android自定義手勢解鎖View
阿新 • • 發佈:2019-01-26
有時候為了程式的安全性,我們經常要採取一些安全措施,就像我們常用的支付寶那樣,隔一定的時間再回到應用程式時會讓使用者利用手勢去解鎖應用程式,最近由於專案需求,也要求做這樣一個功能,當用戶切出本應用程式15分鐘後回來,讓使用者手勢解鎖,整個需求的難點就在如何實現這個手勢鎖,開始一點頭緒也沒有,沒有一點思路去實現這個手勢解鎖功能,在google了一番後看了一篇非常好的部落格後,按照博主的思路的確是可以實現一個十分不錯的手勢鎖View,也參考了下那位大神的程式碼,下面是我根據他的思路和程式碼片段實現的一個自定義手勢解鎖 View,先看效果圖.
這是自定義View的初始效果圖:
以下是繪製手勢時的效果圖:
下面是實現的demo程式碼:
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 { /** * 不同狀態的畫筆 */ 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<Integer> linedCycles = new ArrayList<Integer>(); private OnGestureFinishListener onGestureFinishListener; private String key; private int eventX, eventY; private boolean canContinue = true; private boolean result; private Timer timer; /** * 不同狀態下的色值 */ 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; } } } } /** * 繪製所需要繪製的內容 */ @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); } /** * 繪製大圓裡的小圓 * * @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) { // 設定為整條路徑的起點 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); } } /** * 根據手擇時觸控點的不同,修改對應的狀態值 */ @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() { // 回到初始狀態 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; } }
自定義圓類:
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; } }
思路:
1.自定義一個 View和MyCircle類,將九個MyCircle類的例項繪製到View中.
2.處理onTouch事件,根據不同的事件修改MyCircle例項的狀態,並呼叫更新invaildate更新View
3.重寫onDraw()方法,根據不同的狀態去重新繪製整個View