项目中有需要加水印的需求，实现完效果图是这样的
什么看不清...
为了让大家看清效果，字体改了一下，正常应该是文章最上面那个的效果。话不多说，直接上代码
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import com.hkdc.commonlib.R;
public class WaterMarkView extends View {
private static final String DEFAULT_SEPARATOR = "///";
private TextPaint mTextPaint = new TextPaint();
private String[] mText;
private int mDegrees;
private int mTextColor;
private int mTextSize=35;
private boolean mTextBold;
private int mDx;
private int mDy;
private Paint.Align mAlign;
private boolean mSync;
private int textWidth, textHeight;
public WaterMarkView(Context context) {
this(context, null);
}
public WaterMarkView(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.WaterMarkView);
mDegrees = typedArray.getInt(R.styleable.WaterMarkView_water_mark_degree, WaterMarkManager.INFO != null ? WaterMarkManager.INFO.getDegrees() : -30);
String text = typedArray.getString(R.styleable.WaterMarkView_water_mark_text);
if (text != null) {
mText = text.split(DEFAULT_SEPARATOR);
}
mTextColor = typedArray.getColor(R.styleable.WaterMarkView_water_mark_textColor, WaterMarkManager.INFO != null ? WaterMarkManager.INFO.getTextColor() : Color.parseColor("#33000000"));
mTextSize = typedArray.getDimensionPixelSize(R.styleable.WaterMarkView_water_mark_textSize, WaterMarkManager.INFO != null ? WaterMarkManager.INFO.getTextSize() : 42);
mTextBold = typedArray.getBoolean(R.styleable.WaterMarkView_water_mark_textBold, WaterMarkManager.INFO != null && WaterMarkManager.INFO.isTextBold());
mDx = typedArray.getDimensionPixelSize(R.styleable.WaterMarkView_water_mark_dx, WaterMarkManager.INFO != null ? WaterMarkManager.INFO.getDx() : 100);
mDy = typedArray.getDimensionPixelSize(R.styleable.WaterMarkView_water_mark_dy, WaterMarkManager.INFO != null ? WaterMarkManager.INFO.getDy() : 240);
int align = typedArray.getInt(R.styleable.WaterMarkView_water_mark_align, WaterMarkManager.INFO != null ? WaterMarkManager.INFO.getAlignInt() : 1);
mAlign = align == 0 ? Paint.Align.LEFT : align == 2 ? Paint.Align.RIGHT : Paint.Align.CENTER;
mSync = typedArray.getBoolean(R.styleable.WaterMarkView_water_mark_sync, true);
typedArray.recycle();
setBackgroundColor(Color.TRANSPARENT);
mTextPaint.setAntiAlias(true);
mTextPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
mTextPaint.setColor(mTextColor);
mTextPaint.setTextSize(mTextSize);
mTextPaint.setTypeface(mTextBold ? Typeface.DEFAULT_BOLD : Typeface.DEFAULT);
mTextPaint.setTextAlign(mAlign);
mText = mText == null && mSync ? WaterMarkManager.CONTENT : mText;
textWidth = 0;
textHeight = 0;
if (mText != null && mText.length > 0) {
for (String s : mText) {
Rect tvRect = new Rect();
mTextPaint.getTextBounds(s, 0, s.length(), tvRect);
textWidth = textWidth > tvRect.width() ? textWidth : tvRect.width();
textHeight += (tvRect.height() + 10);
}
}
if (mSync) {
WaterMarkManager.LIST.add(this);
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mText != null && mText.length > 0) {
int measuredWidth = getMeasuredWidth();
int measuredHeight = getMeasuredHeight();
if (measuredWidth == 0 || measuredHeight == 0) {
return;
}
int canvasLength = measuredWidth > measuredHeight ? measuredWidth : measuredHeight;
canvas.save();
canvas.rotate(mDegrees, measuredWidth / 2, measuredHeight / 2);
canvas.save();
int y = 0;
boolean odd = true;
while (y < canvasLength + textHeight) {
int x = odd ? 0 : -(textWidth + mDx) / 2;
while (x < canvasLength + textWidth) {
drawTexts(mText, mTextPaint, canvas, x, y);
x = x + textWidth + mDx;
}
y = y + textHeight + mDy;
odd = !odd;
}
canvas.restore();
}
}
private void drawTexts(String[] ss, Paint paint, Canvas canvas, int x, int y) {
Paint.FontMetrics fontMetrics = paint.getFontMetrics();
float top = fontMetrics.top;
float bottom = fontMetrics.bottom;
int length = ss.length;
float total = (length - 1) * (bottom - top) + (fontMetrics.descent - fontMetrics.ascent);
float offset = total / 2 - bottom;
for (int i = 0; i < length; i++) {
float yAxis = -(length - i - 1) * (bottom - top) + offset;
canvas.drawText(ss[i], x, y + yAxis + 10, paint);
}
}
/**
* 设置水印文字内容
*
* @param text 文字内容
*/
public void setText(String... text) {
mText = text;
textWidth = 0;
textHeight = 0;
if (mText != null && mText.length > 0) {
for (String s : mText) {
Rect tvRect = new Rect();
mTextPaint.getTextBounds(s, 0, s.length(), tvRect);
textWidth = textWidth > tvRect.width() ? textWidth : tvRect.width();
textHeight += (tvRect.height() + 10);
}
}
postInvalidate();
}
/**
* 同步设置水印文字内容
*
* @param text 文字内容
*/
void setSyncText(String... text) {
if (mSync) {
setText(text);
}
}
/**
* 设置水印倾斜角度
*
* @param degrees 倾斜角度(默认:-30)
*/
public void setDegrees(int degrees) {
mDegrees = degrees;
postInvalidate();
}
/**
* 同步设置水印倾斜角度
*
* @param degrees 倾斜角度(默认:-30)
*/
void setSyncDegrees(int degrees) {
if (mSync) {
setDegrees(degrees);
}
}
/**
* 设置水印字体颜色
*
* @param textColor 字体颜色(默认:#33000000)
*/
public void setTextColor(int textColor) {
mTextColor = textColor;
mTextPaint.setColor(mTextColor);
postInvalidate();
}
/**
* 同步设置水印字体颜色
*
* @param textColor 字体颜色(默认:#33000000)
*/
void setSyncTextColor(int textColor) {
if (mSync) {
setTextColor(textColor);
}
}
/**
* 设置水印字体大小（单位：px）
*
* @param textSize 字体大小(默认:42px)
*/
public void setTextSize(int textSize) {
mTextSize = textSize;
mTextPaint.setTextSize(30);
postInvalidate();
}
/**
* 同步设置水印字体大小（单位：px）
*
* @param textSize 字体大小(默认:42px)
*/
void setSyncTextSize(int textSize) {
if (mSync) {
setTextSize(30);
}
}
/**
* 设置水印字体是否粗体
*
* @param textBold 是否粗体(默认:false)
*/
public void setTextBold(boolean textBold) {
mTextBold = textBold;
mTextPaint.setTypeface(mTextBold ? Typeface.DEFAULT_BOLD : Typeface.DEFAULT);
postInvalidate();
}
/**
* 同步设置水印字体是否粗体
*
* @param textBold 是否粗体(默认:false)
*/
void setSyncTextBold(boolean textBold) {
if (mSync) {
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;
}
}
<!--warkmark-->
<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" />
activity中
private WaterMarkView wm;
wm = (WaterMarkView) findViewById(R.id.wm);
private void water() {
SharedPreferences jobcede = getSharedPreferences("jobcede", MODE_PRIVATE);
String userName = jobcede.getString("username", "");
String name = jobcede.getString("name", "");
wm.setText(name,userName);
}
核心的代码就这些，因为时间关系，完整的demo后续补充。希望对大家有所帮助。欢迎各位小伙伴加入我的qq群：开发一群：454430053 （付费）开发二群：537532956 （付费）开发三群：812695329（免费）这里已经有很多小伙伴在等你了，快来加入我们吧！
