Question

我的应用将一些项目加载到回收站视图中，并为每个项目设置onClickListeners。两个小时前我遇到了Picasso，Glide或asyncronous任务的问题，所有这些都加载了前2或4个图像，然后开始随机加载（只有图像，textview和项目本身很好）并且有时会闪烁在不同的图像之间。

我已经开始更改我的代码以尝试修复它，现在，回收站视图无法加载任何内容。

有人可以看看我的代码吗？我只触及了这两个班级。

编辑：这就是它现在的样子http://imgur.com/a/4rDLU

Edit2：使用debug，程序永远不会进入onBindViewHolder或onCreateViewHolder方法

主要活动

public class Principal extends AppCompatActivity implements AppBarLayout.OnOffsetChangedListener{
    public static LugaresBD lugares;
    private RecyclerView recyclerView;
    public static AdaptadorLugares adaptador;
    private android.support.v7.widget.RecyclerView.LayoutManager layoutManager;
    static final int RESULTADO_PREFERENCIAS = 0;
    static public ArrayList<Lugar> arrayLugares = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        lugares = new LugaresBD(this);
        setContentView(R.layout.activity_main);

        recyclerView = (RecyclerView)
                findViewById(R.id.recycler_view);
        adaptador = new AdaptadorLugares(this, lugares, lugares.extraeCursor());
        recyclerView.setAdapter(adaptador);
        layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);


        adaptador.setOnItemClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(Principal.this,
                        VistaLugarActivity.class);
                i.putExtra("id", arrayLugares.get(recyclerView.getChildAdapterPosition(v)).get_id());
                startActivityForResult(i, 1433);
            }
        });
    }
}

适配器

public class AdaptadorLugares extends RecyclerView.Adapter<AdaptadorLugares.ViewHolder> {
        protected Cursor cursor;
        protected Lugares lugares; //Lugares a mostrar
        protected LayoutInflater inflador; //Crea Layouts con el XML
        protected Context contexto; //Lo necesitamos para el inflador
        protected View.OnClickListener onClickListener;
        public static ImageView foto;
        AsyncTask<String,Void,Bitmap> task = null;
        Bitmap mBitmap;

    public AdaptadorLugares(Context contexto, Lugares lugares, Cursor cursor){
        this.cursor = cursor;
        this.contexto = contexto;
        this.lugares = lugares;
        inflador = (LayoutInflater) contexto.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }



        public static class ViewHolder extends RecyclerView.ViewHolder {
            public TextView nombre;

            public ViewHolder(View itemView) {
                super(itemView);
                nombre = (TextView) itemView.findViewById(R.id.nombrecito);
                foto = (ImageView) itemView.findViewById(R.id.foto);

            }
        }


        @Override
        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            // Inflamos la vista desde el xml
            View v = inflador.inflate(R.layout.elemento_lista, parent,
                    false);
            v.setOnClickListener(onClickListener);
            return new ViewHolder(v);
        }


        @Override
        public void onBindViewHolder(ViewHolder holder, int posicion) {
            Lugar lugar = lugares.elemento(posicion);

            holder.nombre.setText(lugar.get_id() + lugar.getNombre());
            Picasso.with(contexto).load(lugar.getImage()).into(foto);



        }



        @Override
        public int getItemCount() {
            return lugares.tamanyo();
        }

        public void setOnItemClickListener(View.OnClickListener onClickListener) {
            this.onClickListener = onClickListener;
        }

        public Cursor getCursor(){
            return cursor;
        }

        public void setCursor(Cursor cursor){
            this.cursor = cursor;
        }

        public Lugar lugarPosicion(int posicion){
            cursor.moveToPosition(posicion);
            return LugaresBD.extraeLugar(cursor);
        }

        public int idPosicion(int posicion){
            cursor.moveToPosition((posicion));
            return cursor.getInt(0);
        }
}

谢谢。

Edit3：

活动主要xml

<android.support.design.widget.CoordinatorLayout
    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"
    tools:ignore="RtlHardcoded"
    >

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

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/main.collapsing"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"
            >

            <ImageView
                android:id="@+id/main.imageview.placeholder"
                android:layout_width="match_parent"
                android:layout_height="300dp"
                android:scaleType="centerCrop"
                android:src="@drawable/street_view"
                android:tint="#11000000"
                app:layout_collapseMode="parallax"
                app:layout_collapseParallaxMultiplier="0.9"
                />

            <FrameLayout
                android:id="@+id/main.framelayout.title"
                android:layout_width="match_parent"
                android:layout_height="100dp"
                android:layout_gravity="bottom|center_horizontal"
                android:background="@color/primary"
                android:orientation="vertical"
                app:layout_collapseMode="parallax"
                app:layout_collapseParallaxMultiplier="0.3"
                >

                <LinearLayout
                    android:id="@+id/main.linearlayout.title"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:orientation="vertical"
                    >

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_gravity="center_horizontal"
                        android:gravity="bottom|center"
                        android:text="ITEMS"
                        android:textColor="@android:color/white"
                        android:textSize="30sp"
                        />

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_gravity="center_horizontal"
                        android:layout_marginTop="4dp"
                        android:text="My store STORE"
                        android:textColor="@android:color/white"
                        />

                </LinearLayout>
            </FrameLayout>
        </android.support.design.widget.CollapsingToolbarLayout>
    </android.support.design.widget.AppBarLayout>


    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="none"
        android:layout_marginTop="30dp"
        android:fitsSystemWindows="true"
        app:behavior_overlapTop="30dp"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"

        >

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


    </RelativeLayout>

    <android.support.v7.widget.Toolbar
        android:id="@+id/main.toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@color/primary"
        app:layout_anchor="@id/main.framelayout.title"
        app:theme="@style/ThemeOverlay.AppCompat.Dark"
        app:title=""
        >

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:orientation="horizontal"
            >

            <Space
                android:layout_width="@dimen/image_final_width"
                android:layout_height="@dimen/image_final_width"
                />

            <TextView
                android:id="@+id/main.textview.title"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_marginLeft="8dp"
                android:gravity="center_vertical"
                android:text="My Store"
                android:textColor="@android:color/white"
                android:textSize="20sp"
                />

        </LinearLayout>
    </android.support.v7.widget.Toolbar>

    <de.hdodenhof.circleimageview.CircleImageView
        android:id="@+id/circleView"
        android:layout_width="@dimen/image_width"
        android:layout_height="@dimen/image_width"
        android:layout_gravity="center_horizontal"
        android:src="@drawable/logo"
        app:border_color="@android:color/white"
        app:border_width="2dp"
        app:finalHeight="@dimen/image_final_width"
        app:finalYPosition="2dp"
        app:layout_behavior="com.example.dam202.mislugares.AvatarImageBehavior"
        app:startHeight="2dp"
        app:startToolbarPosition="2dp"
        app:startXPosition="2dp"
        />
</android.support.design.widget.CoordinatorLayout>

content_principal.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:weightSum="10"
    android:theme="@style/ThemeOverlay.AppCompat.Light">
<android.support.v7.widget.RecyclerView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/recycler_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context=".Principal"
    tools:showIn="@layout/activity_main"
    />


</LinearLayout>

Answer 1

设置适配器并设置recyclerview的线性布局时，尝试翻转订单代码。因为如果没有布局管理器，RecyclerView将无法工作。所以我们必须首先设置线性布局，然后设置适配器。它会是这样的：

layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
adaptador = new AdaptadorLugares(this, lugares, lugares.extraeCursor());
recyclerView.setAdapter(adaptador);

然后尝试将public ImageView foto;放到ViewHolder类中。所以它会是这样的：

public static class ViewHolder extends RecyclerView.ViewHolder {
    public ImageView foto;
    public TextView nombre;

    public ViewHolder(View itemView) {
        super(itemView);
        nombre = (TextView) itemView.findViewById(R.id.nombrecito);
        foto = (ImageView) itemView.findViewById(R.id.foto);
     }
}

并使用holder内的onBindViewHolder()。所以它会是这样的：

    @Override
    public void onBindViewHolder(ViewHolder holder, int posicion) {
        Lugar lugar = lugares.elemento(posicion);

        holder.nombre.setText(lugar.get_id() + lugar.getNombre());
        Picasso.with(contexto).load(lugar.getImage()).into(holder.foto);
    }

确保getItemCount()返回大于零

RecyclerView不会加载XML

1 个答案: