Truetime Android API，如何在打开活动时自动获取格林威治标准时间、太平洋标准时间、设备时间的值？

Question

我正在使用 API truetime-android。 https://github.com/instacart/truetime-android

我的问题是，如果我想获取 GMT、PST、设备时间的值。我必须按下按钮立即获取时间。我不喜欢这样，我希望每当我打开该活动时，三个 GMT、PST、设备时间已经有了值，所以我不需要按下按钮 Get Time Now 获取值 GMT、PST、设备时间。如何实施？

这是我的代码

public class SampleActivity extends AppCompatActivity {
private Button refreshBtn;
private TextView timeGMT;
private TextView timePST;
private TextView timeDeviceTime;

   protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.sample_activity);
    setupUI();
    init(this);
    click() ;
}

public static void init(final Context context) {
(new Thread(new Runnable() {
    public void run() {
        try {
           TrueTime.build().withNtpHost("time.google.com").withLoggingEnabled(false).
           withSharedPreferencesCache(context).
           withConnectionTimeout(31428).initialize();
        } catch (IOException var2) {
            var2.printStackTrace();
        }
    }
})).start();

private void click() {
    Date trueTime;
    refreshBtn!!.setOnClickListener(View.OnClickListener {
        if (!TrueTime.isInitialized()) {
            //do nothing
        } else {
       trueTime = TrueTime.now();
       Date deviceTime = new Date();
       timeGMT.setText(formatDate(trueTime, "yyyy-MM-dd HH:mm:ss",TimeZone.getTimeZone("GMT")));
       timePST.setText(formatDate(trueTime, "yyyy-MM-dd HH:mm:ss", TimeZone.getTimeZone("GMT07:00")));
       timeDeviceTime.setText(formatDate(deviceTime, "yyyy-MM-dd HH:mm:ss",TimeZone.getTimeZone("GMT-07:00"))));
        }
    }
}
private void setupUI() {
    refreshBtn = (Button) findViewById(R.id.tt_btn_refresh);
    timeGMT = (TextView) findViewById(R.id.tt_time_gmt);
    timePST = (TextView) findViewById(R.id.tt_time_pst);
    timeDeviceTime = (TextView) findViewById(R.id.tt_time_device);
}

private String formatDate(Date :date ,String : pattern,TimeZone : timeZone){
    String format = SimpleDateFormat(pattern, Locale.ENGLISH);
    format.timeZone = timeZone;
    return format.format(date);
}

Answer 1

试试这个。您可以在 onCreate 中找到我的更改

public class SampleActivity extends AppCompatActivity {
private Button refreshBtn;
private TextView timeGMT;
private TextView timePST;
private TextView timeDeviceTime;

   protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.sample_activity);
    setupUI();
    init(this);
    new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
        if (TrueTime.isInitialized()) {
           trueTime = TrueTime.now();
           Date deviceTime = new Date();
           timeGMT.setText(formatDate(trueTime, "yyyy-MM-dd HH:mm:ss",TimeZone.getTimeZone("GMT")));
           timePST.setText(formatDate(trueTime, "yyyy-MM-dd HH:mm:ss", TimeZone.getTimeZone("GMT07:00")));
           timeDeviceTime.setText(formatDate(deviceTime, "yyyy-MM-dd HH:mm:ss",TimeZone.getTimeZone("GMT-07:00"))));
        }
         }
        }, 1000);
}

public static void init(final Context context) {
(new Thread(new Runnable() {
    public void run() {
        try {
           TrueTime.build().withNtpHost("time.google.com").withLoggingEnabled(false).
           withSharedPreferencesCache(context).
           withConnectionTimeout(31428).initialize();
        } catch (IOException var2) {
            var2.printStackTrace();
        }
    }
})).start();

private void click() {
    Date trueTime;
    refreshBtn!!.setOnClickListener(View.OnClickListener {
          if (!TrueTime.isInitialized()) {
            //do nothing
        } else {
       trueTime = TrueTime.now();
       Date deviceTime = new Date();
       timeGMT.setText(formatDate(trueTime, "yyyy-MM-dd HH:mm:ss",TimeZone.getTimeZone("GMT")));
       timePST.setText(formatDate(trueTime, "yyyy-MM-dd HH:mm:ss", TimeZone.getTimeZone("GMT07:00")));
       timeDeviceTime.setText(formatDate(deviceTime, "yyyy-MM-dd HH:mm:ss",TimeZone.getTimeZone("GMT-07:00"))));
        }
    }
}
private void setupUI() {
    refreshBtn = (Button) findViewById(R.id.tt_btn_refresh);
    timeGMT = (TextView) findViewById(R.id.tt_time_gmt);
    timePST = (TextView) findViewById(R.id.tt_time_pst);
    timeDeviceTime = (TextView) findViewById(R.id.tt_time_device);
}

private String formatDate(Date :date ,String : pattern,TimeZone : timeZone){
    String format = SimpleDateFormat(pattern, Locale.ENGLISH);
    format.timeZone = timeZone;
    return format.format(date);
}