在Android中,ImageView默认是一个矩形。如何使它成为一个圆角矩形(剪辑我的位图的所有4个角为圆角矩形)在ImageView?
请注意,从2021年起,只需使用ShapeableImageView
在Android中,ImageView默认是一个矩形。如何使它成为一个圆角矩形(剪辑我的位图的所有4个角为圆角矩形)在ImageView?
请注意,从2021年起,只需使用ShapeableImageView
当前回答
它可以用ShapeableImageView使用ShapeAppearanceOverlay完成:
<com.google.android.material.imageview.ShapeableImageView
android:id="@+id/avatar"
android:layout_width="64dp"
android:layout_height="64dp"
android:padding="4dp"
app:shapeAppearance="@style/ShapeAppearanceOverlay.Avatar"/>
其中样式为ShapeAppearanceOverlay。Avatar驻留在res/values/styles.xml中:
<style name="ShapeAppearanceOverlay.Avatar" parent="ShapeAppearance.MaterialComponents.SmallComponent">
<item name="cornerFamily">rounded</item>
<item name="cornerSize">50%</item>
</style>
这只需要相等的layout_height和layout_width设置,否则将是一个药丸和没有圆。
其他回答
使用这个得到圆形图像与边界
public static Bitmap getCircularBitmapWithBorder(Bitmap bitmap, int bordercolor) {
if (bitmap == null || bitmap.isRecycled()) {
return null;
}
int borderWidth=(int)(bitmap.getWidth()/40);
final int width = bitmap.getWidth() + borderWidth;
final int height = bitmap.getHeight() + borderWidth;
Bitmap canvasBitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
BitmapShader shader = new BitmapShader(bitmap, TileMode.CLAMP,
TileMode.CLAMP);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setShader(shader);
Canvas canvas = new Canvas(canvasBitmap);
float radius = width > height ? ((float) height) / 2f
: ((float) width) / 2f;
canvas.drawCircle(width / 2, height / 2, radius, paint);
paint.setShader(null);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(bordercolor);
paint.setStrokeWidth(borderWidth);
canvas.drawCircle(width / 2, height / 2, radius - borderWidth / 2,
paint);
return canvasBitmap;
}
如果你们中有人面临这个问题
大多数情况下,你使用的是Android Studio。由于图像大小的调整和所有在Android工作室,你可能会遇到这个问题。解决这个问题的一个简单方法是减小drawCircle()中的圆的半径。在我的情况下,我使用这个修复
使用画布。drawCircle(100,100,90, paint);而不是帆布。drawCircle(100,100,100, paint);这绝对能解决你的问题。
下面是最终编辑的代码:-
public class Profile extends ActionBarActivity {
TextView username;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.profile);
username= (TextView) findViewById(R.id.txt);
String recievedusername=getIntent().getExtras().getString("toname");
username.setText(recievedusername);
Bitmap bm = BitmapFactory.decodeResource(getResources(),
R.mipmap.gomez);
Bitmap resizedBitmap = Bitmap.createScaledBitmap(bm, 200,200, false);
Bitmap conv_bm=getCircleBitmap(resizedBitmap,100);
// set circle bitmap
ImageView mImage = (ImageView) findViewById(R.id.profile_image);
mImage.setImageBitmap(conv_bm);
// TODO Auto-generated method stub
}
private Bitmap getCircleBitmap(Bitmap bitmap , int pixels) {
final Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
bitmap.getHeight(), Bitmap.Config.ARGB_8888);
final Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(),bitmap.getHeight());
final RectF rectF = new RectF(rect);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawCircle(100,100, 90, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
bitmap.recycle();
return output;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_apploud, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_addnew) {
Intent i;
i=new Intent(Profile.this,ApplaudSomeone.class);
startActivity(i);
return true;
}
return super.onOptionsItemSelected(item);
}
}
我建议在这种情况下使用Coil库
Coil是Kotlin-first,使用现代库,包括Coroutines, OkHttp, Okio和AndroidX Lifecycles。
github链接
试试这个
Bitmap finalBitmap;
if (bitmap.getWidth() != radius || bitmap.getHeight() != radius)
finalBitmap = Bitmap.createScaledBitmap(bitmap, radius, radius,
false);
else
finalBitmap = bitmap;
Bitmap output = Bitmap.createBitmap(finalBitmap.getWidth(),
finalBitmap.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, finalBitmap.getWidth(),
finalBitmap.getHeight());
paint.setAntiAlias(true);
paint.setFilterBitmap(true);
paint.setDither(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(Color.parseColor("#BAB399"));
canvas.drawCircle(finalBitmap.getWidth() / 2 + 0.7f,
finalBitmap.getHeight() / 2 + 0.7f,
finalBitmap.getWidth() / 2 + 0.1f, paint);
paint.setXfermode(new PorterDuffXfermode(
android.graphics.PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(finalBitmap, rect, rect, paint);
return output;
/**
* Background Async task to load user profile picture from url
*/
private class LoadProfileImage extends AsyncTask<String, Void, RoundedBitmapDrawable> {
ImageView profileImageView;
public LoadProfileImage(ImageView profileImageView) {
this.profileImageView = profileImageView;
}
protected RoundedBitmapDrawable doInBackground(String... urls) {
String photoUrl = urls[0];
RoundedBitmapDrawable profileRoundedDrawable = null;
try {
InputStream inputStream = new java.net.URL(photoUrl).openStream();
Resources res = getResources();
profileRoundedDrawable = RoundedBitmapDrawableFactory.create(res, inputStream);
profileRoundedDrawable.setCircular(true);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return profileRoundedDrawable;
}
protected void onPostExecute(RoundedBitmapDrawable result) {
profileImageView.setImageDrawable(result);
}
}