ht_gate/app/src/main/java/com/ht/gate/UnlockView.java

package com.ht.gate;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.DrawFilter;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.Typeface;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.util.TypedValue;
import android.view.MotionEvent;
import android.view.View;

import androidx.annotation.Nullable;
import androidx.core.content.res.ResourcesCompat;

public class UnlockView extends View {

    private Paint borderPaint;
    private Paint linePaint;
    private Paint textPaint;
    private Shader lineShader;
    private Path borderPath;
    private float borderWidth;
    private Bitmap bmUnlock;
    private Bitmap bmUnlocked;
    private float distance = 0;
    private float padding = 0;
    private boolean down;
    private float lastX;
    private Rect src, src1;
    private RectF dst, dst1;
    private DrawFilter drawFilter;
    private Typeface source_han_sans_sc_normal;
    private Typeface source_han_sans_sc_light;
    private int colorLight = 0xFFFFFFFF;
    private int colorDark = 0xFF222639;
    private int colorUnlockedLight = 0x11C1C3CD;
    private int colorUnlockedDark = 0x1E222639;
    private boolean dark;
    private boolean preUnlock = false;

    private String hint;

    private UnlockListener unlockListener;
    private boolean unlocked;

    public interface UnlockListener {
        void onUnlock();
    }

    public void setUnlockListener(UnlockListener unlockListener) {
        this.unlockListener = unlockListener;
    }

    public UnlockView(Context context) {
        this(context, null);
    }

    public UnlockView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public UnlockView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        this(context, attrs, defStyleAttr, 0);
    }

    public UnlockView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);

        TypedArray t = getContext().obtainStyledAttributes(attrs,
                R.styleable.UnlockView);
        hint = t.getString(R.styleable.UnlockView_hint);
        if (TextUtils.isEmpty(hint)) {
            hint = "滑动解锁";
        }
        dark = t.getBoolean(R.styleable.UnlockView_darkMode, false);
        t.recycle();

        source_han_sans_sc_normal = ResourcesCompat.getFont(getContext(), R.font.source_han_sans_sc_normal);
        source_han_sans_sc_light = ResourcesCompat.getFont(getContext(), R.font.source_han_sans_sc_light);
        borderPaint = new Paint();
        borderPaint.setAntiAlias(true);
        borderWidth = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 1, getContext().getResources().getDisplayMetrics());
        borderPaint.setStrokeWidth(borderWidth);
        borderPaint.setStyle(Paint.Style.STROKE);
        borderPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
        borderPath = new Path();
        padding = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 7, getContext().getResources().getDisplayMetrics());
        bmUnlock = BitmapFactory.decodeResource(getResources(), dark ? R.mipmap.icon_unlock_dark : R.mipmap.icon_unlock);
        bmUnlocked = BitmapFactory.decodeResource(getResources(), dark ? R.mipmap.icon_unlocked_dark : R.mipmap.icon_unlocked);
        src = new Rect(0, 0, bmUnlock.getWidth(), bmUnlock.getHeight());
        dst = new RectF();
        src1 = new Rect(0, 0, bmUnlocked.getWidth(), bmUnlocked.getHeight());
        dst1 = new RectF();

        drawFilter = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);

        linePaint = new Paint();
        linePaint.setAntiAlias(true);
        linePaint.setStrokeCap(Paint.Cap.ROUND);

        textPaint = new Paint();
        textPaint.setAntiAlias(true);
        textPaint.setTextSize(sp2px(25));
        textPaint.setStyle(Paint.Style.FILL);
        textPaint.setTypeface(source_han_sans_sc_light);
    }

    public void setUnlocked(boolean unlocked) {
        this.unlocked = unlocked;
        postInvalidate();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @SuppressLint("DrawAllocation")
    @Override
    protected void onDraw(Canvas canvas) {
        canvas.setDrawFilter(drawFilter);
        float width = getWidth();
        float height = getHeight();
        float d = (height - borderWidth);
        float r = d / 2;

        if (unlocked) {
            borderPaint.setColor(dark ? colorUnlockedDark : colorUnlockedLight);
            borderPaint.setStyle(Paint.Style.FILL);
            textPaint.setColor(dark ? colorDark : colorLight);
            canvas.drawRoundRect(0, 0, width, height, height / 2, height / 2, borderPaint);
            float textWidth = textPaint.measureText("已解锁");
            float baseLineY = Math.abs(textPaint.ascent() + textPaint.descent()) / 2 + getHeight() / 2f;
            canvas.drawText("已解锁", (getWidth() + dp2px(32)) / 2f - textWidth / 2, baseLineY, textPaint);

            dst1.left = (width - textPaint.measureText("已解锁") - dp2px(32)) / 2;
            dst1.top = (height - dp2px(26)) / 2;
            dst1.right = dst1.left + dp2px(21);
            dst1.bottom = dst1.top + dp2px(26);
            canvas.drawBitmap(bmUnlocked, src1, dst1, null);
            return;
        } else {
            borderPaint.setStyle(Paint.Style.STROKE);
            if (dark) {
                borderPaint.setColor(colorDark);
                textPaint.setColor(colorDark);
            } else {
                borderPaint.setColor(colorLight);
                textPaint.setColor(colorLight);
            }
        }

        borderPath.reset();
        borderPath.moveTo(r + borderWidth / 2, borderWidth / 2);
        borderPath.lineTo(r + borderWidth / 2, borderWidth / 2);
        borderPath.lineTo(width - r, borderWidth / 2);
        borderPath.arcTo(width - d - borderWidth / 2, borderWidth / 2, width - borderWidth / 2, height - borderWidth / 2, -90, 180, true);
        borderPath.lineTo(r + borderWidth / 2, height - borderWidth / 2);
        borderPath.arcTo(borderWidth / 2, borderWidth / 2, d + borderWidth / 2, height - borderWidth / 2, 90, 180, true);
        canvas.drawPath(borderPath, borderPaint);

        float size = height - padding * 2;
        int dd = (int) Math.max(0, Math.min(distance, getWidth() - padding * 2 - size));

        linePaint.setStrokeWidth(height - padding * 2);
        lineShader = dark ? new LinearGradient(0, 0, width, 0,
                new int[]{0x00222639,
                        0x1F222639,
                        0x78222639,
                        0xD4222639},
                new float[]{0, 0.19f, 0.42f, 1}, Shader.TileMode.CLAMP)
                : new LinearGradient(0, 0, width, 0,
                new int[]{Color.argb(0, 255, 255, 255),
                        Color.argb(30, 255, 255, 255),
                        Color.argb(117, 255, 255, 255),
                        Color.argb(255, 255, 255, 255)},
                new float[]{0, 0.19f, 0.42f, 1}, Shader.TileMode.CLAMP);
        linePaint.setShader(lineShader);
        canvas.drawLine(r, height / 2, r + dd, height / 2, linePaint);

        drawCenterText(canvas, textPaint, hint);

        dst.left = (int) padding + dd;
        dst.top = (int) padding;
        dst.right = (int) (padding + size + dd);
        dst.bottom = (int) (padding + size);
        canvas.drawBitmap(bmUnlock, src, dst, null);

    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                if (event.getX() < getHeight() && event.getY() < getHeight()) {
                    down = true;
                    lastX = event.getX();
                }
                break;
            case MotionEvent.ACTION_UP:
                distance = 0;
                down = false;
                preUnlock = false;
                postInvalidate();
                break;
            case MotionEvent.ACTION_MOVE:
                if (down) {
                    distance += event.getX() - lastX;
                    lastX = event.getX();
                    if (distance >= getWidth() - padding * 2 - (getHeight() - padding * 2) && !preUnlock) {
                        preUnlock = true;
                        if (unlockListener != null) {
                            unlockListener.onUnlock();
                        }
                    }
                    postInvalidate();
                }
                break;
        }
        return true;
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        if (bmUnlock != null && !bmUnlock.isRecycled()) {
            bmUnlock.recycle();
            bmUnlock = null;
        }
    }

    private void drawCenterText(Canvas canvas, Paint paint, String text) {
        // 文本宽
        float textWidth = paint.measureText(text);
        // 文本baseline在y轴方向的位置
        float baseLineY = Math.abs(paint.ascent() + paint.descent()) / 2 + getHeight() / 2f;
        canvas.drawText(text, getWidth() / 2f - textWidth / 2, baseLineY, paint);
    }

    public int sp2px(float sp) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, sp,
                getContext().getResources().getDisplayMetrics());
    }

    public int dp2px(float dp) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp,
                getContext().getResources().getDisplayMetrics());
    }
}