我不太清楚这里发生了什么，但每次我的片段加载到ViewPager中时，我都会在日志中注意到一些奇怪的活动。
在片段的onResume中我有以下内容：
Log.d("onResume", tabName);
首次加载时，它会记录一个条目
D/onResume﹕ [Food]
如果我旋转我的屏幕，或者启动/停止另一个导致ViewPager /片段再次加载的活动，我会在我的logcat中得到它
D/onResume﹕ [Food]
D/onResume﹕ [Food]
如果我第三次这样做了
D/onResume﹕ [Food]
D/onResume﹕ [Food]
D/onResume﹕ [Food]
等
任何人都知道可能导致这种情况的原因吗？
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.PagerAdapter;
public class MyFragmentPagerAdapter extends FragmentStatePagerAdapter {
int listSize;
String[] tabNames;
String tabName;
protected Context mContext;
/** Constructor of the class */
public MyFragmentPagerAdapter(FragmentManager fm, Context c) {
super(fm);
mContext = c;
}
/** This method will be invoked when a page is requested to create */
@Override
public Fragment getItem(int position) {
MainFragment mainFragment = new MainFragment();
final DatabaseHelper db = new DatabaseHelper(mContext);
tabName = "[" + getPageTitle(position) + "]";
Double balance = db.getSum(tabName);
Bundle data = new Bundle();
data.putInt("current_page", position + 1);
data.putString("tabName", tabName);
data.putDouble("balance", balance);
data.putInt("tabCount", getCount());
mainFragment.setArguments(data);
return mainFragment;
}
/** Returns the number of pages */
@Override
public int getCount() {
return listSize;
}
@Override
public CharSequence getPageTitle(int position) {
return tabNames[position];
}
public void setCount(int count){
listSize = count;
}
public void setNames(String[] names) {
tabNames = names;
}
@Override
public int getItemPosition(Object object) {
return PagerAdapter.POSITION_NONE;
}
}
这里是每个片段
import android.content.Context;
import android.graphics.Typeface;
import android.os.Bundle;
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.TextView;
import java.text.DecimalFormat;
import java.util.ArrayList;
public class MainFragment extends Fragment {
int mCurrentPage;
int tabCount;
int tableCount;
TextView tvBalanceDollar;
TextView tvBalanceCent;
String cents;
Context mContext;
String tabName;
Double balance;
DatabaseHelper db;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/** Getting the arguments to the Bundle object */
Bundle data = getArguments();
/** Getting integer data of the key current_page from the bundle */
mCurrentPage = data.getInt("current_page", 0);
tabName = data.getString("tabName");
balance = data.getDouble("balance", 0.0);
tabCount = data.getInt("tabCount", 0);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
mContext = container.getContext();
View v = inflater.inflate(R.layout.fragment_account, container, false);
tvBalanceDollar = (TextView) v.findViewById(R.id.tvBalanceDollar);
tvBalanceCent = (TextView) v.findViewById(R.id.tvBalanceCent);
Typeface tf = Typeface.createFromAsset(getActivity().getAssets(), "Roboto-Thin.ttf");
tvBalanceDollar.setTypeface(tf);
tvBalanceCent.setTypeface(tf);
return v;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
public void onResume() {
super.onResume();
if (setTabCount() > 0) {
updateFrag();
Log.d("onResume", tabName);
}
}
public void updateFrag() {
db = new DatabaseHelper(getActivity().getApplicationContext());
Log.d("TabName", tabName);
balance = db.getSum(tabName);
if (balance > 9999.99) {
tvBalanceDollar.setTextSize(75);
tvBalanceCent.setTextSize(37);
} else {
tvBalanceDollar.setTextSize(100);
tvBalanceCent.setTextSize(50);
}
if (balance > 0) {
tvBalanceDollar.setText("$" + new DecimalFormat("##.").format(Math.floor(balance)));
} else if (balance < 0 && balance > -1) {
tvBalanceDollar.setText("$-0.");
} else {
tvBalanceDollar.setText("$" + new DecimalFormat("##.").format(Math.ceil(balance)));
}
if ((balance - balance.intValue()) <= .1 && (balance - balance.intValue()) > 0) {
cents = new DecimalFormat(".00").format(balance - balance.intValue()).substring(1);
} else if ((balance - balance.intValue()) < 0) {
cents = new DecimalFormat(".00").format(balance - balance.intValue()).substring(2);
} else {
cents = new DecimalFormat(".00").format(balance - balance.intValue()).substring(1);
}
tvBalanceCent.setText(cents);
}
public int setTabCount() {
db = new DatabaseHelper(getActivity().getApplicationContext());
ArrayList<String> a = db.listTables();
tableCount = a.size();
return tableCount;
}
}
这是MainActivity
public class MainActivity extends FragmentActivity {
DatabaseHelper db = new DatabaseHelper(this);
MyFragmentPagerAdapter pagerAdapter;
int tableCount;
int RESET_TABS = 1;
ViewPager pager;
PagerTabStrip pagerTabStrip;
String tabName;
String transType;
public static String PACKAGE_NAME;
public static int PACKAGE_VERSION;
TextView tvWithdraw;
TextView tvDeposit;
MenuItem addAccount;
MenuItem deleteAccount;
MenuItem viewTransactions;
MenuItem editAccount;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setView();
PackageInfo pinfo = null;
try {
pinfo = getPackageManager().getPackageInfo(getPackageName(), 0);
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
PACKAGE_VERSION = pinfo.versionCode;
PACKAGE_NAME = pinfo.versionName;
Typeface tfAlexBrush = Typeface.createFromAsset(getAssets(), "AlexBrush-Regular.ttf");
int actionBarTitle = Resources.getSystem().getIdentifier("action_bar_title", "id", "android");
TextView actionBarTitleView = (TextView) getWindow().findViewById(actionBarTitle);
if(actionBarTitleView != null){
actionBarTitleView.setTypeface(tfAlexBrush);
}
}
public void onResume() {
super.onResume();
setView();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
}
if (resultCode == RESULT_CANCELED) {
}
if (resultCode == RESET_TABS) {
setTabs();
setView();
}
}
public int setTabCount() {
ArrayList<String> a = db.listTables();
tableCount = a.size();
return tableCount;
}
public String[] setTabNames() {
ArrayList<String> a = db.listTables();
String[] mStringArray = new String[a.size()];
mStringArray = a.toArray(mStringArray);
return mStringArray;
}
public void setTabs(){
pager = (ViewPager) findViewById(R.id.pager);
FragmentManager fm = getSupportFragmentManager();
pagerAdapter = new MyFragmentPagerAdapter(fm, getApplicationContext());
pagerAdapter.setCount(setTabCount());
pagerAdapter.setNames(setTabNames());
pager.setAdapter(pagerAdapter);
}
public void deleteAccount() {
final String niceTabName = pagerAdapter.getPageTitle(pager.getCurrentItem()).toString();
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
// set title
alertDialogBuilder.setTitle("Delete Account");
// set dialog message
alertDialogBuilder
.setMessage("Are you sure you wish to delete the account: " + niceTabName + "?" +
"\n\nWARNING: You will lose all data for this account!")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
db.deleteTable(niceTabName);
db.close();
Toast.makeText(getApplicationContext(), "Account " + niceTabName + " has been deleted.",
Toast.LENGTH_LONG).show();
setTabs();
setView();
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// if this button is clicked, just close
// the dialog box and do nothing
dialog.cancel();
}
});
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
}
public void setView() {
if (setTabCount() == 0) {
getFragmentManager().beginTransaction()
.add(R.id.mainFrameLayout, new PlaceholderFragment())
.commit();
} else {
setContentView(R.layout.activity_main);
Typeface tfThin = Typeface.createFromAsset(getAssets(), "Roboto-Thin.ttf");
Typeface tfLight = Typeface.createFromAsset(getAssets(), "Roboto-Thin.ttf");
tvWithdraw = (TextView) findViewById(R.id.tvWithdraw);
tvDeposit = (TextView) findViewById(R.id.tvDeposit);
pagerTabStrip = (PagerTabStrip) findViewById(R.id.pager_tab_strip);
tvWithdraw.setTypeface(tfLight);
tvDeposit.setTypeface(tfLight);
for (int i = 0; i < pagerTabStrip.getChildCount(); ++i) {
View nextChild = pagerTabStrip.getChildAt(i);
if (nextChild instanceof TextView) {
TextView textViewToConvert = (TextView) nextChild;
textViewToConvert.setTypeface(tfLight);
}
}
setTabs();
tvWithdraw.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tabName = "[" + pagerAdapter.getPageTitle(pager.getCurrentItem()).toString() + "]";
transType = "debit";
Intent i = new Intent(v.getContext(), AmountDialogActivity.class);
i.putExtra("type", "debit");
i.putExtra("table", tabName);
startActivityForResult(i, RESULT_OK);
}
});
tvDeposit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tabName = "[" + pagerAdapter.getPageTitle(pager.getCurrentItem()).toString() + "]";
transType = "credit";
Intent i = new Intent(v.getContext(), AmountDialogActivity.class);
i.putExtra("type", "credit");
i.putExtra("table", tabName);
startActivityForResult(i, RESULT_OK);
}
});
}
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
Typeface tfLight = Typeface.createFromAsset(getActivity().getAssets(), "Roboto-Light.ttf");
Typeface tfThin = Typeface.createFromAsset(getActivity().getAssets(), "Roboto-Thin.ttf");
Typeface tfAlexBrush = Typeface.createFromAsset(getActivity().getAssets(), "AlexBrush-Regular.ttf");
TextView tvSimpleRegister = (TextView) rootView.findViewById(R.id.tvSimpleRegister);
TextView tvCreateAccount = (TextView) rootView.findViewById(R.id.tvCreateAccount);
TextView tvCurrentVersion = (TextView) rootView.findViewById(R.id.tvCurrentVersion);
tvCurrentVersion.setText("Current Version: " + PACKAGE_NAME);
tvSimpleRegister.setTypeface(tfAlexBrush);
tvCreateAccount.setTypeface(tfLight);
tvCurrentVersion.setTypeface(tfThin);
return rootView;
}
}
}
答案 0 :(得分：0)
我在setView
中添加了多个setContentView(R.layout.activity_main);
为我删除这个已解决的多个问题...哇！