padding_left = 0;
Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888);
Canvas c = new Canvas(bp);
code = createCode();
c.drawColor(Color.WHITE);
Paint paint = new Paint();
paint.setTextSize(font_size);
for (int i = 0; i < code.length(); i++) {
randomTextStyle(paint);
randomPadding();
c.drawText(code.charAt(i) + “”, padding_left, padding_top, paint);
}
for (int i = 0; i < line_number; i++) {
drawLine(c, paint);
}
c.save( Canvas.ALL_SAVE_FLAG );
c.restore();//
return bp;
}
public String getCode() {
return code;
}
private String createCode() {
StringBuilder buffer = new StringBuilder();
for (int i = 0; i < codeLength; i++) {
buffer.append(CHARS[random.nextInt(CHARS.length)]);
}
return buffer.toString();
}
private void drawLine(Canvas canvas, Paint paint) {
int color = randomColor();
int startX = random.nextInt(width);
int startY = random.nextInt(height);
int stopX = random.nextInt(width);
int stopY = random.nextInt(height);
paint.setStrokeWidth(1);
paint.setColor(color);
canvas.drawLine(startX, startY, stopX, stopY, paint);
}
private int randomColor() {
return randomColor(1);
}
private int randomColor(int rate) {
int red = random.nextInt(256) / rate;
int green = random.nextInt(256) / rate;
int blue = random.nextInt(256) / rate;
return Color.rgb(red, green, blue);
}
private void randomTextStyle(Paint paint) {
int color = randomColor();
paint.setColor(color);
paint.setFakeBoldText(random.nextBoolean());
float skewX = random.nextInt(11) / 10;
skewX = random.nextBoolean() ? skewX : -skewX;
paint.setTextSkewX(skewX);
}
private void randomPadding() {
padding_left += base_padding_left + random.nextInt(range_padding_left);
padding_top = base_padding_top + random.nextInt(range_padding_top);
}
}
内部提供方法初始化和获取验证码内容
image_code.setImageBitmap(Code.getInstance().createBitmap()); //初始化验证码
Code.getInstance().getCode(); //获取验证码
计时器
public abstract class CountDownTimer {
/**
- Millis since epoch when alarm should stop.
执行的总时间
*/
private final long mMillisInFuture;
/**
- The interval in millis that the user receives callbacks
时间间隔
*/
private final long mCountdownInterval;
// 停止时间
private long mStopTimeInFuture;
/**
-
@param millisInFuture The number of millis in the future from the call
-
to {@link #start()} until the countdown is done and {@link #onFinish()}
-
is called.
-
@param countDownInterval The interval along the way to receive
-
{@link #onTick(long)} callbacks.
两参数构造函数，总时间，时间间隔
*/
public CountDownTimer(long millisInFuture, long countDownInterval) {
mMillisInFuture = millisInFuture;
mCountdownInterval = countDownInterval;
}
/**
- Cancel the countdown.
取消到timer
*/
public final void cancel() {
mHandler.removeMessages(MSG);
}
/**
- Start the countdown.
开始
*/
public synchronized final CountDownTimer start() {
if (mMillisInFuture <= 0) {
onFinish();
return this;
}
// 停止时间 = 系统启动时间 + 总计时间
mStopTimeInFuture = SystemClock.elapsedRealtime() + mMillisInFuture;
mHandler.sendMessage(mHandler.obtainMessage(MSG));
return this;
}
/**
-
Callback fired on regular interval.
-
@param millisUntilFinished The amount of time until finished.
*/
public abstract void onTick(long millisUntilFinished);
/**
- Callback fired when the time is up.
*/
public abstract void onFinish();
private static final int MSG = 1;
// handles counting down
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
synchronized (CountDownTimer.this) {
// 计算剩余总时间
final long millisLeft = mStopTimeInFuture - SystemClock.elapsedRealtime();
// 小于等于 0 ，回调 onFinish
if (millisLeft <= 0) {
onFinish();
} else if (millisLeft < mCountdownInterval) { // 小于计时间隔 ，delayed 一个消息
// no tick, just delay until done
sendMessageDelayed(obtainMessage(MSG), millisLeft);
} else {
long lastTickStart = SystemClock.elapsedRealtime();
onTick(millisLeft);
// take into account user’s onTick taking time to execute
long delay = lastTickStart + mCountdownInterval - SystemClock.elapsedRealtime();
// special case: user’s onTick took more than interval to
// complete, skip to next interval
while (delay < 0) delay += mCountdownInterval;
sendMessageDelayed(obtainMessage(MSG), delay);
}
}
}
};
使用：倒计时
final CountDownTimer timer = new CountDownTimer(60000, 1000) {
@Override
public void onTick(long millisUntilFinished) {
get_verfiy_code.setText(millisUntilFinished/1000 + “秒”);
}
@Override
public void onFinish() {
get_verfiy_code.setEnabled(true);
get_verfiy_code.setText(“获取验证码”);
}
};
点击按钮的时候：
get_verfiy_code.setEnabled(false);
timer.start();
popupwinow全部如下：
/**
-
Created by
-
xiaomi on 2017/9/8.
*/
public class VerifyPopupWindow {
/**
- 手机验证popupwindow
*/
private EditText phone_number;
private EditText input_image_code;
private ImageView image_code;
private EditText input_code;
private Button sure;
private String inputcode;
private String realCode;
private Button no_verify;
private CustomPopWindow mPopWindow;
private Button get_verfiy_code;
private Context mContext;
public VerifyPopupWindow(Context context){
this.mContext=context;
}
public void showPopupWindow(){
View contentView = LayoutInflater.from(mContext).inflate(R.layout.user_phone_number, null);
phone_number = (EditText) contentView.findViewById(R.id.phone_number); //填入手机号
input_image_code=(EditText)contentView.findViewById(R.id.input_image_code);//填入图片验证码
image_code=(ImageView)contentView.findViewById(R.id.image_code); //图片验证码
input_code=(EditText) contentView.findViewById(R.id.input_code); //填入手机验证码
sure=(Button)contentView.findViewById(R.id.user_verfiy_submit); //确定绑定
no_verify=(Button)contentView.findViewById(R.id.ignore_verfiy_submit); //暂不验证
get_verfiy_code=(Button)contentView.findViewById(R.id.get_verfiy_code);//获取手机验证码
final CountDownTimer timer = new CountDownTimer(60000, 1000) {
@Override
public void onTick(long millisUntilFinished) {
get_verfiy_code.setText(millisUntilFinished/1000 + “秒”);
}
@Override
public void onFinish() {
get_verfiy_code.setEnabled(true);
get_verfiy_code.setText(“获取验证码”);
}
};
image_code.setImageBitmap(Code.getInstance().createBitmap()); //初始化验证码
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.image_code:
image_code.setImageBitmap(Code.getInstance().createBitmap());
break;
case R.id.user_verfiy_submit:
if (TextUtils.isEmpty(phone_number.getText().toString())){
Toast.makeText(mContext,“请您输入手机号码”, Toast.LENGTH_SHORT).show();
return;
}
面试复习笔记：
这份资料我从春招开始，就会将各博客、论坛。网站上等优质的Android开发中高级面试题收集起来，然后全网寻找最优的解答方案。每一道面试题都是百分百的大厂面经真题+最优解答。包知识脉络 + 诸多细节。
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《507页Android开发相关源码解析》
只要是程序员，不管是Java还是Android，如果不去阅读源码，只看API文档，那就只是停留于皮毛，这对我们知识体系的建立和完备以及实战技术的提升都是不利的。
分享给身边好友一起学习。
给文章留个小赞，就可以免费领取啦~
戳我领取：GitHub
《960页Android开发笔记》
[外链图片转存中…(img-JG7c9JCI-1644912794960)]
《1307页Android开发面试宝典》
包含了腾讯、百度、小米、阿里、乐视、美团、58、猎豹、360、新浪、搜狐等一线互联网公司面试被问到的题目。熟悉本文中列出的知识点会大大增加通过前两轮技术面试的几率。
[外链图片转存中…(img-q9Nu6mMz-1644912794961)]
《507页Android开发相关源码解析》
只要是程序员，不管是Java还是Android，如果不去阅读源码，只看API文档，那就只是停留于皮毛，这对我们知识体系的建立和完备以及实战技术的提升都是不利的。
真正最能锻炼能力的便是直接去阅读源码，不仅限于阅读各大系统源码，还包括各种优秀的开源库。
