Android通用圆角布局，可以解决Android P版本xfermode方案裁剪黑边问题和xfermode在列表view中使用滑动时EGL内存泄露问题
- 1、之前使用的XferMode裁剪方案在P版本失效
- 2、xfermode圆角裁剪方案在RecyclerView中使用，滑动时会出现EGL内存泄露问题（系统api未做好内存回收），使用GeneralRound，可以解决L版本上的机器
- 3、希望可以快速将一个View装饰包装变成支持裁剪圆角的View
- 4、不希望关闭硬件加速去绘制圆角，不希望使用有锯齿的clipPath API
- 1、在Project 的build.gradle中
allprojects {
repositories {
...
maven { url 'https://jitpack.io' }
}
}
- 2、在对应module中添加dependency
dependencies {
implementation 'com.github.minminaya:GenaralRoundLayout:1.0.0'
}
- 3、在你想做裁剪的布局外层包裹
<com.minminaya.widget.GeneralRoundFrameLayout
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_gravity="center"
app:corner_radius="30dp">
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorAccent" />
</com.minminaya.widget.GeneralRoundFrameLayout>
GeneralRoundLayout设计初期是为了方便各种布局的扩展，因此可以使任何一个view支持圆角特性，你只需要重写几个方法
- 1、让你的自定义view比如GeneralRoundImageView实现IRoundView接口
interface IRoundView {
fun setCornerRadius(cornerRadius: Float)
fun onLayout(changed: Boolean, left: Int, top: Int, right: Int, bottom: Int)
}
- 2、定义attrs属性
在你的attrs的文件中，定义declare-styleable属性（为了可以在xml文件中输入的时候自动提示）
<declare-styleable name="GeneralRoundImageView">
<attr name="corner_radius" />
</declare-styleable>
- 2、让GeneralRoundImageView实现IRoundView接口的方法
public class GeneralRoundImageView extends AppCompatImageView implements IRoundView {
public GeneralRoundImageView(Context context) {
this(context, null);
}
public GeneralRoundImageView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public GeneralRoundImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
public void setCornerRadius(float cornerRadius) {
}
@Override
public void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
}
}
- 3、在GeneralRoundImageView中定义GeneralRoundViewImpl对象，本质上是裁剪view的helper类，让其初始化，并将view的实现分发到GeneralRoundViewImpl
public class GeneralRoundImageView extends AppCompatImageView implements IRoundView {
private GeneralRoundViewImpl generalRoundViewImpl;
public GeneralRoundImageView(Context context) {
this(context, null);
}
public GeneralRoundImageView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init(this, context, attrs);
}
public GeneralRoundImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(this, context, attrs);
}
@Override
public void setCornerRadius(float cornerRadius) {
generalRoundViewImpl.setCornerRadius(cornerRadius);
}
@Override
public void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
generalRoundViewImpl.onLayout(changed, left, top, right, bottom);
}
private void init(GeneralRoundImageView view, Context context, AttributeSet attrs) {
generalRoundViewImpl = new GeneralRoundViewImpl(view,
context,
attrs,
R.styleable.GeneralRoundImageView,
R.styleable.GeneralRoundImageView_corner_radius);
}
}
- 4、重写dispatchDraw方法，将实现类的方法包装super
@Override
protected void dispatchDraw(Canvas canvas) {
generalRoundViewImpl.beforeDispatchDraw(canvas);
super.dispatchDraw(canvas);
generalRoundViewImpl.afterDispatchDraw(canvas);
}
- 5、在你要使用的地方
<com.minminaya.genaral.custom.GeneralRoundImageView
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_gravity="center"
android:layout_marginTop="20dp"
android:src="@color/colorPrimaryDark"
app:corner_radius="60dp" />
- 6、done
- 1、P版本圆角失效问题，具体可见GcsSloop大神的rclayout，有给出为何失效和解决的方案
- 2、由于xfermode方案会导致内存泄露，所以这里GeneralRoundLayout在L版本及以上不在使用其进行绘制，转而使用ViewOutlineProvider去进行圆角裁剪，当然，4.3和4.4泄露问题不能够解决，基于现在的18、19和20版本的是用户量，决定保证L版本以上不泄露即可
- 3、为了兼容18、19和20的圆角可以生效，GeneralRoundViewImpl内部会进行版本去选择RoundViewPolicy
具体可以参考GeneralRoundView21Policy类实现，其实本质上只有几行代码，但是为了写的优雅嘛啊哈，你懂的
- 1、在你自定义view的dispatchDraw方法中直接使用ViewOutlineProvider
@Override
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(canvas);
setClipToOutline(true);
setOutlineProvider(new ViewOutlineProvider() {
@Override
public void getOutline(View view, Outline outline) {
outline.setRoundRect(0, 0, mContainer.width, mContainer.height, mCornerRadius);
}
});
}
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