最近项目想要做消息提醒功能，从图标提醒到导航栏到里边的模块图标每一级都要有提醒，桌面图标提醒比较容易，详细的模块需要自己定制，这里主要说说主页面的消息提醒如何实现，先看看效果图：
首先是用TabHost实现主页面，这种方式的好处在于每个页面用的是activity而不是fragment，操作起来更加方便。
主页面xml
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="match_parent"
android:layout_height="0.0dip"
android:layout_weight="1.0" />
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0.0"
android:visibility="gone" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/colorGray"/>
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<RadioGroup
android:id="@+id/main_tab_group"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:layout_gravity="center"
android:background="@color/colorWhite"
android:gravity="bottom"
android:orientation="horizontal"
>
<RadioButton
android:id="@+id/home_tab_home"
style="@style/HomeButton"
android:layout_weight="1.0"
android:checked="true"
android:drawableTop="@drawable/home_radiobutton_home"
android:text="@string/home"
android:layout_gravity="center" />
<RadioButton
android:id="@+id/home_tab_attention"
style="@style/HomeButton"
android:layout_weight="1.0"
android:drawableTop="@drawable/home_radiobutton_attention"
android:text="@string/attention"
android:layout_gravity="center" />
<BadgeRadioButton
android:id="@+id/home_tab_all"
style="@style/HomeButton"
android:paddingTop="4dp"
android:layout_weight="1.0"
android:drawableTop="@drawable/home_radiobutton_all"
android:text="@string/all"
android:layout_gravity="center" />
<RadioButton
android:id="@+id/home_tab_user"
style="@style/HomeButton"
android:layout_weight="1.0"
android:drawableTop="@drawable/home_radiobutton_person"
android:text="@string/user"
android:layout_gravity="center" />
</RadioGroup>
</FrameLayout>
</LinearLayout>
</TabHost>然后是主页面activity
import android.Manifest;
import android.app.TabActivity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.view.ContextThemeWrapper;
import android.util.TypedValue;
import android.view.KeyEvent;
import android.view.Window;
import android.view.WindowManager;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TabHost;
import android.widget.Toast;
import org.xutils.common.Callback;
import org.xutils.http.RequestParams;
import org.xutils.view.annotation.ViewInject;
import org.xutils.x;
import cn.com.lljk.TrafficStatsUtils;
import cn.com.R;
import cn.com.common.ActivityCollector;
import cn.com.service.InitModuleService;
import cn.com.service.MessageService;
import cn.com.utils.SharedPreferencesUtil;
import cn.com.view.BadgeRadioButton;
import static cn.com.common.MyApplication.app;
/**
*
*/
public class MainActivity extends TabActivity {
@ViewInject(R.id.home_tab_home)
private RadioButton rHome ;
@ViewInject(R.id.home_tab_attention)
private RadioButton rAtten ;
@ViewInject(R.id.home_tab_all)
private BadgeRadioButton rAll ;
@ViewInject(R.id.home_tab_user)
private RadioButton rUser ;
private TabHost tabHost;
private LocationManager locationManager;
private String X = "1";
private String Y = "2";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActivityCollector.finishAll();
ActivityCollector.addActivity(this);
setContentView(R.layout.activity_main);
x.view().inject(this);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
Window window = getWindow();
// Translucent status bar
// window.setFlags(
// WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS,
// WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
}
//透明状态栏
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
init();
}
@Override
protected void onDestroy() {
super.onDestroy();
TrafficStatsUtils.trafficMonitorEnd(getBaseContext());
ActivityCollector.removeActivity(this);
}
private void init(){
tabHost=this.getTabHost();
TabHost.TabSpec spec;
Intent intent;
intent=new Intent().setClass(this, HomeActivity.class);
spec=tabHost.newTabSpec(getResources().getString(R.string.home)).setIndicator(getResources().getString(R.string.home)).setContent(intent);
tabHost.addTab(spec);
intent=new Intent().setClass(this,AttentionActivity.class);
spec=tabHost.newTabSpec(getResources().getString(R.string.attention)).setIndicator(getResources().getString(R.string.attention)).setContent(intent);
tabHost.addTab(spec);
intent=new Intent().setClass(this,AllActivity.class);
spec=tabHost.newTabSpec(getResources().getString(R.string.all)).setIndicator(getResources().getString(R.string.all)).setContent(intent);
tabHost.addTab(spec);
intent=new Intent().setClass(this,PersonActivity.class);
spec=tabHost.newTabSpec(getResources().getString(R.string.user)).setIndicator(getResources().getString(R.string.user)).setContent(intent);
tabHost.addTab(spec);
tabHost.setCurrentTab(0);
RadioGroup radioGroup=(RadioGroup) this.findViewById(R.id.main_tab_group);
initRadioButton(24);
radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
switch (checkedId) {
case R.id.home_tab_home: { //主页
tabHost.setCurrentTabByTag(getResources().getString(R.string.home));
break;
}
case R.id.home_tab_attention: { //关注
tabHost.setCurrentTabByTag(getResources().getString(R.string.attention));
break;
}
case R.id.home_tab_all:{
tabHost.setCurrentTabByTag(getResources().getString(R.string.all));
break;
}
case R.id.home_tab_user:{
tabHost.setCurrentTabByTag(getResources().getString(R.string.user));
break;
}
default:
break;
}
}
});
Intent intent1 = new Intent(this, MessageService.class) ;
startService(intent1) ;
getBadge();
}
private void getBadge(){
rAll.setBadgeNumber(10) ; //设置显示的消息数
}
public void setTabHostPager(int position){
tabHost.setCurrentTab(position);
}
//初始化radio图标大小
private void initRadioButton(float height){
Drawable drawable1 = getResources().getDrawable(R.drawable.home_radiobutton_home);
drawable1.setBounds(0, 0, (int)getRawSize(height), (int)getRawSize(height));//第一0是距左右边距离，第二0是距上下边距离，第三69长度,第四宽度
rHome.setCompoundDrawables(null, drawable1, null, null);//只放上面
Drawable drawable2 = getResources().getDrawable(R.drawable.home_radiobutton_attention);
drawable2.setBounds(0, 0, (int)getRawSize(height), (int)getRawSize(height));
rAtten.setCompoundDrawables(null, drawable2, null, null);
Drawable drawable3 = getResources().getDrawable(R.drawable.home_radiobutton_all);
drawable3.setBounds(0, 0, (int)getRawSize(height), (int)getRawSize(height));
rAll.setCompoundDrawables(null, drawable3, null, null);
Drawable drawable4 = getResources().getDrawable(R.drawable.home_radiobutton_person);
drawable4.setBounds(0, 0, (int)getRawSize(height), (int)getRawSize(height));
rUser.setCompoundDrawables(null, drawable4, null, null);
}
//传入PX值得到dp，dip等
public float getRawSize(float value) {
Resources res = this.getResources();
return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, value, res.getDisplayMetrics());
}
}BadgeRadioButtonimport android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.support.annotation.ColorInt;
import android.text.TextPaint;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
/**
* <p>带标记的 RadioButton，目前仅支持 drawableTop 的按钮 right的没测试</p><br>
*
* 使用时直接 setBadgeNum
* setBadgeTextSize -- 设置字体颜色
* setBadgePadding -- 设置内边距
* setBadgeShowShadow -- 设置是否显示阴影
* setBadgeColorBackground -- 设置背景颜色
* setBadgeColorBadgeText -- 设置字体颜色
* setBadgeExact -- 设置是否截取图标
* setBadgeOffX -- 设置X的偏移量
* setBadgeOffY -- 设置Y的偏移量
* setBadgeText -- 设置文本
* setBadgeGravity -- 设置标记的位置
*/
public class BadgeRadioButton extends DrawableCenterRadioButton {
/** 字体高度 */
private float mFontHeight;
/** 字体宽度 */
private float mFontWidth;
/** 位图集合 */
private Drawable[] mDrawables;
/** 位图 */
private Drawable mDrawableBackground;
/** 背景画笔 */
private Paint mBadgeBackgroundPaint;
/** 数字画笔 */
private Paint mBadgeTextPaint;
/** 数字字体大小 默认8sp */
private float mBadgeTextSize;
/** 内边距 默认4dp */
private int mBadgePadding;
/** x偏移量 */
private int mBadgeOffX;
/** Y偏移量 */
private int mBadgeOffY;
/** 数字 */
private int mBadgeNumber;
/** 数字文本 */
private String mBadgeText;
/** 是否存在阴影 默认存在 */
private boolean mBadgeShowShadow;
/** 背景颜色 默认红色 */
private int mBadgeColorBackground;
/** 字体颜色 默认白色 */
private int mBadgeColorBadgeText;
/** 是否截取数字 */
private boolean mBadgeExact;
/** 背景矩形 */
private RectF mBadgeBackgroundRect;
/** 位置，默认中心 */
private int mGravity = Gravity.CENTER;
/**
* 构造函数
*
* @param context 上下文
*/
public BadgeRadioButton(Context context) {
super(context);
init();
}
/**
* 构造函数
*
* @param context 上下文
* @param attrs 属性
*/
public BadgeRadioButton(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
/**
* 构造函数
*
* @param context 上下文
* @param attrs 属性
* @param defStyle 样式
*/
public BadgeRadioButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (null != mDrawableBackground && null != mBadgeText) {
showShadowImpl(mBadgeShowShadow, mBadgeBackgroundPaint);
float maxPadding = getOffSize();
if (mBadgePadding > maxPadding) {
if (mBadgePadding - maxPadding > mBadgeOffY) {
mBadgeOffY = (int) (mBadgePadding - maxPadding);
}
}
drawWithDrawable(canvas);
} else if (null == mDrawableBackground && null != mBadgeText) {
showShadowImpl(mBadgeShowShadow, mBadgeBackgroundPaint);
float maxPadding = getOffSize();
if (mBadgePadding > maxPadding) {
if (mBadgePadding - maxPadding > mBadgeOffY) {
mBadgeOffY = (int) (mBadgePadding - maxPadding);
}
}
drawWithNoDrawable(canvas);
}
}
/**
* 无图标时候，绘制标签
*
* @param canvas 画布
*/
private void drawWithNoDrawable(Canvas canvas) {
float textWidth = getPaint().measureText(getText().toString());
if (mBadgeText.length() == 0) {
//绘制圆
if (mGravity == Gravity.CENTER) {
canvas.drawCircle((getWidth() + textWidth) / 2 + mBadgeOffX, mFontHeight / 2 + mBadgeOffY, mFontHeight / 2 + mBadgePadding, mBadgeBackgroundPaint);
} else if (mGravity == Gravity.RIGHT) {
canvas.drawCircle(getWidth() - mFontWidth / 2 - mBadgePadding, mFontHeight / 2 + mBadgeOffY, mFontHeight / 2 + mBadgePadding, mBadgeBackgroundPaint);
} else if (mGravity == Gravity.LEFT) {
canvas.drawCircle(mFontWidth / 2 + mBadgePadding, mFontHeight / 2 + mBadgeOffY, mFontHeight / 2 + mBadgePadding, mBadgeBackgroundPaint);
}
} else {
//多个字符，绘制椭圆
mBadgeBackgroundRect.left = (getWidth() + textWidth) / 2 - mFontWidth / 2 - mBadgePadding + mBadgeOffX;
mBadgeBackgroundRect.right = (getWidth() + textWidth) / 2 + mFontWidth / 2 + mBadgePadding + mBadgeOffX;
mBadgeBackgroundRect.top = -mBadgePadding + mBadgeOffY;
mBadgeBackgroundRect.bottom = mFontHeight + mBadgePadding + mBadgeOffY;
if (mGravity == Gravity.RIGHT) {
mBadgeBackgroundRect.left = getWidth() - mFontWidth - mBadgePadding * 2;
mBadgeBackgroundRect.right = getWidth();
} else if (mGravity == Gravity.LEFT) {
mBadgeBackgroundRect.left = 0;
mBadgeBackgroundRect.right = mFontWidth + mBadgePadding * 2;
}
canvas.drawRoundRect(mBadgeBackgroundRect, mFontHeight / 2 + mBadgePadding, mFontHeight / 2 + mBadgePadding, mBadgeBackgroundPaint);
}
//绘制文本
if (mGravity == Gravity.RIGHT) {
canvas.drawText(mBadgeText, getWidth() - mFontWidth - mBadgePadding, mFontHeight + mBadgeOffY, mBadgeTextPaint);
} else if (mGravity == Gravity.LEFT) {
canvas.drawText(mBadgeText, mBadgePadding, mFontHeight + mBadgeOffY, mBadgeTextPaint);
} else {
canvas.drawText(mBadgeText, (getWidth() + textWidth) / 2 - mFontWidth / 2 + mBadgeOffX, mFontHeight + mBadgeOffY, mBadgeTextPaint);
}
}
/**
* 有图标时候，绘制标签
*
* @param canvas 画布
*/
private void drawWithDrawable(Canvas canvas) {
if (mBadgeText.length() == 0) {
//绘制圆
if (mGravity == Gravity.CENTER) {
canvas.drawCircle((getWidth() + mDrawableBackground.getIntrinsicWidth()) / 2 + mBadgeOffX, mFontHeight / 2 + mBadgeOffY, mFontHeight / 2 + mBadgePadding, mBadgeBackgroundPaint);
} else if (mGravity == Gravity.RIGHT) {
canvas.drawCircle(getWidth() - mFontWidth / 2 - mBadgePadding, mFontHeight / 2 + mBadgeOffY, mFontHeight / 2 + mBadgePadding, mBadgeBackgroundPaint);
} else if (mGravity == Gravity.LEFT) {
canvas.drawCircle(mFontWidth / 2 + mBadgePadding, mFontHeight / 2 + mBadgeOffY, mFontHeight / 2 + mBadgePadding, mBadgeBackgroundPaint);
}
} else {
//多个字符，绘制椭圆
mBadgeBackgroundRect.left = (getWidth() + mDrawableBackground.getIntrinsicWidth()) / 2 - mFontWidth / 2 - mBadgePadding + mBadgeOffX;
mBadgeBackgroundRect.right = (getWidth() + mDrawableBackground.getIntrinsicWidth()) / 2 + mFontWidth / 2 + mBadgePadding + mBadgeOffX;
mBadgeBackgroundRect.top = -mBadgePadding + mBadgeOffY;
mBadgeBackgroundRect.bottom = mFontHeight + mBadgePadding + mBadgeOffY;
if (mGravity == Gravity.RIGHT) {
mBadgeBackgroundRect.left = getWidth() - mFontWidth - mBadgePadding * 2;
mBadgeBackgroundRect.right = getWidth();
} else if (mGravity == Gravity.LEFT) {
mBadgeBackgroundRect.left = 0;
mBadgeBackgroundRect.right = mFontWidth + mBadgePadding * 2;
}
canvas.drawRoundRect(mBadgeBackgroundRect, mFontHeight / 2 + mBadgePadding, mFontHeight / 2 + mBadgePadding, mBadgeBackgroundPaint);
}
//绘制文本
if (mGravity == Gravity.RIGHT) {
canvas.drawText(mBadgeText, getWidth() - mFontWidth - mBadgePadding, mFontHeight + mBadgeOffY, mBadgeTextPaint);
} else if (mGravity == Gravity.LEFT) {
canvas.drawText(mBadgeText, mBadgePadding, mFontHeight + mBadgeOffY, mBadgeTextPaint);
} else {
canvas.drawText(mBadgeText, (getWidth() + mDrawableBackground.getIntrinsicWidth()) / 2 - mFontWidth / 2 + mBadgeOffX, mFontHeight + mBadgeOffY, mBadgeTextPaint);
}
}
/**
* 设置显示数字
*
* @param badgeNumber 标记数字
*/
public BadgeRadioButton setBadgeNumber(int badgeNumber) {
mBadgeNumber = badgeNumber;
if (mBadgeNumber < 0) {
mBadgeText = null;
} else if (mBadgeNumber > 99) {
mBadgeText = mBadgeExact ? String.valueOf(mBadgeNumber) : "99+";
} else if (mBadgeNumber > 0 && mBadgeNumber <= 99) {
mBadgeText = String.valueOf(mBadgeNumber);
} else if (mBadgeNumber == 0) {
mBadgeText = "";
}
return invalidateLayout();
}
/**
* 设置显示数字
*
* @param badge 标记文本
*/
public BadgeRadioButton setBadgeText(String badge) {
mBadgeText = badge;
return invalidateLayout();
}
/**
* 重新刷新界面
*/
private BadgeRadioButton invalidateLayout() {
if (!TextUtils.isEmpty(mBadgeText)) {
measureText();
}
invalidate();
return this;
}
/**
* 测量文本高度和宽度
*/
private void measureText() {
mFontHeight = Math.abs(mBadgeTextPaint.getFontMetrics().descent + mBadgeTextPaint.getFontMetrics().ascent);
mFontWidth = mBadgeTextPaint.measureText(mBadgeText);
}
/**
* 为画笔设置阴影
*
* @param showShadow 是否显示
* @param badgeBackgroundPaint 画笔
*/
private void showShadowImpl(boolean showShadow, Paint badgeBackgroundPaint) {
int x = dp2px(1);
int y = dp2px(1.5f);
badgeBackgroundPaint.setShadowLayer(showShadow ? dp2px(2f) : 0, x, y, 0x33000000);
}
@Override
void init() {
super.init();
setLayerType(View.LAYER_TYPE_SOFTWARE, null);
mBadgeTextSize = dp2px(10);
mBadgePadding = dp2px(4);
mBadgeShowShadow = true;
mBadgeColorBackground = Color.RED;
mBadgeColorBadgeText = Color.WHITE;
mBadgeOffX = 0;
mBadgeOffY = 0;
mFontWidth = 0;
mFontHeight = 0;
mBadgeBackgroundRect = new RectF(0, 0, 0, 0);
//目前只支持drawableTop的RadioButton
mDrawables = getCompoundDrawables();
if (null != mDrawables[1]) {
mDrawableBackground = mDrawables[1];
}
/* 理论上可以支持drawableRight，但是没测试
else if (null != mDrawables[2]) {
mDrawableBackground = mDrawables[2];
}*/
mBadgeTextPaint = new TextPaint();
mBadgeTextPaint.setAntiAlias(true);
mBadgeTextPaint.setSubpixelText(true);
mBadgeTextPaint.setFakeBoldText(true);
mBadgeTextPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
mBadgeTextPaint.setTypeface(Typeface.DEFAULT_BOLD);
mBadgeTextPaint.setDither(true);
mBadgeTextPaint.setColor(mBadgeColorBadgeText);
mBadgeTextPaint.setTextSize(mBadgeTextSize);
mBadgeBackgroundPaint = new Paint();
mBadgeBackgroundPaint.setAntiAlias(true);
mBadgeBackgroundPaint.setStyle(Paint.Style.FILL);
mBadgeBackgroundPaint.setDither(true);
mBadgeBackgroundPaint.setColor(mBadgeColorBackground);
showShadowImpl(mBadgeShowShadow, mBadgeBackgroundPaint);
}
/**
* 设置字体大小，默认8dp
*
* @param badgeTextSize 内边距
*/
public BadgeRadioButton setBadgeTextSize(float badgeTextSize) {
mBadgeTextSize = badgeTextSize;
mBadgeTextPaint.setTextSize(mBadgeTextSize);
return invalidateLayout();
}
/**
* 设置标记的位置
* 目前仅支持Gravity.LEFT Gravity.RIGHT Gravity.CENTER，默认Gravity.CENTER
*
* @param gravity {@link Gravity}
*/
public BadgeRadioButton setBadgeGravity(int gravity) {
mGravity = gravity;
return invalidateLayout();
}
/**
* 设置内边距，默认4dp
*
* @param badgePadding 内边距
*/
public BadgeRadioButton setBadgePadding(int badgePadding) {
mBadgePadding = badgePadding;
return invalidateLayout();
}
/**
* 设置是否显示阴影，默认显示
*
* @param badgeShowShadow true - 显示
*/
public BadgeRadioButton setBadgeShowShadow(boolean badgeShowShadow) {
mBadgeShowShadow = badgeShowShadow;
return invalidateLayout();
}
/**
* 设置背景颜色，默认红色
*
* @param badgeColorBackground 背景颜色
*/
public BadgeRadioButton setBadgeColorBackground(@ColorInt int badgeColorBackground) {
mBadgeColorBackground = badgeColorBackground;
mBadgeBackgroundPaint.setColor(mBadgeColorBackground);
return invalidateLayout();
}
/**
* 设置标记字体颜色，默认白色
*
* @param badgeColorBadgeText 字体颜色
*/
public BadgeRadioButton setBadgeColorBadgeText(int badgeColorBadgeText) {
mBadgeColorBadgeText = badgeColorBadgeText;
mBadgeTextPaint.setColor(mBadgeColorBadgeText);
return invalidateLayout();
}
/**
* 设置X偏移量
*
* @param badgeOffX x偏移量
*/
public BadgeRadioButton setBadgeOffX(int badgeOffX) {
mBadgeOffX = badgeOffX;
return invalidateLayout();
}
/**
* 设置Y偏移量
*
* @param badgeOffY Y偏移量
*/
public BadgeRadioButton setBadgeOffY(int badgeOffY) {
mBadgeOffY = badgeOffY;
return invalidateLayout();
}
/**
* 是否截取字体，默认截取，如 100 -> 99+
*
* @param badgeExact true - 截取
*/
public BadgeRadioButton setBadgeExact(boolean badgeExact) {
mBadgeExact = badgeExact;
return invalidateLayout();
}
/**
* dp转px
*
* @param dpValue dp值
* @return px值
*/
public int dp2px(float dpValue) {
final float scale = getContext().getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
}DrawableCenterRadioButtonimport android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.Gravity;
public class DrawableCenterRadioButton extends android.support.v7.widget.AppCompatRadioButton {
/** 字体高度 */
private float mFontHeight;
/** 位图集合 */
private Drawable[] mDrawables;
/** 字体偏移数据 */
private float mOffSize;
/**
* 构造函数
*
* @param context 上下文
*/
public DrawableCenterRadioButton(Context context) {
super(context);
init();
}
/**
* 构造函数
*
* @param context 上下文
* @param attrs 属性
*/
public DrawableCenterRadioButton(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
/**
* 构造函数
*
* @param context 上下文
* @param attrs 属性
* @param defStyle 样式
*/
public DrawableCenterRadioButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
mDrawables = getCompoundDrawables();
if (mDrawables[0] != null || mDrawables[2] != null) {
// 左、右
setGravity(Gravity.CENTER_VERTICAL | (mDrawables[0] != null ? Gravity.LEFT : Gravity.RIGHT));
} else if (mDrawables[1] != null || mDrawables[3] != null) {
// 上、下
setGravity(Gravity.CENTER_HORIZONTAL | (mDrawables[1] != null ? Gravity.TOP : Gravity.BOTTOM));
Paint.FontMetrics fm = getPaint().getFontMetrics();
mFontHeight = (float) Math.ceil(fm.descent - fm.ascent);
}
super.onLayout(changed, left, top, right, bottom);
}
@Override
protected void onDraw(Canvas canvas) {
int drawablePadding = getCompoundDrawablePadding();
if (mDrawables[0] != null) {
// 左
float textWidth = getPaint().measureText(getText().toString());
int drawableWidth = mDrawables[0].getIntrinsicWidth();
float bodyWidth = textWidth + drawableWidth + drawablePadding;
if (TextUtils.isEmpty(getText())) {
bodyWidth = drawableWidth;
}
mOffSize = (getWidth() - bodyWidth) / 2;
canvas.translate(mOffSize, 0);
} else if (mDrawables[2] != null) {
// 右
float textWidth = getPaint().measureText(getText().toString());
int drawableWidth = mDrawables[2].getIntrinsicWidth();
float bodyWidth = textWidth + drawableWidth + drawablePadding;
if (TextUtils.isEmpty(getText())) {
bodyWidth = drawableWidth;
}
mOffSize = (bodyWidth - getWidth()) / 2;
canvas.translate(mOffSize, 0);
} else if (mDrawables[1] != null) {
// 上
int drawableHeight = mDrawables[1].getIntrinsicHeight();
float bodyHeight = mFontHeight + drawableHeight + drawablePadding;
if (TextUtils.isEmpty(getText())) {
bodyHeight = drawableHeight;
}
mOffSize = (getHeight() - bodyHeight) / 2;
canvas.translate(0, mOffSize);
} else if (mDrawables[3] != null) {
// 下
int drawableHeight = mDrawables[3].getIntrinsicHeight();
float bodyHeight = mFontHeight + drawableHeight + drawablePadding;
if (TextUtils.isEmpty(getText())) {
bodyHeight = drawableHeight;
}
mOffSize = (bodyHeight - getHeight()) / 2;
canvas.translate(0, mOffSize);
}
super.onDraw(canvas);
}
public float getOffSize() {
return mOffSize;
}
/**
* 初始化
*/
void init() {
}
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