Android滑动拼图验证码控件使用方法详解

简介: 很多软件为了安全防止恶意攻击,会在登录/注册时进行人机验证,常见的人机验证方式有:谷歌点击复选框进行验证,输入验证码验证,短信验证码,语音验证,文字按顺序选择在图片上点击,滑动拼图验证等。

效果图:

代码实现:

1、滑块视图类:SlideImageView.java。实现随机选取拼图位置,对拼图位置进行验证等功能。

public class SlideImageView extends View {

Bitmap bitmap;

Bitmap drawBitmap;

Bitmap verifyBitmap;

boolean reset = true;

// 拼图的位置

int x;

int y;

// 验证的地方

int left, top, right, bottom;

// 移动x坐标

int moveX;

// x坐标最大移动长度

int moveMax;

// 正确的拼图x坐标

int trueX;

public SlideImageView(Context context) {

super(context);

}

public SlideImageView(Context context, AttributeSet attrs) {

super(context, attrs);

}

public SlideImageView(Context context, AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

}

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

if (bitmap == null)

return;

if (reset) {

/*

* 背景图

*/

int width = getWidth();

int height = getHeight();

drawBitmap = Bitmap.createScaledBitmap(bitmap, width, height, false);

/*

* 验证的地方

*/

int length = Math.min(width, height);

length /= 4;//1/4长度

// 随机选取拼图的位置

x = new Random().nextInt(width - length * 2) + length;

y = new Random().nextInt(height - length * 2) + length;

left = x;

top = y;

right = left + length;

bottom = top + length;

//验证的图片

verifyBitmap = Bitmap.createBitmap(drawBitmap, x, y, length, length);

// 验证图片的最大移动距离

moveMax = width - length;

// 正确的验证位置x

trueX = x;

reset = false;

}

Paint paint = new Paint();

// 画背景图

canvas.drawBitmap(drawBitmap, 0, 0, paint);

paint.setColor(Color.parseColor("#66000000"));

canvas.drawRect(left, top, right, bottom, paint);//画上阴影

paint.setColor(Color.parseColor("#ffffffff"));

canvas.drawBitmap(verifyBitmap, moveX, y, paint);//画验证图片

}

public void setImageBitmap(Bitmap bitmap) {

this.bitmap = bitmap;

}

public void setMove(double precent) {

if (precent < 0 || precent > 1)

return;

moveX = (int) (moveMax * precent);

invalidate();

}

public boolean isTrue(double range) {

if (moveX > trueX * (1 - range) && moveX < trueX * (1 + range)) {

return true;

} else {

return false;

}

}

public void setReDraw() {

reset = true;

invalidate();

}

}

2、视图布局文件:activity_main.xml。

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout

xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context="com.slideimage.MainActivity">

<com.slideimage.SlideImageView

android:id="@+id/slide_image_view"

android:layout_width="240dp"

android:layout_height="150dp"

android:layout_marginTop="50dp"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"/>

<View

android:id="@+id/flash_view"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:visibility="invisible"

app:layout_constraintLeft_toLeftOf="@id/slide_image_view"

app:layout_constraintRight_toRightOf="@id/slide_image_view"

app:layout_constraintTop_toTopOf="@id/slide_image_view"

app:layout_constraintBottom_toBottomOf="@id/slide_image_view"

android:background="@mipmap/drag_flash"/>

<SeekBar

android:id="@+id/seekBar1"

android:layout_width="240dp"

android:layout_height="wrap_content"

android:layout_marginTop="220dp"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"/>

<TextView

android:id="@+id/show_result"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="280dp"

android:textSize="20sp"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent"/>

<Button

android:id="@+id/button1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="320dp"

android:text="重新初始化"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"/>

</android.support.constraint.ConstraintLayout>

3、在Activity中使用滑块验证:MainActivity.java。

public class MainActivity extends AppCompatActivity {

private SeekBar seekBar;

private Button button1;

private SlideImageView slideImageView;

private TextView resultText;

private View flashView;

private static final int flashTime = 800;

private long timeStart = 0;

private float timeUsed;

@SuppressLint("ClickableViewAccessibility")

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

seekBar = findViewById(R.id.seekBar1);

button1 = findViewById(R.id.button1);

slideImageView = findViewById(R.id.slide_image_view);

flashView = findViewById(R.id.flash_view);

resultText = findViewById(R.id.show_result);

slideImageView.setImageBitmap(BitmapFactory.decodeResource(getResources(), R.mipmap.slide_bg));

seekBar.setMax(10000);

seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener(){

@Override

public void onProgressChanged(SeekBar seekBar, int progress,

boolean fromUser) {

slideImageView.setMove(progress*0.0001);

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

timeStart = System.currentTimeMillis();

}

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

}

});

seekBar.setOnTouchListener(new View.OnTouchListener(){

@Override

public boolean onTouch(View v, MotionEvent event) {

switch(event.getAction()){

case MotionEvent.ACTION_UP:

timeUsed = (System.currentTimeMillis() - timeStart) / 1000.0f;

boolean isTrue = slideImageView.isTrue(0.1);//允许有10%误差

if(isTrue) {

flashShowAnime();

updateText("验证成功,耗时:" + timeUsed + "秒");

} else {

updateText("验证失败");

}

break;

}

return false;

}

});

button1.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

reInit();

}

});

}

private void updateText(final String s) {

runOnUiThread(new Runnable() {

@Override

public void run() {

resultText.setText(s);

}

});

}

private void reInit() {

slideImageView.setReDraw();

seekBar.setProgress(0);

resultText.setText("");

flashView.setVisibility(View.INVISIBLE);

}

// 成功高亮动画

private void flashShowAnime() {

TranslateAnimation translateAnimation = new TranslateAnimation(

Animation.RELATIVE_TO_SELF, 1f,

Animation.RELATIVE_TO_SELF, -1f,

Animation.RELATIVE_TO_SELF, 0f,

Animation.RELATIVE_TO_SELF, 0f);

translateAnimation.setDuration(flashTime);

//translateAnimation.setInterpolator(new LinearInterpolator());

flashView.setVisibility(View.VISIBLE);

flashView.setAnimation(translateAnimation);

translateAnimation.setAnimationListener(new Animation.AnimationListener() {

@Override

public void onAnimationStart(Animation animation) {

}

@Override

public void onAnimationEnd(Animation animation) {

flashView.setVisibility(View.INVISIBLE);

}

@Override

public void onAnimationRepeat(Animation animation) {

}

});

}

}

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