我有一个自定义的 GridView 适配器，它将一个 AudioGridItem 对象作为其构造函数中的一个参数。所以基本上每个对象都有 2 个 ImageView 和 1 个 TextView。当我删除网格位置时，使用长按监听器，它应该删除文件(在 SD 卡上)，然后在上一张图像 (Uri) 的位置放置一个可绘制的占位符。它还应将 TextView 设置为空 String。但这不起作用。 ImageView 更新了，但文件的 TextView 标题仍然留在旧位置。这导致 ArrayList 中的所有内容都向上移动了一个位置，但文件的标题仍在旧位置。然而，奇怪的是，当我切换到我的照片选项卡，然后返回到我的音频选项卡时，TextView 会正确更新(但当我切换到视频或写入选项卡时它不会更新，奇怪。)
在重新加载所有内容(重新运行 AsyncTask)之前，我确实清除了适配器和 ArrayList。
我在这里看到了关于这个问题的其他帖子，但没有找到对我有用的东西。 This有人谈论使用正确的 TextView，但我只有一个，并且正在正确使用它。也就是说，涉及我的 TextView 的其他一些代码可能不正确？这是我唯一能想到的，因为我到处都使用 notifyDataSetChanged()，所以我知道我的适配器已更新(加上 ImageView 的更改，所以这是一个暗示)。我在长按监听器中使用的逻辑是:
删除SD卡上位置的文件
清除我的适配器和列表(然后调用
notifyDataSetChanged())再次调用
AsyncTask从 SD 卡重新加载
有什么想法吗？正如您在照片中看到的，突出显示的图标是那些有声音文件和附加到它们的 ImageView 的可绘制对象(可以正确播放)，但较暗的图标是占位符，以及我试图长按以删除的文件，它显示了占位符图标(它应该如此)，而且还在 TextView 中显示了那个挥之不去的标题。我该如何摆脱它？
AudioTab.java
package org.azurespot.cutecollection.audiotab;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.graphics.drawable.Drawable;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.GridView;
import org.azurespot.R;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
/**
* Created by mizu on 2/8/15.
*/
public class AudioTab extends Fragment {
private GridView gridView;
private GridViewAudioAdapter audioAdapter;
private ProgressDialog progressDialog;
private String[] numberSDCardFiles = null;
File[] files;
ArrayList<AudioGridItem> audioFiles = new ArrayList<>();
AudioGridItem audioGridItem;
AudioGridItem drawable;
AudioGridItem drawableSound;
MediaPlayer mp;
Uri drawableOff;
String audioTitle;
public AudioTab(){
super();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.audio_tab, container, false);
mp = new MediaPlayer();
// instantiate your progress dialog
progressDialog = new ProgressDialog(getActivity());
// with fragments, make sure you include the rootView when finding id
gridView = (GridView) v.findViewById(R.id.audio_grid);
// Create the Custom Adapter Object
audioAdapter = new GridViewAudioAdapter(getActivity(), audioFiles);
// Set the Adapter to GridView
gridView.setAdapter(audioAdapter);
if(audioAdapter.getCount() == 0) {
// load contents of SD card through AsyncTask
new AudioDownloaderTask().execute();
}
setupGridViewListener();
return v;
}
private class AudioDownloaderTask extends AsyncTask<Object, Void, AudioGridItem> {
@Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog.setMessage("Loading cute collection ...");
//set the progress bar to cancelable on back button
progressDialog.setCancelable(true);
progressDialog.show();
}
@Override
protected AudioGridItem doInBackground(Object... params) {
retrieveAudio();
return null;
}
@Override
protected void onPostExecute(AudioGridItem result) {
progressDialog.dismiss();
// add sound off drawable to replace song files when there are none
for (int i = 0; i < (15 - numberSDCardFiles.length); i++) {
audioAdapter.add(drawable);
}
audioAdapter.notifyDataSetChanged();
}
}
public void retrieveAudio() {
// creates a new AudioGridItem object with this drawable as the source
drawableSound = new AudioGridItem(null, getResources().getDrawable
(R.drawable.ic_sounds_placeholder_on), null);
try {
// gets directory Cute Videos from sd card
File cuteVideosDir = new File(Environment.getExternalStoragePublicDirectory
(Environment.DIRECTORY_PODCASTS), "Cute Sounds");
// puts list into files Array
files = cuteVideosDir.listFiles();
// get number of files in Cute Sounds directory
numberSDCardFiles = new String[files.length];
for (File singleFile : files) {
// get both audio file and audio title
Uri audioUri = Uri.fromFile(singleFile);
audioTitle = singleFile.getName();
// get sound on drawable from object
Drawable drawableOn = drawableSound.getDrawable();
// since in a loop, sound on drawable will be added same as files
audioGridItem = new AudioGridItem(audioUri, drawableOn, audioTitle);
// add Uri, drawable (sound on) and title to ArrayList
audioFiles.add(audioGridItem);
}
// put sound off drawable into an AudioGridItem object (as Uri, no Drawable or String)
drawableOff = Uri.parse("android.resource://org.azurespot/drawable/"
+ R.drawable.ic_sounds_placeholder);
drawable = new AudioGridItem(drawableOff, null, null);
} catch (Exception e) {
e.printStackTrace();
}
}
private void setupGridViewListener() {
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView,
View item, int pos, long id) {
AudioGridItem currentItem = audioAdapter.getItem(pos);
mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener(){
public void onCompletion(MediaPlayer mediaPlayer){
mediaPlayer.reset();
}
});
if(!(audioAdapter.getItem(pos).equals(drawable))) {
if(currentItem == audioAdapter.getItem(pos)) {
if (mp.isPlaying()) {
mp.reset();
}
else {
Uri soundFile = (audioAdapter.getItem(pos)).getAudio();
try {
mp.setDataSource(getActivity(), soundFile);
mp.prepare();
mp.start();
} catch (IOException e) {
e.printStackTrace();
}
}
}
else{
Uri soundFile = (audioAdapter.getItem(pos)).getAudio();
try {
mp.setDataSource(getActivity(), soundFile);
mp.prepare();
mp.start();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
});
// to delete a Uri item
gridView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> aView, View item,
final int pos, long id) {
mp.reset();
// insures the placeholder drawable is not clickable
if (!(audioAdapter.getItem(pos)).equals(drawable)) {
new AlertDialog.Builder(getActivity())
.setTitle("Delete")
.setMessage("Delete this cute sound?")
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// delete from ArrayList first
audioFiles.remove(pos);
// get file name then delete it from SD card
String name = files[pos].getName();
File file = new File(Environment.getExternalStoragePublicDirectory
(Environment.DIRECTORY_PODCASTS), "Cute Sounds" + "/" + name);
file.delete();
audioGridItem.setAudioTitle(" ");
// after each item delete, replace with default icon, and empty String
audioAdapter.add(new AudioGridItem(drawableOff, null, null));
// clear old list first
audioAdapter.clear();
audioFiles.clear();
audioAdapter.notifyDataSetChanged();
// reload all files, so positioning is right when open it
new AudioDownloaderTask().execute();
Log.d("TAG", "Reached after async runs again.");
}
})
.setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// do nothing
dialog.cancel();
}
})
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
}
return true;
}
});
}
}
GridViewAudioAdapter.java
package org.azurespot.cutecollection.audiotab;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.TextView;
import org.apache.commons.io.FilenameUtils;
import org.azurespot.R;
import java.util.ArrayList;
/**
* Created by mizu on 2/8/15.
*/
public class GridViewAudioAdapter extends ArrayAdapter<AudioGridItem> {
private TextView audioTitleView;
int position;
ViewHolder holder = null;
Context context;
String rootName;
public GridViewAudioAdapter(Context context, ArrayList<AudioGridItem> audio) {
super(context, 0, audio);
this.context = context;
}
@Override
public View getView(int position, View itemView, ViewGroup parent) {
this.position = position;
if (itemView == null) {
itemView = LayoutInflater.from(getContext())
.inflate(R.layout.audio_tab_item, parent, false);
holder = new ViewHolder();
holder.audioViewFile = (ImageView) itemView.findViewById(R.id.audio_file);
holder.audioViewIcon = (ImageView) itemView.findViewById(R.id.audio_icon);
audioTitleView = (TextView) itemView.findViewById(R.id.audio_title);
// stores holder with view
itemView.setTag(holder);
} else {
holder = (ViewHolder)itemView.getTag();
}
// get position of the item clicked in GridView
final AudioGridItem audioGridItem = getItem(position);
if (audioGridItem != null) {
// getting the Uri from here might give a file or the off drawable
Uri audioUri = audioGridItem.getAudio();
// this will only ever be the on drawable
Drawable drawableOn = audioGridItem.getDrawable();
// set text
String audioTitle = audioGridItem.getAudioTitle();
if (audioTitle != null) {
rootName = FilenameUtils.removeExtension(audioTitle);
audioTitleView.setText(rootName);
} else
audioTitleView.setText(" ");
// set the Uri or drawable into the ImageView slots
holder.audioViewFile.setImageURI(audioUri);
holder.audioViewIcon.setImageDrawable(drawableOn);
// positioning the file Uri in the GridView slot
holder.audioViewFile.setScaleType(ImageView.ScaleType.CENTER_CROP);
holder.audioViewFile.setLayoutParams(new FrameLayout.LayoutParams
(220, 220));
// positioning the drawable icon in the GridView slot
holder.audioViewIcon.setScaleType(ImageView.ScaleType.CENTER_CROP);
holder.audioViewIcon.setLayoutParams(new FrameLayout.LayoutParams
(220, 220));
}
return itemView;
}
public class ViewHolder{
ImageView audioViewFile;
ImageView audioViewIcon;
}
}
AudioGridItem.java
package org.azurespot.cutecollection.audiotab;
import android.graphics.drawable.Drawable;
import android.net.Uri;
/**
* Created by mizu on 4/26/15.
*/
public class AudioGridItem {
private Uri audio;
private String audioTitle;
Drawable drawableOn;
public AudioGridItem(Uri audio, Drawable drawable, String autoTitle) {
super();
this.audio = audio;
this.drawableOn = drawable;
this.audioTitle = autoTitle;
}
public Uri getAudio() {
return audio;
}
public void setAudio(Uri audio){
this.audio = audio;
}
public Drawable getDrawable(){
return drawableOn;
}
public void setDrawable(Drawable drawable){
this.drawableOn = drawable;
}
public String getAudioTitle(){
return audioTitle;
}
public void setAudioTitle(String audioTitle){
this.audioTitle = audioTitle;
}
}
最佳答案
嗯，看看这个
在你的GridViewAudioAdapter.java
public class GridViewAudioAdapter extends ArrayAdapter<AudioGridItem> {
private TextView audioTitleView; // look at this madam
int position;
在您的getView 方法中
holder = new ViewHolder();
holder.audioViewFile = (ImageView)itemView.findViewById(R.id.audio_file);
holder.audioViewIcon = (ImageView)itemView.findViewById(R.id.audio_icon);
audioTitleView = (TextView)itemView.findViewById(R.id.audio_title);
我没有很好的解释，因为现在我正在整理我的想法，但不同之处在于，您的 ImageView 是 Ok 而不是您的 TextView 所以看看你的 getView 我会把 TextView 声明放在 ViewHolder 所以你的 getView 看起来像这个
holder = new ViewHolder();
holder.audioViewFile = (ImageView)itemView.findViewById(R.id.audio_file);
holder.audioViewIcon = (ImageView)itemView.findViewById(R.id.audio_icon);
holder.audioTitleView=(TextView)itemView.findViewById(R.id.audio_title);
试试看看有没有帮助
关于android - 自定义 GridView 适配器中的 TextView 不会更新，但 ImageView 会更新，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29932215/