安卓開發(fā)|圖案解鎖4之保存密碼

一、今日目的

1.實現(xiàn)密碼保存
2.完結(jié)圖案解鎖

二、知識點

1. 記錄密碼

思路:用字符串表示密碼——將tag值拼入該字符串。既然要拼接所以不能用String,就定義一個StringBuilder(或者StringBuffer)變量。

代碼:
//保存密碼
    StringBuilder password;
//密碼
    String firpassword;//第一次設(shè)置的
    String orgpassword;;//原始密碼

如果某個點被點亮了,就加入密碼


password.append(selected.getTag());

沒有原始密碼,設(shè)置:

第一次密碼的設(shè)置

                        firpassword = password.toString();

第二次

                        if(firpassword.equals(password.toString())){
                            alterTextView.setText("密碼設(shè)置成功");
                            SharedPreferences ap = getSharedPreferences("tyn",MODE_PRIVATE);
                            SharedPreferences.Editor editor = ap.edit();
                            editor.putString("password",firpassword);
                            editor.commit();
                        }else {
                            alterTextView.setText("兩次密碼設(shè)置不一致,請重新輸入");
                            firpassword = null;
                        }

有原始密碼,輸入:
if(password.toString().equals(orgpassword) ){
                        alterTextView.setText("密碼正確");
                        for (ImageView dd:selectedList){
                            dd.setVisibility(View.INVISIBLE);
                            RelativeLayout relativeLayout = findViewById(R.id.root_layout);
                            relativeLayout.findViewWithTag(((Integer)dd.getTag()+100)).setVisibility(View.VISIBLE);

                        }
                    }else {
                        alterTextView.setText("密碼錯誤請重新輸入");
                        for(ImageView dd :selectedList){
                            dd.setVisibility(View.INVISIBLE);
                            RelativeLayout relativeLayout = findViewById(R.id.root_layout);
                            ImageView imageView =relativeLayout.findViewWithTag((Integer)dd.getTag()+100);
                            wSelectedList.add(imageView);
                        }
                        for(ImageView ww : wSelectedList){
                            ww.setVisibility(View.VISIBLE);
                        }
                    }

2. 手指離開界面實現(xiàn)密碼清空和界面清空

界面清空的思路:做成一個函數(shù),在需要的地方調(diào)用

代碼:
public void clean(){
        password.setLength(0);
        for(ImageView i:selectedList){
            i.setVisibility(View.INVISIBLE);
        }
        for(ImageView i:wSelectedList){
            i.setVisibility(View.INVISIBLE);
        }
        selectedList.clear();
        wSelectedList.clear();
    }

3. 創(chuàng)建文本視圖(昨天在.xml里的TextView終于有用了)

直接上代碼:
//顯示的文本信息
    TextView alterTextView;

相應(yīng)的地方,對應(yīng)一下文本輸入

alterTextView.setText("請確認密碼");

alterTextView.setText("密碼設(shè)置成功");

alterTextView.setText("兩次密碼設(shè)置不一致,請重新輸入");

alterTextView.setText("密碼正確");

alterTextView.setText("密碼錯誤請重新輸入");

4. Android里的4種數(shù)據(jù)存儲

  • sharedPreferance偏好設(shè)置
  • file 小
  • salite 大
  • network
    ps:前三種都是儲存再本地

三、實際應(yīng)用(完整代碼)

package com.example.day3jieshuo;
import androidx.appcompat.app.AppCompatActivity;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    //定義一個數(shù)組 保存每個點的控件
    ArrayList<ImageView> dotsList;
    ArrayList<ImageView> rdotsList;
    ArrayList<Integer> lineViewTags;
    int tag;
    int wtag;
    //保存上一次被點亮的點的對象
    ImageView lastSelectedDot;

    //保存密碼
    StringBuilder password;

    //顯示的文本信息
    TextView alterTextView;

    //已經(jīng)點亮的控件
    ArrayList<ImageView> selectedList;

    ArrayList<ImageView> wSelectedList;

    //密碼
    String firpassword;
    String orgpassword;
    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        //判斷是否已經(jīng)顯示
        if (hasFocus){
                //獲取容器?
                RelativeLayout rl = findViewById(R.id.root_layout);
                //獲取背景視圖
                ImageView iv = findViewById(R.id.opView);
                //獲取x 和 y坐標
                int x = iv.getLeft();
                int y = iv.getTop();
                //獲取屏幕密度
                float scale = getResources().getDisplayMetrics().density;

                tag = 12;
                wtag = 112;
                //創(chuàng)建橫線 6條
                for (int i = 0; i < 3; i++) {
                    for (int j = 0; j < 2; j++) {
                        //創(chuàng)建一個視圖用于顯示線
                        ImageView lineView = new ImageView(this);
                        lineView.setBackgroundResource(R.drawable.normal_highlight1);
                        lineView.setVisibility(View.INVISIBLE);

                        //設(shè)置tag值
                        lineView.setTag(tag);
                        //將tag值存入數(shù)組
                        lineViewTags.add(tag);
                        tag += 11;

                        //創(chuàng)建布局參數(shù)
                        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams( ViewGroup.LayoutParams.WRAP_CONTENT,  ViewGroup.LayoutParams.WRAP_CONTENT);                    params.leftMargin = (int)(x + 46.6*scale) + (int)(99*scale*j);                    params.topMargin = (int)(y + 170*scale) + (int)(99*scale*i);                    rl.addView(lineView, params);
                        params.leftMargin = (int)(x + 50*scale) + (int)(99*scale*j);
                        params.topMargin = (int)(y + 170*scale) + (int)(99*scale*i);
                        //創(chuàng)建一個視圖用于顯示線
                        ImageView wLineView = new ImageView(this);
                        wLineView.setVisibility(View.INVISIBLE);
                        wLineView.setBackgroundResource(R.drawable.wrong_highlight1);


                        //設(shè)置tag值
                        wLineView.setTag(wtag);
                        //將tag值存入數(shù)組
                        lineViewTags.add(wtag);
                        wtag += 11;

                        rl.addView(wLineView,params);
                    }
                    tag += 11;
                    wtag += 11;
                }


                tag = 14;
                //創(chuàng)建豎線 4條
                for (int i = 0; i < 2; i++) {
                    for (int j = 0; j < 3; j++) {
                        //創(chuàng)建一個視圖用于顯示線
                        ImageView lineView = new ImageView(this);
                        lineView.setBackgroundResource(R.drawable.normal_highlight2);
                        lineView.setVisibility(View.INVISIBLE);

                        //設(shè)置tag值
                        lineView.setTag(tag);
                        //將tag值存入數(shù)組
                        lineViewTags.add(tag);
                        tag += 11;

                        //創(chuàng)建布局參數(shù)
                        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);                    params.leftMargin = (int)(x + 42*scale) + (int)(99*scale*j);                    params.topMargin = (int)(y + 170*scale) + (int)(99*scale*i);                    rl.addView(lineView, params);
                    }
                }

                tag = 24;
                int rtag = 15;
                wtag = 124;
                int wrtag = 115;
                //創(chuàng)建斜線
                for (int i = 0; i < 2; i++) {
                    for (int j = 0; j < 2; j++) {
                        //創(chuàng)建?一個視圖用于顯示線
                        ImageView rLineView = new ImageView(this);
                        //設(shè)置圖片
                        rLineView .setBackgroundResource(R.drawable.normal_highlight3);
                        //設(shè)置tag值
                        rLineView.setTag(rtag);
                        //將tag值存入數(shù)組
                        lineViewTags.add(rtag);
                        rtag += 11;

                        //創(chuàng)建布局參數(shù)
                        rLineView.setVisibility(View.INVISIBLE);
                        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);                    params.leftMargin = (int)(x + 42*scale) + (int)(99*scale*j);                    params.topMargin = (int)(y + 170*scale) + (int)(99*scale*i);                    rl.addView(rLineView, params);

                        //
                        ImageView lLineView = new ImageView(this);
                        lLineView.setVisibility(View.INVISIBLE);
                        lLineView.setBackgroundResource(R.drawable.normal_highlight4);

                        lLineView.setTag(tag);
                        lineViewTags.add(tag);
                        tag += 11;

                        params.leftMargin = (int)(x + 50*scale) + (int)(99*scale*j);
                        params.topMargin = (int)(y + 170*scale) + (int)(99*scale*i);
                        rl.addView(lLineView,params);

                        //wrong
                        //創(chuàng)建?一個視圖用于顯示線
                        ImageView wrLineView = new ImageView(this);
                        //設(shè)置圖片
                        wrLineView .setBackgroundResource(R.drawable.wrong_highlight3);
                        //設(shè)置tag值
                        wrLineView.setTag(wrtag);
                        //將tag值存入數(shù)組
                        lineViewTags.add(wrtag);
                        wrtag += 11;

                        //創(chuàng)建布局參數(shù)
                        params.leftMargin = (int)(x + 50*scale) + (int)(99*scale*j);
                        params.topMargin = (int)(y + 174*scale) + (int)(99*scale*i);
                        wrLineView.setVisibility(View.INVISIBLE);


                        //
                        ImageView wlLineView = new ImageView(this);
                        wlLineView.setVisibility(View.INVISIBLE);
                        wlLineView.setBackgroundResource(R.drawable.wrong_highlight4);

                        wlLineView.setTag(wtag);
                        lineViewTags.add(wtag);
                        wtag += 11;

                        rl.addView(wrLineView,params);
                        rl.addView(wlLineView,params);
                    }
                    rtag += 11;
                    tag += 11;
                    wtag += 11;
                    wrtag += 11;
                }

                tag = 1;
                //創(chuàng)建9個綠點
                for (int i = 0; i < 3; i++) {
                    for (int j = 0; j < 3; j++) {
                        //創(chuàng)建?用于顯示點的視圖
                        ImageView dotView = new ImageView(this);;

                        dotView.setTag(tag);
                        tag += 1;

                        //隱藏視圖
                        dotView.setVisibility(View.INVISIBLE);
                        //顯示對應(yīng)的圖片
                        dotView.setBackgroundResource(R.drawable.selected_dot);
                         //創(chuàng)建控件的尺寸
                        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);                    params.leftMargin = (int)(x + 35.33*scale) + (int)(98.66*scale*i);                    params.topMargin = (int)(y + 162*scale) + (int)(98.66*scale*j);

                        params.leftMargin = (int)(x + 35.33*scale) + (int)(99*scale*j);
                        params.topMargin = (int)(y + 162*scale) + (int)(99*scale*i);

                        //將控件添加到容器中
                        rl.addView(dotView, params);
                        //將這個控件添加到數(shù)組
                         dotsList.add(dotView);
                    }
                }

            tag = 101;
            //創(chuàng)建9個紅點
            for (int j = 0; j < 3; j++) {
                for (int i = 0; i < 3; i++) {
                    //創(chuàng)建?用于顯示點的視圖
                    ImageView rdotView = new ImageView(this);;

                    rdotView.setTag(tag);
                    tag += 1;

                    //隱藏視圖
                    rdotView.setVisibility(View.INVISIBLE);
                    //顯示對應(yīng)的圖片
                    rdotView.setBackgroundResource(R.drawable.wrong_dot);
                    //創(chuàng)建控件的尺寸
                    RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);                    params.leftMargin = (int)(x + 35.33*scale) + (int)(98.66*scale*i);                    params.topMargin = (int)(y + 162*scale) + (int)(98.66*scale*j);

                    //將控件添加到容器中
                    rl.addView(rdotView, params);
                    //將這個控件添加到數(shù)組
                    rdotsList.add(rdotView);
                }
            }
            }
    }
    //監(jiān)聽觸摸事件
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        //獲取事件的類型
        int action = event.getAction();
        ImageView selected;
        float x;
        float y;

        //判斷是什么事件
        switch (action){
            case MotionEvent.ACTION_DOWN:
                //點擊
                //獲取觸摸點的坐標
                x = event.getX();
                y = event.getY();
                //判斷x y是不是在某個點的范圍內(nèi)
                selected = dotOfTouch(x, y);
                if (selected != null) {
                    //點亮
                    selected.setVisibility(View.VISIBLE);
                    //記錄當前這個點
                    lastSelectedDot = selected;
                    password.append(selected.getTag());
                    selectedList.add(selected);
                }
                break;
            case MotionEvent.ACTION_MOVE:
                //滑動
                //獲取觸摸點的坐標
                x = event.getX();
                y = event.getY();
                //判斷x y是不是在某個點的范圍內(nèi)
                selected = dotOfTouch(x, y);
                if (selected != null) {
                    //判斷這個點是不是起始點
                    if(lastSelectedDot == null){
                        //是起始點
                        selected.setVisibility(View.VISIBLE);
                        //記錄
                        lastSelectedDot = selected;
                    }else{
                        //不是起始點
                        //獲取上一個點和當前點的tag

                        int lTag = (Integer)lastSelectedDot.getTag();//因為getTag得出的是Object類型的,需要轉(zhuǎn)換
                        int cTag = (Integer)selected.getTag();

                        //組成線的tag
                        int lineTag = lTag > cTag ? cTag*10+lTag : lTag*10+cTag;
//                        System.out.println(lTag+"_____"+cTag+"_____"+lineTag);

                        //判斷這條線是否存在
                        if(lineViewTags.contains(lineTag)){
                            //線存在  點亮點
                            selected.setVisibility(View.VISIBLE);
                            password.append(selected.getTag());
                            selectedList.add(selected);

                            //點亮這條線
                            //獲取容器對象
                            RelativeLayout rl = findViewById(R.id.root_layout);

                            //通過tag值找容器里對應(yīng)的子控件
                            ImageView iv = rl.findViewWithTag(lineTag);
                            iv.setVisibility(View.VISIBLE);
                            selectedList.add(iv);

                            //記錄這個點
                            lastSelectedDot = selected;
                        }
                    }
                }
                break;
            case MotionEvent.ACTION_UP:
                //System.out.println(password);
                //離開
                if(orgpassword == null){
                    //沒有密碼。設(shè)置
                    if(firpassword == null){
                        //第一次
                        firpassword = password.toString();
                        alterTextView.setText("請確認密碼");
                    }else {
                        //第二次
                        if(firpassword.equals(password.toString())){
                            alterTextView.setText("密碼設(shè)置成功");
                            SharedPreferences ap = getSharedPreferences("tyn",MODE_PRIVATE);
                            SharedPreferences.Editor editor = ap.edit();
                            editor.putString("password",firpassword);
                            editor.commit();
                        }else {
                            alterTextView.setText("兩次密碼設(shè)置不一致,請重新輸入");
                            firpassword = null;
                        }
                    }
                }else {
                    //輸入密碼
                    if(password.toString().equals(orgpassword) ){
                        alterTextView.setText("密碼正確");
                        for (ImageView dd:selectedList){
                            dd.setVisibility(View.INVISIBLE);
                            RelativeLayout relativeLayout = findViewById(R.id.root_layout);
                            relativeLayout.findViewWithTag(((Integer)dd.getTag()+100)).setVisibility(View.VISIBLE);

                        }
                    }else {
                        alterTextView.setText("密碼錯誤請重新輸入");
                        for(ImageView dd :selectedList){
                            dd.setVisibility(View.INVISIBLE);
                            RelativeLayout relativeLayout = findViewById(R.id.root_layout);
                            ImageView imageView =relativeLayout.findViewWithTag((Integer)dd.getTag()+100);
                            wSelectedList.add(imageView);
                        }
                        for(ImageView ww : wSelectedList){
                            ww.setVisibility(View.VISIBLE);
                        }
                    }
                }
                //清空
                clean();

                break;
            default:
                break;
        }
        return true;
    }

    //寫?個方法 處理 判斷觸摸點是否在控件內(nèi)部
    public ImageView dotOfTouch(float x, float y){
        for (ImageView dot:dotsList){
            //獲取這個dot相對于屏幕的x y
            int[] loc = new int[2];
            dot.getLocationOnScreen(loc);
            int dx = loc[0];
            int dy = loc[1];
            //獲取右邊的偏移量量
            int r = dx + dot.getWidth();
            //獲取最底部的偏移量量
            int b = dy + dot.getHeight();
            //判斷這個點是否在這個范圍內(nèi)
            if ((x <= r && x >= dx) && (y <= b && y >= dy)){
                return dot;
            }
        }
        return null;
    }

    //寫一個方法 清空
    public void clean(){
        password.setLength(0);
        for(ImageView i:selectedList){
            i.setVisibility(View.INVISIBLE);
        }
//        for(ImageView i:wSelectedList){
//            i.setVisibility(View.INVISIBLE);
//        }
        selectedList.clear();
        wSelectedList.clear();
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //實例化
        dotsList = new ArrayList<>();
        lineViewTags = new ArrayList<>();
        password = new StringBuilder();
        alterTextView = findViewById(R.id.tv_alert);
        selectedList = new ArrayList<>();
        wSelectedList = new ArrayList<>();
        rdotsList =new ArrayList<>();
        //查找偏好設(shè)置里面是否有tyn
        SharedPreferences sp = getSharedPreferences("tyn",MODE_PRIVATE);
        //獲取tyn對應(yīng)的密碼
        orgpassword = sp.getString("password",null);
        if(orgpassword == null){
            alterTextView.setText("請設(shè)置密碼");
        }else {
            alterTextView.setText("請輸入密碼");
        }

//        //讀
//        SharedPreferences sp = getSharedPreferences("abc",0);
//        //寫
//        SharedPreferences.Editor editor = sp.edit();
//        editor.putString("tyn","123");
//        editor.commit();
//
//        String result = sp.getString("tyn",null);
//        System.out.println(result);
    }
}

四、心得

雞湯時間:

常識和 經(jīng)驗有時候能幫助我們少走彎路,有時候卻禁錮了我們的思想,讓我們只能墨守成規(guī),循規(guī)蹈矩。

心里話showtime:

在學了數(shù)組遍歷之后,在思考做那個界面清除的時候就會相到用數(shù)組然后遍歷數(shù)組判斷點亮的控件再去把它們一個個的隱藏起來,這個方法是可以的但是比較麻煩,所以有時候有了經(jīng)驗也要去思考有沒有更好的方法來實現(xiàn)需求。

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