安卓中图案解锁的实现原理和实现过程

由上图，可以看出，图案中手势的记录是1-9或0-8的，保存的顺序就是密码，当然有些是可以重复的，为了安全，肯定不能直接存原顺序，一定是要加密处理的，如MD5或Hash散列。（作者： a day a better）图案解锁中自定义View,是其中最为关键的一部分。下面是自定义LockView的实现，里面的注释写的很详细了。

<span style="font-size:14px;">package com.example.patternlock;import java.util.ArrayList;
import java.util.List;import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;public class LockView extends View {private boolean inited = false;Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);// 抗锯齿Paint pressPaint = new Paint(); //按下时的画笔Paint errorPaint = new Paint(); //错误时的画笔private Bitmap bitmapPointError;private Bitmap bitmapPointPress;private Bitmap bitmapPointNormal;private float bitmapR; // 点的半径private boolean isDraw = false; //是否正在绘制float mouseX, mouseY;private Point [][] points = new Point[3][3];private ArrayList<point> pointList = new ArrayList<point>(); //保存经过的点private ArrayList<integer> passList = new ArrayList<integer>();private OnDrawFinishedListener listener;public LockView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);// TODO Auto-generated constructor stub}public LockView(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stub}public LockView(Context context) {super(context);// TODO Auto-generated constructor stub}@Overridepublic boolean onTouchEvent(MotionEvent event) {mouseX = event.getX();mouseY = event.getY();int [] ij;int i , j;switch (event.getAction()) {case MotionEvent.ACTION_DOWN:resetPoints();ij = getSelectedPoint();if(ij != null){isDraw = true;i = ij[0];j = ij[1];points[i][j].state = Point.STATE_PRESS;pointList.add(points[i][j]);passList.add(i * 3 + j);}break;case MotionEvent.ACTION_MOVE:if(isDraw){ij = getSelectedPoint();if(ij != null){i = ij[0];j = ij[1];if(!pointList.contains(points[i][j])){points[i][j].state = Point.STATE_PRESS;pointList.add(points[i][j]);passList.add(i * 3 + j);}               }}break;case MotionEvent.ACTION_UP:boolean valid = false;if(listener != null && isDraw){valid = listener.OnDrawFinished(passList);}if(!valid){for (Point p:pointList) {p.state = Point.STATE_ERROR;}}isDraw = false;break;default:break;}this.postInvalidate();return true;}private int[] getSelectedPoint() {Point pMouse = new Point(mouseX,mouseY);for (int i = 0; i < points.length; i++) {for (int j = 0; j < points[i].length; j++) {if(points[i][j].distance(pMouse) < bitmapR){int [] result = new int [2];result[0] = i;result[1] = j;return result;}}}return null;}public void resetPoints() {passList.clear();pointList.clear();for (int i = 0; i < points.length; i++){for (int j = 0; j < points[i].length; j++){points[i][j].state = Point.STATE_NORMOL;}}this.postInvalidate();}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);if(!inited){init();}drawPoints(canvas);if(pointList.size() > 0){ //画线 2->3,3->5 ...Point a = pointList.get(0);for (int i = 1;i < pointList.size(); i++){Point b = pointList.get(i);drawLine(canvas, a, b);a = b;}if(isDraw){ //  画最后一个点drawLine(canvas, a, new Point(mouseX, mouseY));}}}private void drawLine(Canvas canvas, Point a, Point b) {if(a.state == Point.STATE_ERROR){canvas.drawLine(a.x, a.y, b.x, b.y, errorPaint);}else if(a.state == Point.STATE_PRESS){canvas.drawLine(a.x, a.y, b.x, b.y, pressPaint);}}private void drawPoints(Canvas canvas) {for (int i = 0; i < points.length; i++) {for (int j = 0; j < points[i].length; j++) {if(points[i][j].state == Point.STATE_NORMOL){// normolcanvas.drawBitmap(bitmapPointNormal, points[i][j].x - bitmapR, points[i][j].y - bitmapR, paint);}else if(points[i][j].state == Point.STATE_PRESS){// presscanvas.drawBitmap(bitmapPointPress, points[i][j].x - bitmapR, points[i][j].y - bitmapR, paint);}else{// errorcanvas.drawBitmap(bitmapPointError, points[i][j].x - bitmapR, points[i][j].y - bitmapR, paint);}}}}private void init() {pressPaint.setColor(Color.YELLOW);pressPaint.setStrokeWidth(4);errorPaint.setColor(Color.RED);errorPaint.setStrokeWidth(4);bitmapPointError = BitmapFactory.decodeResource(getResources(), R.drawable.error);bitmapPointNormal = BitmapFactory.decodeResource(getResources(), R.drawable.normal);bitmapPointPress = BitmapFactory.decodeResource(getResources(), R.drawable.press);bitmapR = bitmapPointError.getWidth() / 2; //三种点的大小一样int width = getWidth();int height = getHeight();int offset = Math.abs(width - height) / 2;int offsetX, offsetY;int space;if(width > height){space = height / 4;offsetX = offset;offsetY = 0;}else{space = width / 4;offsetX = 0;offsetY = offset;}points[0][0] = new Point(offsetX +space , offsetY + space);points[0][1] = new Point(offsetX + 2*space , offsetY + space);points[0][2] = new Point(offsetX + 3 * space , offsetY + space);points[1][0] = new Point(offsetX +space, offsetY + 2 * space);points[1][1] = new Point(offsetX + 2 * space , offsetY + 2 * space);points[1][2] = new Point(offsetX + 3 * space , offsetY + 2 * space);points[2][0] = new Point(offsetX +space, offsetY + 3 * space);points[2][1] = new Point(offsetX + 2 * space , offsetY + 3 * space);points[2][2] = new Point(offsetX + 3 * space , offsetY + 3 * space);inited = true; //初始化完成}public interface OnDrawFinishedListener{boolean OnDrawFinished(List<integer> passList);}public void setOnDrawFinishedListener(OnDrawFinishedListener listener){this.listener = listener;}}
</integer></integer></integer></point></point></span>

设置密码：

<span style="font-size:14px;">package com.jikexueyuan.screenlock;import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;import java.util.List;public class SettingActivity extends ActionBarActivity {List<integer> passList;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_setting);final GestureLock lock = (GestureLock)findViewById(R.id.LockView);Button btn_reset = (Button)findViewById(R.id.btn_reset);Button btn_save = (Button)findViewById(R.id.btn_save);lock.setOnDrawFinishedListener(new GestureLock.OnDrawFinishedListener() {@Overridepublic boolean OnDrawFinished(List<integer> passList) {if (passList.size() < 3){Toast.makeText(SettingActivity.this, 密码不能少于3个点, Toast.LENGTH_SHORT).show();return false;}else {SettingActivity.this.passList = passList;return true;}}});btn_reset.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {lock.resetPoints();}});btn_save.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {if (passList != null){StringBuilder sb = new StringBuilder();for (Integer i : passList){sb.append(i);}SharedPreferences sp = SettingActivity.this.getSharedPreferences(password, SettingActivity.this.MODE_PRIVATE);SharedPreferences.Editor editor = sp.edit();editor.putString(password, sb.toString());editor.commit();Toast.makeText(SettingActivity.this, 保存完成, Toast.LENGTH_SHORT).show();}}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.menu_setting, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();//noinspection SimplifiableIfStatementif (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}
}
</integer></integer></span>

检验密码：

package com.example.patternlock;import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.Toast;import java.util.List;import com.example.patternlock.LockView.OnDrawFinishedListener;public class LockActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_lock);SharedPreferences sp = getSharedPreferences(password, this.MODE_PRIVATE);final String password = sp.getString(password, );LockView lock = (LockView)findViewById(R.id.LockView);lock.setOnDrawFinishedListener(new OnDrawFinishedListener() {@Overridepublic boolean OnDrawFinished(List<integer> passList) {StringBuilder sb = new StringBuilder();for (Integer i : passList){sb.append(i);}if (sb.toString().equals(password)){Toast.makeText(LockActivity.this, 正确, Toast.LENGTH_SHORT).show();return true;}else{Toast.makeText(LockActivity.this, 错误, Toast.LENGTH_SHORT).show();return false;}}});}
}
</integer>

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