我正在使用 eclipse 。 基本上我想要实现的是，我有一个 gridView，它使用 JSON 动态地从 mysql 数据库中获取图像。 现在，我想将它们显示为 coverflow View ，而不是 gridview。
我在互联网上搜索过，但找不到任何动态图像的库或示例，我只找到了存储在应用程序本身而不是外部数据库中的静态图像。
我的代码如下:-
MainActivity.java:-
public class MainActivity extends Activity implements OnClickListener {
// Log tag
private static final String TAG = MainActivity.class.getSimpleName();
// Movies json url
private static final String url = "http://eventassociate.com/wedding/photomania";
private ProgressDialog pDialog;
private List<Movie> movieList = new ArrayList<Movie>();
private PullToRefreshGridView mPullRefreshGridView;
private GridView gridView;
private CustomListAdapter adapter;
ImageButton blackcapture;
private static int RESULT_LOAD_IMAGE = 1;
String picturePath;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.gallary_activity_main);
overridePendingTransition(R.anim.push_down_in, R.anim.push_down_out);
mPullRefreshGridView = (PullToRefreshGridView) findViewById(R.id.list);
gridView = mPullRefreshGridView.getRefreshableView();
mPullRefreshGridView.setOnRefreshListener(new OnRefreshListener2<GridView>() {
@Override
public void onPullDownToRefresh(PullToRefreshBase<GridView> refreshView) {
adapter.notifyDataSetChanged();
gridView.setAdapter(adapter);
gridView.invalidateViews();
mPullRefreshGridView.onRefreshComplete();
}
adapter = new CustomListAdapter(this, movieList);
gridView.setAdapter(adapter);
gridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
Movie m5 = movieList.get(position);
Intent i = new Intent(getApplicationContext(),
FullImageActivity.class);
i.putExtra("movieobject", m5);
startActivity(i);
}
});
适配器类:-
public class CustomListAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
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.gallary_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);
// getting movie data for the row
Movie m = movieItems.get(position);
// thumbnail image
thumbNail.setImageUrl(m.getThumbnailUrl(), imageLoader);
// title
title.setText(m.getTitle());
return convertView;
}
电影.java:-
public class Movie implements Parcelable{
private String title,thumbnailUrl;
public Movie() {
// TODO Auto-generated constructor stub
}
public Movie(String name, String thumbnailUrl
) {
this.title = name;
this.thumbnailUrl = thumbnailUrl;
}
public String getTitle() {
return title;
}
public void setTitle(String name) {
this.title = name;
}
public String getThumbnailUrl() {
return thumbnailUrl;
}
public void setThumbnailUrl(String thumbnailUrl) {
this.thumbnailUrl = "http://eventassociate.com/wedding/"+thumbnailUrl;
}
// Parcelling part
public Movie(Parcel in){
String[] data = new String[2];
in.readStringArray(data);
this.title = data[0];
this.thumbnailUrl = data[1];
}
@Override
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeStringArray(new String[] {this.title,
this.thumbnailUrl,
});
}
public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {
public Movie createFromParcel(Parcel in) {
return new Movie(in);
}
public Movie[] newArray(int size) {
return new Movie[size];
}
};
我成功地将其实现为 GridView ，但我在将其实现为 coverflow 设计或类似设计时遇到了麻烦。 我在网上搜索并找到了这段代码，但仅适用于静态图像:-
public class SimpleExample extends Activity {
// =============================================================================
// Child views
// =============================================================================
private FancyCoverFlow fancyCoverFlow;
// =============================================================================
// Supertype overrides
// =============================================================================
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.fancyCoverFlow = (FancyCoverFlow) this.findViewById(R.id.fancyCoverFlow);
this.fancyCoverFlow.setAdapter(new FancyCoverFlowSampleAdapter());
this.fancyCoverFlow.setUnselectedAlpha(1.0f);
this.fancyCoverFlow.setUnselectedSaturation(0.0f);
this.fancyCoverFlow.setUnselectedScale(0.5f);
this.fancyCoverFlow.setSpacing(50);
this.fancyCoverFlow.setMaxRotation(0);
this.fancyCoverFlow.setScaleDownGravity(0.2f);
this.fancyCoverFlow.setActionDistance(FancyCoverFlow.ACTION_DISTANCE_AUTO);
}
// =============================================================================
// Private classes
// =============================================================================
适配器.java:-
public class FancyCoverFlowSampleAdapter extends FancyCoverFlowAdapter {
// =============================================================================
// Private members
// =============================================================================
private int[] images = {R.drawable.image1, R.drawable.image2, R.drawable.image3, R.drawable.image4, R.drawable.image5, R.drawable.image6,};
// =============================================================================
// Supertype overrides
// =============================================================================
@Override
public int getCount() {
return images.length;
}
@Override
public Integer getItem(int i) {
return images[i];
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getCoverFlowItem(int i, View reuseableView, ViewGroup viewGroup) {
ImageView imageView = null;
if (reuseableView != null) {
imageView = (ImageView) reuseableView;
} else {
imageView = new ImageView(viewGroup.getContext());
imageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
imageView.setLayoutParams(new FancyCoverFlow.LayoutParams(300, 400));
}
imageView.setImageResource(this.getItem(i));
return imageView;
}
有人可以帮助我解决我的问题吗？ 谢谢。
我使用 coverflow 的最终代码:-
主要 Activity :-
public class MainActivity extends Activity implements OnClickListener {
// Log tag
private static final String TAG = album.MainActivity.class.getSimpleName();
// Movies json url
private static final String url = "http://eventassociate.com/wedding/androidadminimages";
private ProgressDialog pDialog;
private List<Moviealbum> movieList = new ArrayList<Moviealbum>();
private FancyCoverFlow fancyCoverFlow;
private CustomListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.album_activity_main);
overridePendingTransition(R.anim.push_down_in, R.anim.push_down_out);
this.fancyCoverFlow = (FancyCoverFlow) this.findViewById(R.id.list);
adapter = new CustomListAdapter(this, movieList);
this.fancyCoverFlow.setAdapter(new CustomListAdapter(this, movieList));
this.fancyCoverFlow.setUnselectedAlpha(1.0f);
this.fancyCoverFlow.setUnselectedSaturation(0.0f);
this.fancyCoverFlow.setUnselectedScale(0.5f);
this.fancyCoverFlow.setSpacing(50);
this.fancyCoverFlow.setMaxRotation(0);
this.fancyCoverFlow.setScaleDownGravity(0.2f);
this.fancyCoverFlow.setActionDistance(FancyCoverFlow.ACTION_DISTANCE_AUTO);
fancyCoverFlow.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
Moviealbum m5 = movieList.get(position);
Intent i = new Intent(getApplicationContext(),album.
FullImageActivity.class);
i.putExtra("movieobject", m5);
startActivity(i);
}
});
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());
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
Moviealbum movie = new Moviealbum();
movie.setTitle(obj.getString("no"));
movie.setThumbnailUrl(obj.getString("alinks"));
// 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) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue...................................
AppController.getInstance().addToRequestQueue(movieReq);
}
@Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
适配器类:-
public class CustomListAdapter extends FancyCoverFlowAdapter {
private Activity activity;
private LayoutInflater inflater;
List<Moviealbum> movieItems;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();
public CustomListAdapter(Activity activity, List<Moviealbum> 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 getCoverFlowItem(int position, View reuseableView, ViewGroup viewGroup) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (reuseableView == null)
reuseableView = inflater.inflate(R.layout.gallary_list_row, null);
if (imageLoader == null)
imageLoader = AppController.getInstance().getImageLoader();
NetworkImageView thumbNail = (NetworkImageView) reuseableView
.findViewById(R.id.thumbnail);
// ...............................................
TextView title = (TextView) reuseableView.findViewById(R.id.title);
// getting movie data for the row
Moviealbum m = movieItems.get(position);
// thumbnail image
thumbNail.setImageUrl(m.getThumbnailUrl(), imageLoader);
// title
title.setText(m.getTitle());
return reuseableView;
}
应用程序运行正常，但加载后显示空白屏幕，没有图像。
日志:-
最佳答案
您的问题不在于 CoverFlow 代码，而在于您在哪里进行网络操作。在应用程序加载时，开始对 JSON 负载进行网络请求，显示一个微调器以显示应用程序正在加载，并在加载图像后填充适配器。我假设您已经为 GridView 实现提供了网络代码？如果我错过了什么，请告诉我。希望对您有所帮助!
编辑:
将图像添加到适配器后，确保调用 notifyDataSetChanged() 告诉适配器重新加载其 View 。
编辑 2:
看看这里的这一行:
this.fancyCoverFlow.setAdapter(new CustomListAdapter(this, movieList));
您正在传递一个新的 CustomListAdapter 而不是传递您的适配器变量。尝试修复它，如果它有效，请告诉我。
关于java - 如何从现有的 gridview 图像实现 coverflow 布局，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31341264/