把头像设置成圆形的代码如下：
1 package com.example.lesson6_11_id19;
2
3 import android.content.Context;
4 import android.content.res.TypedArray;
5 import android.graphics.Bitmap;
6 import android.graphics.Canvas;
7 import android.graphics.Color;
8 import android.graphics.Paint;
9 import android.graphics.PorterDuff;
10 import android.graphics.PorterDuffXfermode;
11 import android.graphics.RectF;
12 import android.graphics.Xfermode;
13 import android.graphics.drawable.Drawable;
14 import android.graphics.drawable.NinePatchDrawable;
15 import android.util.AttributeSet;
16 import android.widget.ImageView;
17
18 public class CircleImageView extends ImageView {
19 private static final Xfermode MASK_XFERMODE;
20 private Bitmap mask;
21 private Paint paint;
22 private int mBorderWidth = 10;
23 private int mBorderColor = Color.parseColor("#f2f2f2");
24 private boolean useDefaultStyle = false;
25
26 static {
27 PorterDuff.Mode localMode = PorterDuff.Mode.DST_IN;
28 MASK_XFERMODE = new PorterDuffXfermode(localMode);
29 }
30
31 public CircleImageView(Context context) {
32 super(context);
33 }
34
35 public CircleImageView(Context context, AttributeSet attrs) {
36 this(context, attrs, 0);
37 }
38
39 public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
40 super(context, attrs, defStyle);
41 TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircularImage);
42 mBorderColor = a.getColor(R.styleable.CircularImage_border_color, mBorderColor);
43 final int def = (int) (2*context.getResources().getDisplayMetrics().density + 0.5f);
44 mBorderWidth = a.getDimensionPixelOffset(R.styleable.CircularImage_border_width, def);
45 a.recycle();
46 }
47
48 private void useDefaultStyle(boolean useDefaultStyle) {
49 this.useDefaultStyle = useDefaultStyle;
50 }
51
52 @Override
53 protected void onDraw(Canvas canvas) {
54 if(useDefaultStyle) {
55 super.onDraw(canvas);
56 return ;
57 }
58 final Drawable localDraw = getDrawable();
59 if(localDraw == null) {
60 return ;
61 }
62 if(localDraw instanceof NinePatchDrawable) {
63 return ;
64 }
65 if (this.paint == null) {
66 final Paint localPaint = new Paint();
67 localPaint.setFilterBitmap(false);
68 localPaint.setAntiAlias(true);
69 localPaint.setXfermode(MASK_XFERMODE);
70 this.paint = localPaint;
71 }
72 final int width = getWidth();
73 final int height = getHeight();
74 /** ????layer */
75 int layer = canvas.saveLayer(0.0F, 0.0F, width, height, null, 31);
76 /** ????drawable???С */
77 localDraw.setBounds(0, 0, width, height);
78 /** ??drawable????bitmap(this.mask)???棨drawable??????bitmap????????? */
79 localDraw.draw(canvas);
80 if ((this.mask == null) || (this.mask.isRecycled())) {
81 this.mask = createOvalBitmap(width, height);
82 }
83 /** ??bitmap????canvas???? */
84 canvas.drawBitmap(this.mask, 0.0F, 0.0F, this.paint);
85 /** ???????????layer?? */
86 canvas.restoreToCount(layer);
87 drawBorder(canvas, width, height);
88 }
89
90 /**
91 * ??????α??
92 */
93 private void drawBorder(Canvas canvas, final int width, final int height) {
94 if(mBorderWidth == 0) {
95 return ;
96 }
97 final Paint mBorderPaint = new Paint();
98 mBorderPaint.setStyle(Paint.Style.STROKE);
99 mBorderPaint.setAntiAlias(true);
100 mBorderPaint.setColor(mBorderColor);
101 mBorderPaint.setStrokeWidth(mBorderWidth);
102 canvas.drawCircle(width/2, height/2, (width-mBorderWidth)/2, mBorderPaint);
103 canvas = null;
104 }
105
106 public Bitmap createOvalBitmap(final int width, final int height) {
107 Bitmap.Config localConfig = Bitmap.Config.ARGB_8888;
108 Bitmap localBitmap = Bitmap.createBitmap(width, height, localConfig);
109 Canvas localCanvas = new Canvas(localBitmap);
110 Paint localPaint = new Paint();
111 final int padding = (mBorderWidth - 3) > 0 ? mBorderWidth - 3 : 1;
112 /**
113 * ??????????С(???????????????border???????????????????????????????п?????????Ч??????????????????????
114 * ????????padding px)
115 */
116 RectF localRectF = new RectF(padding, padding, width - padding, height - padding);
117 localCanvas.drawOval(localRectF, localPaint);
118
119 return localBitmap;
120 }
121
122 }
把下面的xml创建到values下，再把child_xml的ImageView改成java上面java代码所对应的包名：
1 <?xml version="1.0" encoding="utf-8"?> 2 <resources> 3 4 <declare-styleable name="CircularImage"> 5 <attr name="border_width" format="dimension" /> 6 <attr name="border_color" format="color" /> 7 </declare-styleable> 8 9 </resources>
下面的就是功能代码：
activity_xml:
1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 xmlns:tools="http://schemas.android.com/tools" 3 android:layout_width="match_parent" 4 android:layout_height="match_parent" 5 android:background="#c7edcc" 6 tools:context="com.example.lesson6_11_id19.MainActivity" > 7 8 <ExpandableListView 9 android:id="@+id/elv" 10 android:layout_width="match_parent" 11 android:layout_height="match_parent" > 12 </ExpandableListView> 13 </RelativeLayout>
item_group.xml:
1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 android:layout_width="match_parent" 3 android:layout_height="match_parent" 4 android:padding="10dp" 5 android:background="#c7edcc" > 6 7 <TextView 8 android:id="@+id/tv_groupName" 9 android:layout_width="wrap_content" 10 android:layout_height="wrap_content" 11 android:text="组名" 12 android:textSize="20sp"/> 13 14 <TextView 15 android:id="@+id/tv_numble" 16 android:layout_width="wrap_content" 17 android:layout_height="wrap_content" 18 android:layout_alignParentRight="true" 19 android:text="1/10" 20 android:textSize="20dp"/> 21 22 </RelativeLayout>
item_child.xml:
1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 android:layout_width="match_parent" 3 android:layout_height="wrap_content" 4 android:orientation="horizontal" 5 android:background="#c7edcc"> 6 7 <com.example.lesson6_11_id19.CircleImageView 8 android:id="@+id/iv_pic" 9 android:layout_width="80dp" 10 android:layout_height="80dp" 11 android:padding="5dp" 12 /> 13 14 <LinearLayout 15 android:layout_width="match_parent" 16 android:layout_height="match_parent" 17 android:orientation="vertical" 18 android:padding="5dp"> 19 20 <TextView 21 android:id="@+id/tv_name" 22 android:layout_width="wrap_content" 23 android:layout_height="0dp" 24 android:layout_weight="1" 25 android:text="昵称" 26 android:gravity="center"/> 27 28 <TextView 29 android:id="@+id/tv_online" 30 android:layout_width="wrap_content" 31 android:layout_height="0dp" 32 android:layout_weight="1" 33 android:gravity="center" 34 android:text="在线"/> 35 36 </LinearLayout> 37 38 </LinearLayout>
java代码：
1 package com.example.lesson6_11_id19;
2
3 import java.util.ArrayList;
4 import java.util.List;
5
6 import com.example.lesson6_11_id19.UserGroup.User;
7
8 import android.app.Activity;
9 import android.os.Bundle;
10 import android.widget.ExpandableListView;
11
12 public class MainActivity extends Activity {
13 ExpandableListView elv;
14 List<UserGroup> mlist = new ArrayList<UserGroup>();
15 @Override
16 protected void onCreate(Bundle savedInstanceState) {
17 super.onCreate(savedInstanceState);
18 setContentView(R.layout.activity_main);
19 elv = (ExpandableListView) findViewById(R.id.elv);
20 initData();
21 elv.setAdapter(new MyAdapter(this, mlist));
22 elv.setGroupIndicator(null);
23 }
24 private void initData() {
25 List<User> list_1 = new ArrayList<UserGroup.User>();
26 list_1.add(new User(R.drawable.zhaoliying, "赵丽颖", true));
27 list_1.add(new User(R.drawable.gaoyuanyuan, "高圆圆", true));
28 list_1.add(new User(R.drawable.songhuiqiao, "宋慧乔", false));
29 list_1.add(new User(R.drawable.yangmi, "赵丽颖", true));
30 UserGroup user_1 = new UserGroup("女神", list_1);
31 List<User> list_2 = new ArrayList<UserGroup.User>();
32 list_2.add(new User(R.drawable.fanbingbign, "范冰冰", true));
33 list_2.add(new User(R.drawable.libingbing, "李冰冰", false));
34 list_2.add(new User(R.drawable.linxinru, "林心如", false));
35 list_2.add(new User(R.drawable.liutao, "刘涛", true));
36 UserGroup user_2 = new UserGroup("美女明星", list_2);
37 List<User> list_3 = new ArrayList<UserGroup.User>();
38 list_3.add(new User(R.drawable.liushishi, "刘诗诗", true));
39 list_3.add(new User(R.drawable.liuyifei, "刘亦菲", true));
40 list_3.add(new User(R.drawable.songhuiqiao, "宋慧乔", false));
41 list_3.add(new User(R.drawable.zhaoliying, "赵丽颖", true));
42 UserGroup user_3 = new UserGroup("女神", list_3);
43 List<User> list_4 = new ArrayList<UserGroup.User>();
44 list_4.add(new User(R.drawable.zhaoliying, "赵丽颖", false));
45 list_4.add(new User(R.drawable.gaoyuanyuan, "高圆圆", true));
46 list_4.add(new User(R.drawable.songhuiqiao, "宋慧乔", false));
47 list_4.add(new User(R.drawable.zhaoliying, "赵丽颖", true));
48 UserGroup user_4 = new UserGroup("女神", list_4);
49 mlist.add(user_1);
50 mlist.add(user_2);
51 mlist.add(user_3);
52 mlist.add(user_4);
53 }
54 }
1 package com.example.lesson6_11_id19;
2
3 import java.util.List;
4
5 import com.example.lesson6_11_id19.UserGroup.User;
6
7 import android.content.Context;
8 import android.view.View;
9 import android.view.ViewGroup;
10 import android.widget.BaseExpandableListAdapter;
11 import android.widget.ImageView;
12 import android.widget.TextView;
13
14 public class MyAdapter extends BaseExpandableListAdapter{
15 private Context mContext;
16 private List<UserGroup> mlist;
17
18
19
20 public MyAdapter(Context context, List<UserGroup> list) {
21 this.mContext = context;
22 this.mlist = list;
23 }
24
25 @Override
26 public int getGroupCount() {
27 return mlist.size();
28 }
29
30 @Override
31 public int getChildrenCount(int groupPosition) {
32 return mlist.get(groupPosition).users.size();
33 }
34
35 @Override
36 public UserGroup getGroup(int groupPosition) {
37 return mlist.get(groupPosition);
38 }
39
40 @Override
41 public User getChild(int groupPosition, int childPosition) {
42 return mlist.get(groupPosition).users.get(childPosition);
43 }
44
45 @Override
46 public long getGroupId(int groupPosition) {
47 return groupPosition;
48 }
49
50 @Override
51 public long getChildId(int groupPosition, int childPosition) {
52 return childPosition;
53 }
54
55 @Override
56 public boolean hasStableIds() {
57 return true;
58 }
59
60 @Override
61 public View getGroupView(int groupPosition, boolean isExpanded,
62 View convertView, ViewGroup parent) {
63 GroupHolder holder;
64 if (convertView == null) {
65 convertView = View.inflate(mContext, R.layout.item_group, null);
66 holder = new GroupHolder(convertView);
67 convertView.setTag(holder);
68 }else {
69 holder = (GroupHolder) convertView.getTag();
70 }
71 UserGroup userGroup = getGroup(groupPosition);
72 holder.tv_groupName.setText(userGroup.getGroupName());
73 holder.tv_numble.setText(userGroup.getOnline());
74 return convertView;
75 }
76
77 @Override
78 public View getChildView(int groupPosition, int childPosition,
79 boolean isLastChild, View convertView, ViewGroup parent) {
80 ChildHolder holder;
81 if (convertView == null) {
82 convertView = View.inflate(mContext, R.layout.item_child, null);
83 holder = new ChildHolder(convertView);
84 convertView.setTag(holder);
85 }else {
86 holder = (ChildHolder) convertView.getTag();
87 }
88 User user = getChild(groupPosition, childPosition);
89 holder.iv_pic.setImageResource(user.getImgId());
90 holder.tv_name.setText(user.getNickName());
91 holder.tv_online.setText(user.isOnline()?"[在线]":"[离线]");
92 return convertView;
93 }
94
95 @Override
96 public boolean isChildSelectable(int groupPosition, int childPosition) {
97 return true;
98 }
99 class GroupHolder{
100 TextView tv_groupName,tv_numble;
101 public GroupHolder(View convertView) {
102 tv_groupName = (TextView) convertView.findViewById(R.id.tv_groupName);
103 tv_numble = (TextView) convertView.findViewById(R.id.tv_numble);
104 }
105
106 }
107
108 class ChildHolder{
109 ImageView iv_pic;
110 TextView tv_name;
111 TextView tv_online;
112 public ChildHolder(View convertView) {
113 iv_pic = (ImageView) convertView.findViewById(R.id.iv_pic);
114 tv_name = (TextView) convertView.findViewById(R.id.tv_name);
115 tv_online = (TextView) convertView.findViewById(R.id.tv_online);
116 }
117
118 }
119 }
1 package com.example.lesson6_11_id19;
2
3 import java.util.ArrayList;
4 import java.util.List;
5
6 public class UserGroup {
7 String groupName;
8 List<User> users = new ArrayList<User>();
9
10
11 public String getGroupName() {
12 return groupName;
13 }
14
15
16 public void setGroupName(String groupName) {
17 this.groupName = groupName;
18 }
19
20
21 public List<User> getUsers() {
22 return users;
23 }
24
25
26 public void setUsers(List<User> users) {
27 this.users = users;
28 }
29
30
31 public UserGroup(String groupName, List<User> users) {
32 super();
33 this.groupName = groupName;
34 this.users = users;
35 }
36 // 获取在线的人数
37 public String getOnline(){
38 int online = 0;
39 for (int i = 0; i < users.size(); i++) {
40 if (users.get(i).isOnline) {
41 online++;
42 }
43 }
44 return online+"/"+users.size();
45
46 }
47
48 // 定义一个User类
49 static class User{
50 int imgId;
51 String nickName;
52 boolean isOnline;
53
54 public User(int imgId, String nickName, boolean isOnline) {
55 super();
56 this.imgId = imgId;
57 this.nickName = nickName;
58 this.isOnline = isOnline;
59 }
60
61 public int getImgId() {
62 return imgId;
63 }
64
65 public void setImgId(int imgId) {
66 this.imgId = imgId;
67 }
68
69 public String getNickName() {
70 return nickName;
71 }
72
73 public void setNickName(String nickName) {
74 this.nickName = nickName;
75 }
76
77 public boolean isOnline() {
78 return isOnline;
79 }
80
81 public void setOnline(boolean isOnline) {
82 this.isOnline = isOnline;
83 }
84
85 }
86 }
时间： 2024-08-25 05:40:19