小编Lau*_*ntY的帖子

我想用AppWidgetProvider 实现Android架构组件.

我不确定将Widget LifeCycle正确映射到LifeCycle事件.

我创建了一个BaseAppWidgetProvider以供我的小部件扩展:

/**
 * Base class for {@link BaseAppWidgetProvider} to manage {@link Lifecycle}
 */

public abstract class BaseAppWidgetProvider extends AppWidgetProvider implements LifecycleOwner {
    private final AppWidgetProviderLifecycleDispatcher mDispatcher = new AppWidgetProviderLifecycleDispatcher(this);

    public BaseAppWidgetProvider(){
        mDispatcher.onConstructor();
    }

    @CallSuper
    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        mDispatcher.onUpdate();
        super.onUpdate(context, appWidgetManager, appWidgetIds);
    }

    @CallSuper
    @Override
    public void onDeleted(Context context, int[] appWidgetIds) {
        mDispatcher.onDeleted();
        super.onDeleted(context, appWidgetIds);
    }

    @CallSuper
    @Override
    public void onEnabled(Context context) {
        mDispatcher.onEnabled();
        super.onEnabled(context);
    } …

用什么代替surfaceholder.settype？

PreviewHolder = CameraPreview.getHolder();
       PreviewHolder.addCallback(this);
       if(Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB)

        PreviewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

我尝试转换SQL为LINK查询

我试试这个

SQL 询问

Select name, count(*) from tblVehicles
WHERE MID = 23065 and name<> '' Group By name

LINQ 询问

var re = (from vehvoila in DB.tblVehicles
             where vehvoila.MID='23065' && vehvoila.name
             group vehvoila by new{vehvoila.name} into g
             select new
             {
                 g.Key.name,
                 cnt=g.Select(t=>t.name).Count()
             });

我如何使用<> LINQ？

我有这个错误：

无法解析方法“put(java.lang.String, java.util.Date)”

在下面的代码中：

lsd和nsd是数据类型为 DATE 的列名。

public void onCreate(SQLiteDatabase db)
{
    String query="CREATE TABLE"+c_tablename+"(c_id int AUTO_INCREMENT primary key,name varchar(20),contact double ,address varchar(50)," +
            "bike_number varchar(16),bike_type varchar(10),lsd date,nsd date,lwd varchar(100),cost int,message varchar(100))";
    db.execSQL(query);

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
    String query= "DROP TABLE IF EXIST "+c_tablename;
    String query2="DROP TABLE IF EXIST "+h_tablename;
    db.execSQL(query);
    db.execSQL(query2);

    onCreate(db);
}

public void  saveData(String name , int contact , String address , String bike_number , String bike_type …