最近遇到一个需求需要圆形listview作为悬浮窗，费了九牛二虎之力终于开发出来了，特别有成就感，下面分享下案例，项目原因，只能分享一部分供大家参考
1.有图有真相

下面就来讲解下代码：
1.自定义listview

import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Rect;import android.util.AttributeSet;import android.view.View;import android.view.ViewGroup;public class CircleListView extends ViewGroup { private static final double intervalAngel = 60;//子view之间的间隔角 int circleR;//圆的半径 int ccx;//圆心的x轴坐标 int ccy;//圆心的y轴坐标 double angel = 0;//偏移角度 private float oldTouchY;//上一次触摸的y轴位置 private boolean isScrolling = false;//是否在滑动状态 private Bitmap circleBitmap = null; private Rect src; private Rect dst; private Paint paint; private Adapter adapter = new Adapter(this) { @Override public View getView(int position) { return new View(getContext()); } }; public CircleListView(Context context) { super(context); setWillNotDraw(false); paint = new Paint(); } public CircleListView(Context context, AttributeSet attrs) { super(context, attrs); setWillNotDraw(false); paint = new Paint();// TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.CircleListView);// setCircleBitMap(ta.getResourceId(R.styleable.CircleListView_circleDrawable, 0));// ta.recycle(); } private void setCircleBitMap(int drawableId) { if (drawableId != 0) { circleBitmap = BitmapFactory.decodeResource(getResources(), drawableId); } else { circleBitmap = null; } } public void setAdapter(Adapter adapter) { this.adapter = adapter; refreshList(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { measureChildren(widthMeasureSpec, heightMeasureSpec); super.onMeasure(widthMeasureSpec, heightMeasureSpec); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if (circleBitmap != null) { if (src == null) { src = new Rect(); } src.left = 0; src.top = 0; src.right = circleBitmap.getWidth(); src.bottom = circleBitmap.getHeight(); if (dst == null) { dst = new Rect(); } dst.left = ccx - circleBitmap.getWidth()/4; dst.top = ccy - circleBitmap.getHeight()/4; dst.right = ccx + circleBitmap.getWidth()/4; dst.bottom = ccy + circleBitmap.getHeight()/4; canvas.drawBitmap(circleBitmap, src, dst, paint); } } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { circleR = (getRight() - getLeft()) / 10 * 5; ccy = (int) (getHeight() * 0.5); ccx = getWidth() / 2; for (int i = 0; i < adapter.getCount(); i++) { View childView = getChildAt(i); double childViewAngel = i * intervalAngel + angel; int x = ccx + (int) (Math.sin(Math.toRadians(childViewAngel)) * circleR*0.6); int y = ccy - (int) (Math.cos(Math.toRadians(childViewAngel)) * circleR*0.6); int vl = x - childView.getMeasuredWidth() / 2; int vt = y - childView.getMeasuredHeight() / 2; int vr = x + childView.getMeasuredWidth() / 2; int vb = y + childView.getMeasuredHeight() / 2; childView.layout(vl, vt, vr, vb ); } }// @Override// public boolean dispatchTouchEvent(MotionEvent ev) {// switch (ev.getAction()) {// case MotionEvent.ACTION_DOWN:// oldTouchY = ev.getY();// super.dispatchTouchEvent(ev);// return true;// case MotionEvent.ACTION_MOVE:// if (!isScrolling && Math.abs(oldTouchY - ev.getY()) > 50) {// isScrolling = true;// float offSetY = 0;// oldTouchY = ev.getY();// angel += offSetY / 20;// requestLayout();// return true;// } else if (isScrolling) {// float offSetY = ev.getY() - oldTouchY;// oldTouchY = ev.getY();// if ((angel + offSetY / 20) < ((adapter.getCount() - 1) * -intervalAngel)) {// angel = (adapter.getCount() - 1) * -intervalAngel;// } else if ((angel + offSetY / 20) > 0) {// angel = 0;// } else {// angel += offSetY / 20;// }// requestLayout();// return true;// }// return super.dispatchTouchEvent(ev);// case MotionEvent.ACTION_UP:// boolean notDispatch = isScrolling;// isScrolling = false;// if (notDispatch) {// return false;// } else {// performClick();// return super.dispatchTouchEvent(ev);// }// default:// isScrolling = false;// return super.dispatchTouchEvent(ev);// }// } protected void refreshList() { removeAllViews(); for (int i = 0; i < adapter.getCount(); i++) { if (i == 0 && angel < -intervalAngel * (adapter.getCount() - 1)) { angel = -intervalAngel * (adapter.getCount() - 1); } addView(adapter.getView(i)); if (adapter.getCount() == 1) { setPosition(0); } } invalidate(); } protected void setPosition(int position) { angel = -position * intervalAngel; }}

2.实体类

import android.graphics.drawable.Drawable;public class Files { private int id; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getApp_name() { return app_name; } public void setApp_name(String app_name) { this.app_name = app_name; } public String getPackagename() { return packagename; } public void setPackagename(String packagename) { this.packagename = packagename; } public int getImg_bg_id() { return img_bg_id; } public void setImg_bg_id(int img_bg_id) { this.img_bg_id = img_bg_id; } public boolean isShow() { return isShow; } public void setShow(boolean show) { isShow = show; } private Drawable imgDrawable; public Drawable getImgDrawable() { return imgDrawable; } public void setImgDrawable(Drawable imgDrawable) { this.imgDrawable = imgDrawable; } private boolean isShow; private String app_name; private String packagename; private int img_bg_id;}

3.适配器

import android.view.View;import java.util.ArrayList;public abstract class Adapter { private CircleListView circleListView; private ArrayList<Files> allAppList; public Adapter(CircleListView circleListView) { this.circleListView = circleListView; } public int getCount() { return allAppList.size(); } public abstract View getView(int position); public void notifyDataChanged() { circleListView.refreshList(); } public void setPosition(int position) { if (position > getCount() - 1) { position = getCount() - 1; } else if (position < 0) { position = 0; } circleListView.setPosition(position); }}

4.float.xml 引用：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView android:id="@+id/float_btn" android:layout_width="79px" android:layout_height="79px" android:scaleType="fitCenter" android:layout_centerInParent="true" android:background="@drawable/main_selector_floatbtn" android:clickable="true" /> <RelativeLayout android:id="@+id/float_area" android:layout_width="300px" android:layout_height="300px" android:layout_centerInParent="true" android:background="@drawable/float_display_bg" android:visibility="gone"> <com.xinrui.headsettest.circlelistview.CircleListView android:id="@+id/circle_list_view" android:layout_width="300px" android:layout_height="300px" android:layout_centerHorizontal="true"/> <ImageView android:id="@+id/float_main_img" android:layout_width="70px" android:layout_height="70px" android:scaleType="fitCenter" android:layout_centerInParent="true" android:background="@drawable/float_main_icon" android:clickable="true"/> </RelativeLayout></RelativeLayout>

5.Activity中应用：

import android.app.Activity;import android.os.Bundle;import android.provider.ContactsContract;import android.view.LayoutInflater;import android.view.View;import android.widget.ImageView;import android.widget.RelativeLayout;import android.widget.TextView;import android.widget.Toast;import com.xinrui.headsettest.circlelistview.Adapter;import com.xinrui.headsettest.circlelistview.CircleListView;import com.xinrui.headsettest.circlelistview.Files;import java.util.ArrayList;public class FloatActivity extends Activity implements View.OnClickListener{ private ImageView floatImg, float_main_img; private RelativeLayout float_area; private CircleListView circle_list_view; private Adapter adapter; private ArrayList<Files> appDataList; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.float_layout); getData(); init(); } private void getData(){ appDataList=new ArrayList<>(); Files files = new Files(); files.setApp_name(this.getResources().getString(R.string.calculator_txt)); files.setImg_bg_id(R.drawable.main_selector_calculator); appDataList.add(files); Files files0 = new Files(); files0.setApp_name(this.getResources().getString(R.string.calendar_txt)); files0.setImg_bg_id(R.drawable.main_selector_calendar); appDataList.add(files0); Files files1 = new Files(); files1.setApp_name(this.getResources().getString(R.string.timer_txt)); files1.setImg_bg_id(R.drawable.main_selector_clock); appDataList.add(files1); Files files2 = new Files(); files2.setApp_name(this.getResources().getString(R.string.vip_txt)); files2.setImg_bg_id(R.drawable.main_selector_vip); appDataList.add(files2); Files files3 = new Files(); files3.setApp_name(this.getResources().getString(R.string.screen_shots_txt)); files3.setImg_bg_id(R.drawable.main_selector_screenshot); appDataList.add(files3); Files files4 = new Files(); files4.setApp_name(this.getResources().getString(R.string.recording_screen_txt)); files4.setImg_bg_id(R.drawable.main_selector_recordingscreen); appDataList.add(files4); } private void init() { float_area = (RelativeLayout) findViewById(R.id.float_area); floatImg = (ImageView) findViewById(R.id.float_btn); float_main_img = (ImageView) findViewById(R.id.float_main_img); float_main_img.bringToFront(); floatImg.setOnClickListener(this); float_main_img.setOnClickListener(this); circle_list_view = findViewById(R.id.circle_list_view); adapter = new Adapter(circle_list_view) { @Override public View getView(final int position) { View view = LayoutInflater.from(FloatActivity.this).inflate(R.layout.item_app,null); TextView app_name = view.findViewById(R.id.app_name); ImageView app_img = view.findViewById(R.id.app_img); ImageView delete_img = view.findViewById(R.id.delete_icon); delete_img.bringToFront(); final Files files = appDataList.get(position); app_name.setText(files.getApp_name()); app_img.setImageResource(files.getImg_bg_id()); if(files.isShow()){ delete_img.setVisibility(View.VISIBLE); }else{ delete_img.setVisibility(View.INVISIBLE); } delete_img.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { appDataList.remove(position); Files file = new Files(); file.setShow(false); file.setImg_bg_id(R.drawable.main_selector_additem); file.setApp_name(FloatActivity.this.getResources().getString(R.string.custom_txt)); appDataList.add(position,file); adapter.notifyDataChanged(); } }); view.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(FloatActivity.this,"my is "+files.getApp_name(),Toast.LENGTH_SHORT).show(); } }); view.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View v) { if(!files.getApp_name().equals(FloatActivity.this.getResources().getString(R.string.custom_txt))) { for (Files file : appDataList) { if (file.getApp_name().equals(files.getApp_name())) { file.setShow(true); } else { file.setShow(false); } } adapter.notifyDataChanged(); } return true; } }); return view; } @Override public int getCount() { return appDataList.size(); } }; circle_list_view.setAdapter(adapter); adapter.setPosition(0); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.float_main_img: float_area.setVisibility(View.GONE); floatImg.setVisibility(View.VISIBLE); break; case R.id.float_btn: float_area.setVisibility(View.VISIBLE); floatImg.setVisibility(View.GONE); break; } }}

大功告成就这样实现了圆形listview…

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