我有一份音乐列表，所以我希望用户在特定时间设置播放音乐的时间。 这里我有一个列表视图，它有一个文本视图（最初是不可见的）和一个按钮。 当我点击按钮时，会打开一个警告对话框，显示设备时间和时间选择器。 我减去这些时间并将结果发送到Count Down Timer，In on Tick 我将文本视图设置为可见，以便向用户显示时间，直到完成时间。 一切都是正确的 用户可以在设定的时间后播放音乐。 但是当我滚动列表视图时，我的文本视图（显示计时器）消失了。 这是我的代码：
public class Main扩展Activity {
public static int hour_device, minute_device;
public static int hour_user, minute_user;
Splash splash;
ListView listView;
Adaptor adaptor;
private MediaPlayer mediaPlayer;
static View lastview = null;
static MyIndexStore indexStore;
List<String> lines1 = new ArrayList<String>();
List<String> lines2 = new ArrayList<String>();
static List<String> array_audio = new ArrayList<String>();
InputStream in;
BufferedReader reader;
String line = "1";
String[] tracks;
String[] names;
String[] infos;
HashMap<Integer,String> textMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
indexStore = new MyIndexStore(getApplicationContext());
setContentView(R.layout.main_activity);
splash = new Splash(this);
splash.set_identity("1");
initiate();
mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.a1);
//lastview = null;
listView = (ListView) findViewById(R.id.list);
ReadText1();
names = lines1.toArray(new String[0]);// = {"track one","the seconnd track","a nice track","name name name","the seconnd track","a nice track","name name name"};
ReadText2();
infos = lines2.toArray(new String[0]);
tracks = array_audio.toArray(new String[0]);
adaptor = new Adaptor(getApplicationContext(), tracks, names, infos,textMap);
listView.setAdapter(adaptor);
mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer arg0) {
if (lastview != null) {
ImageView play = (ImageView) lastview.findViewById(R.id.play_stop);
play.setImageResource(R.drawable.n_btn_play_unselected);
}
}
});
}
private static void initiate() {
Field[] fields = R.raw.class.getFields();
array_audio.clear();
for (int count = 0; count < fields.length; count++) {
array_audio.add("a" + (count + 1));
}
}
private void play(int index) {
mediaPlayer.release();
index++;
String s = "a" + index;
Resources resources = getResources();
final int resourceId = resources.getIdentifier(s, "raw", getPackageName());
try {
mediaPlayer = MediaPlayer.create(this, resourceId);
mediaPlayer.start();
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
protected void onPause() {
mediaPlayer.release();
listView.invalidateViews();
super.onPause();
}
private void ReadText1() {
lines1.clear();
line = "1";
try {
in = this.getAssets().open("names.txt");
reader = new BufferedReader(new InputStreamReader(in));
while (line != null) {
line = reader.readLine();
if (line != null)
lines1.add(line);
else
break;
}
} catch (IOException e) {
e.printStackTrace();
}
}
private void ReadText2() {
lines2.clear();
line = "1";
try {
in = this.getAssets().open("infos.txt");
reader = new BufferedReader(new InputStreamReader(in));
while (line != null) {
line = reader.readLine();
if (line != null)
lines2.add(line);
else
break;
}
} catch (IOException e) {
e.printStackTrace();
}
}
public class Adaptor extends ArrayAdapter<String> {
private final Context context;
private final String[] tracks;
private final String[] names;
private final String[] infos;
private final HashMap<Integer,String> textMap;
Typeface type_face;
public Adaptor(Context context, String[] tracks, String[] names, String[] infos,HashMap<Integer,String> textMap) {
super(context, R.layout.track, tracks);
this.context = context;
this.tracks = tracks;
this.names = names;
this.infos = infos;
type_face = Typeface.createFromAsset(context.getAssets(), "BTitrBd.ttf");
this.textMap = textMap;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View rowView = inflater.inflate(R.layout.track, parent, false);
TextView name = (TextView) rowView.findViewById(R.id.track_name);
final TextView time = (TextView) rowView.findViewById(R.id.time);
//populate the textview from map
if(textMap!=null && textMap.get(new Integer(position))!=null){
time.setText(textMap.get(new Integer(position)));
}
name.setText(names[position]);
name.setTypeface(type_face);
name.setTypeface(type_face);
final ImageView ringtone = (ImageView) rowView.findViewById(R.id.ringtone);
if (position == indexStore.getindex())
ringtone.setImageResource(R.drawable.n_btn_ringtone_seted);
final ImageView play = (ImageView) rowView.findViewById(R.id.play_stop);
ringtone.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
LayoutInflater factory = LayoutInflater.from(Main.this);
final View deleteDialogView = factory.inflate(
R.layout.mylayout, null);
final AlertDialog deleteDialog = new AlertDialog.Builder(Main.this).create();
deleteDialog.setView(deleteDialogView);
TextView device_time = (TextView) deleteDialogView.findViewById(R.id.current_time);
Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
hour_device = hour;
minute_device = minute;
device_time.setText(hour_device + ":" + minute_device);
deleteDialogView.findViewById(R.id.set).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
TimePicker timePicker = (TimePicker) deleteDialogView.findViewById(R.id.timepicker);
timePicker.setIs24HourView(true);
hour_user = timePicker.getCurrentHour();
minute_user = timePicker.getCurrentMinute();
String time1 = hour_device + ":" + minute_device;
String time2 = hour_user + ":" + minute_user;
SimpleDateFormat format = new SimpleDateFormat("HH:mm");
Date date1 = null;
try {
date1 = format.parse(time1);
} catch (ParseException e) {
e.printStackTrace();
}
Date date2 = null;
try {
date2 = format.parse(time2);
} catch (ParseException e) {
e.printStackTrace();
}
long result = date2.getTime() - date1.getTime();
new CountDownTimer(result, 1000) {
public void onTick(long millisUntilFinished) {
time.setText(("seconds remaining: " + millisUntilFinished / 1000));
//create HashMap<Integer,String> textMap at the constructer of the adapter
//now fill this info into it
textMap.put(new Integer(position),"seconds remaining: " + millisUntilFinished / 1000);
//notify about the data change
notifyDataSetChanged();
}
public void onFinish() {
time.setVisibility(View.INVISIBLE);
Toast.makeText(getApplicationContext(), "finish", Toast.LENGTH_LONG).show();
if (rowView != lastview || mediaPlayer == null) {
play(position);
if (lastview != null)
lastview = rowView;
} else {
play.setImageResource(R.drawable.n_btn_play_unselected);
mediaPlayer.release();
lastview = null;
}
}
}.start();
deleteDialog.dismiss();
}
});
deleteDialog.show();
}
});
play.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
if (rowView != lastview || mediaPlayer == null) {
play(position);
if (lastview != null)
lastview = rowView;
} else {
play.setImageResource(R.drawable.n_btn_play_unselected);
mediaPlayer.release();
lastview = null;
}
}
});
return rowView;
}
}
}
我需要帮助，有什么建议吗？ 我是android的新手： - ）
答案 0 :(得分：0)
您必须使用Reclyclerview，textview对您的要求是原始的。 https://developer.android.com/training/material/lists-cards.html
答案 1 :(得分：0)
像这样更新您的倒数计时器
new CountDownTimer(result, 1000) {
public void onTick(long millisUntilFinished) {
time.setText(("seconds remaining: " + millisUntilFinished / 1000));
//create HashMap<Integer,String> textMap at the constructer of the adapter
//whenever you want to clear a record clear the hash map
//now fill this info into it
textMap.put(new Integer(position),"seconds remaining: " + millisUntilFinished / 1000);
//notify about the data change
notifyDataSetChanged();
}
public void onFinish() {
time.setVisibility(View.INVISIBLE);
Toast.makeText(getApplicationContext(), "finish", Toast.LENGTH_LONG).show();
if (rowView != lastview || mediaPlayer == null) {
play(position);
if (lastview != null)
lastview = rowView;
} else {
play.setImageResource(R.drawable.n_btn_play_unselected);
mediaPlayer.release();
lastview = null;
}
}
}.start();
在您发起textView text;
final TextView time = (TextView) rowView.findViewById(R.id.time);
//populate the textview from map
if(textMap!=null && textMap.get(new Integer(position))!=null){
time.setText(textMap.get(new Integer(position)));
}
此持续更新可能会导致滞后问题。