Android 实现水印背景效果，kotlin 教程
setTextBold(textBold);
}
}
/**
设置水印 X 轴偏移量（单位：px）
@param dx X 轴偏移量(默认:100px)
*/
public void setDx(int dx) {
this.mDx = dx;
postInvalidate();
}
/**
同步设置水印 X 轴偏移量（单位：px）
@param dx X 轴偏移量(默认:100px)
*/
void setSyncDx(int dx) {
if (mSync) {
setDx(dx);
}
}
/**
设置水印 Y 轴偏移量（单位：px）
@param dy Y 轴偏移量(默认:240px)
*/
public void setDy(int dy) {
this.mDy = dy;
postInvalidate();
}
/**
同步设置水印 Y 轴偏移量（单位：px）
@param dy Y 轴偏移量(默认:240px)
*/
void setSignDy(int dy) {
if (mSync) {
setDy(dy);
}
}
/**
设置水印对齐方式
@param align 对齐方式(默认:Center)
*/
public void setAlign(Paint.Align align) {
this.mAlign = align;
postInvalidate();
}
/**
同步设置水印对齐方式
@param align 对齐方式(默认:Center)
*/
void setSignAlign(Paint.Align align) {
if (mSync) {
setAlign(align);
}
}
/**
销毁相关页面时调用（切记）
*/
public void onDestroy() {
if (mSync) {
WaterMarkManager.LIST.remove(this);
}
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
return false;
}
@SuppressLint("ClickableViewAccessibility")
@Override
public boolean onTouchEvent(MotionEvent event) {
return false;
}
}
<declare-styleable name="WaterMarkView">
<attr name="water_mark_degree" format="integer|reference" />
<attr name="water_mark_text" format="string|reference" />
<attr name="water_mark_textColor" format="color|reference" />
<attr name="water_mark_textSize" format="dimension|reference" />
<attr name="water_mark_textBold" format="boolean" />
<attr name="water_mark_dx" format="dimension|reference" />
<attr name="water_mark_dy" format="dimension|reference" />
<attr name="water_mark_align" format="dimension">
<enum name="LEFT" value="0" />
<enum name="CENTER" value="1" />
<enum name="RIGHT" value="2" />
</attr>
<attr name="water_mark_sync" format="boolean" />
</declare-styleable>
package com.hkdc.commonlib.warkmark;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.graphics.Paint;
import android.view.LayoutInflater;
import com.hkdc.commonlib.R;
import java.util.ArrayList;
import java.util.List;
/**
@author Leon (wshk729@163.com)
@date 2018/8/24
<p>
*/
public class WaterMarkManager {
static WaterMarkInfo INFO = null;
static String[] CONTENT = null;
static List<WaterMarkView> LIST = new ArrayList<>();
/**
设置水印全局配置信息
@param info 配置信息
*/
public static void setInfo(WaterMarkInfo info) {
INFO = info;
}
/**
获取一个满屏水印 View
@param activity activity
*/
@SuppressLint("InflateParams")
public static WaterMarkView getView(Activity activity) {
return (WaterMarkView) LayoutInflater.from(activity).inflate(R.layout.view_water_mark, null);
}
/**
WaterMarkInfo 初始化判断
*/
private static void assertInitialized() {
if (INFO == null) {
INFO = WaterMarkInfo.create().generate();
}
}
/**
同步设置全部水印文字信息
@param content 文字信息
*/
public static void setText(String... content) {
assertInitialized();
CONTENT = content;
if (LIST.size() > 0) {
for (WaterMarkView view : LIST) {
if (view != null) {
view.setSyncText(content);
}
}
}
}
/**
同步设置全部水印倾斜角度
@param degrees 倾斜角度(默认:-30)
*/
public static void setDegrees(int degrees) {
assertInitialized();
INFO.setDegrees(degrees);
if (LIST.size() > 0) {
for (WaterMarkView view : LIST) {
if (view != null) {
view.setSyncDegrees(degrees);
}
}
}
}
/**
同步设置全部水印字体颜色
@param textColor 字体颜色(默认:#33000000)
*/
public static void setTextColor(int textColor) {
assertInitialized();
INFO.setTextColor(textColor);
if (LIST.size() > 0) {
for (WaterMarkView view : LIST) {
if (view != null) {
view.setSyncTextColor(textColor);
}
}
}
}
/**
同步设置全部水印字体大小（单位：px）
@param textSize 字体大小(默认:42px)
*/
public static void setTextSize(int textSize) {
assertInitialized();
INFO.setTextSize(textSize);
if (LIST.size() > 0) {
for (WaterMarkView view : LIST) {
if (view != null) {
view
.setSyncTextSize(textSize);
}
}
}
}
/**
同步设置全部水印字体是否粗体
@param textBold 是否粗体(默认:false)
*/
public static void setTextBold(boolean textBold) {
assertInitialized();
INFO.setTextBold(textBold);
if (LIST.size() > 0) {
for (WaterMarkView view : LIST) {
if (view != null) {
view.setSyncTextBold(textBold);
}
}
}
}
/**
同步设置全部水印 X 轴偏移量（单位：px）
@param dx X 轴偏移量(默认:100px)
*/
public static void setDx(int dx) {
assertInitialized();
INFO.setDx(dx);
if (LIST.size() > 0) {
for (WaterMarkView view : LIST) {
if (view != null) {
view.setSyncDx(dx);
}
}
}
}
/**
同步设置全部水印 Y 轴偏移量（单位：px）
@param dy Y 轴偏移量(默认:240px)
*/
public static void setDy(int dy) {
assertInitialized();
INFO.setDy(dy);
if (LIST.size() > 0) {
for (WaterMarkView view : LIST) {
if (view != null) {
view.setSignDy(dy);
}
}
}
}
/**
同步设置全部水印对齐方式
@param align 对齐方式(默认:Center)
*/
public static void setAlign(Paint.Align align) {
assertInitialized();
INFO.setAlign(align);
if (LIST.size() > 0) {
for (WaterMarkView view : LIST) {
if (view != null) {
view.setSignAlign(align);
}
}
}
}
}
view_water_mark.xml
<?xml version="1.0" encoding="utf-8"?>
<com.commonlib.WaterMarkView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
import android.graphics.Color;
import android.graphics.Paint;
/**
@author Leon (wshk729@163.com)
@date 2018/8/24
<p>
*/
public class WaterMarkInfo {
private int mDegrees;
private int mTextColor;
private int mTextSize;
private boolean mTextBold;
private int mDx;
private int mDy;
private Paint.Align mAlign;
private WaterMarkInfo(int degrees, int textColor, int textSize, boolean textBold, int dx, int dy, Paint.Align align) {
mDegrees = degrees;
mTextColor = textColor;
mTextSize = textSize;
mTextBold = textBold;
mDx = dx;
mDy = dy;
mAlign = align;
}
public int getDegrees() {
return mDegrees;
}
public int getTextColor() {
return mTextColor;
}
public int getTextSize() {
return mTextSize;
}
public int getDx() {
return mDx;
}
public int getDy() {
return mDy;
}
public Paint.Align getAlign() {
return mAlign;
}
public int getAlignInt() {
switch (mAlign) {
case LEFT:
return 0;
case RIGHT:
return 2;
default:
return 1;
}
}
public boolean isTextBold() {
return mTextBold;
}
void setDegrees(int degrees) {
mDegrees = degrees;
}
void setTextColor(int textColor) {
mTextColor = textColor;
}
void setTextSize(int textSize) {
mTextSize = textSize;
}
void setTextBold(boolean textBold) {
mTextBold = textBold;
}
void setDx(int dx) {
mDx = dx;
}
void setDy(int dy) {
mDy = dy;
}
void setAlign(Paint.Align align) {
this.mAlign = align;
}
public static Builder create() {
return new Builder();
}
public static class Builder {
private int mDegrees;
private int mTextColor;
private int mTextSize;
private boolean mTextBold;
private int mDx;
private int mDy;
private Paint.Align mAlign;
private Builder() {
mDegrees = -30;
mTextColor = Color.parseColor("#33000000");
mTextSize = 35;
mTextBold = false;
mDx = 100;
mDy = 240;
mAlign = Paint.Align.CENTER;
}
/**
设置水印文字倾斜度
@param degrees 文字倾斜度(默认:-30)
@return Builder
*/
public Builder setDegrees(int degrees) {
mDegrees = degrees;
return this;
}
/**
设置水印文字颜色
@param textColor 文字颜色(默认:#33000000)
@return Builder
*/
public Builder setTextColor(int textColor) {
mTextColor = textColor;
return this;
}
/**
设置水印文字大小（单位：px）
@param textSize 文字大小(默认:42px)
@return Builder
*/
public Builder setTextSize(int textSize) {
mTextSize = textSize;
return this;
}
/**
设置水印文字是否加粗
@param textBold 文字加粗(默认:false)
@return Builder
*/
public Builder setTextBold(boolean textBold) {
mTextBold = textBold;
return this;
}
/**
设置水印文字 X 轴间距（单位：px）
@param dx 文字 X 轴间距(默认:100px)
@return Builder
*/
public Builder setDx(int dx) {
mDx = dx;
return this;
}
/**
设置水印文字 Y 轴间距（单位：px）
@param dy 文字 Y 轴间距(默认:240px)
@return Builder
*/
public Builder setDy(int dy) {
mDy = dy;
return this;
}
/**
设置水印文字对齐方式
@param align 对齐方式(默认:Center)
@return Builder
*/
public Builder setAlign(Paint.Align align) {
mAlign = align;
return this;
}
/**
生成水印全局配置信息
@return 配置信息
*/
public WaterMarkInfo generate() {
return new WaterMarkInfo(mDegrees, mTextColor, mTextSize, mTextBold, mDx, mDy, mAlign);
}
}
}
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;
import android.support.annotation.IntRange;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import java.util.List;
public class WaterMarkBg extends Drawable {
private Paint paint = new Paint();
private List<String> labels;
private Context context;
private int degress;//角度
private int fontSize;//字体大小 单位 sp
/**
初始化构造
@param context 上下文
@param labels 水印文字列表 多行显示支持
@param degress 水印角度
@param fontSize 水印文字大小
*/
public WaterMarkBg(Context context, List<String> labels, int degress, int fontSize) {
this.labels = labels;
this.context = context;
this.degress = degress;
this.fontSize = fontSize;
}
@Override
public void draw(@NonNull Canvas canvas) {
int width = getBounds().right;
int height = getBounds().bottom;
canvas.drawColor(Color.parseColor("#40F3F5F9"));
paint.setColor(Color.parseColor("#50AEAEAE"));
paint.setAntiAlias(true);
paint.setTextSize(sp2px(context,fontSize));
canvas.save();
canvas.rotate(degress);
float textWidth = paint.measureText(labels.get(0));
int index = 0;
for (int positionY = height / 10; positionY <= height; positionY += height / 10+80) {
float fromX = -width + (index++ % 2) * textWidth;
for (float positionX = fromX; positionX < width; positionX += textWidth * 2) {
int spacing = 0;//间距
for(String label:labels){
canvas.drawText(label, positionX, positionY+spacing, paint);
spacing = spacing+50;
}
}
}
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.UNKNOWN;
}
public static int sp2px(Context context, float spValue) {
final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
return (int) (spValue * fontScale + 0.5f);
}
}
xml 中 引用
<com.commonlib.WaterMarkView
android:singleLine="false"
android:id="@+id/wm"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:water_mark_align="CENTER"
app:water_mark_degree="-30"
app:water_mark_dx="100px"
app:water_mark_dy="240px"
app:water_mark_sync="true"
app:water_mark_text="再见孙悟空"
app:water_mark_textBold="false"
app:water_mark_textColor="@color/black"
app:water_mark_textSize="30px" />
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