android - SimpleDateFormat 不在 KitKat 中生成月份名称

Question

在 KitKat 中，以下日期格式化程序会产生错误的结果。是我还是 KitKat？

对于除 KitKat 之外的所有版本，以下代码生成预期的“4 月 27 日”。但是，在 KitKat 上，它会记录“A​​ 27”。我检查了调试器以验证这不是布局问题 - SimpleDataFormat 创建的字符串是“A 27”。

SimpleDateFormat dateOnyFormat = new SimpleDateFormat(
            "MMMMM dd", Locale.US);

    Date startDate = new Date();

    String startTimeFormatted = dateOnyFormat.format(startDate);

    Log.i("DateTest","startTimeFormatted: "+startTimeFormatted);

有谁知道为什么 KitKat 格式会生成月份的第一个字母，而不是月份？

有什么解决办法吗？

这是插入了此代码的 ADT 的默认 Android 主要项目。

package com.example;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

import com.example.util.SystemUiHider;

import android.annotation.TargetApi;
import android.app.Activity;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

/**
 * An example full-screen activity that shows and hides the system UI (i.e. status bar and navigation/system bar) with
 * user interaction.
 * 
 * @see SystemUiHider
 */
public class MainActivity extends Activity {
/**
 * Whether or not the system UI should be auto-hidden after {@link #AUTO_HIDE_DELAY_MILLIS} milliseconds.
 */
private static final boolean AUTO_HIDE = true;

/**
 * If {@link #AUTO_HIDE} is set, the number of milliseconds to wait after user interaction before hiding the system
 * UI.
 */
private static final int AUTO_HIDE_DELAY_MILLIS = 3000;

/**
 * If set, will toggle the system UI visibility upon interaction. Otherwise, will show the system UI visibility upon
 * interaction.
 */
private static final boolean TOGGLE_ON_CLICK = true;

/**
 * The flags to pass to {@link SystemUiHider#getInstance}.
 */
private static final int HIDER_FLAGS = SystemUiHider.FLAG_HIDE_NAVIGATION;

/**
 * The instance of the {@link SystemUiHider} for this activity.
 */
private SystemUiHider mSystemUiHider;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    final View controlsView = findViewById(R.id.fullscreen_content_controls);
    final View contentView = findViewById(R.id.fullscreen_content);

     SimpleDateFormat dateOnyFormat = new SimpleDateFormat(
            "MMMMM dd", Locale.US);

    Date startDate = new Date();

    String startTimeFormatted = dateOnyFormat.format(startDate);

    Log.i("DateTest","startTimeFormatted: "+startTimeFormatted);

    // Set up an instance of SystemUiHider to control the system UI for
    // this activity.
    mSystemUiHider = SystemUiHider.getInstance(this, contentView, HIDER_FLAGS);
    mSystemUiHider.setup();
    mSystemUiHider.setOnVisibilityChangeListener(new SystemUiHider.OnVisibilityChangeListener() {
        // Cached values.
        int mControlsHeight;
        int mShortAnimTime;

        @Override
        @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
        public void onVisibilityChange(boolean visible) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
                // If the ViewPropertyAnimator API is available
                // (Honeycomb MR2 and later), use it to animate the
                // in-layout UI controls at the bottom of the
                // screen.
                if (mControlsHeight == 0) {
                    mControlsHeight = controlsView.getHeight();
                }
                if (mShortAnimTime == 0) {
                    mShortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);
                }
                controlsView.animate().translationY(visible ? 0 : mControlsHeight).setDuration(mShortAnimTime);
            } else {
                // If the ViewPropertyAnimator APIs aren't
                // available, simply show or hide the in-layout UI
                // controls.
                controlsView.setVisibility(visible ? View.VISIBLE : View.GONE);
            }

            if (visible && AUTO_HIDE) {
                // Schedule a hide().
                delayedHide(AUTO_HIDE_DELAY_MILLIS);
            }
        }
    });

    // Set up the user interaction to manually show or hide the system UI.
    contentView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (TOGGLE_ON_CLICK) {
                mSystemUiHider.toggle();
            } else {
                mSystemUiHider.show();
            }
        }
    });

    // Upon interacting with UI controls, delay any scheduled hide()
    // operations to prevent the jarring behavior of controls going away
    // while interacting with the UI.
    findViewById(R.id.dummy_button).setOnTouchListener(mDelayHideTouchListener);
}

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);

    // Trigger the initial hide() shortly after the activity has been
    // created, to briefly hint to the user that UI controls
    // are available.
    delayedHide(100);
}

/**
 * Touch listener to use for in-layout UI controls to delay hiding the system UI. This is to prevent the jarring
 * behavior of controls going away while interacting with activity UI.
 */
View.OnTouchListener mDelayHideTouchListener = new View.OnTouchListener() {
    @Override
    public boolean onTouch(View view, MotionEvent motionEvent) {
        if (AUTO_HIDE) {
            delayedHide(AUTO_HIDE_DELAY_MILLIS);
        }
        return false;
    }
};

Handler mHideHandler = new Handler();
Runnable mHideRunnable = new Runnable() {
    @Override
    public void run() {
        mSystemUiHider.hide();
    }
};

/**
 * Schedules a call to hide() in [delay] milliseconds, canceling any previously scheduled calls.
 */
private void delayedHide(int delayMillis) {
    mHideHandler.removeCallbacks(mHideRunnable);
    mHideHandler.postDelayed(mHideRunnable, delayMillis);
}
 }

Answer 1

因为那是how it is documented to behave .使用 MMMM(四个 M)作为完整的月份名称。