小编Lea*_*ner的帖子

我正在使用Sugar ORM来持久保存和检索数据.下面是我用来存储和检索数据的代码.

Slider.deleteAll(Slider.class);
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, Constants.URL, jsonRepos.getSliderJobj(),
    new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            Log.d(Constants.MAINACTIVITY,response.toString());
            try {
                JSONArray sliderArray = response.getJSONArray("slider");
                    for (int i=0; i<sliderArray.length(); i++){
                        JSONObject sliderArrayJSONObject = sliderArray.getJSONObject(i);
                        String id = sliderArrayJSONObject.getString("id");
                        String albumId = sliderArrayJSONObject.getString("album_id");
                        String title = sliderArrayJSONObject.getString("title");
                        String imgUrl = sliderArrayJSONObject.getString("img_url");
                        String file = sliderArrayJSONObject.getString("file");
                        Log.d(Constants.MAINACTIVITY,file);
                        Log.d("Note", "saving");
                        Slider slider = new Slider(id, albumId, title , file, imgUrl);
                        slider.save();
                    }
                catch (JSONException e) {
                    e.printStackTrace();
                }
            }
            },
        appController.getErrorListener()
    ); …

我在重复当前歌曲的onCompletion听众中使用以下代码MediaPlayer。

if (isRepeat) {
                if (mMediaPlayer.isPlaying()) {
                    mMediaPlayer.stop();
                    mMediaPlayer.reset();
                }
                try {
                    mMediaPlayer.setDataSource(MainActivity.localTrackList.get(MainActivity.currentOffset).getPath());
                    mMediaPlayer.prepareAsync();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

但是我收到以下错误消息，

  at android.media.MediaPlayer._setDataSource(Native Method)
09-15 09:05:19.884 12545-12545/ W/System.err:     at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1115)
09-15 09:05:19.884 12545-12545/ W/System.err:     at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1100)
09-15 09:05:19.884 12545-12545/ W/System.err:     at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1079)
09-15 09:05:19.884 12545-12545/ W/System.err:     at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1028)

我怎样才能解决这个问题？

我试图动画"Loading ..."textview的三个点,如下所示,

Handler handler = new Handler();

        for (int i = 100; i <= 3500; i =i+100) {
            final int finalI = i;
            handler.postDelayed(new Runnable() {

                @Override
                public void run() {
                    if(finalI %300 == 0){
                        loadigText.setText("Loading.");
                    }else if(finalI %200 == 0){
                        loadigText.setText("Loading..");
                    }else if(finalI %100 == 0){
                        loadigText.setText("Loading...");
                    }
                }
            }, i);

问题是,1.我无法动画它,直到对话框可见.我无法降低三点动画的速度,

我怎样才能解决这个问题

我使用以下代码创建一个折叠工具栏,其中包含listview.

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/white"
    android:fitsSystemWindows="true">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="@dimen/detail_backdrop_height"
        android:fitsSystemWindows="true"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fitsSystemWindows="true"
            app:contentScrim="?attr/colorPrimary"
            app:expandedTitleMarginEnd="64dp"
            app:expandedTitleMarginStart="48dp"
            app:expandedTitleTextAppearance="@android:color/transparent"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <RelativeLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content">

                <ImageView
                    android:id="@+id/backdrop"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:fitsSystemWindows="true"
                    android:scaleType="centerCrop"
                    app:layout_collapseMode="parallax" />

                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerInParent="true"
                    android:gravity="center_horizontal"
                    android:orientation="vertical">

                    <TextView
                        android:id="@+id/love_music"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="@string/backdrop_title"
                        android:textColor="@android:color/white"
                        android:textSize="@dimen/backdrop_title" />

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="@string/backdrop_subtitle"
                        android:textColor="@android:color/white"
                        android:textSize="@dimen/backdrop_subtitle" />

                </LinearLayout>
            </RelativeLayout>

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="pin"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

        </android.support.design.widget.CollapsingToolbarLayout>

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/activity_experience"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_below="@+id/appbar"  />

</android.support.design.widget.CoordinatorLayout>

问题是,listview与appbar布局重叠,因此listview出现在appbarlayout中.布局activity_experience …