Android 无法将带有 Picasso 和 ArrayAdapter 的图像加载到 SwipeFlingAdapterView

Question

Picasso 在不使用 ArrayAdapter 或 SwipFlingAdapterView 的情况下加载到布局中的 ImageView 时实际上是成功的，但无法加载到使用 ArrayAdapter 加载到 SwipeFlingAdapterView 的视图中。 我不知道有什么区别。

我已经使用 setImageResource() 成功地将图像加载到 SwipFlingAdapter 和 ArrayAdapter 并加载 R.MipMap.ic_launcher。

没有错误会破坏应用程序。

主要活动：

import ...

public class MainActivity extends AppCompatActivity {
    private Cards cards_data[];
    private MyArrayAdapter arrayAdapter;

    ListView listView;
    List<Cards> rowItems;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        rowItems = new ArrayList<Cards>();

        arrayAdapter = new MyArrayAdapter(this, R.layout.item, rowItems);

        SwipeFlingAdapterView flingContainer = (SwipeFlingAdapterView) findViewById(R.id.frame);

        flingContainer.setAdapter(arrayAdapter);
        flingContainer.setFlingListener(new SwipeFlingAdapterView.onFlingListener() {
            @Override
            public void removeFirstObjectInAdapter() {
                // this is the simplest way to delete an object from the Adapter (/AdapterView)
                Log.d("LIST", "removed object!");
                rowItems.remove(0);
                arrayAdapter.notifyDataSetChanged();
            }

            @Override
            public void onLeftCardExit(Object dataObject) {

                Cards obj = (Cards) dataObject;
                Toast.makeText(MatchingActivity.this, "Left!", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onRightCardExit(Object dataObject) {
                Cards obj = (Cards) dataObject;
                Toast.makeText(MatchingActivity.this, "Right!", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onAdapterAboutToEmpty(int itemsInAdapter) {
            }

            @Override
            public void onScroll(float scrollProgressPercent) {
            }
        });
    }

牌：

public class Cards {
    private String imageUrl;

    public Cards (String imageUrl) {
        this.profileImageUrl = imageUrl;
    }

    public String getImageUrl() {
        return imageUrl;
    }

    public void setImageUrl(String imageUrl) {
        this.imageUrl = imageUrl;
    }
}

自定义适配器：

import ...

public class MyArrayAdapter extends ArrayAdapter<Cards> {

    Context context;

    public MyArrayAdapter(Context context, int resourceId, List<Cards> items) {
        super(context, resourceId, items);
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        Cards card_item = getItem(position);

        if(convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.item, parent, false);
        }

        ImageView image = (ImageView) convertView.findViewById(R.id.image);

        Picasso.get().load(card_item.getImageUrl()).into(image);
        
        return convertView;
    }
}

XML 项目：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_gravity="center"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:paddingLeft="40sp"
    android:paddingRight="40sp"
    android:paddingTop="20sp"
    android:paddingBottom="20sp"
    android:outlineProvider="bounds"
    android:clipToPadding="false">

    <androidx.cardview.widget.CardView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        app:cardCornerRadius="4dp"
        android:elevation="2dp"
        android:id="@+id/cardView">

        <LinearLayout
            android:layout_gravity="center"
            android:layout_width="300dp"
            android:layout_height="350dp"
            android:orientation="vertical">

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="300dp"
                android:id="@+id/image"
                android:scaleType="cen

        </LinearLayout>

    </androidx.cardview.widget.CardView>

</LinearLayout>

Answer 1

Picasso 在不使用 ArrayAdapter 或 SwipFlingAdapterView 的情况下加载到布局中的 ImageView 时实际上是成功的，但无法加载到使用 ArrayAdapter 加载到 SwipeFlingAdapterView 的视图中。 我不知道有什么区别。

我已经使用 setImageResource() 成功地将图像加载到 SwipFlingAdapter 和 ArrayAdapter 并加载 R.MipMap.ic_launcher。

没有错误会破坏应用程序。

主要活动：

import ...

public class MainActivity extends AppCompatActivity {
    private Cards cards_data[];
    private MyArrayAdapter arrayAdapter;

    ListView listView;
    List<Cards> rowItems;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        rowItems = new ArrayList<Cards>();

        arrayAdapter = new MyArrayAdapter(this, R.layout.item, rowItems);

        SwipeFlingAdapterView flingContainer = (SwipeFlingAdapterView) findViewById(R.id.frame);

        flingContainer.setAdapter(arrayAdapter);
        flingContainer.setFlingListener(new SwipeFlingAdapterView.onFlingListener() {
            @Override
            public void removeFirstObjectInAdapter() {
                // this is the simplest way to delete an object from the Adapter (/AdapterView)
                Log.d("LIST", "removed object!");
                rowItems.remove(0);
                arrayAdapter.notifyDataSetChanged();
            }

            @Override
            public void onLeftCardExit(Object dataObject) {

                Cards obj = (Cards) dataObject;
                Toast.makeText(MatchingActivity.this, "Left!", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onRightCardExit(Object dataObject) {
                Cards obj = (Cards) dataObject;
                Toast.makeText(MatchingActivity.this, "Right!", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onAdapterAboutToEmpty(int itemsInAdapter) {
            }

            @Override
            public void onScroll(float scrollProgressPercent) {
            }
        });
    }

牌：

public class Cards {
    private String imageUrl;

    public Cards (String imageUrl) {
        this.profileImageUrl = imageUrl;
    }

    public String getImageUrl() {
        return imageUrl;
    }

    public void setImageUrl(String imageUrl) {
        this.imageUrl = imageUrl;
    }
}

自定义适配器：

import ...

public class MyArrayAdapter extends ArrayAdapter<Cards> {

    Context context;

    public MyArrayAdapter(Context context, int resourceId, List<Cards> items) {
        super(context, resourceId, items);
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        Cards card_item = getItem(position);

        if(convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.item, parent, false);
        }

        ImageView image = (ImageView) convertView.findViewById(R.id.image);

        Picasso.get().load(card_item.getImageUrl()).into(image);
        
        return convertView;
    }
}

XML 项目：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_gravity="center"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:paddingLeft="40sp"
    android:paddingRight="40sp"
    android:paddingTop="20sp"
    android:paddingBottom="20sp"
    android:outlineProvider="bounds"
    android:clipToPadding="false">

    <androidx.cardview.widget.CardView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        app:cardCornerRadius="4dp"
        android:elevation="2dp"
        android:id="@+id/cardView">

        <LinearLayout
            android:layout_gravity="center"
            android:layout_width="300dp"
            android:layout_height="350dp"
            android:orientation="vertical">

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="300dp"
                android:id="@+id/image"
                android:scaleType="cen

        </LinearLayout>

    </androidx.cardview.widget.CardView>

</LinearLayout>