我整夜都在寻找解决方案......但我似乎找不到适合我代码的方案：S。我的片段在旋转时会被破坏，我知道我必须将它保存在一个捆绑或其他东西中，但是我太过诺，无法让它工作。 请帮忙，这是我的代码：
package com.remcoborst.mymovielibrary;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.ActionBar;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.FragmentTransaction;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.ListView;
import android.widget.TextView;
public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
// #5781a9
SectionsPagerAdapter mSectionsPagerAdapter;
private static Context context;
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MainActivity.context = getApplicationContext();
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
// Set up the action bar.
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
// When swiping between different sections, select the corresponding
// tab. We can also use ActionBar.Tab#select() to do this if we have
// a reference to the Tab.
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
// For each of the sections in the app, add a tab to the action bar.
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
actionBar.addTab(
actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(i)).setTabListener(this)
);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void onTabSelected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
// When the given tab is selected, switch to the corresponding page in
// the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
@Override
public void onTabReselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a DummySectionFragment (defined as a static inner class
// below) with the page number as its lone argument.
if(position == 0){
// My Movies class
Fragment fragment = new MyMovies();
return fragment;
}else{
// Add Movies
Fragment fragment = new AddMovies();
return fragment;
}
}
@Override
public int getCount() {
// Show 3 total pages.
return 2;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return "My Movies".toUpperCase(l);
case 1:
return "Add".toUpperCase(l);
}
return null;
}
}
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public static class MyMovies extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Rootview is the fragment layout, fragment_main_dummy.xml in layouts
View rootView = inflater.inflate(R.layout.fragment_main_dummy, container, false);
return rootView;
}
}
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public static class AddMovies extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Rootview is the fragment layout, fragment_main_dummy.xml in layouts
final View rootView = inflater.inflate(R.layout.fragment_form, container, false);
final LinearLayout listViewData = (LinearLayout) rootView.findViewById(R.id.listViewData);
// Create button
Button bt = (Button) rootView.findViewById(R.id.addmovie);
bt.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
EditText inputfield = (EditText) rootView.findViewById(R.id.imdblink);
String sTitle = inputfield.getText().toString().trim().replace(' ', '+');
if(MainActivity.hasActiveInternetConnection(getActivity())){
try{
listViewData.removeAllViews();
LoadMovies LoadMovies = new LoadMovies(getActivity());
LoadMovies.execute("http://imdbapi.org/?title="+sTitle+"&type=json&plot=simple&limit=10&lang=en-US&release=simple&mt=M");
}catch(Exception e){
e.printStackTrace();
}
}else{
showWarning("No working internet connection found!","Please ensure that you have a working internet connection before searching for movies.",getActivity());
}
}
});
return rootView;
}
}
public static class LoadMovies extends AsyncTask<String, Void, List<LinearLayout>> {
private Context SubContext;
private ProgressDialog pd;
public LoadMovies(Context SubContext){
this.SubContext = SubContext;
}
@Override
protected void onPreExecute() {
pd = ProgressDialog.show(this.SubContext, "", "Loading. Please wait...", true);
}
@Override
protected List<LinearLayout> doInBackground(String... urls) {
StringBuilder builder = new StringBuilder(1000000);
List<LinearLayout> localArrayList = new ArrayList<LinearLayout>();
for (String url : urls) {
Log.v("URLS",url);
if(url != "" && url != null){
try {
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(url);
HttpResponse response = client.execute(request);
InputStream in = response.getEntity().getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
String line = null;
while((line = reader.readLine()) != null)
{
builder.append(line);
}
in.close();
String sHtml = builder.toString();
// Change json slightly...
sHtml = "{ \"Movies\": "+sHtml+" }";
JSONObject json = new JSONObject(sHtml);
JSONArray jsa = json.getJSONArray("Movies");
for(int i = 0; i < jsa.length(); i++){
JSONObject c = jsa.getJSONObject(i);
if(c.has("poster")){
String sImageUrl = c.getString("poster");
try{
ImageView imdbimg = new ImageView(this.SubContext);
URL imgUrl = new URL(sImageUrl.replaceAll(" ", "%20"));
Bitmap bmp = BitmapFactory.decodeStream(imgUrl.openConnection().getInputStream());
imdbimg.setImageBitmap(bmp);
imdbimg.setAdjustViewBounds(true);
imdbimg.setMaxHeight(200);
imdbimg.setMaxWidth(135);
imdbimg.setPadding(0, 0, 20, 0);
LinearLayout dynLL1 = new LinearLayout(this.SubContext);
LinearLayout.LayoutParams LLparams1 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
dynLL1.setOrientation(LinearLayout.VERTICAL);
dynLL1.setLayoutParams(LLparams1);
TextView textView1 = new TextView(this.SubContext);
textView1.setTextColor(Color.parseColor("#000000"));
textView1.setTextSize(18);
textView1.setPadding(0, 10, 20, 10);
textView1.setText(c.getString("title"));
TextView textView2 = new TextView(this.SubContext);
textView2.setText("Year: "+c.getString("year"));
JSONArray aRuntime = c.getJSONArray("runtime");
TextView textView3 = new TextView(this.SubContext);
textView3.setText("Length: "+aRuntime.getString(0));
dynLL1.addView(textView1);
dynLL1.addView(textView2);
dynLL1.addView(textView3);
LinearLayout dynLL2 = new LinearLayout(this.SubContext);
LinearLayout.LayoutParams LLparams2 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
LLparams2.setMargins(20, 20, 20, 20);
dynLL2.setOrientation(LinearLayout.HORIZONTAL);
dynLL2.setLayoutParams(LLparams2);
dynLL2.setBackgroundColor(Color.parseColor("#ffffff"));
dynLL2.addView(imdbimg);
dynLL2.addView(dynLL1);
localArrayList.add(dynLL2);
}catch(Exception e){
e.printStackTrace();
}
}
};
} catch (Exception e) {
e.printStackTrace();
}
}
}
return localArrayList;
}
@Override
protected void onPostExecute(List<LinearLayout> localArrayList) {
LinearLayout listViewData = (LinearLayout) ((Activity) this.SubContext).findViewById(R.id.listViewData);
for (final LinearLayout dynLL : localArrayList) {
listViewData.addView(dynLL);
}
pd.dismiss();
}
}
public static boolean hasActiveInternetConnection(Context SubContext) {
if (isNetworkAvailable(SubContext)) {
try {
HttpURLConnection urlc = (HttpURLConnection) (new URL("http://www.google.com").openConnection());
urlc.setRequestProperty("User-Agent", "Test");
urlc.setRequestProperty("Connection", "close");
urlc.setConnectTimeout(1500);
urlc.connect();
return (urlc.getResponseCode() == 200);
} catch (IOException e) {
Log.e("ERROR: ", "Error checking internet connection", e);
}
} else {
Log.d("ERROR: ", "No network available!");
}
return false;
}
private static boolean isNetworkAvailable(Context SubContext) {
ConnectivityManager connectivityManager = (ConnectivityManager) SubContext.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null;
}
public static void showWarning(String title, String mymessage,Context context)
{
new AlertDialog.Builder(context)
.setMessage(mymessage)
.setTitle(title)
.setCancelable(true)
.setIcon(R.drawable.warning)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
//do things
}
})
.show();
}
}
答案 0 :(得分：1)
这些可能是一个很长的答案，但最好阅读Fragments
处的片段部分建议清理事务使用接口从片段回调Activity以运行AsyncTask。将片段保存在单独的类中。然后我会发送一个intent或返回一个ArrayList，其中ofMoviedata实现了Parcelable。将该列表保存在MainActivity的onSaveInstance回调中，并附加了一个额外的ArrayList。在同一个地方为您保存ViewPager所选索引的位置。
所以在你的 @覆盖 onCreate（Bundle savedInstancestate）{ //你可以查一下 if（savedInstanceState == null）{ //意味着新负载执行你的初始化
}else{
//means orientation change grab the stuff you want saved to recreate the UI
if(savedInstanceState.containsKey(EXTRA_LIST){
mList = savedInstanceState.getParcelableArrayList(EXTRA_LIST)
}
if(savedInstancestate.containsKey(EXTRA_INDEX){
this.mDisplayedIndex = savedInstanceState.getInt(EXTRA_DISPLAYED_INDEX);
}
}
你的onSaveInstanceState看起来像下面这样：
@Override
protected void onSaveInstanceState(Bundle outState){
outState.putInt(EXTRA_DISPLAYED_INDEX, mDisplayedIndex);
outState.putParcelableArrayList(EXTRA_APPS_LIST, mList);
super.onSaveInstanceState(outState);
}
这是处理方向变化的一些基本内容。看看这个是为了更好地回答在方向更改期间实际保存片段。 another answer抱歉，我不能不再需要重新开始工作。但这应该会帮助你走上我希望的道路。