前言：
网上也有非常多基于二维码zxing实现自定义需求，但是搜索了一大圈，都没找到自己想要的那种效果，本文基于综合各大大神资料，自己绘制了一个实现zxing二维码，仿微信实现了双击放大缩小，二维码边角，及去除ZXing Android Embedded原生红线效果，仿微信绘制了线条滚动效果。
eg
导入aar
implementation (‘com.journeyapps:zxing-android-embedded:3.6.0’){ transitive = false }
implementation ‘com.google.zxing:core:3.3.2’
implementation ‘com.tbruyelle.rxpermissions2:rxpermissions:0.9.4@aar’
代码
1.闪光灯
//获取CompoundBarcodeView类
private CompoundBarcodeView barcodeView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.qrcode);
.....
barcodeView = (CompoundBarcodeView) findViewById(R.id.barcode_scanner);
....
flashlight.setOnClickListener(v -> {
if (isLightOn) {
//闪光灯关闭
barcodeView.setTorchOff();
flashlight.setImageResource(R.drawable.light_close);
} else {
//闪光灯打开
barcodeView.setTorchOn();
flashlight.setImageResource(R.drawable.light_open);
}
isLightOn = !isLightOn;
});
// 如果没有闪光灯功能，就去掉相关按钮
if (!hasFlash()) {
flashlight.setVisibility(View.GONE);
}
}
这里主要调用zxing已经给我们写好的接口CompoundBarcodeView下的接口barcodeView.setTorchOn和Off，我们直接引用就可以了。
2.四个边角框
我们看ZXing Android Embedded源码可以知道，我们可以重写DecoratedBarcodeView类的R.layout.zxing_barcode_scanner的布局
/**
* Initialize the view with the xml configuration based on styleable attributes.
*
* @param attrs The attributes to use on view.
*/
private void initialize(AttributeSet attrs) {
// Get attributes set on view
TypedArray attributes = getContext().obtainStyledAttributes(attrs, R.styleable.zxing_view);
int scannerLayout = attributes.getResourceId(
R.styleable.zxing_view_zxing_scanner_layout, R.layout.zxing_barcode_scanner);
attributes.recycle();
inflate(getContext(), scannerLayout, this);
barcodeView = (BarcodeView) findViewById(R.id.zxing_barcode_surface);
if (barcodeView == null) {
throw new IllegalArgumentException(
"There is no a com.journeyapps.barcodescanner.BarcodeView on provided layout " +
"with the id \"zxing_barcode_surface\
点开之类，我写上备注
<merge xmlns:android="http://schemas.android.com/apk/res/ android">
//ScaleBarcodeView 这个对应修改整个背景不分（例如放大缩小）
<com.example.qrcodeactivity.qrcode.ScaleBarcodeView
android:id="@+id/zxing_barcode_surface"
android:layout_width="match_parent"
android:layout_height="match_parent" />
//CustomViewFinderView 这个对应修改扫描框（例如边角，红线部分）
<com.example.qrcodeactivity.qrcode.CustomViewFinderView
android:id="@+id/zxing_viewfinder_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
//底部自定义文字
<TextView
android:id="@+id/zxing_status_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center_horizontal"
android:background="@color/zxing_transparent"
android:text="@string/zxing_msg_default_status"
android:textColor="@color/zxing_status_text" />
</merge>
这里我们要实现去红线和四个角，所以我们要继承ViewfinderView重写ondraw部分代码
/**
* desc:重写扫描框类
* author：ccw
* date:2019-12-27
* time:22:45
*/
public class CustomViewFinderView extends ViewfinderView {
private int screenWidth = 0;
private int screenHeight = 0;
private RectF buttonRect;
private String text_btn = "个性化需求";
/**
* 重绘时间间隔
*/
private static long CUSTOME_ANIMATION_DELAY = 16;
/**
* 边角线颜色
*/
private int mLineColor = getContext().getResources().getColor(R.color.c_a_green);
/**
* 线性梯度各个位置对应的颜色值
*/
private Rect nowScanRect;
/**
* 边角线厚度 (建议使用dp)
*/
private float mLineDepth = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 2f, getResources().getDisplayMetrics());
/**
* "边角线长度/扫描边框长度"的占比 (比例越大，线越长)
*/
private float mLineRate = 0.05f;
/**
* 扫描线起始位置
*/
private int mScanLinePosition = 0;
/**
* 扫描线每次重绘的移动距离
*/
private float mScanLineDy = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 3f, getResources().getDisplayMetrics());
/**
* 线性梯度
*/
private LinearGradient mLinearGradient;
/**
* 线性梯度位置
*/
private float[] mPositions = {0f, 0.5f, 1f};
/**
* 扫描线厚度
*/
private float mScanLineDepth = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 1f, getResources().getDisplayMetrics());
//扫描线渐变色
private int laserColor_center = getContext().getResources().getColor(R.color.c_a_green);
private int laserColor_light = getContext().getResources().getColor(R.color.c_a_green);
private int[] mScanLineColor = {laserColor_light, laserColor_center, laserColor_light};
private float mDist = 0;
public CustomViewFinderView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
WindowManager windowManager = ((Activity) getContext()).getWindowManager();
DisplayMetrics displayMetrics = new DisplayMetrics();
windowManager.getDefaultDisplay().getMetrics(displayMetrics);
screenWidth = displayMetrics.widthPixels;
screenHeight = displayMetrics.heightPixels;
int w = screenWidth * 3 / 5;
int marginL = screenWidth / 5;
int marginT = screenHeight / 4;
nowScanRect = new Rect(marginL, marginT, w + marginL, w + marginT);
}
@SuppressLint("DrawAllocation")
@Override
public void onDraw(Canvas canvas) {
refreshSizes();
if (framingRect == null || previewFramingRect == null) {
return;
}
Rect frame = nowScanRect;
// Rect frame = cameraPreview.getFramingRect();
Rect previewFrame = previewFramingRect;
int width = canvas.getWidth();
int height = canvas.getHeight();
if (resultBitmap != null) {
paint.setColor(resultColor);
} else {
paint.setColor(maskColor);
}
canvas.drawRect(0f, 0f, width, frame.top, paint);
canvas.drawRect(0f, frame.top, frame.left, (frame.bottom + 1), paint);
canvas.drawRect((frame.right + 1), frame.top, width, (frame.bottom + 1), paint);
canvas.drawRect(0f, (frame.bottom + 1), width, height, paint);
// drawText(canvas, frame)
// drawButton(canvas, frame);
////绘制4个角
paint.setColor(mLineColor);
//
// 定义画笔的颜色
//左上-横线
canvas.drawRect(frame.left - mLineDepth,
frame.top - mLineDepth,
frame.left + frame.width() * mLineRate,
frame.top, paint);
//左上-纵线
canvas.drawRect(frame.left - mLineDepth, frame.top, frame.left, frame.top + frame.height() * mLineRate, paint);
//右上-横线
canvas.drawRect(frame.right - frame.width() * mLineRate, frame.top - mLineDepth, frame.right + mLineDepth, frame.top, paint);
//右上-纵线
canvas.drawRect(frame.right, frame.top - mLineDepth, frame.right + mLineDepth, frame.top + frame.height() * mLineRate, paint);
//左下-横线
canvas.drawRect(frame.left - mLineDepth, frame.bottom, frame.left + frame.width() * mLineRate, frame.bottom + mLineDepth, paint);
//左下-纵线
canvas.drawRect(frame.left - mLineDepth, frame.bottom - frame.height() * mLineRate, frame.left, frame.bottom, paint);
//右下-横线
canvas.drawRect(frame.right - frame.width() * mLineRate, frame.bottom, frame.right + mLineDepth, frame.bottom + mLineDepth, paint);
//右下-纵线
canvas.drawRect(frame.right, frame.bottom - frame.height() * mLineRate, frame.right + mLineDepth, frame.bottom + mLineDepth, paint);
if (resultBitmap != null) {
paint.setAlpha(ViewfinderView.CURRENT_POINT_OPACITY);
canvas.drawBitmap(resultBitmap, null, frame, paint);
} else {
// drawLaserLine(canvas,frame)
// 绘制扫描线
mScanLinePosition += mScanLineDy;
if (mScanLinePosition > frame.height()) {
mScanLinePosition = 0;
}
mLinearGradient = new LinearGradient(frame.left, (frame.top + mScanLinePosition), frame.right, (frame.top + mScanLinePosition), mScanLineColor, mPositions, Shader.TileMode.CLAMP);
paint.setShader(mLinearGradient);
canvas.drawRect(frame.left, (frame.top + mScanLinePosition), frame.right, frame.top + mScanLinePosition + mScanLineDepth, paint);
paint.setShader(null);
int scaleX = frame.width() / previewFrame.width();
int scaleY = frame.height() / previewFrame.height();
List<ResultPoint> currentPossible = possibleResultPoints;
List<ResultPoint> currentLast = lastPossibleResultPoints;
int frameLeft = frame.left;
int frameTop = frame.top;
if (currentPossible.isEmpty()) {
lastPossibleResultPoints=null;
} else {
possibleResultPoints = new ArrayList(5);
lastPossibleResultPoints = currentPossible;
paint.setAlpha(ViewfinderView.CURRENT_POINT_OPACITY);
paint.setColor(resultPointColor);
for (ResultPoint point : currentPossible) {
canvas.drawCircle((frameLeft + (point.getX() * scaleX)), (frameTop + (point.getY() * scaleY)), ViewfinderView.POINT_SIZE, paint);
}
}
if (currentLast != null) {
paint.setAlpha(ViewfinderView.CURRENT_POINT_OPACITY / 2);
paint.setColor(resultPointColor);
float radius = ViewfinderView.POINT_SIZE / 2.0f;
for (ResultPoint point : currentLast) {
canvas.drawCircle((frameLeft + (point.getX() * scaleX)), (frameTop + (point.getY() * scaleY)), radius, paint);
}
}
}// Request another update at the animation interval, but only repaint the laser line, // not the entire viewfinde
// rmask.
postInvalidateDelayed(CUSTOME_ANIMATION_DELAY, frame.left, frame.top, frame.right, frame.bottom);
}
private void drawButton(Canvas canvas, Rect mScanRect) {
Paint buttonPaint = new Paint();
buttonPaint.setAntiAlias(true);
buttonPaint.setColor(getContext().getResources().getColor(R.color.c_white));
buttonPaint.setStrokeWidth(1f);
buttonPaint.setStyle(Paint.Style.STROKE);
int height = CommonUtils.dp2px(getContext(), 40);
int left = mScanRect.left + (mScanRect.right - mScanRect.left) / 6;
int top = mScanRect.bottom + CommonUtils.dp2px(getContext(), 48);
int right = mScanRect.right - (mScanRect.right - mScanRect.left) / 6;
int bottom = mScanRect.bottom + CommonUtils.dp2px(getContext(), 48) + height;
buttonRect = new RectF(left, top, right, bottom);
canvas.drawRoundRect(buttonRect, CommonUtils.dp2px(getContext(), 20), CommonUtils.dp2px(getContext(), 20), buttonPaint);
buttonPaint.setColor(getContext().getResources().getColor(R.color.c_white));
buttonPaint.setTextSize(CommonUtils.dp2px(getContext(), 14));
buttonPaint.setStyle(Paint.Style.FILL);
buttonPaint.setTextAlign(Paint.Align.CENTER);
Paint.FontMetricsInt fontMetrics = buttonPaint.getFontMetricsInt();
// var baseLine = buttonRect.centerY() + (fontMetrics.descent - fontMetrics.ascent) / 2 - fontMetrics.descent
int baseLine = (int) ((buttonRect.top + buttonRect.bottom - fontMetrics.top - fontMetrics.bottom) / 2);
canvas.drawText(text_btn, buttonRect.centerX(), baseLine, buttonPaint);
}
3.0双击放大缩小和双指放大缩小功能
这里我们要实现双击放大缩小和双指放大缩小功能，所以我们要继承BarcodeView重写
public class ScaleBarcodeView extends BarcodeView {
private float mDist = 0;
//扩展增加双击放大缩小操作 ccw
private static int timeout = 300;//双击间三百毫秒延时
private int clickCount = 0;//记录连续点击次数
private Handler handler;
public ScaleBarcodeView(Context context) {
super(context);
}
public ScaleBarcodeView(Context context, AttributeSet attrs) {
super(context, attrs);
handler = new Handler();
}
public ScaleBarcodeView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@SuppressLint("ClickableViewAccessibility")
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
if (event.getPointerCount() > 1) {
// handle multi-touch events
if (action == MotionEvent.ACTION_POINTER_DOWN) {
mDist = getFingerSpacing(event);
} else if (action == MotionEvent.ACTION_MOVE) {
CameraInstance cameraInstance = getCameraInstance();
if (cameraInstance != null) {
cameraInstance.changeCameraParameters(parameters -> {
handleZoom(event, parameters);
return parameters;
});
}
}
} else if (event.getPointerCount() == 1) {
if (action == MotionEvent.ACTION_DOWN) {
clickCount++;
handler.postDelayed(new Runnable() {
@Override
public void run() {
if (clickCount == 2) {
CameraInstance cameraInstance = getCameraInstance();
if (cameraInstance != null) {
cameraInstance.changeCameraParameters(parameters -> {
handleScaleZoom(parameters);
return parameters;
});
}
}
handler.removeCallbacksAndMessages(null);
//清空handler延时，并防内存泄漏
clickCount = 0;//计数清零
}
}, timeout);
}
}
return true;
}
private void handleZoom(MotionEvent event, Camera.Parameters params) {
int maxZoom = params.getMaxZoom();
int zoom = params.getZoom();
float newDist = getFingerSpacing(event);
if (newDist > mDist) {
//zoom in
if (zoom < maxZoom)
zoom++;
} else if (newDist < mDist) {
//zoom out
if (zoom > 0)
zoom--;
}
mDist = newDist;
params.setZoom(zoom);
}
private void handleScaleZoom(Camera.Parameters params) {
int maxZoom = params.getMaxZoom();
int zoom = params.getZoom();
if (zoom < maxZoom / 2) {
params.setZoom(maxZoom);
} else {
params.setZoom(1);
}
}
/**
* Determine the space between the first two fingers
*/
private float getFingerSpacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return (float) Math.sqrt(x * x + y * y);
}
}
这样就行了，下面我会放上demo，需要的兄弟直接github下载下来研究下，有用到的兄弟姐妹点点关注
点关注不迷路,打个小赏把~~
Github地址: https://github.com/ccwccw123/android-qrcode/tree/master
