When we are working on projects, we sometimes need to add watermarks to the images. Shuihan encountered such a problem today, so we created a tool class and posted it and called it directly.
/**
* Picture tool category
* @author Shuihan
*
*/
public class ImageUtil {
/**
* Set the watermark image in the upper left corner
* @param Context
* @param src
* @param watermark
* @param paddingLeft
* @param paddingTop
* @return
*/
public static Bitmap createWaterMaskLeftTop(
Context context, Bitmap src, Bitmap watermark,
int paddingLeft, int paddingTop) {
return createWaterMaskBitmap(src, watermark,
dp2px(context, paddingLeft), dp2px(context, paddingTop));
}
private static Bitmap createWaterMaskBitmap(Bitmap src, Bitmap watermark,
int paddingLeft, int paddingTop) {
if (src == null) {
return null;
}
int width = ();
int height = ();
//Create a bitmap Bitmap newb = (width, height, Config.ARGB_8888);// Create a new bitmap with the same length and width as the SRC //Please this picture as a canvas Canvas canvas = new Canvas(newb);
//Start drawing original picture on the canvas 0, 0 coordinates (src, 0, 0, null);
//Draw watermark pictures on the canvas (watermark, paddingLeft, paddingTop, null);
// Save (Canvas.ALL_SAVE_FLAG);
// Storage ();
return newb;
}
/**
* Set the watermark image in the lower right corner
* @param Context
* @param src
* @param watermark
* @param paddingRight
* @param paddingBottom
* @return
*/
public static Bitmap createWaterMaskRightBottom(
Context context, Bitmap src, Bitmap watermark,
int paddingRight, int paddingBottom) {
return createWaterMaskBitmap(src, watermark,
() - () - dp2px(context, paddingRight),
() - () - dp2px(context, paddingBottom));
}
/**
* Set the watermark image to the upper right corner
* @param Context
* @param src
* @param watermark
* @param paddingRight
* @param paddingTop
* @return
*/
public static Bitmap createWaterMaskRightTop(
Context context, Bitmap src, Bitmap watermark,
int paddingRight, int paddingTop) {
return createWaterMaskBitmap( src, watermark,
() - () - dp2px(context, paddingRight),
dp2px(context, paddingTop));
}
/**
* Set the watermark image to the lower left corner
* @param Context
* @param src
* @param watermark
* @param paddingLeft
* @param paddingBottom
* @return
*/
public static Bitmap createWaterMaskLeftBottom(
Context context, Bitmap src, Bitmap watermark,
int paddingLeft, int paddingBottom) {
return createWaterMaskBitmap(src, watermark, dp2px(context, paddingLeft),
() - () - dp2px(context, paddingBottom));
}
/**
* Set the watermark picture to the middle
* @param Context
* @param src
* @param watermark
* @return
*/
public static Bitmap createWaterMaskCenter(Bitmap src, Bitmap watermark) {
return createWaterMaskBitmap(src, watermark,
(() - ()) / 2,
(() - ()) / 2);
}
/**
* Add text to the image to the upper left corner
* @param context
* @param bitmap
* @param text
* @return
*/
public static Bitmap drawTextToLeftTop(Context context, Bitmap bitmap, String text,
int size, int color, int paddingLeft, int paddingTop) {
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
(color);
(dp2px(context, size));
Rect bounds = new Rect();
(text, 0, (), bounds);
return drawTextToBitmap(context, bitmap, text, paint, bounds,
dp2px(context, paddingLeft),
dp2px(context, paddingTop) + ());
}
/**
* Draw text to the lower right corner
* @param context
* @param bitmap
* @param text
* @param size
* @param color
* @param paddingLeft
* @param paddingTop
* @return
*/
public static Bitmap drawTextToRightBottom(Context context, Bitmap bitmap, String text,
int size, int color, int paddingRight, int paddingBottom) {
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
(color);
(dp2px(context, size));
Rect bounds = new Rect();
(text, 0, (), bounds);
return drawTextToBitmap(context, bitmap, text, paint, bounds,
() - () - dp2px(context, paddingRight),
() - dp2px(context, paddingBottom));
}
/**
* Draw text to the upper right
* @param context
* @param bitmap
* @param text
* @param size
* @param color
* @param paddingRight
* @param paddingTop
* @return
*/
public static Bitmap drawTextToRightTop(Context context, Bitmap bitmap, String text,
int size, int color, int paddingRight, int paddingTop) {
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
(color);
(dp2px(context, size));
Rect bounds = new Rect();
(text, 0, (), bounds);
return drawTextToBitmap(context, bitmap, text, paint, bounds,
() - () - dp2px(context, paddingRight),
dp2px(context, paddingTop) + ());
}
/**
* Draw text to the bottom left
* @param context
* @param bitmap
* @param text
* @param size
* @param color
* @param paddingLeft
* @param paddingBottom
* @return
*/
public static Bitmap drawTextToLeftBottom(Context context, Bitmap bitmap, String text,
int size, int color, int paddingLeft, int paddingBottom) {
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
(color);
(dp2px(context, size));
Rect bounds = new Rect();
(text, 0, (), bounds);
return drawTextToBitmap(context, bitmap, text, paint, bounds,
dp2px(context, paddingLeft),
() - dp2px(context, paddingBottom));
}
/**
* Draw text to the middle
* @param context
* @param bitmap
* @param text
* @param size
* @param color
* @return
*/
public static Bitmap drawTextToCenter(Context context, Bitmap bitmap, String text,
int size, int color) {
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
(color);
(dp2px(context, size));
Rect bounds = new Rect();
(text, 0, (), bounds);
return drawTextToBitmap(context, bitmap, text, paint, bounds,
(() - ()) / 2,
(() + ()) / 2);
}
//Draw text on the picture private static Bitmap drawTextToBitmap(Context context, Bitmap bitmap, String text,
Paint paint, Rect bounds, int paddingLeft, int paddingTop) {
bitmapConfig = ();
(true); // Get clear image sampling (true);// Filter some if (bitmapConfig == null) {
bitmapConfig = .ARGB_8888;
}
bitmap = (bitmapConfig, true);
Canvas canvas = new Canvas(bitmap);
(text, paddingLeft, paddingTop, paint);
return bitmap;
}
/**
* Zoom picture
* @param src
* @param w
* @param h
* @return
*/
public static Bitmap scaleWithWH(Bitmap src, double w, double h) {
if (w == 0 || h == 0 || src == null) {
return src;
} else {
// Record the width and height of src int width = ();
int height = ();
// Create a matrix container Matrix matrix = new Matrix();
// Calculate the scaling ratio float scaleWidth = (float) (w / width);
float scaleHeight = (float) (h / height);
// Start scaling (scaleWidth, scaleHeight);
// Create a zoomed picture return (src, 0, 0, width, height, matrix, true);
}
}
/**
* Dip to Pix
* @param context
* @param dp
* @return
*/
public static int dp2px(Context context, float dp) {
final float scale = ().getDisplayMetrics().density;
return (int) (dp * scale + 0.5f);
}
}
How to use it is as follows:
Add a layout, the above is the original image, the following is the image after adding a watermark
<LinearLayout xmlns:andro
xmlns:tools="/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Original Picture" />
<ImageView
android:
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="centerInside"/>
<TextView
android:
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Watermark" />
<ImageView
android:
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="centerInside"/>
</LinearLayout>
Get the ImageView object in the Activity, and get the Bitmap object, perform canva drawing of Bitmap, and add a watermark:
/**
* Picture tool category
* @author Shuihan
*
*/
public class MainActivity extends Activity {
private ImageView mSourImage;
private ImageView mWartermarkImage;
@Override
protected void onCreate(Bundle savedInstanceState) {
(savedInstanceState);
setContentView(.activity_main);
initView();
}
private void initView(){
mSourImage = (ImageView) findViewById(.sour_pic);
mWartermarkImage = (ImageView) findViewById(.wartermark_pic);
Bitmap sourBitmap = (getResources(), .sour_pic);
(sourBitmap);
Bitmap waterBitmap = (getResources(), );
Bitmap watermarkBitmap = (sourBitmap, waterBitmap);
watermarkBitmap = (this, watermarkBitmap, waterBitmap, 0, 0);
watermarkBitmap = (this, watermarkBitmap, waterBitmap, 0, 0);
watermarkBitmap = (this, watermarkBitmap, waterBitmap, 0, 0);
watermarkBitmap = (this, watermarkBitmap, waterBitmap, 0, 0);
Bitmap textBitmap = (this, watermarkBitmap, "Upper left corner", 16, , 0, 0);
textBitmap = (this, textBitmap, "Lower Right", 16, , 0, 0);
textBitmap = (this, textBitmap, "Upper Right", 16, , 0, 0);
textBitmap = (this, textBitmap, "Lower left corner", 16, , 0, 0);
textBitmap = (this, textBitmap, "middle", 16, );
(textBitmap);
}
}
The above is all the content of this article. I hope it will be helpful to everyone's study and I hope everyone will support me more.