原文：http://blog.youkuaiyun.com/qq_33689414/article/details/53914439
Android应用图标上的小红点Badge实现
为了增加APP的日活，在Android中有许多的应用仿苹果的在应用图标上显示小红点。当然有着一些手机ROM对小红点的支持，比如小米，三星等。
我们下面看下如何实现：
MainActivity:
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58public class MainActivity extends AppCompatActivity {
private Handler handler = new Handler();
private Runnable runnable = new MyRunnable();
public class MyRunnable implements Runnable {
@Override
public void run() {
handler.postDelayed(runnable, 5000);
BadgeUtil.setBadgeCount(getApplicationContext(), getCount(), R.mipmap.ic_launcher);
}
}
private int getCount() {
return new Random().nextInt(100);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button start = (Button) findViewById(R.id.start);
Button stop = (Button) findViewById(R.id.stop);
start.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (handler == null) {
handler = new Handler();
}
if (runnable == null) {
runnable = new MyRunnable();
}
handler.post(runnable);
}
});
stop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (handler != null) {
BadgeUtil.resetBadgeCount(getApplicationContext(), R.mipmap.ic_launcher);
handler.removeCallbacksAndMessages(null);
runnable = null;
handler = null;
}
}
});
}
}
BadgeUtil：目前支持小米，三星，LG，索尼,HTC等手机
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145public final class BadgeUtil {
private BadgeUtil() throws InstantiationException {
throw new InstantiationException("This class is not for instantiation");
}
/** * 设置Badge 目前支持Launcher */
public static void setBadgeCount(Context context, int count, int iconResId) {
if (count <= 0) {
count = 0;
} else {
count = Math.max(0, Math.min(count, 99));
}
if (Build.MANUFACTURER.equalsIgnoreCase("xiaomi")) {
setBadgeOfMIUI(context, count, iconResId);
} else if (Build.MANUFACTURER.equalsIgnoreCase("sony")) {
setBadgeOfSony(context, count);
} else if (Build.MANUFACTURER.toLowerCase().contains("samsung") ||
Build.MANUFACTURER.toLowerCase().contains("lg")) {
setBadgeOfSumsung(context, count);
} else if (Build.MANUFACTURER.toLowerCase().contains("htc")) {
setBadgeOfHTC(context, count);
} else if (Build.MANUFACTURER.toLowerCase().contains("nova")) {
setBadgeOfNova(context, count);
} else {
Toast.makeText(context, "Not Found Support Launcher", Toast.LENGTH_LONG).show();
}
}
/** * 设置MIUI的Badge */
private static void setBadgeOfMIUI(Context context, int count, int iconResId) {
NotificationManager mNotificationManager = (NotificationManager) context
.getSystemService(Context.NOTIFICATION_SERVICE);
NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
builder.setContentTitle("标题").setContentText("消息正文").setSmallIcon(iconResId);
Notification notification = builder.build();
try {
Field field = notification.getClass().getDeclaredField("extraNotification");
Object extraNotification = field.get(notification);
Method method = extraNotification.getClass().getDeclaredMethod("setMessageCount", int.class);
method.invoke(extraNotification, count);
} catch (Exception e) {
e.printStackTrace();
}
mNotificationManager.notify(0, notification);
}
/** * 设置索尼的Badge * 需添加权限： */
private static void setBadgeOfSony(Context context, int count) {
String launcherClassName = getLauncherClassName(context);
if (launcherClassName == null) {
return;
}
boolean isShow = true;
if (count == 0) {
isShow = false;
}
Intent localIntent = new Intent();
localIntent.setAction("com.sonyericsson.home.action.UPDATE_BADGE");
localIntent.putExtra("com.sonyericsson.home.intent.extra.badge.SHOW_MESSAGE", isShow);//是否显示
localIntent.putExtra("com.sonyericsson.home.intent.extra.badge.ACTIVITY_NAME", launcherClassName);//启动页
localIntent.putExtra("com.sonyericsson.home.intent.extra.badge.MESSAGE", String.valueOf(count));//数字
localIntent.putExtra("com.sonyericsson.home.intent.extra.badge.PACKAGE_NAME", context.getPackageName());//包名
context.sendBroadcast(localIntent);
}
/** * 设置三星的Badge\设置LG的Badge */
private static void setBadgeOfSumsung(Context context, int count) {
// 获取你当前的应用
String launcherClassName = getLauncherClassName(context);
if (launcherClassName == null) {
return;
}
Intent intent = new Intent("android.intent.action.BADGE_COUNT_UPDATE");
intent.putExtra("badge_count", count);
intent.putExtra("badge_count_package_name", context.getPackageName());
intent.putExtra("badge_count_class_name", launcherClassName);
context.sendBroadcast(intent);
}
/** * 设置HTC的Badge */
private static void setBadgeOfHTC(Context context, int count) {
Intent intentNotification = new Intent("com.htc.launcher.action.SET_NOTIFICATION");
ComponentName localComponentName = new ComponentName(context.getPackageName(), getLauncherClassName(context));
intentNotification.putExtra("com.htc.launcher.extra.COMPONENT", localComponentName.flattenToShortString());
intentNotification.putExtra("com.htc.launcher.extra.COUNT", count);
context.sendBroadcast(intentNotification);
Intent intentShortcut = new Intent("com.htc.launcher.action.UPDATE_SHORTCUT");
intentShortcut.putExtra("packagename", context.getPackageName());
intentShortcut.putExtra("count", count);
context.sendBroadcast(intentShortcut);
}
/** * 设置Nova的Badge */
private static void setBadgeOfNova(Context context, int count) {
ContentValues contentValues = new ContentValues();
contentValues.put("tag", context.getPackageName() + "/" + getLauncherClassName(context));
contentValues.put("count", count);
context.getContentResolver().insert(Uri.parse("content://com.teslacoilsw.notifier/unread_count"),
contentValues);
}
public static void setBadgeOfMadMode(Context context, int count, String packageName, String className) {
Intent intent = new Intent("android.intent.action.BADGE_COUNT_UPDATE");
intent.putExtra("badge_count", count);
intent.putExtra("badge_count_package_name", packageName);
intent.putExtra("badge_count_class_name", className);
context.sendBroadcast(intent);
}
/** * 重置Badge */
public static void resetBadgeCount(Context context, int iconResId) {
setBadgeCount(context, 0, iconResId);
}
public static String getLauncherClassName(Context context) {
PackageManager packageManager = context.getPackageManager();
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.setPackage(context.getPackageName());
intent.addCategory(Intent.CATEGORY_LAUNCHER);
ResolveInfo info = packageManager.resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);
if (info == null) {
info = packageManager.resolveActivity(intent, 0);
}
return info.activityInfo.name;
}
}
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