核心ViewHelper，使用ViewOutlineProvider实现圆角
ViewHelper.java
import android.annotation.TargetApi;
import android.content.res.TypedArray;
import android.graphics.Outline;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewOutlineProvider;
public class ViewHelper {
public static final int RADIUS_ALL = 0;
public static final int RADIUS_LEFT = 1;
public static final int RADIUS_TOP = 2;
public static final int RADIUS_RIGHT = 3;
public static final int RADIUS_BOTTOM = 4;
public static void setViewOutline(View view, AttributeSet attributes, int defStyleAttr, int defStyleRes) {
TypedArray array = view.getContext().obtainStyledAttributes(attributes, R.styleable.viewOutLineStrategy, defStyleAttr, defStyleRes);
int radius = array.getDimensionPixelSize(R.styleable.viewOutLineStrategy_clip_radius, 0);
int hideSide = array.getInt(R.styleable.viewOutLineStrategy_clip_side, 0);
array.recycle();
setViewOutline(view, radius, hideSide);
}
public static void setViewOutline(View owner, final int radius, final int radiusSide) {
owner.setOutlineProvider(new ViewOutlineProvider() {
@Override
@TargetApi(21)
public void getOutline(View view, Outline outline) {
int w = view.getWidth(), h = view.getHeight();
if (w == 0 || h == 0) {
return;
}
if (radiusSide != RADIUS_ALL) {
int left = 0, top = 0, right = w, bottom = h;
if (radiusSide == RADIUS_LEFT) {
right += radius;
} else if (radiusSide == RADIUS_TOP) {
bottom += radius;
} else if (radiusSide == RADIUS_RIGHT) {
left -= radius;
} else if (radiusSide == RADIUS_BOTTOM) {
top -= radius;
}
outline.setRoundRect(left, top, right, bottom, radius);
return;
}
int top = 0, bottom = h, left = 0, right = w;
if (radius <= 0) {
outline.setRect(left, top, right, bottom);
} else {
outline.setRoundRect(left, top, right, bottom, radius);
}
}
});
//开启剪裁
owner.setClipToOutline(radius > 0);
owner.invalidate();
}
}
CornerFrameLayout
import android.content.Context;
import android.util.AttributeSet;
import android.widget.FrameLayout;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
public class CornerFrameLayout extends FrameLayout {
public CornerFrameLayout(@NonNull Context context) {
this(context, null);
}
public CornerFrameLayout(@NonNull Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public CornerFrameLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public CornerFrameLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
ViewHelper.setViewOutline(this, attrs, defStyleAttr, defStyleRes);
}
public void setViewOutline(int radius, int radiusSide) {
ViewHelper.setViewOutline(this, radius, radiusSide);
}
}
CornerLinearLayout
import android.content.Context;
import android.util.AttributeSet;
import android.widget.LinearLayout;
import androidx.annotation.Nullable;
public class CornerLinearLayout extends LinearLayout {
public CornerLinearLayout(Context context) {
this(context, null);
}
public CornerLinearLayout(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public CornerLinearLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public CornerLinearLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
ViewHelper.setViewOutline(this, attrs, defStyleAttr, defStyleRes);
}
}
来源：oschina
链接：/u/4261498/blog/4314342
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