将数据从JSON对象传递到EditTexts和ImageView

Question

我正在从我通过REST制作的网站上检索数据。我有一个自定义布局：

<?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:id="@+id/activity_item_custom_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.marvinjason.art.ItemCustomLayout">

<android.support.v4.widget.SwipeRefreshLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/srl_activityItem">

</android.support.v4.widget.SwipeRefreshLayout>

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentTop="true"
    android:layout_alignParentStart="true">

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

        <ImageView
            app:srcCompat="@color/cardview_dark_background"
            android:id="@+id/imageView1"
            android:layout_alignParentTop="true"
            android:layout_alignParentStart="true"
            android:layout_height="150dp"
            android:layout_width="180dp" />

        <ImageView
            app:srcCompat="@color/cardview_dark_background"
            android:id="@+id/imageView3"
            android:layout_marginEnd="11dp"
            android:layout_width="70dp"
            android:layout_height="70dp"
            android:layout_alignParentTop="true"
            android:layout_alignParentEnd="true" />

        <ImageView
            app:srcCompat="@color/cardview_dark_background"
            android:id="@+id/imageView2"
            android:layout_width="70dp"
            android:layout_height="70dp"
            android:layout_alignParentTop="true"
            android:layout_toStartOf="@+id/imageView5"
            android:layout_marginEnd="11dp" />

        <TextView
            android:text="TextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/itemName"
            android:layout_marginTop="47dp"
            android:id="@+id/itemDescription"
            android:textSize="16sp" />

        <TextView
            android:text="TextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="176dp"
            android:id="@+id/itemName"
            android:textSize="20sp"
            android:layout_alignParentTop="true"
            android:layout_alignParentStart="true" />

        <ImageView
            app:srcCompat="@color/cardview_dark_background"
            android:id="@+id/imageView4"
            android:layout_width="70dp"
            android:layout_height="70dp"
            android:layout_alignBottom="@+id/imageView1"
            android:layout_alignStart="@+id/imageView2" />

        <ImageView
            app:srcCompat="@color/cardview_dark_background"
            android:id="@+id/imageView5"
            android:layout_width="70dp"
            android:layout_height="70dp"
            android:layout_alignTop="@+id/imageView4"
            android:layout_alignStart="@+id/imageView3" />

        <TextView
            android:text="TextView"
            android:layout_height="wrap_content"
            android:id="@+id/itemPrice"
            android:textSize="20sp"
            android:layout_width="wrap_content"
            android:layout_alignBaseline="@+id/itemName"
            android:layout_alignBottom="@+id/itemName"
            android:layout_alignParentEnd="true" />
    </RelativeLayout>
</ScrollView>

<TextView
    android:text="TextView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="105dp"
    android:id="@+id/itemSeller"
    android:layout_alignParentBottom="true"
    android:textSize="16sp" />

我正在做的是从网站链接中检索数据并将它们传递给EditTexts和ImageViews但是会发生什么是数据检索成功（我知道这是因为我有一个片段，它在那里工作正常）但是当我设置内容时它什么也没显示。我的猜测是将Edittexts的设置放在方法中，但我不知道该怎么做。只是附加信息：在开始时，有一个片段类。它包含项目的列表视图，一旦点击它应该显示项目的详细信息（这是这个类）这是我的活动：

public class ItemCustomLayout extends AppCompatActivity {
    private SwipeRefreshLayout swipeRefreshLayout;
    private JSONArray jsonArray;
    private static Item items;
    private static boolean isPremium = false;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_item_custom_layout);

        swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.srl_activityItem);
        final SwipeRefreshLayout.OnRefreshListener onRefreshListener = new SwipeRefreshLayout.OnRefreshListener()
        {
           @Override
            public void onRefresh()
            {
            if (!Utility.isConnected(ItemCustomLayout.this))
            {
                Toast.makeText(ItemCustomLayout.this, "No internet connection!", Toast.LENGTH_LONG).show();
            }

            fetchData();
        }
    };

    swipeRefreshLayout.setOnRefreshListener(onRefreshListener);

    swipeRefreshLayout.post(new Runnable()
    {
        @Override
        public void run()
        {
            swipeRefreshLayout.setRefreshing(true);
            onRefreshListener.onRefresh();
        }
    });

    Picasso.with(ItemCustomLayout.this).load(items.imageUrl).into(((ImageView) findViewById(R.id.imageView1)));
    Picasso.with(ItemCustomLayout.this).load(items.imageUrl).into(((ImageView) findViewById(R.id.imageView2)));
    Picasso.with(ItemCustomLayout.this).load(items.imageUrl).into(((ImageView) findViewById(R.id.imageView3)));
    Picasso.with(ItemCustomLayout.this).load(items.imageUrl).into(((ImageView) findViewById(R.id.imageView4)));
    Picasso.with(ItemCustomLayout.this).load(items.imageUrl).into(((ImageView) findViewById(R.id.imageView5)));
    ((TextView) findViewById(R.id.itemName)).setText(items.name);
    ((TextView) findViewById(R.id.itemPrice)).setText(String.format("Php %.2f", items.price));
    ((TextView) findViewById(R.id.itemDescription)).setText(items.description);
    ((TextView) findViewById(R.id.itemSeller)).setText(items.seller);


}

public void fetchData()
{
    new AsyncTask(){

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
        }

        @Override
        protected Object doInBackground(Object[] objects) {
            RestApi rest = new RestApi(ItemCustomLayout.this);
            jsonArray = rest.fetchJSONArray(*link*);

            return null;
        }

        @Override
        protected void onPostExecute(Object o) {
            super.onPostExecute(o);
            try {
                items = new Item();
                int id = (int) getIntent().getExtras().get("id");
                items.imageUrl = jsonArray.getJSONObject(id).getString("image_url");
                items.name = jsonArray.getJSONObject(id).getString("name");
                items.price = Double.parseDouble(jsonArray.getJSONObject(id).getString("price"));
                items.description = jsonArray.getJSONObject(id).getString("description");
                items.seller = "Company A";

            }
            catch (Exception ex)
            {
                Log.d("Error", ex.toString());
            }
            swipeRefreshLayout.setRefreshing(false);
        }
    }.execute();
}

private class Item
{
    public int id;
    public String name;
    public double price;
    public String description;
    public String seller;
    public String imageUrl;
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    if (isPremium) {
        getMenuInflater().inflate(R.menu.itemmenupremium, menu);
    }
    else {
        getMenuInflater().inflate(R.menu.itemmenubasic, menu);
    }
    return true;
}

}

任何帮助将不胜感激！

Answer 1

你的fetchData（）函数是异步运行的，所以当你尝试在onCreate（）中填充你的ImageViews和TextViews时，fetchData（）可能还没有完成它的任务。

我认为解决方案是在try-block的末尾调用从onPostExecute（）填充ImageViews和TextViews的语句。

Answer 2

使用此

public class ItemCustomLayout extends AppCompatActivity {
    private SwipeRefreshLayout swipeRefreshLayout;

    private static boolean isPremium = false;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_item_custom_layout);

        swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.srl_activityItem);
        final SwipeRefreshLayout.OnRefreshListener onRefreshListener = new SwipeRefreshLayout.OnRefreshListener()
        {
           @Override
            public void onRefresh()
            {
            if (!Utility.isConnected(ItemCustomLayout.this))
            {
                Toast.makeText(ItemCustomLayout.this, "No internet connection!", Toast.LENGTH_LONG).show();
            }

            fetchData();
        }
    };

    swipeRefreshLayout.setOnRefreshListener(onRefreshListener);

    swipeRefreshLayout.post(new Runnable()
    {
        @Override
        public void run()
        {
            swipeRefreshLayout.setRefreshing(true);
            onRefreshListener.onRefresh();
        }
    });

}

public void fetchData()
{
    new AsyncTask(){
        private JSONArray jsonArray;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
        }

        @Override
        protected Object doInBackground(Object[] objects) {
            RestApi rest = new RestApi(ItemCustomLayout.this);
            jsonArray = rest.fetchJSONArray(*link*);

            return null;
        }

        @Override
        protected void onPostExecute(Object o) {
            super.onPostExecute(o);
            try {
                Items items = new Item();
                int id = (int) getIntent().getExtras().get("id");
                items.imageUrl = jsonArray.getJSONObject(id).getString("image_url");
                items.name = jsonArray.getJSONObject(id).getString("name");
                items.price = Double.parseDouble(jsonArray.getJSONObject(id).getString("price"));
                items.description = jsonArray.getJSONObject(id).getString("description");
                items.seller = "Company A";

                setData(items);
            }
            catch (Exception ex)
            {
                Log.d("Error", ex.toString());
            }
            swipeRefreshLayout.setRefreshing(false);
        }
    }.execute();
}

private class Item
{
    public int id;
    public String name;
    public double price;
    public String description;
    public String seller;
    public String imageUrl;
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    if (isPremium) {
        getMenuInflater().inflate(R.menu.itemmenupremium, menu);
    }
    else {
        getMenuInflater().inflate(R.menu.itemmenubasic, menu);
    }
    return true;
}

private void setData(Item items)
{
    Picasso.with(ItemCustomLayout.this).load(items.imageUrl).into(((ImageView) findViewById(R.id.imageView1)));
    Picasso.with(ItemCustomLayout.this).load(items.imageUrl).into(((ImageView) findViewById(R.id.imageView2)));
    Picasso.with(ItemCustomLayout.this).load(items.imageUrl).into(((ImageView) findViewById(R.id.imageView3)));
    Picasso.with(ItemCustomLayout.this).load(items.imageUrl).into(((ImageView) findViewById(R.id.imageView4)));
    Picasso.with(ItemCustomLayout.this).load(items.imageUrl).into(((ImageView) findViewById(R.id.imageView5)));
    ((TextView) findViewById(R.id.itemName)).setText(items.name);
    ((TextView) findViewById(R.id.itemPrice)).setText(String.format("Php %.2f", items.price));
    ((TextView) findViewById(R.id.itemDescription)).setText(items.description);
    ((TextView) findViewById(R.id.itemSeller)).setText(items.seller);



}