前沿
不同的app可能需要加上不同的logo标识这张图片归属问题，比如微博图片可能涉及到原图版权，或者涉及到个人信息认证敏感信息，从安全的角度来说也需要加上特定的文本logo用于标识此图的所属用途。
需求：
拍照后加入文本水印合成一张图。
实现：
/**
* 给一张Bitmap添加水印文字。
*
* @param bitmap 源图片
* @param content 水印文本
* @param textSize 水印字体大小 ，单位pix。
* @param color 水印字体颜色。
* @param x 起始坐标x
* @param y 起始坐标y
*@param positionFlag 居左/居右
* @param recycle 是否回收
* @return 已经添加水印后的Bitmap。
*/
public static Bitmap addTextWatermark(Bitmap bitmap, String content, int textSize, int color, float x, float y,boolean positionFlag, boolean recycle) {
if (isEmptyBitmap(bitmap) || content == null)
return null;
Bitmap ret = bitmap.copy(bitmap.getConfig(), true);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
Canvas canvas = new Canvas(ret);
paint.setColor(color);
paint.setTextSize(textSize);
Rect bounds = new Rect();
paint.getTextBounds(content, 0, content.length(), bounds);
canvas.drawText(content, bitmap.getWidth() - x - bounds.width() - bounds.left, bitmap.getHeight() - bounds.height() - bounds.top - y, paint);
if (positionFlag) {
canvas.drawText(content, x, bitmap.getHeight() - bounds.height() - bounds.top - y, paint);
} else {
canvas.drawText(content, bitmap.getWidth() - x - bounds.width() - bounds.left, bitmap.getHeight() - bounds.height() - bounds.top - y, paint);
}
if (recycle && !bitmap.isRecycled())
bitmap.recycle();
return ret;
}
/**
* Bitmap对象是否为空。
*/
public static boolean isEmptyBitmap(Bitmap src) {
return src == null || src.getWidth() == 0 || src.getHeight() == 0;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Log.i(TAG, requestCode + " " + resultCode + " ");
// 拍照返回处理
if (requestCode == CAMERA_WITH_DATA && resultCode == Activity.RESULT_OK) {
try {
int degree = readPictureDegree(photoFilePath);
//压缩覆盖一下
Bitmap bm = thumbnailLoader.resizeBitmap(photoFilePath,
UIUtils.getScreenWidth(activityContext),
UIUtils.getScreenHeight(activityContext));
Bitmap degreeBM = null;
try {
//如果遇到图片旋转，纠正一下
if (degree != 0) {
//旋转图片 动作
Matrix matrix = new Matrix();
matrix.postRotate(degree);
// 创建新的图片
degreeBM = Bitmap.createBitmap(bm, 0, 0,
bm.getWidth(), bm.getHeight(), matrix, true);
}
} catch (Exception e) {
e.printStackTrace();
}
if (degreeBM != null) {
bm = degreeBM;
}
Bitmap bp= BitmapUtils.addTextWatermark(bm,"水印"+new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()),30, Color.WHITE,50.0f,50.0f,false,true);
if (bp != null) {
bm = bp;
}
FileOutputStream out = new FileOutputStream(photoFilePath);
bm.compress(Bitmap.CompressFormat.JPEG, 100, out);
out.flush();
out.close();
if (degreeBM != null && !degreeBM.isRecycled()) {
degreeBM.recycle();
}
if (bp != null && !bp.isRecycled()) {
bp.recycle();
}
if (bm != null && !bm.isRecycled()) {
bm.recycle();
}
IssueImageEntity li = new IssueImageEntity();
li.setPath(photoFilePath);
li.setUploadStatus("N");
photoList.add(li);
photoAdapter.notifyDataSetChanged();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(activityContext, "可能因硬件原因压缩照片异常 请重新拍照！" + "(" + e.getMessage() + ")", Toast.LENGTH_SHORT).show();
logManager.wirteLog("拍照", "拍照异常" + LogThrowableManager.getThrowableInfo(e));
}
}
还有就是加入图片中加入图片水印
/**
* 给图片添加水印，水印会根据图片宽高自动缩放处理
*
* @param watermark 水印
* @param image 添加水印的图片
* @param offsetX 添加水印的X轴偏移量
* @param offsetY 添加水印的Y轴偏移量
* @param srcWaterMarkImageWidth 水印对应的原图片宽度,即ui制作水印时候参考的图片画布宽度,应该是已知的图片最大宽度
* @param addInLeft true 在左下角添加水印，false 在右下角添加水印
*/
public static void addWatermark(Bitmap watermark, Bitmap image, int srcWaterMarkImageWidth, int offsetX, int offsetY, boolean addInLeft) {
int imageWidth = image.getWidth();
int imageHeight = image.getHeight();
if (0 == imageWidth || 0 == imageHeight) {
throw new RuntimeException("AlbumBuilder: 加水印的原图宽或高不能为0！");
}
int watermarkWidth = watermark.getWidth();
int watermarkHeight = watermark.getHeight();
float scale = imageWidth / (float) srcWaterMarkImageWidth;
if (scale > 1) scale = 1;
else if (scale < 0.4) scale = 0.4f;
int scaleWatermarkWidth = (int) (watermarkWidth * scale);
int scaleWatermarkHeight = (int) (watermarkHeight * scale);
Bitmap scaleWatermark = Bitmap.createScaledBitmap(watermark, scaleWatermarkWidth, scaleWatermarkHeight, true);
Canvas canvas = new Canvas(image);
Paint paint = new Paint();
paint.setAntiAlias(true);
if (addInLeft) {
canvas.drawBitmap(scaleWatermark, offsetX, imageHeight - scaleWatermarkHeight - offsetY, paint);
} else {
canvas.drawBitmap(scaleWatermark, imageWidth - offsetX - scaleWatermarkWidth, imageHeight - scaleWatermarkHeight - offsetY, paint);
}
recycle(scaleWatermark);
}
/**
* 给图片添加带文字和图片的水印，水印会根据图片宽高自动缩放处理
*
* @param watermark 水印图片
* @param image 要加水印的图片
* @param srcWaterMarkImageWidth 水印对应的原图片宽度,即ui制作水印时候参考的图片画布宽度,应该是已知的图片最大宽度
* @param text 要添加的文字
* @param offsetX 添加水印的X轴偏移量
* @param offsetY 添加水印的Y轴偏移量
* @param addInLeft true 在左下角添加水印，false 在右下角添加水印
*/
public static void addWatermarkWithText(@NonNull Bitmap watermark, Bitmap image, int srcWaterMarkImageWidth, @NonNull String text, int offsetX, int offsetY, boolean addInLeft) {
float imageWidth = image.getWidth();
float imageHeight = image.getHeight();
if (0 == imageWidth || 0 == imageHeight) {
throw new RuntimeException("AlbumBuilder: 加水印的原图宽或高不能为0！");
}
float watermarkWidth = watermark.getWidth();
float watermarkHeight = watermark.getHeight();
float scale = imageWidth / (float) srcWaterMarkImageWidth;
if (scale > 1) scale = 1;
else if (scale < 0.4) scale = 0.4f;
float scaleWatermarkWidth = watermarkWidth * scale;
float scaleWatermarkHeight = watermarkHeight * scale;
Bitmap scaleWatermark = Bitmap.createScaledBitmap(watermark, (int) scaleWatermarkWidth, (int) scaleWatermarkHeight, true);
Canvas canvas = new Canvas(image);
Paint textPaint = new TextPaint();
textPaint.setAntiAlias(true);
textPaint.setColor(Color.WHITE);
float textsize = (float) (scaleWatermark.getHeight() * 2) / (float) 3;
textPaint.setTextSize(textsize);
Rect textRect = new Rect();
textPaint.getTextBounds(text, 0, text.length(), textRect);
if (addInLeft) {
canvas.drawText(text, scaleWatermarkWidth + offsetX, imageHeight - textRect.height() - textRect.top - offsetY, textPaint);
} else {
canvas.drawText(text, imageWidth - offsetX - textRect.width() - textRect.left, imageHeight - textRect.height() - textRect.top - offsetY, textPaint);
}
Paint sacleWatermarkPaint = new Paint();
sacleWatermarkPaint.setAntiAlias(true);
if (addInLeft) {
canvas.drawBitmap(scaleWatermark, offsetX, imageHeight - textRect.height() - offsetY - scaleWatermarkHeight / 6, sacleWatermarkPaint);
} else {
canvas.drawBitmap(scaleWatermark, imageWidth - textRect.width() - offsetX - scaleWatermarkWidth / 6, imageHeight - textRect.height() - offsetY - scaleWatermarkHeight / 6, sacleWatermarkPaint);
}
recycle(scaleWatermark);
}
/**
* 保存Bitmap到指定文件夹
*
* @param act 上下文
* @param dirPath 文件夹全路径
* @param bitmap bitmap
* @param namePrefix 保存文件的前缀名，文件最终名称格式为：前缀名+自动生成的唯一数字字符+.png
* @param notifyMedia 是否更新到媒体库
* @param callBack 保存图片后的回调，回调已经处于UI线程
*/
public static void saveBitmapToDir(final Activity act, final String dirPath, final String namePrefix, final Bitmap bitmap, final boolean notifyMedia, final SaveBitmapCallBack callBack) {
new Thread(new Runnable() {
@Override
public void run() {
File dirF = new File(dirPath);
if (!dirF.exists() || !dirF.isDirectory()) {
if (!dirF.mkdirs()) {
act.runOnUiThread(new Runnable() {
@Override
public void run() {
callBack.onCreateDirFailed();
}
});
return;
}
}
try {
final File writeFile = File.createTempFile(namePrefix, ".png", dirF);
FileOutputStream fos = null;
fos = new FileOutputStream(writeFile);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.flush();
fos.close();
if (notifyMedia) {
// EasyPhotos.notifyMedia(act, writeFile);
}
act.runOnUiThread(new Runnable() {
@Override
public void run() {
callBack.onSuccess(writeFile);
}
});
} catch (final IOException e) {
act.runOnUiThread(new Runnable() {
@Override
public void run() {
callBack.onIOFailed(e);
}
});
}
}
}).start();
}
参考链接：
https://github.com/HuanTanSheng/EasyPhotos
https://github.com/huangyz0918/AndroidWM
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