android 圆形ListView实现，并附带圆角ImageView

转载请注明出处：王亟亟的大牛之路

平时 垂直向下的ListView已经司空见惯，换一种带一定角度的圆角ListView应该会给用户不同的体验

项目目录：

2个自定义View一个主Activity
MainActivity

public class MainActivity extends Activity {

    private ListView lv;
    //本地图片模拟数据源
    private int[] images = new int[] { R.drawable.p1, R.drawable.p2, R.drawable.p3 };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv = (ListView)findViewById(R.id.lv);
        lv.setAdapter(new MyAdapter(MakeData()));
        try {
            changeGroupFlag(lv);
        } catch (Exception e) {
            e.printStackTrace();
        }
        //翻滚的过程中不断绘制
        lv.setOnScrollListener(new OnScrollListener() {
            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
            }

            @Override
            public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
                for (int i = 0; i < lv.getChildCount(); i++) {
                    lv.getChildAt(i).invalidate();
                }
            }
        });
        //监听事件，测试是否会出现item移位
        lv.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                Toast.makeText(MainActivity.this,"第"+position+"个被按到了", Toast.LENGTH_SHORT).show();
            }
        });
    }
    //自定义适配器
    class MyAdapter extends BaseAdapter {

        public final class ViewHolder{
        public ImageView imageView;
        public TextView text;
        }
        //传入的数据源
        private List<String> data;

        public MyAdapter(List<String> data){
            this.data=data;
        }

        @Override
        public int getCount() {
            return data.size();
        }

        @Override
        public Object getItem(int position) {
            return null;
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
             ViewHolder holder = null;
             if (convertView == null) {
                holder=new ViewHolder(); 
                MatrixView m = (MatrixView)LayoutInflater.from(MainActivity.this).inflate(R.layout.view_list_item, null);
                m.setParentHeight(lv.getHeight());
                convertView = m;
                holder.text=(TextView)convertView.findViewById(R.id.text);
                holder.imageView = (ImageView)convertView.findViewById(R.id.image);
                convertView.setTag(holder);
              }else {
                 holder = (ViewHolder)convertView.getTag();
              }
             holder.text.setText(data.get(position)+"");
             holder.imageView.setImageResource(images[position % images.length]);          
            return convertView;
        }

    }

    public void changeGroupFlag(Object obj) throws Exception// 反射替换对所有String进行替换
    {
        Field[] f = obj.getClass().getSuperclass().getSuperclass().getSuperclass().getDeclaredFields(); // 获得成员映射数组
        for (Field tem : f) // 迭代for循环
        {
            if (tem.getName().equals("mGroupFlags")) {
                tem.setAccessible(true);
                Integer mGroupFlags = (Integer)tem.get(obj); // 返回内容
                int newGroupFlags = mGroupFlags & 0xfffff8;
                tem.set(obj, newGroupFlags);// 替换成员值
            }
        }
    }

    private List<String> MakeData(){
        List<String> data=new ArrayList<String>();
        for(int k=0;k<100;k++){
            data.add("麦麦你好 "+k);
        }
        return data;
    }
}

自定义圆角图片

public class RoundImageView extends ImageView {

    private float xRadius = 10;
    private float yRadius = 10;
    private Paint paint = new Paint();

    public RoundImageView(Context context) {
        super(context);
    }

    public RoundImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public float getxRadius() {
        return xRadius;
    }

    public void setxRadius(float xRadius) {
        this.xRadius = xRadius;
    }

    public float getyRadius() {
        return yRadius;
    }

    public void setyRadius(float yRadius) {
        this.yRadius = yRadius;
    }

    @SuppressWarnings("deprecation")
    @Override
    protected void onDraw(Canvas canvas) {
        // java.lang.ClassCastException: android.graphics.drawable.TransitionDrawable cannot be cast
        // to android.graphics.drawable.BitmapDrawable
        BitmapShader shader;
        if (getDrawable() instanceof BitmapDrawable) {
            BitmapDrawable bitmapDrawable = (BitmapDrawable)getDrawable();
            // clip
            shader = new BitmapShader(bitmapDrawable.getBitmap(), Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
            RectF rect = new RectF(0.0f, 0.0f, getWidth(), getHeight());
            int width = bitmapDrawable.getBitmap().getWidth();
            int height = bitmapDrawable.getBitmap().getHeight();
            RectF src = null;
            if (((float)width) / height > 1) {
                src = new RectF(0.0f, 0.0f, height, height);
            } else {
                src = new RectF(0.0f, 0.0f, width, width);
            }
            Matrix matrix = canvas.getMatrix();
            matrix.setRectToRect(src, rect, Matrix.ScaleToFit.CENTER);
            shader.setLocalMatrix(matrix);

            // 抗锯齿
            paint.setAntiAlias(true);
            paint.setShader(shader);
            // draw round circle for HeadImage or other
            canvas.drawRoundRect(rect, this.getWidth() / 2, this.getHeight() / 2, paint);
            // canvas.drawRoundRect(rect, xRadius, yRadius / 2, paint);
        }
    }
}

自定义布局

public class MatrixView extends LinearLayout {
    private int h = 0;
    private float fullAngelFactor = 10f;
    private float fullScaleFactor=1;
    public MatrixView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public void setParentHeight(int height) {
        h = height;
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        canvas.save();
        int top = getTop();

        float rotate = calculateAngel(top, h);
        float scale = calcuylateScale(top, h);

        Matrix m = canvas.getMatrix();
        m.preTranslate(-2 / getWidth(), -2 / getHeight());
        m.postScale(scale, scale);
        m.postTranslate(2 / getWidth(), 2 / getHeight());
        m.postRotate(rotate);
        canvas.concat(m);
        super.dispatchDraw(canvas);
        canvas.restore();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    private float calculateAngel(int top, int h) {
        float result = 0f;
        if (top < h / 2f) {
            result = (top - (h / 2f)) / (h / 2f) * fullAngelFactor;
        } else if (top > h / 2f) {
            result = (top - (h / 2f)) / (h / 2f) * fullAngelFactor;
        }
        return result;
    }

    private float calcuylateScale(int top, int h) {
        float result = 0f;

        result = (1f - 1f/2f*Math.abs((top - h / 2f)) / (h / 2f)) * fullScaleFactor;
        return result;

    }
}

private float fullAngelFactor 为旋转的角度
private float fullScaleFactor 为试图放大缩小的比例

private float fullAngelFactor=40f时：

主布局就补贴了，就是一个ListView

每一个Item

<?xml version="1.0" encoding="utf-8"?>
<com.wjj.test.MatrixView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <com.wjj.test.RoundImageView
        android:id="@+id/image"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_marginLeft="30dp"
        android:scaleType="centerCrop" />

    <TextView
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:gravity="left|center_vertical"
        android:paddingLeft="20dp"
        android:textSize="18sp" />

</com.wjj.test.MatrixView>

具体实现可以看代码，附上源码下载地址：http://yunpan.cn/cmy9fi3fMDY7U 访问密码 0982

部分代码来源于互联网，如有重复请见谅