将Volley图像作为下一个活动背景图像传递

Question

这是一个简单的问题，但却使我感到困惑。我有第一个活动和详细信息活动，如下所示。

第一个活动： 第二个活动： 第一个活动作为一个使用Volley下载JSON数据的列表视图，我能够将标题和图片发送到详细信息活动，但现在我想将传递的图片设置为详细信息活动的背景图片。以下是我的第一个活动代码：

MainActivity:

public class MainActivity extends Activity {
// Log tag
private static final String TAG = MainActivity.class.getSimpleName();

// Movies json url
private static final String url = "http://api.androidhive.info/json/movies.json";
private ProgressDialog pDialog;
private List<Movie> movieList = new ArrayList<Movie>();
private ListView listView;
private CustomListAdapter adapter;

private static String Title="title";
private static String bitmap="thumbnailUrl";


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

    Intent newActivity2=new Intent();
    setResult(RESULT_OK, newActivity2);

    listView = (ListView) findViewById(R.id.list);
    adapter = new CustomListAdapter(this, movieList);
    listView.setAdapter(adapter);

    pDialog = new ProgressDialog(this);
    // Showing progress dialog before making http request
    pDialog.setMessage("Loading...");
    pDialog.show();

    // changing action bar color
    getActionBar().setBackgroundDrawable(
            new ColorDrawable(Color.parseColor("#1b1b1b")));

    // Creating volley request obj
    JsonArrayRequest movieReq = new JsonArrayRequest(url,
            new Response.Listener<JSONArray>() {
                @Override
                public void onResponse(JSONArray response) {
                    Log.d(TAG, response.toString());
                    pDialog.dismiss();

                    // Parsing json
                    for (int i = 0; i < response.length(); i++) {
                        try {

                            JSONObject obj = response.getJSONObject(i);
                            Movie movie = new Movie();
                            movie.setTitle(obj.getString("title"));
                            movie.setThumbnailUrl(obj.getString("image"));
                            movie.setRating(((Number) obj.get("rating"))
                                    .doubleValue());
                            movie.setYear(obj.getInt("releaseYear"));

                            // Genre is json array
                            JSONArray genreArry = obj.getJSONArray("genre");
                            ArrayList<String> genre = new ArrayList<String>();
                            for (int j = 0; j < genreArry.length(); j++) {
                                genre.add((String) genreArry.get(j));
                            }
                            movie.setGenre(genre);

                            // adding movie to movies array
                            movieList.add(movie);

                        } catch (JSONException e) {
                            e.printStackTrace();
                        }

                    }

                    // notifying list adapter about data changes
                    // so that it renders the list view with updated data
                    adapter.notifyDataSetChanged();
                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    if (error instanceof NoConnectionError){
                        Toast.makeText(getBaseContext(), "Bummer..There's No Internet connection!", Toast.LENGTH_LONG).show();

                    }

                }
            });

    // Adding request to request queue
    AppController.getInstance().addToRequestQueue(movieReq);
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            // TODO Auto-generated method stub
            String name = ((TextView) view.findViewById(R.id.title)).getText().toString();

            bitmap = ((Movie)movieList.get(position)).getThumbnailUrl();
            Intent intent = new Intent(MainActivity.this, Detail.class);    
            intent.putExtra(Title, name);
            intent.putExtra("images", bitmap);

            startActivity(intent);
        }

    });
}



@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

这是详情页活动:

public class Detail extends Activity{
private static String Title = "title";

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.detail);
    getActionBar().hide();


    Intent i = getIntent();
    ImageLoader imageLoader = AppController.getInstance().getImageLoader();
    String name = i.getStringExtra(Title);
    String bitmap = i.getStringExtra("images");
    NetworkImageView thumbNail = (NetworkImageView) findViewById(R.id.thumbnail);
    thumbNail.setImageUrl(bitmap, imageLoader);
    TextView lblname = (TextView) findViewById(R.id.name_label);

    lblname.setText(name);
}

public void onClickHandler(View v){
    switch(v.getId()){
    case R.id.thumbnail:startActivity(new Intent(this,MainActivity.class));
    }
}

}

如果需要的话，我可以上传更多的代码。

自定义列表适配器：

public class CustomListAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private List<Movie> movieItems;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();

public CustomListAdapter(Activity activity, List<Movie> movieItems) {
    this.activity = activity;
    this.movieItems = movieItems;
}

@Override
public int getCount() {
    return movieItems.size();
}

@Override
public Object getItem(int location) {
    return movieItems.get(location);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    if (inflater == null)
        inflater = (LayoutInflater) activity
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    if (convertView == null)
        convertView = inflater.inflate(R.layout.list_row, null);

    if (imageLoader == null)
        imageLoader = AppController.getInstance().getImageLoader();
    NetworkImageView thumbNail = (NetworkImageView) convertView
            .findViewById(R.id.thumbnail);
    TextView title = (TextView) convertView.findViewById(R.id.title);
    TextView rating = (TextView) convertView.findViewById(R.id.rating);
    TextView genre = (TextView) convertView.findViewById(R.id.genre);
    TextView year = (TextView) convertView.findViewById(R.id.releaseYear);

    // getting movie data for the row
    Movie m = movieItems.get(position);

    // thumbnail image
    thumbNail.setImageUrl(m.getThumbnailUrl(), imageLoader);

    // title
    title.setText(m.getTitle());

    // rating
    rating.setText("Rating: " + String.valueOf(m.getRating()));

    // genre
    String genreStr = "";
    for (String str : m.getGenre()) {
        genreStr += str + ", ";
    }
    genreStr = genreStr.length() > 0 ? genreStr.substring(0,
            genreStr.length() - 2) : genreStr;
    genre.setText(genreStr);

    // release year
    year.setText(String.valueOf(m.getYear()));

    return convertView;
}

}

和 detail.xml

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

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:background="#ffffff" >

    
    <com.android.volley.toolbox.NetworkImageView
    android:id="@+id/thumbnail" 
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="42dp"
    tools:ignore="ContentDescription"/>
    
    <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical" >
    
    <TextView
        android:id="@+id/name_label"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:divider="@color/list_divider"
        android:dividerHeight="1dp" />
    </LinearLayout>

   
 </RelativeLayout>

我对这方面是个新手，所以任何帮助都将不胜感激。非常感谢！

- Wang Jian

Answer 1

这里来啦！

MainActivity: 内部：

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        // your code
        BitmapDrawable bd = (BitmapDrawable) ((NetworkImageView) view.findViewById(R.id.thumbnail))
                .getDrawable();
        Bitmap bitmap=bd.getBitmap();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        bd.getBitmap().compress(Bitmap.CompressFormat.PNG, 100, baos); 
        byte[] imgByte = baos.toByteArray();

        Intent intent = new Intent(MainActivity.this, Detail.class);
        intent.putExtra("image", imgByte);
        // any other extra you need to pass
        startActivity(intent);
    }
}

详细信息如下：

Bundle extras = getIntent().getExtras();
byte[] b = extras.getByteArray("image");

Bitmap bmp = BitmapFactory.decodeByteArray(b, 0, b.length);
BitmapDrawable background = new BitmapDrawable(bmp);
findViewById(R.id.root_layout).setBackgroundDrawable(background);

在 detail.xml 文件中:

给你的 RelativeLayout 分配一个 id：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/root_layout"

- Mithun

---

非常感谢您的回答，对我帮助很大！但是我正在尝试将图像放置在下一个活动中的ImageView中，而不是作为背景。请查看我的问题：http://stackoverflow.com/questions/31637386/how-to-send-an-image-downloaded-by-volley-to-the-next-activity/31637539?noredirect=1#comment51221644_31637539 - Steve Kamau

Answer 2

在你的XML中，为根RelativeLayout添加一个id，并在你的Detail Activity中调用它。

然后调用relativeLayout.setBackground（从其他Activity传入drawable）;

- Joshua Guzman

---

但是你不能在活动之间发送可绘制对象！请看我的答案，你需要先获取位图，然后将其转换为字节数组。 - Mithun

Answer 3

将Volley图像作为下一个活动的背景图像传递，这很好用： 从ListView加载图像到下一个Activity

- pulak