android 圆形ListView实现，并附带圆角ImageView

圆形ListView实现，并附带圆角ImageView"/>

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 };@Overrideprotected 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() {@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {}@Overridepublic 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() {@Overridepublic 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;}@Overridepublic int getCount() {return data.size();}@Overridepublic Object getItem(int position) {return null;}@Overridepublic long getItemId(int position) {return 0;}@Overridepublic 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")@Overrideprotected void onDraw(Canvas canvas) {// java.lang.ClassCastException: android.graphics.drawable.TransitionDrawable cannot be cast// to android.graphics.drawable.BitmapDrawableBitmapShader shader;if (getDrawable() instanceof BitmapDrawable) {BitmapDrawable bitmapDrawable = (BitmapDrawable)getDrawable();// clipshader = 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 othercanvas.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;}@Overrideprotected 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();}@Overrideprotected 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=""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： 访问密码 0982

部分代码来源于互联网，如有重复请见谅