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        Intent emailIntent = new Intent(Intent.ACTION_SEND);
        emailIntent.setType("message/rfc822");
        emailIntent.putExtra(Intent.EXTRA_EMAIL, new String[]{emailAddress});
        emailIntent.putExtra(Intent.EXTRA_SUBJECT, emailSubject);
        emailIntent.putExtra(Intent.EXTRA_TEXT, emailContent);
        if (emailIntent.resolveActivity(context.getPackageManager()) != null) {
            context.startActivity(Intent.createChooser(emailIntent, "Send email ..."));
        } else {
            if (emailClientNotInstalledCallback != null) {
                emailClientNotInstalledCallback.handle();

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<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/block_user_btn"
        android:orderInCategory="90"
        android:title="@string/ls_profile_button_block"
        app:actionViewClass="android.widget.TextView"
        app:showAsAction="never" />

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 public static String converTime(long timestamp) {
        long currentSeconds = getFixedCurrentTime() / 1000;
        long timeGap = currentSeconds - timestamp / 1000;// 与现在时间相差秒数
        String timeStr = null;
        if (timeGap > 24 * 60 * 60 * 365) {// 1天以上
            // timeStr = timeGap / (24 * 60 * 60) + "天前";
            timeStr = new SimpleDateFormat("yyyy年MM月dd日").format(new Date(timestamp));
        } else if (timeGap > 24 * 60 * 60) {
            timeStr = new SimpleDateFormat("MM月dd日").format(new Date(timestamp));
            if (timeStr.startsWith("0")) {

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    var c = Calendar.getInstance()
                c.timeInMillis = System.currentTimeMillis()
                val hour = c.get(Calendar.HOUR_OF_DAY)
                val minute = c.get(Calendar.MINUTE)
                
                TimePickerDialog(context, TimePickerDialog.OnTimeSetListener { _, _, _ ->
                }, hour, minute, true).show()

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// 实现一

# 状态类
sealed class Resource<T>(
        val data: T? = null,
        val errorCode: Int? = null
) {
    class Success<T>(data: T) : Resource<T>(data)
    class Loading<T>(data: T? = null) : Resource<T>(data)
    class DataError<T>(errorCode: Int?) : Resource<T>(null, errorCode)