOx(), cycles[i].getOy());
}
}
linePath.lineTo(eventX, eventY);
canvas.drawPath(linePath, paintLines);
}
}
/**
* 根据手择时触摸点的不同,修改对应的状态值
*/
@Override
public boolean onTouchEvent(MotionEvent event) {
if (canContinue) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
eventX = (int) event.getX();
eventY = (int) event.getY();
for (int i = 0; i < cycles.length; i++) {
if (cycles[i].isPointIn(eventX, eventY)) {
cycles[i].setOnTouch(true);
if (!linedCycles.contains(cycles[i].getNum())) {
linedCycles.add(cycles[i].getNum());
}
}
}
break;
case MotionEvent.ACTION_UP:
canContinue = false;
StringBuffer sb = new StringBuffer();
for (int i = 0; i < linedCycles.size(); i++) {
sb.append(linedCycles.get(i));
}
result = key.equals(sb.toString());
if (onGestureFinishListener != null) {
onGestureFinishListener.OnGestureFinish(result);
}
timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
// 回到初始状态
eventX = eventY = 0;
for (int i = 0; i < cycles.length; i++) {
cycles[i].setOnTouch(false);
}
linedCycles.clear();
linePath.reset();
canContinue = true;
postInvalidate();
}
}, 1000);
break;
}
}
invalidate();
return true;
}
} 自定义圆类:
package com.example.gesturelock;
public class MyCycle {
private int ox; // Բ�ĺ�����
private int oy; // Բ��������
private float r; // �뾶����
private Integer num; // ������ֵ
private boolean onTouch; // false=δѡ��
public int getOx() {
return ox;
}
public void setOx(int ox) {
this.ox = ox;
}
public int getOy() {
return oy;
}
public void setOy(int oy) {
this.oy = oy;
}
public float getR() {
return r;
}
public void setR(float r) {
this.r = r;
}
public Integer getNum() {
return num;
}
public void setNum(Integer num) {
this.num = num;
}
public boolean isOnTouch() {
return onTouch;
}
public void setOnTouch(boolean onTouch) {
this.onTouch = onTouch;
}
public boolean isPointIn(int x, int y) {
double distance = Math.sqrt((x - ox) * (x - ox) + (y - oy) * (y - oy));
return distance < r;
}
}Android是一种基于Linux内核的自由及开放源代码的操作系统，主要使用于移动设备，如智能手机和平板电脑，由美国Google公司和开放手机联盟领导及开发。
关于怎么在android中通过自定义View实现手势解锁功能就分享到这里了，希望以上内容可以对大家有一定的帮助，可以学到更多知识。如果觉得文章不错，可以把它分享出去让更多的人看到。