小编Ale*_*exS的帖子

当键盘出现并隐藏工具栏（FrameLayout）时，我的屏幕大小调整到顶部，我只需将聊天项目滚动到顶部并将框架布局保持在顶部。我尝试了谷歌和SO的一些例子，但对我没有任何帮助。

<activity
        android:name=".screen.workshiftscreen.WorkShiftActivity"
        android:launchMode="singleTop"
        android:windowSoftInputMode="adjustPan"
        android:screenOrientation="portrait" />

经过一些编辑后我的片段布局：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="?attr/bg_second"
    android:orientation="vertical">

    <FrameLayout
        android:id="@+id/title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginBottom="@dimen/space_large_s"
        android:background="?attr/bg_main"
        android:padding="@dimen/space_small_m">

        <TextView
            *params* />

        <ImageView
            *params* />
    </FrameLayout>

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipe_refresh_chat"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@id/edit_bar"
        android:layout_below="@+id/title">

            <android.support.v7.widget.RecyclerView
                android:id="@+id/messages"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:paddingLeft="@dimen/space_medium_l"
                android:paddingRight="@dimen/space_medium_l"
                android:scrollbars="vertical" />
    </android.support.v4.widget.SwipeRefreshLayout>

    <LinearLayout
        android:id="@+id/edit_bar"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:layout_alignParentBottom="true"
        android:orientation="vertical"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent">

        <View
            *params* />

        <LinearLayout
            *params*>

            <EditText
                android:id="@+id/message_input"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:layout_marginLeft="16dp"
                android:layout_marginRight="16dp"
                android:layout_weight="1"
                android:background="@android:color/transparent"
                android:hint="@string/prompt_message"
                android:imeActionId="@+id/send"
                android:imeActionLabel="@string/action_send"
                android:imeOptions="actionSend"
                android:maxLines="6"
                tools:ignore="Autofill,InvalidImeActionId,TextFields" />

            <ImageButton …

我想在 Android Room 中使用预先填充的数据库。我找到了一种通过使用回调来实现它的方法，并填充了数据库文件。但是出了点问题，我确定数据库复制正常，但在设备监视器和android模拟器中它仍然为空。你能帮我么

public abstract class AppDatabase extends RoomDatabase {
private static AppDatabase INSTANCE;
private static final String DB_NAME = "base.db";
static Context ctx;

public abstract Dao dao();

public static AppDatabase getDatabase(Context context) {
    if (INSTANCE == null) {
        ctx = context;
        synchronized (AppDatabase.class) {
            if (INSTANCE == null) {
                INSTANCE = Room.databaseBuilder(context,
                        AppDatabase.class, DB_NAME)
                        .allowMainThreadQueries()
                        .addCallback(rdc)
                        .build();
            }
        }
    }
    return INSTANCE;
}

private static RoomDatabase.Callback rdc = new RoomDatabase.Callback() {
    public void onCreate(SupportSQLiteDatabase db) {

        new PopulateDbAsync(INSTANCE, …

下午好。我在应用程序中创建了一个现有的数据库。我想通过 Room 对她讲话，但出现错误IllegalArgumentException: Cannot provide null context for the database.。我的代码如下所示：

    @Database(entities = {Series.class}, version = 1, exportSchema = false)
    public abstract class AppDatabase extends RoomDatabase {
    private static AppDatabase INSTANCE;
    private static final String DB_NAME = "base.db";

    public abstract CymbalDao cymbalDao();

    public static AppDatabase getDatabase(final Context context) {
        if (INSTANCE == null) {
            synchronized (AppDatabase.class) {
                if (INSTANCE == null) {
                    INSTANCE = Room.databaseBuilder(context,
                            AppDatabase.class, DB_NAME)
                            .allowMainThreadQueries()
                            .build();
                }
            }
        }
        return INSTANCE;
    }

}

数据库位置：

..\src\main\assets\base.db

我想知道我做错了什么，也许能听到一些提示，谢谢！ …