App中所有页面添加水印（支持单行和多行）

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	比较很少见的奇葩功能，给App所有界面添加水印功能。
网上有单行，多行的这里为了方便使用，集成了既支持单行又支持多行的功能。
废话不多说，直接上代码：

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public class Watermark {
/**
* 水印文本
*/
private String mText;
private List<String> labels;
/**
* 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 Watermark sInstance;
private Watermark() {
mText = "";
mTextColor = 0xAEAEAEAE;
mTextSize = 18;
mRotation = -25;
}
public static Watermark getInstance() {
if (sInstance == null) {
synchronized (Watermark.class) {
sInstance = new Watermark();
}
}
return sInstance;
}
/**
* 设置水印文本
*
* @param text 文本
* @return Watermark实例
*/
public Watermark setText(String text) {
mText = text;
return sInstance;
}
/**
* 设置多行水印文本
*
* @return Watermark实例
*/
public Watermark setMultiLine(List<String> lab) {
labels = lab;
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 Watermark 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 Watermark setTextSize(float size) {
mTextSize = size;
return sInstance;
}
/**
* 设置旋转角度
*
* @param degrees 度数
* @return Watermark实例
*/
public Watermark 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) {
WatermarkDrawable drawable = new WatermarkDrawable();
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);
layout.setAlpha(0.3f);
rootView.addView(layout);
}
private class WatermarkDrawable extends Drawable {
private Paint mPaint;
/**
* 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 WatermarkDrawable() {
mPaint = new Paint();
}
@Override
public void draw(@NonNull Canvas canvas) {
if(labels!=null&&labels.size()>0){
//多行文本
int width = getBounds().right;
int height = getBounds().bottom;
canvas.drawColor(0x00000000);
mPaint.setColor(mTextColor);
mPaint.setAntiAlias(true);
mPaint.setTextSize(ConvertUtils.spToPx(mTextSize));
canvas.save();
canvas.rotate(mRotation);
//计算集合中最长的宽度
float textWidth = 0;
for (int i = 0; i < labels.size(); i++) {
if(textWidth<mPaint.measureText(labels.get(i))){
textWidth = mPaint.measureText(labels.get(i));
}
}
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, mPaint);
spacing = spacing+50;
}
}
}
canvas.restore();
}else if(!TextUtils.isEmpty(mText)){
//单行文本
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(ConvertUtils.spToPx(mTextSize)); // ConvertUtils.spToPx()这个方法是将sp转换成px，ConvertUtils这个工具类在我提供的demo里面有
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;
}
}
}

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public class ConvertUtils {
/**
* Value of sp to value of px.
*
* @param spValue The value of sp.
* @return value of px
*/
public static int spToPx(float spValue) {
float fontScale = Resources.getSystem().getDisplayMetrics().scaledDensity;
return (int) (spValue * fontScale + 0.5f);
}
}

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@Override
public void setContentView(int layoutResID) {
super.setContentView(layoutResID);
Watermark.getInstance()
.setText("水印的内容")
.setTextColor(0xAE000000)
.setTextSize(14)
.setRotation(-30)
.show(this);
}

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@Override
public void setContentView(int layoutResID) {
super.setContentView(layoutResID);
String dateTimeFormat = DateUtil.getDateTimeFormat(new Date());
Staff staff = ProjectNameApp.getInstance().getStaff();
// 可以自定义水印文字颜色、大小和旋转角度
List<String> labels = new ArrayList<>();
labels.add(staff.getName());
labels.add(staff.getMobile());
labels.add(dateTimeFormat);
Watermark.getInstance()
.setMultiLine(labels)
.setTextColor(0xAE000000)
.setTextSize(14)
.setRotation(-30)
.show(this);
}