水印

单行：

package cn.shengwang.component.watermark.single;

import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;

import androidx.annotation.IntRange;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import cn.shengwang.utils.FcrDpExtKt;

/**

 * date : 2024/11/28
 * description : 只在对角线上显示一行水印
 */
public class FcrWatermarkSingleDrawableFrm extends Drawable {
    private Paint mPaint;
    protected String mText;
    int mTextColor;
    float mTextSize;
    float mRotation;

    FcrWatermarkSingleDrawableFrm() {
        mPaint = new Paint();
    }

    @Override
    public void draw(@NonNull Canvas canvas) {
        int width = getBounds().right;
        int height = getBounds().bottom;
        int diagonal = (int) Math.sqrt(width * width + height * height);

        mPaint.setColor(mTextColor);
        mPaint.setTextSize(FcrDpExtKt.getDp(mTextSize));
        mPaint.setAntiAlias(true);
        float textWidth = mPaint.measureText(mText);

        // 清空背景
        canvas.drawColor(0x00000000);

        // 旋转画布到对角线方向
        canvas.rotate(mRotation, width / 2f, height / 2f);

        // 计算绘制起点
        float startX = -diagonal / 2f;
        float startY = height / 2f;

        // 在对角线上绘制多个水印
        //positionX += textWidth * 2  水印间隔
        for (float positionX = startX; positionX < diagonal / 2f; positionX += textWidth + (textWidth / 3)) {
            canvas.drawText(mText, positionX, startY, mPaint);
        }

        canvas.save();
        canvas.restore();

    }

    @Override
    public void setAlpha(@IntRange(from = 0, to = 255) int alpha) {
    }

    @Override
    public void setColorFilter(@Nullable ColorFilter colorFilter) {
    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT;
    }
}



package cn.shengwang.component.watermark.single;

import android.view.ViewGroup;
import android.widget.FrameLayout;

import androidx.fragment.app.Fragment;

/**
 * 
 * date : 2024/11/28
 * description : 单行水印显示Fragment
 */
public class FcrWatermarkSingleFrm {
    private String mText;
    private int mTextColor;
    private float mTextSize;
    private float mRotation;
    private String mTag; //标记
    private static FcrWatermarkSingleFrm sInstance;

    private FcrWatermarkSingleFrm() {
        mText = "";
        mTextColor = 0xAEAEAEAE;
        mTextSize = 18;
        mRotation = -45;
    }

    public static FcrWatermarkSingleFrm getInstance() {
        if (sInstance == null) {
            synchronized (FcrWatermarkSingleFrm.class) {
                sInstance = new FcrWatermarkSingleFrm();
            }
        }
        return sInstance;
    }

    public FcrWatermarkSingleFrm setText(String text) {
        mText = text;
        return sInstance;
    }

    public FcrWatermarkSingleFrm setTextColor(int color) {
        mTextColor = color;
        return sInstance;
    }

    public FcrWatermarkSingleFrm setTextSize(float size) {
        mTextSize = size;
        return sInstance;
    }

    public FcrWatermarkSingleFrm setRotation(float degrees) {
        mRotation = degrees;
        return sInstance;
    }

    public void show(Fragment fragment, String text, String tag) {
        this.mTag = tag;
        FcrWatermarkSingleDrawableFrm drawable = new FcrWatermarkSingleDrawableFrm();
        drawable.mText = text;
        drawable.mTextColor = mTextColor;
        drawable.mTextSize = mTextSize;
        drawable.mRotation = mRotation;

        ViewGroup rootView = (ViewGroup) fragment.getView();
        if (rootView != null) {
            String watermarkTag = tag;
            FrameLayout existingWatermark = rootView.findViewWithTag(watermarkTag);
            if (existingWatermark == null) {
                FrameLayout layout = new FrameLayout(fragment.getContext());
                layout.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
                layout.setBackground(drawable);
                layout.setTag(watermarkTag);
                rootView.addView(layout);
            }
        }
    }

    /**
     * 移除水印
     *
     * @param fragment
     */
    public void remove(Fragment fragment) {
        ViewGroup rootView = (ViewGroup) fragment.getView();
        if (rootView != null) {
            String watermarkTag = mTag;
            FrameLayout existingWatermark = rootView.findViewWithTag(watermarkTag);
            if (existingWatermark != null) {
                rootView.removeView(existingWatermark);
            }
        }
    }
}

多行

package cn.shengwang.component.watermark.multi;

import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;

import androidx.annotation.IntRange;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import cn.shengwang.utils.FcrDpExtKt;

/**

 * date : 2024/11/28
 * description : 多行显示水印Fragment
 */
public class FcrWatermarkDrawableFrm extends Drawable {
    private Paint mPaint;
    protected String mText;
    int mTextColor;
    float mTextSize;
    float mRotation;

    FcrWatermarkDrawableFrm() {
        mPaint = new Paint();
    }

    @Override
    public void draw(@NonNull Canvas canvas) {
        int width = getBounds().right;
        int height = getBounds().bottom;
        int diagonal = (int) Math.sqrt(width * width + height * height);

        mPaint.setColor(mTextColor);
        mPaint.setTextSize(FcrDpExtKt.getDp(mTextSize));
        mPaint.setAntiAlias(true);
        float textWidth = mPaint.measureText(mText);

        canvas.drawColor(0x00000000);
        canvas.rotate(mRotation);

        int index = 0;
        float fromX;
        for (int positionY = diagonal / 10; positionY <= diagonal; positionY += diagonal / 10) {
            fromX = -width + (index++ % 2) * textWidth;
            for (float positionX = fromX; positionX < width; positionX += textWidth * 2) {
                canvas.drawText(mText, positionX, positionY, mPaint);
            }
        }

        canvas.save();
        canvas.restore();
    }

    @Override
    public void setAlpha(@IntRange(from = 0, to = 255) int alpha) {
    }

    @Override
    public void setColorFilter(@Nullable ColorFilter colorFilter) {
    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT;
    }
}



package cn.shengwang.component.watermark.multi;

import android.view.ViewGroup;
import android.widget.FrameLayout;

import androidx.fragment.app.Fragment;

/**
 * date : 2024/11/28
 * description : 多行显示水印Fragment
 */
public class FcrWatermarkFrm {
    private String mText;
    private int mTextColor;
    private float mTextSize;
    private float mRotation;
    private String mTag; //标记
    private static FcrWatermarkFrm sInstance;

    private FcrWatermarkFrm() {
        mText = "";
        mTextColor = 0xAEAEAEAE;
        mTextSize = 18;
        mRotation = -25;
    }

    public static FcrWatermarkFrm getInstance() {
        if (sInstance == null) {
            synchronized (FcrWatermarkFrm.class) {
                sInstance = new FcrWatermarkFrm();
            }
        }
        return sInstance;
    }

    public FcrWatermarkFrm setText(String text) {
        mText = text;
        return sInstance;
    }

    public FcrWatermarkFrm setTextColor(int color) {
        mTextColor = color;
        return sInstance;
    }

    public FcrWatermarkFrm setTextSize(float size) {
        mTextSize = size;
        return sInstance;
    }

    public FcrWatermarkFrm setRotation(float degrees) {
        mRotation = degrees;
        return sInstance;
    }

    public void show(Fragment fragment, String text, String tag) {
        this.mTag = tag;
        FcrWatermarkDrawableFrm drawable = new FcrWatermarkDrawableFrm();
        drawable.mText = text;
        drawable.mTextColor = mTextColor;
        drawable.mTextSize = mTextSize;
        drawable.mRotation = mRotation;

        ViewGroup rootView = (ViewGroup) fragment.getView();
        if (rootView != null) {
            String watermarkTag = tag;
            FrameLayout existingWatermark = rootView.findViewWithTag(watermarkTag);
            if (existingWatermark == null) {
                FrameLayout layout = new FrameLayout(fragment.getContext());
                layout.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
                layout.setBackground(drawable);
                layout.setTag(watermarkTag);
                rootView.addView(layout);
            }
        }
    }

    /**
     * 移除水印
     *
     * @param fragment
     */
    public void remove(Fragment fragment) {
        ViewGroup rootView = (ViewGroup) fragment.getView();
        if (rootView != null) {
            String watermarkTag = mTag;
            FrameLayout existingWatermark = rootView.findViewWithTag(watermarkTag);
            if (existingWatermark != null) {
                rootView.removeView(existingWatermark);
            }
        }
    }
}

activity中用：

package cn.shengwang.component.watermark.multi;

import android.app.Activity;
import android.view.ViewGroup;
import android.widget.FrameLayout;

/**
 * date : 2024/11/28
 * description :多行显示水印Activity (保留暂不删除目前需求只使用到了Fragment）
 */
public class FcrWatermarkAct {
    /**
     * 水印文本
     */
    private String mText;
    /**
     * 字体颜色，十六进制形式，例如：0xAEAEAEAE
     */
    private int mTextColor;
    /**
     * 字体大小，单位为sp
     */
    private float mTextSize;
    /**
     * 旋转角度
     */
    private float mRotation;
    private static FcrWatermarkAct sInstance;

    private FcrWatermarkAct() {
        mText = "";
        mTextColor = 0xAEAEAEAE;
        mTextSize = 18;
        mRotation = -25;
    }

    public static FcrWatermarkAct getInstance() {
        if (sInstance == null) {
            synchronized (FcrWatermarkAct.class) {
                sInstance = new FcrWatermarkAct();
            }
        }
        return sInstance;
    }

    /**
     * 设置水印文本
     *
     * @param text 文本
     * @return Watermark实例
     */
    public FcrWatermarkAct setText(String text) {
        mText = text;
        return sInstance;
    }

    /**
     * 设置字体颜色
     *
     * @param color 颜色，十六进制形式，例如：0xAEAEAEAE
     * @return Watermark实例
     */
    public FcrWatermarkAct setTextColor(int color) {
        mTextColor = color;
        return sInstance;
    }

    /**
     * 设置字体大小
     *
     * @param size 大小，单位为sp
     * @return Watermark实例
     */
    public FcrWatermarkAct setTextSize(float size) {
        mTextSize = size;
        return sInstance;
    }

    /**
     * 设置旋转角度
     *
     * @param degrees 度数
     * @return Watermark实例
     */
    public FcrWatermarkAct setRotation(float degrees) {
        mRotation = degrees;
        return sInstance;
    }

    /**
     * 显示水印，铺满整个页面
     *
     * @param activity 活动
     */
    public void show(Activity activity) {
        show(activity, mText);
    }

    /**
     * 显示水印，铺满整个页面
     *
     * @param activity 活动
     * @param text     水印
     */
    public void show(Activity activity, String text) {
        FcrWatermarkDrawableAct drawable = new FcrWatermarkDrawableAct();
        drawable.mText = text;
        drawable.mTextColor = mTextColor;
        drawable.mTextSize = mTextSize;
        drawable.mRotation = mRotation;

        ViewGroup rootView = activity.findViewById(android.R.id.content);
        FrameLayout layout = new FrameLayout(activity);
        layout.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
        layout.setBackground(drawable);
        rootView.addView(layout);

    }
}


package cn.shengwang.component.watermark.multi;

import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;

import androidx.annotation.IntRange;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import cn.shengwang.utils.FcrDpExtKt;

/**
 * date : 2024/11/28
 * description : 多行显示水印Activity（保留暂不删除目前需求只使用到了Fragment）
 */
public class FcrWatermarkDrawableAct extends Drawable {
    private Paint mPaint;
    /**
     * 水印文本
     */
    protected String mText;
    /**
     * 字体颜色，十六进制形式，例如：0xAEAEAEAE
     */
    int mTextColor;
    /**
     * 字体大小，单位为sp
     */
    float mTextSize;
    /**
     * 旋转角度
     */
    float mRotation;

    FcrWatermarkDrawableAct() {
        mPaint = new Paint();
    }

    @Override
    public void draw(@NonNull Canvas canvas) {
        int width = getBounds().right;
        int height = getBounds().bottom;
        int diagonal = (int) Math.sqrt(width * width + height * height); // 对角线的长度

        mPaint.setColor(mTextColor);
        mPaint.setTextSize(FcrDpExtKt.getDp(mTextSize));
        mPaint.setAntiAlias(true);
        float textWidth = mPaint.measureText(mText);

        canvas.drawColor(0x00000000);
        canvas.rotate(mRotation);

        int index = 0;
        float fromX;
        // 以对角线的长度来做高度，这样可以保证竖屏和横屏整个屏幕都能布满水印
        for (int positionY = diagonal / 10; positionY <= diagonal; positionY += diagonal / 10) {
            fromX = -width + (index++ % 2) * textWidth; // 上下两行的X轴起始点不一样，错开显示
            for (float positionX = fromX; positionX < width; positionX += textWidth * 2) {
                canvas.drawText(mText, positionX, positionY, mPaint);
            }
        }

        canvas.save();
        canvas.restore();
    }

    @Override
    public void setAlpha(@IntRange(from = 0, to = 255) int alpha) {
    }

    @Override
    public void setColorFilter(@Nullable ColorFilter colorFilter) {
    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT;
    }


}

工具类：

package cn.shengwang.component.watermark

import android.view.ViewGroup
import android.widget.FrameLayout
import androidx.fragment.app.Fragment
import cn.shengwang.component.watermark.multi.FcrWatermarkFrm
import cn.shengwang.component.watermark.single.FcrWatermarkSingleFrm

/**
 * date : 2024/11/28
 * description : 统一管理单行和多行水印的显示
 */
object WaterMarkUtils {
    const val SINGLE_TYPE = "single_type"
    const val MULTI_TYPE = "multi_type"

    /**
     * @param fragment 容器fragment
     * @param content  水印内容
     * @param type 是单行还是多行
     * @param tag  借助tab 防止多次添加水印以及删除操作 (这个参数不用传默认值就ok 和 remove方法对齐)
     */
    fun show(fragment: Fragment, content: String, type: String, tag: String = "mark") {
        when (type) {
            SINGLE_TYPE -> {
                FcrWatermarkSingleFrm.getInstance().show(fragment, content, tag)
            }

            MULTI_TYPE -> {
                FcrWatermarkFrm.getInstance().show(fragment, content, tag)
            }
        }
    }

    /**
     * 移除水印不区分是单行还是多行
     * @param tag 直接使用默认值就ok
     */
    fun remove(fragment: Fragment, tag: String = "mark") {
        val rootView = fragment.view as ViewGroup?
        if (rootView != null) {
            val watermarkTag: String = tag
            val existingWatermark = rootView.findViewWithTag<FrameLayout>(watermarkTag)
            if (existingWatermark != null) {
                rootView.removeView(existingWatermark)
            }
        }
    }

}
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