import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Path;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.util.Log;

import androidx.annotation.Nullable;
import androidx.appcompat.widget.AppCompatImageView;

public class RoundImageView extends AppCompatImageView {
    private static final String TAG = "RoundImageView";

    private int radius = 0;

    public RoundImageView(Context context) {
        this(context, null);
    }

    public RoundImageView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public RoundImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        setup(context, attrs, defStyleAttr);
    }

    private void setup(Context context, AttributeSet attrs, int defStyleAttr) {
        try {
            TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RoundImageView);
            radius = a.getDimensionPixelSize(R.styleable.RoundImageView_riv_radius, 0);
            Log.d(TAG, "RoundImageView: radius=" + radius);
            a.recycle();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void setRadius(int radius) {
        this.radius = radius;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        if (radius > 0) {
            Path path = new Path();
            path.addRoundRect(new RectF(0, 0, getWidth(), getHeight()), radius, radius, Path.Direction.CW);
            canvas.clipPath(path);//设置可显示的区域，canvas四个角会被剪裁掉
        }
        super.onDraw(canvas);
    }
}

D:\_dev\_code\as\Test> gradlew -v       # 查看版本
D:\_dev\_code\as\Test> gradlew --help   # 查看命令使用帮助

D:\_dev\_code\as\Test> where gradlew    # 查看 gradlew 命令位置
D:\_dev\_code\as\Test\gradlew
D:\_dev\_code\as\Test\gradlew.bat

val intent = Intent()
intent.data = Uri.parse(url)
intent.action = Intent.ACTION_VIEW
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
context.startActivity(intent)

try {
    val intent = Intent()
    intent.data = Uri.parse(targetUrl)
    intent.action = Intent.ACTION_VIEW
    intent.setClassName(
        "com.android.browser",
        "com.android.browser.BrowserActivity"
    ) 
    intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
    context.startActivity(intent)
} catch (e: Exception) {
    e.printStackTrace()

    // android.content.ActivityNotFoundException: Unable to find explicit activity class {com.android.browser/com.android.browser.BrowserActivity}; have you declared this activity in your AndroidManifest.xml?
    val intent = Intent()
    intent.data = Uri.parse(url)
    intent.action = Intent.ACTION_VIEW
    intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
    context.startActivity(intent)
}

binding.recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
    override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
        super.onScrolled(recyclerView, dx, dy)
        onRecyclerScrolled(recyclerView, dx, dy)
    }

    override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
        super.onScrollStateChanged(recyclerView, newState)
    }
})

private val dp180 = dp2px(180)
private var distanceY = 0
private var current = 0
private fun onRecyclerScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
    distanceY += dy
    when {
        distanceY >= dp180 -> {
            if (current == 1) return
            recyclerView.setBackgroundColor(Color.argb(255, 246, 248, 250))
            current = 1
        }
        distanceY <= 0 -> {
            if (current == 0) return
            recyclerView.setBackgroundColor(Color.argb(0, 246, 248, 250))
            current = 0
        }
        else -> {
            recyclerView.setBackgroundColor(
                Color.argb(
                    distanceY * 255 / dp180,
                    246, 248, 250
                )
            )
            current = -1
        }
    }
}