所以我的应用程序占用80MB或RAM，偶尔在活动之间切换时，屏幕变黑，显示正确的内容需要一分钟。它所做的就是在每个活动中加载列表视图。我确保在首次启动活动时在加载屏幕中执行所有AsyncTasks，然后我使用共享首选项来存储数据并在所有活动中使用它，这样我就不必每次都执行新的Asynctask活动开始了。这就是为什么我很困惑为什么会发生这种情况。我唯一能想到的是，当我调用finish()时，活动不会被杀死，因为当我多次在活动之间切换时通常会发生这种情况。
示例活动：
public class AllGameslistActivity extends Activity {
private Bet newBet = new Bet();
private double stake = 0.00;
private String name = "";
private double newwinnings;
private ArrayList<TipDisplayer> alltips = new ArrayList<>();
private String newwinningstoString;
private RecyclerView recyclerview;
private String selection;
private ArrayList<Integer> ids = new ArrayList<>();
private ArrayList<BetParameters> listwriter = new ArrayList<>();
// Progress Dialog
private static String url_all_games = "****";
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> gamesList;
// url to get all products list
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_GAMELIST = "gamelist";
private static final String TAG_ID = "ID";
private static final String TAG_LEAGUE = "League";
private static final String TAG_TEAMS = "Teams";
private static final String TAG_BET = "Bet";
private static final String TAG_ODDS = "Odds";
private static final String TAG_DATETIMER = "DateTimer";
private static final String TAG_COMMENTS = "Comments";
private static final String TAG_TYPE = "Type";
// products JSONArray
JSONArray allgames = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.all_bets);
overridePendingTransition(R.anim.push_up_out, R.anim.push_up_in);
this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
menu menu = (menu) getFragmentManager().findFragmentById(R.id.fragment);
menu.betnowclick();
SessionManager session;
session = new SessionManager(getApplicationContext());
HashMap<String, String> user = session.getUserDetails();
name = user.get(SessionManager.USERNAME);
menu.updateinfo(getName());
alltips = session.getalltips();
PopulateList();
// Hashmap for ListView
gamesList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
//new LoadAllGames().execute();
// Get listview
}
private void PopulateList() {
ArrayAdapter<TipDisplayer> adapter = new MyListAdapter(alltips);
final ListView list = (ListView) findViewById(R.id.mylist);
list.setAdapter(adapter);
}
/**
* Background Async Task to Load all product by making HTTP Request
*/
class LoadAllGames extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
*/
@Override
protected void onPreExecute() {
super.onPreExecute();
}
/**
* getting All products from url
*/
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("User-Agent","Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.81 Safari/537.36"));
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_games, "GET", params);
// Check your log cat for JSON reponse
Log.d("All Games: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Games
allgames = json.getJSONArray(TAG_GAMELIST);
// looping through All Products
for (int i = 0; i < allgames.length(); i++) {
JSONObject c = allgames.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_ID);
String league = c.getString(TAG_LEAGUE);
String odds = c.getString(TAG_ODDS);
String comments = c.getString(TAG_COMMENTS);
String type = c.getString(TAG_TYPE);
String bet = c.getString(TAG_BET);
String datetimer = c.getString(TAG_DATETIMER);
String Teams = c.getString(TAG_TEAMS);
Double Odds = Double.parseDouble(odds);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_ID, id);
map.put(TAG_LEAGUE,league);
map.put(TAG_ODDS,odds);
map.put(TAG_COMMENTS,comments);
map.put(TAG_TYPE,type);
map.put(TAG_BET,bet);
map.put(TAG_DATETIMER,datetimer);
map.put(TAG_TEAMS, Teams);
Log.d("id", id);
Log.d("league", league);
Log.d("odds", odds);
Log.d("comments", comments);
Log.d("Type", type);
Log.d("bet", bet);
Log.d("datetimer", datetimer);
Log.d("teams",Teams);
alltips.add(i, new TipDisplayer(id, league, Teams, bet, odds, datetimer, comments, type));
// adding HashList to ArrayList
gamesList.add(map);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return "";
}
/**
* After completing background task Dismiss the progress dialog
* *
*/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
// updating UI from Background Thread
PopulateList();
}
}
class ViewHolder {
TextView leaguetxt;
TextView datetxt;
TextView teamstxt;
TextView bettxt;
TextView betid;
TextView typetxt;
TextView commentstxt;
Button oddsbtn;
LinearLayout item;
ViewHolder(View v) {
leaguetxt = (TextView) v.findViewById(R.id.leaguetxt);
datetxt = (TextView) v.findViewById(R.id.datetxt);
teamstxt = (TextView) v.findViewById(R.id.teamstxt);
bettxt = (TextView) v.findViewById(R.id.bettxt);
betid = (TextView) v.findViewById(R.id.gid);
typetxt = (TextView) v.findViewById(R.id.difficultytxt);
commentstxt = (TextView) v.findViewById(R.id.commenttxt);
oddsbtn = (Button) v.findViewById(R.id.oddsbutton);
item = (LinearLayout) v.findViewById(R.id.item);
}
}
private class MyListAdapter extends ArrayAdapter<TipDisplayer> {
public MyListAdapter() {
super(AllGameslistActivity.this, R.layout.list_item, alltips);
}
public MyListAdapter(ArrayList<TipDisplayer> alltips) {
super(AllGameslistActivity.this, R.layout.list_item, alltips);
alltips = alltips; // declare tomee in the Adapter, don't use static
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View itemView = convertView;
TipDisplayer currentwriter = alltips.get(position);
ViewHolder holder = null;
if (itemView == null) {
itemView = getLayoutInflater().inflate(R.layout.list_item, parent, false);
holder = new ViewHolder(itemView);
itemView.setTag(holder);
Log.d("SETTING","new holder");
}
else {
holder = (ViewHolder) itemView.getTag();
Log.d("plzwork",ids.toString());
if (!ids.contains(Integer.parseInt(holder.betid.getText().toString()))) {
Log.d("doesn't contain", "doesn't contain");
Log.d("betid",holder.betid.getText().toString());
Log.d("bettxt", holder.bettxt.getText().toString());
}
else {
Log.d("recycling contains", "contains");
Log.d("betid", holder.betid.getText().toString());
Log.d("bettxt", holder.bettxt.getText().toString());
}
Log.d("Recycling","recycling");
}
holder.item.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
LinearLayout layout = (LinearLayout) v;
Button b = (Button) layout.findViewById(R.id.oddsbutton);
ListView listView = (ListView) layout.getParent();
final int position = listView.getPositionForView(listView);
String buttontext = b.getText().toString();
Button lastchance = (Button) layout.findViewById(R.id.oddsbutton);
TextView betidtextbox = (TextView) layout.findViewById(R.id.gid);
String betid = betidtextbox.getText().toString();
TipDisplayer currentwriter = alltips.get(position + 1);
Log.d("plzworkkkk", newBet.toString());
if (ids.contains(Integer.parseInt(betid))) {
b.setTextColor(Color.parseColor("#000000"));
b.setTextSize(18);
ids.remove(new Integer(Integer.parseInt(betid)));
Log.d("plzworkkkkkkk", newBet.toString());
currentwriter.toggleHighlighted();
//checkhighlight(layout);
Log.d("getodds", buttontext);
selection = "home";
TextView teamss = (TextView) layout.findViewById(R.id.teamstxt);
String teams = teamss.getText().toString();
Log.d("teams", teams);
TextView bet = (TextView) layout.findViewById(R.id.bettxt);
String bettxt = bet.getText().toString();
Log.d("btxttext", bettxt);
newBet.generateoddstesting(betid, buttontext, false, teams, selection, bettxt);
double newodds = newBet.calculateodds();
TextView myBetOdds = (TextView) findViewById(R.id.bettingodds);
TextView potentialWinnings = (TextView) findViewById(R.id.potentialwinnings);
myBetOdds.setText("@" + String.format("%.2f", newodds) + "/1");
EditText mEdit = (EditText) findViewById(R.id.editText2);
if (mEdit.getText().toString().length() == 0) {
stake = 0.00;
newwinnings = 0.00;
potentialWinnings.setText("0.00");
} else {
mEdit.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start,
int count, int after) {
}
public void onTextChanged(CharSequence s, int start,
int before, int count) {
if (s.length() != 0) {
stake = Double.parseDouble(s.toString());
double newodds = newBet.calculateodds();
newwinnings = stake * newodds;
TextView myBetOdds = (TextView) findViewById(R.id.bettingodds);
TextView potentialWinnings = (TextView) findViewById(R.id.potentialwinnings);
myBetOdds.setText("@" + String.format("%.2f", newodds) + "/1");
potentialWinnings.setText(String.format("%.2f", (newwinnings)));
newwinningstoString = potentialWinnings.getText().toString();
} else {
stake = 0.00;
newwinnings = 0.00;
double newodds = newBet.calculateodds();
TextView myBetOdds = (TextView) findViewById(R.id.bettingodds);
TextView potentialWinnings = (TextView) findViewById(R.id.potentialwinnings);
myBetOdds.setText("@" + String.format("%.2f", newodds) + "/1");
potentialWinnings.setText(String.format("%.2f", (newwinnings)));
newwinningstoString = potentialWinnings.getText().toString();
}
}
public void afterTextChanged(Editable s) {
}
});
//stake = Double.parseDouble(mEdit.getText().toString());
newwinnings = stake * newodds;
potentialWinnings.setText(String.format("%.2f", (newwinnings)));
newwinningstoString = potentialWinnings.getText().toString();
}
} else {
ids.add(Integer.parseInt(betid));
//checkhighlight(layout);
b.setTextColor(Color.parseColor("#EB102E"));
b.setTextSize(20);
currentwriter.toggleHighlighted();
selection = "home";
String getodds = lastchance.getText().toString();
Log.d("getoddsss", getodds);
EditText mEdit = (EditText) findViewById(R.id.editText2);
if (mEdit.getText().toString().length() == 0) {
stake = 0.00;
newwinnings = 0.00;
TextView potentialWinnings = (TextView) findViewById(R.id.potentialwinnings);
potentialWinnings.setText("0.00");
} else {
mEdit.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start,
int count, int after) {
}
public void onTextChanged(CharSequence s, int start,
int before, int count) {
if (s.length() != 0) {
stake = Double.parseDouble(s.toString());
double newodds = newBet.calculateodds();
newwinnings = stake * newodds;
TextView myBetOdds = (TextView) findViewById(R.id.bettingodds);
TextView potentialWinnings = (TextView) findViewById(R.id.potentialwinnings);
myBetOdds.setText("@" + String.format("%.2f", newodds) + "/1");
potentialWinnings.setText(String.format("%.2f", (newwinnings)));
newwinningstoString = potentialWinnings.getText().toString();
} else {
stake = 0.00;
double newodds = newBet.calculateodds();
newwinnings = stake * newodds;
TextView myBetOdds = (TextView) findViewById(R.id.bettingodds);
TextView potentialWinnings = (TextView) findViewById(R.id.potentialwinnings);
myBetOdds.setText("@" + String.format("%.2f", newodds) + "/1");
potentialWinnings.setText(String.format("%.2f", (newwinnings)));
newwinningstoString = potentialWinnings.getText().toString();
}
}
public void afterTextChanged(Editable s) {
}
});
stake = Double.parseDouble(mEdit.getText().toString());
TextView teamms = (TextView) layout.findViewById(R.id.teamstxt);
String teams = teamms.getText().toString();
Log.d("teams", teams);
TextView bet = (TextView) layout.findViewById(R.id.bettxt);
String bettxt = (String) bet.getText().toString();
Log.d("bettxt", bettxt);
newBet.generateoddstesting(betid, buttontext, true, teams, selection, bettxt);
double newodds = newBet.calculateodds();
newwinnings = stake * newodds;
TextView myBetOdds = (TextView) findViewById(R.id.bettingodds);
TextView potentialWinnings = (TextView) findViewById(R.id.potentialwinnings);
myBetOdds.setText("@" + String.format("%.2f", newodds) + "/1");
potentialWinnings.setText(String.format("%.2f", (newwinnings)));
newwinningstoString = potentialWinnings.getText().toString();
}
}
}
});
String leaguetext = currentwriter.getLeague();
String datetext = currentwriter.getDatetimer();
String teamstext = currentwriter.getTeams();
String bettext = currentwriter.getBet();
String typetext = currentwriter.getType();
String idtext = currentwriter.getId();
String commentsText = currentwriter.getComments();
String oddstext = currentwriter.getOdds();
holder.leaguetxt.setText(leaguetext);
holder.datetxt.setText(datetext.substring(0,datetext.lastIndexOf(":")) + " GMT");
holder.teamstxt.setText(teamstext);
holder.bettxt.setText(bettext);
holder.betid.setText(idtext);
holder.commentstxt.setText(commentsText);
holder.oddsbtn.setText(oddstext);
holder.typetxt.setText(typetext);
if (typetext.equals("Low Risk")) {
holder.typetxt.setTextColor(Color.parseColor("#067103"));
}
else if (typetext.equals("Medium Risk")) {
holder.typetxt.setTextColor(Color.parseColor("#D9D216"));
}
else if (typetext.equals("Longshot")) {
holder.typetxt.setTextColor(Color.parseColor("#F75528"));
}
return itemView;
}
@Override
public int getViewTypeCount() {
return getCount();
}
@Override
public int getItemViewType(int position) {
return position;
}
}
public void clicking(View v) {
}
public void NewBetMaker(View v) {
menu menu = (menu) getFragmentManager().findFragmentById(R.id.fragment);
int value = (int) stake;
if (value == 0) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Enter Stake");
builder.setMessage("You did not enter any stake for your bet.");
builder.setNeutralButton("Ok.", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// Do nothing
dialog.dismiss();
}
});
builder.show();
}
else {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Confirm Bet Placement");
builder.setMessage("Are you sure you would like to place this bet?");
builder.setNegativeButton("Nope.", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// Do nothing
dialog.dismiss();
}
});
builder.setPositiveButton("YES, BET NOW!", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Do nothing but close the dialog
menu menu = (menu) getFragmentManager().findFragmentById(R.id.fragment);
int pass = (int) stake;
Intent i = new Intent(AllGameslistActivity.this, MyBets.class);
HashMap<Integer, Game> listofgames = new HashMap<Integer, Game>();
HashMap<Integer,String> betdatabasesetter = new HashMap<Integer, String>();
listofgames = newBet.getlistofgames();
for (Integer x : listofgames.keySet()) {
TextView teams = (TextView) findViewById(R.id.textView2);
String getTeams = listofgames.get(x).getTeams();
teams.setText(getTeams);
TextView selectionodds = (TextView) findViewById(R.id.textView3);
String selectedoutcome = listofgames.get(x).getSelection();
Double selectedoutcomeodds = listofgames.get(x).getSelectedOdds();
String selectedteam = "";
if (selectedoutcome.equals("home")) {
selectedteam = listofgames.get(x).getBet();
betdatabasesetter.put(x,"1");
}
String selection = (selectedteam + " @" + selectedoutcomeodds);
BetParameters y = new BetParameters(getTeams, selection);
listwriter.add(y);
Log.d("teams", getTeams);
Log.d("selected odds", Double.toString(selectedoutcomeodds));
Log.d("selected team", selectedteam);
Log.d("selected outcome", selectedoutcome);
Log.d("selection", selection);
}
i.putExtra("hash",new DataWrapper(betdatabasesetter));
i.putExtra("data", new DataWrapper(listwriter));
i.putExtra("stake", stake);
i.putExtra("winnings",newwinningstoString);
((AppController) getApplicationContext()).setGamesList(gamesList);
startActivity(i);
finish();
}
});
AlertDialog alert = builder.create();
alert.show();
}
}
public String getName() {
SessionManager session;
session = new SessionManager(getApplicationContext());
HashMap<String, String> user = session.getUserDetails();
name = user.get(SessionManager.USERNAME);
return name;
}
public void checkhighlight(View v) {
TextView betid = (TextView) v.findViewById(R.id.gid);
String id = betid.getText().toString();
Button button = (Button) v.findViewById(R.id.oddsbutton);
if (ids.contains(Integer.parseInt(id))) {
button.setTextColor(Color.parseColor("#EB102E"));
button.setTextSize(20);
}
else {
button.setTextColor(Color.parseColor("#000000"));
button.setTextSize(18);
}
}
}