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();

}