android设置图片的方法吗,Android设置图片圆角的方法

于 2021-05-26 07:17:23 发布
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文章标签： android设置图片的方法吗

Android中经常会遇到对图片进行二次处理，例如加圆角，或者显示圆形图片

实现的效果图：

82fbd0b5bcd38342f4b7e3621f30aa10.png

方法一：

通过第三方框架Glide实现图片显示有圆角，有三种写法如下：

1.1、第一种实现：

RequestOptions options = new RequestOptions().error(R.drawable.img_load_failure).bitmapTransform(new RoundedCorners(30));//图片圆角为30

Glide.with(this).load(URL) //图片地址

.apply(options)

.into(ImagView);

1.2、第二种实现：

RequestOptions requestOptions = new RequestOptions();

requestOptions.placeholder(R.drawable.ic_launcher_background);

requestOptions.circleCropTransform();

requestOptions.transforms( new RoundedCorners(30));

Glide.with(this).load(URL) //图片地址

.apply(options)

.into(ImagView);

1.3、第三种实现：

RequestOptions options = new RequestOptions().centerCrop() .transform(new RoundTransform(this,30));

Glide.with(this).load(URL) //图片地址

.apply(options)

.into(ImagView);

public class RoundTransform extends BitmapTransformation {

private static float radius = 0f;

public RoundTransform(Context context) {

this(context, 4);

}

public RoundTransform(Context context, int dp) {

super(context);

this.radius = Resources.getSystem().getDisplayMetrics().density * dp;

}

@Override

protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {

Bitmap bitmap = TransformationUtils.centerCrop(pool, toTransform, outWidth, outHeight);

return roundCrop(pool, bitmap);

}

private static Bitmap roundCrop(BitmapPool pool, Bitmap source) {

if (source == null) return null;

Bitmap result = pool.get(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);

if (result == null) {

result = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);

}

Canvas canvas = new Canvas(result);

Paint paint = new Paint();

paint.setShader(new BitmapShader(source, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));

paint.setAntiAlias(true);

RectF rectF = new RectF(0f, 0f, source.getWidth(), source.getHeight());

canvas.drawRoundRect(rectF, radius, radius, paint);

return result;

}

public String getId() {

return getClass().getName() + Math.round(radius);

}

@Override

public void updateDiskCacheKey(MessageDigest messageDigest) {

}

}

方法二：

自定义ImageView：

android:id="@+id/iv"

android:layout_width="300dp"

android:layout_height="300dp"

android:layout_centerHorizontal="true"

/>

ImageView iv = findViewById(R.id.iv);

Bitmap bitmap =BitmapFactory.decodeResource(getResources(), R.drawable.fengjing);

Bitmap outBitmap =getRoundBitmapByShader(bitmap, 500,300,20, 3);

iv.setImageBitmap(outBitmap);

public class RoundRectImageView extends ImageView{

private Paint paint;

public RoundRectImageView(Context context) {

this(context,null);

}

public RoundRectImageView(Context context, AttributeSet attrs) {

this(context, attrs,0);

}

public RoundRectImageView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

paint = new Paint();

}

/**

* 绘制圆角矩形图片

* @author caizhiming

*/

@Override

protected void onDraw(Canvas canvas) {

Drawable drawable = getDrawable();

if (null != drawable) {

Bitmap bitmap = getBitmapFromDrawable(drawable);

// Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();

Bitmap b = getRoundBitmapByShader(bitmap,getWidth(),getHeight(), 50,0);

final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight());

final Rect rectDest = new Rect(0,0,getWidth(),getHeight());

paint.reset();

canvas.drawBitmap(b, rectSrc, rectDest, paint);

} else {

super.onDraw(canvas);

}

}

/**

* 把资源图片转换成Bitmap

* @param drawable

* 资源图片

* @return 位图

*/

public static Bitmap getBitmapFromDrawable(Drawable drawable) {

int width = drawable.getIntrinsicWidth();

int height = drawable.getIntrinsicHeight();

Bitmap bitmap = Bitmap.createBitmap(width, height, drawable

.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888

: Bitmap.Config.RGB_565);

Canvas canvas = new Canvas(bitmap);

//drawable.setBounds(-4, -4, width + 4, height + 4);

drawable.draw(canvas);

return bitmap;

}

public static Bitmap getRoundBitmapByShader(Bitmap bitmap, int outWidth, int outHeight, int radius, int boarder) {

if (bitmap == null) {

return null;

}

int width = bitmap.getWidth();

int height = bitmap.getHeight();

float widthScale = outWidth * 1f / width;

float heightScale = outHeight * 1f / height;

Matrix matrix = new Matrix();

matrix.setScale(widthScale, heightScale);

//创建输出的bitmap

Bitmap desBitmap = Bitmap.createBitmap(outWidth, outHeight, Bitmap.Config.ARGB_8888);

//创建canvas并传入desBitmap，这样绘制的内容都会在desBitmap上

Canvas canvas = new Canvas(desBitmap);

Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);

//创建着色器

BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);

//给着色器配置matrix

bitmapShader.setLocalMatrix(matrix);

paint.setShader(bitmapShader);

//创建矩形区域并且预留出border

RectF rect = new RectF(boarder, boarder, outWidth - boarder, outHeight - boarder);

//把传入的bitmap绘制到圆角矩形区域内

canvas.drawRoundRect(rect, radius, radius, paint);

if (boarder > 0) {

//绘制boarder

Paint boarderPaint = new Paint(Paint.ANTI_ALIAS_FLAG);

boarderPaint.setColor(Color.GREEN);

boarderPaint.setStyle(Paint.Style.STROKE);

boarderPaint.setStrokeWidth(boarder);

canvas.drawRoundRect(rect, radius, radius, boarderPaint);

}

return desBitmap;

}

}

方法三：

对图片进行处理，此方法还可以加边框

/**

* 通过BitmapShader实现圆形边框

* @param bitmap

* @param outWidth 输出的图片宽度

* @param outHeight 输出的图片高度

* @param radius 圆角大小

* @param boarder 边框宽度

*/

public static Bitmap getRoundBitmapByShader(Bitmap bitmap, int outWidth, int outHeight, int radius, int boarder) {

if (bitmap == null) {

return null;

}

int height = bitmap.getHeight();

int width = bitmap.getWidth();

float widthScale = outWidth * 1f / width;

float heightScale = outHeight * 1f / height;

Matrix matrix = new Matrix();

matrix.setScale(widthScale, heightScale);

//创建输出的bitmap

Bitmap desBitmap = Bitmap.createBitmap(outWidth, outHeight, Bitmap.Config.ARGB_8888);

//创建canvas并传入desBitmap，这样绘制的内容都会在desBitmap上

Canvas canvas = new Canvas(desBitmap);

Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);

//创建着色器

BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);

//给着色器配置matrix

bitmapShader.setLocalMatrix(matrix);

paint.setShader(bitmapShader);

//创建矩形区域并且预留出border

RectF rect = new RectF(boarder, boarder, outWidth - boarder, outHeight - boarder);

//把传入的bitmap绘制到圆角矩形区域内

canvas.drawRoundRect(rect, radius, radius, paint);

if (boarder > 0) {

//绘制boarder

Paint boarderPaint = new Paint(Paint.ANTI_ALIAS_FLAG);

boarderPaint.setColor(Color.GREEN);

boarderPaint.setStyle(Paint.Style.STROKE);

boarderPaint.setStrokeWidth(boarder);

canvas.drawRoundRect(rect, radius, radius, boarderPaint);

}

return desBitmap;

}

实现圆形和边框：

/**

* 通过BitmapShader实现圆形边框

* @param bitmap

* @param outWidth 输出的图片宽度

* @param outHeight 输出的图片高度

* @param boarder 边框大小

*/

public static Bitmap getCircleBitmapByShader(Bitmap bitmap, int outWidth, int outHeight, int boarder) {

int radius;

int width = bitmap.getWidth();

int height = bitmap.getHeight();

float widthScale = outWidth * 1f / width;

float heightScale = outHeight * 1f / height;

Bitmap desBitmap = Bitmap.createBitmap(outWidth, outHeight, Bitmap.Config.ARGB_8888);

if (outHeight > outWidth) {

radius = outWidth / 2;

} else {

radius = outHeight / 2;

}

//创建canvas

Canvas canvas = new Canvas(desBitmap);

Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);

BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);

Matrix matrix = new Matrix();

matrix.setScale(widthScale, heightScale);

bitmapShader.setLocalMatrix(matrix);

paint.setShader(bitmapShader);

canvas.drawCircle(outWidth / 2, outHeight / 2, radius - boarder, paint);

if (boarder > 0) {

//绘制boarder

Paint boarderPaint = new Paint(Paint.ANTI_ALIAS_FLAG);

boarderPaint.setColor(Color.GREEN);

boarderPaint.setStyle(Paint.Style.STROKE);

boarderPaint.setStrokeWidth(boarder);

canvas.drawCircle(outWidth / 2, outHeight / 2, radius - boarder, boarderPaint);

}

return desBitmap;

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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