Android自定义ImageView实现圆角功能

<?xml version="1.0" encoding="utf-8"?><resources>  <declare-styleable name="RoundCornerImageView">    <attr name="radius" format="dimension" />    <attr name="left_top_radius" format="dimension" />    <attr name="right_top_radius" format="dimension" />    <attr name="right_bottom_radius" format="dimension" />    <attr name="left_bottom_radius" format="dimension" />  </declare-styleable></resources>

public class RoundCornerImageView extends AppCompatImageView {  private float width, height;  private int defaultRadius = 0;  private int radius;  private int leftTopRadius;  private int rightTopRadius;  private int rightBottomRadius;  private int leftBottomRadius;  public RoundCornerImageView(Context context) {    this(context, null);    init(context, null);  }  public RoundCornerImageView(Context context, AttributeSet attrs) {    this(context, attrs, 0);    init(context, attrs);  }  public RoundCornerImageView(Context context, AttributeSet attrs, int defStyleAttr) {    super(context, attrs, defStyleAttr);    init(context, attrs);  }  private void init(Context context, AttributeSet attrs) {    if (Build.VERSION.SDK_INT < 18) {      setLayerType(View.LAYER_TYPE_SOFTWARE, null);    }    // 读取配置    TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.RoundCornerImageView);    radius = array.getDimensionPixelOffset(R.styleable.RoundCornerImageView_radius, defaultRadius);    leftTopRadius = array.getDimensionPixelOffset(R.styleable.RoundCornerImageView_left_top_radius, defaultRadius);    rightTopRadius = array.getDimensionPixelOffset(R.styleable.RoundCornerImageView_right_top_radius, defaultRadius);    rightBottomRadius = array.getDimensionPixelOffset(R.styleable.RoundCornerImageView_right_bottom_radius, defaultRadius);    leftBottomRadius = array.getDimensionPixelOffset(R.styleable.RoundCornerImageView_left_bottom_radius, defaultRadius);    //如果四个角的值没有设置，那么就使用通用的radius的值。    if (defaultRadius == leftTopRadius) {      leftTopRadius = radius;    }    if (defaultRadius == rightTopRadius) {      rightTopRadius = radius;    }    if (defaultRadius == rightBottomRadius) {      rightBottomRadius = radius;    }    if (defaultRadius == leftBottomRadius) {      leftBottomRadius = radius;    }    array.recycle();  }  @Override  protected void onLayout(boolean changed, int left, int top, int right, int bottom) {    super.onLayout(changed, left, top, right, bottom);    width = getWidth();    height = getHeight();  }  @Override  protected void onDraw(Canvas canvas) {    //这里做下判断，只有图片的宽高大于设置的圆角距离的时候才进行裁剪    int maxLeft = Math.max(leftTopRadius, leftBottomRadius);    int maxRight = Math.max(rightTopRadius, rightBottomRadius);    int minWidth = maxLeft + maxRight;    int maxTop = Math.max(leftTopRadius, rightTopRadius);    int maxBottom = Math.max(leftBottomRadius, rightBottomRadius);    int minHeight = maxTop + maxBottom;    if (width >= minWidth && height > minHeight) {      Path path = new Path();      //四个角：右上，右下，左下，左上      path.moveTo(leftTopRadius, 0);      path.lineTo(width - rightTopRadius, 0);      path.quadTo(width, 0, width, rightTopRadius);      path.lineTo(width, height - rightBottomRadius);      path.quadTo(width, height, width - rightBottomRadius, height);      path.lineTo(leftBottomRadius, height);      path.quadTo(0, height, 0, height - leftBottomRadius);      path.lineTo(0, leftTopRadius);      path.quadTo(0, 0, leftTopRadius, 0);      canvas.clipPath(path);    }    super.onDraw(canvas);  }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:app="http://schemas.android.com/apk/res-auto"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical"  tools:context="voicedemo.iflytek.com.roundimage.MainActivity">  <voicedemo.iflytek.com.roundimage.RoundCornerImageView    android:id="@+id/iv_avatar"    android:layout_width="100dp"    android:layout_height="100dp"    android:layout_marginBottom="10dp"    android:layout_marginTop="50dp"    android:scaleType="centerCrop"    app:left_top_radius="20dp"    app:right_top_radius="20dp"    /></LinearLayout>

public class MainActivity extends AppCompatActivity {  String avatarUrl = "19e9d4c0a8f1cd033ecac3692_th.jpg";  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    ImageView ivAvatar = findViewById(R.id.iv_avatar);    Glide.with(this).load(avatarUrl).into(ivAvatar);  }}