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Dernière activité 1756431645

通过生成一个自定义的Drawble，传入指定的Activity上下文来添加全屏水印浮层

doracoin a révisé ce gist 1756431645. Aller à la révision

1 file changed, 237 insertions

Watermark.java(fichier créé)

@@ -0,0 +1,237 @@
1 + import android.app.Activity;
2 + import android.content.res.Resources;
3 + import android.graphics.Canvas;
4 + import android.graphics.ColorFilter;
5 + import android.graphics.Paint;
6 + import android.graphics.PixelFormat;
7 + import android.graphics.drawable.Drawable;
8 + import android.text.TextUtils;
9 + import android.view.View;
10 + import android.view.ViewGroup;
11 + import android.widget.FrameLayout;
12 +
13 + import androidx.annotation.IntRange;
14 + import androidx.annotation.NonNull;
15 + import androidx.annotation.Nullable;
16 +
17 + /**
18 + * 水印
19 + */
20 + public class Watermark {
21 + /**
22 + * 水印文本
23 + */
24 + private String mText;
25 + /**
26 + * 字体颜色(argb)，十六进制形式，例如：0xAEAEAEAE
27 + */
28 + private int mTextColor;
29 + /**
30 + * 字体大小，单位为sp
31 + */
32 + private float mTextSize;
33 + /**
34 + * 旋转角度
35 + */
36 + private float mRotation;
37 + private static Watermark sInstance;
38 +
39 + private Watermark() {
40 + mText = "";
41 + mTextColor = 0xAECECECE;
42 + mTextSize = 18;
43 + mRotation = -45;
44 + }
45 +
46 + public static Watermark getInstance() {
47 + if (sInstance == null) {
48 + synchronized (Watermark.class) {
49 + sInstance = new Watermark();
50 + }
51 + }
52 + return sInstance;
53 + }
54 +
55 + /**
56 + * 设置水印文本
57 + *
58 + * @param text 文本
59 + * @return Watermark实例
60 + */
61 + public Watermark setText(String text) {
62 + mText = text;
63 + return sInstance;
64 + }
65 +
66 + /**
67 + * 设置字体颜色
68 + *
69 + * @param color 颜色，十六进制形式，例如：0xAEAEAEAE
70 + * @return Watermark实例
71 + */
72 + public Watermark setTextColor(int color) {
73 + mTextColor = color;
74 + return sInstance;
75 + }
76 +
77 + /**
78 + * 设置字体大小
79 + *
80 + * @param size 大小，单位为sp
81 + * @return Watermark实例
82 + */
83 + public Watermark setTextSize(float size) {
84 + mTextSize = size;
85 + return sInstance;
86 + }
87 +
88 + /**
89 + * 设置旋转角度
90 + *
91 + * @param degrees 度数
92 + * @return Watermark实例
93 + */
94 + public Watermark setRotation(float degrees) {
95 + mRotation = degrees;
96 + return sInstance;
97 + }
98 +
99 + /**
100 + * 显示水印，铺满整个页面
101 + *
102 + * @param activity 活动
103 + */
104 + public void show(Activity activity) {
105 + show(activity, mText);
106 + }
107 +
108 + /**
109 + * 显示水印，铺满整个页面
110 + *
111 + * @param activity 活动
112 + * @param text 水印
113 + */
114 + public void show(Activity activity, String text) {
115 + if (activity == null || TextUtils.isEmpty(text)) {
116 + return;
117 + }
118 + WatermarkDrawable drawable = new WatermarkDrawable();
119 + drawable.mText = text;
120 + drawable.mTextColor = mTextColor;
121 + drawable.mTextSize = mTextSize;
122 + drawable.mRotation = mRotation;
123 +
124 + ViewGroup rootView = activity.findViewById(android.R.id.content);
125 + FrameLayout layout = new FrameLayout(activity);
126 + layout.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
127 + ViewGroup.LayoutParams.MATCH_PARENT));
128 + layout.setBackground(drawable);
129 + rootView.addView(layout);
130 + }
131 +
132 + /**
133 + * 显示水印，只给指定的View设置水印背景
134 + * @param view
135 + * @param text
136 + */
137 + public void show(View view, String text) {
138 + if (view == null || TextUtils.isEmpty(text)) {
139 + return;
140 + }
141 + WatermarkDrawable drawable = build(text);
142 + view.setBackground(drawable);
143 + }
144 +
145 + private WatermarkDrawable build(String text){
146 + WatermarkDrawable drawable = new WatermarkDrawable();
147 + drawable.mText = text;
148 + drawable.mTextColor = mTextColor;
149 + drawable.mTextSize = mTextSize;
150 + drawable.mRotation = mRotation;
151 + return drawable;
152 + }
153 +
154 + public FrameLayout buildWaterMarkFrame(Activity activity, String text) {
155 + FrameLayout layout = new FrameLayout(activity);
156 + layout.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
157 + ViewGroup.LayoutParams.MATCH_PARENT));
158 + layout.setBackground(build(text));
159 + return layout;
160 + }
161 +
162 + private class WatermarkDrawable extends Drawable {
163 + private Paint mPaint;
164 + /**
165 + * 水印文本
166 + */
167 + private String mText;
168 + /**
169 + * 字体颜色，十六进制形式，例如：0xAEAEAEAE
170 + */
171 + private int mTextColor;
172 + /**
173 + * 字体大小，单位为sp
174 + */
175 + private float mTextSize;
176 + /**
177 + * 旋转角度
178 + */
179 + private float mRotation;
180 +
181 + private WatermarkDrawable() {
182 + mPaint = new Paint();
183 + }
184 +
185 + @Override
186 + public void draw(@NonNull Canvas canvas) {
187 + int width = getBounds().right;
188 + int height = getBounds().bottom;
189 + int diagonal = (int) Math.sqrt(width * width + height * height); // 对角线的长度
190 +
191 + mPaint.setColor(mTextColor);
192 + mPaint.setTextSize(spToPx(mTextSize));
193 + mPaint.setAntiAlias(true);
194 + float textWidth = mPaint.measureText(mText);
195 +
196 + canvas.drawColor(0x00000000);
197 + canvas.rotate(mRotation);
198 +
199 + int index = 0;
200 + float fromX;
201 + for (int positionY = diagonal / 7; positionY <= diagonal; positionY += diagonal / 7) {
202 + fromX = -width + (index++ % 2) * textWidth; // 上下两行的X轴起始点不一样，错开显示
203 + for (float positionX = fromX; positionX < width; positionX += textWidth * 3) {
204 + canvas.drawText(mText, positionX, positionY, mPaint);
205 + }
206 + }
207 +
208 + canvas.save();
209 + canvas.restore();
210 + }
211 +
212 + @Override
213 + public void setAlpha(@IntRange(from = 0, to = 255) int alpha) {
214 + }
215 +
216 + @Override
217 + public void setColorFilter(@Nullable ColorFilter colorFilter) {
218 + }
219 +
220 + @Override
221 + public int getOpacity() {
222 + return PixelFormat.TRANSLUCENT;
223 + }
224 +
225 + }
226 +
227 + /**
228 + * Value of sp to value of px.
229 + *
230 + * @param spValue The value of sp.
231 + * @return value of px
232 + */
233 + public static int spToPx(float spValue) {
234 + float fontScale = Resources.getSystem().getDisplayMetrics().scaledDensity;
235 + return (int) (spValue * fontScale + 0.5f);
236 + }
237 + }
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