橫向模式下的活動破壞

Question

嗨，我已經意識到 android 上的劊子手游戲，它在縱向模式下運行良好，但是當我切換到橫向模式時，它正在破壞活動並且我丟失了我寫的正確字母，以及我寫的整個字母已經寫了（正確和錯誤）和圖像視圖。 我想知道是否有人可以告訴我是否需要將這些字母存儲在外部文本文件中，或者是否有其他方法？ 有人可以告訴我如何處理 imageview 嗎？

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private LinearLayout container;
private Button btn_send;
private TextView lettres_tapees;
private ImageView image;
private EditText et_letter;
private String word;
private int found;
private int error ;
private List<Character> listOfLetters= new ArrayList<>();
private boolean win;
private List<String> wordlist= new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        container= (LinearLayout) findViewById(R.id.word_container);
        btn_send= (Button)findViewById(R.id.btn_send);
        et_letter= (EditText) findViewById(R.id.et_letter);
        image= (ImageView) findViewById(R.id.iv_pendu);
        lettres_tapees=(TextView)findViewById(R.id.tv_lettres_tapees);
        initGame();
        btn_send.setOnClickListener(this);
    }
    public void initGame(){
        word=generateword();
        win =false;
        error=0;
        found=0;
        lettres_tapees.setText("");
        image.setBackgroundResource(R.drawable.first);
        listOfLetters= new ArrayList<>();
        container.removeAllViews();
        for(int i=0;i<word.length();i++){
            TextView oneletter = (TextView) getLayoutInflater().inflate(R.layout.textview,null);
            container.addView(oneletter);
        }
    }

    @Override
    public void onClick(View view) {
        String letterfrominput= et_letter.getText().toString().toUpperCase();
        et_letter.setText("");
        if(letterfrominput.length()>0){
            if(!letterAlreadyused(letterfrominput.charAt(0),listOfLetters)){
                listOfLetters.add(letterfrominput.charAt(0));
                checkifletterisinword(letterfrominput,word);
            }
            //la partie est gagnée
            if(found==word.length()){
                win=true;
                createDialog(win);
            }
            if(!word.contains(letterfrominput)){
                error++;
            }
            setImage(error);
            if(error==6){
                win=false;
                createDialog(win);
            }
            showAllLetters(listOfLetters);
        }
    }
    public boolean letterAlreadyused(char a , List<Character> listOfletters){
        for (int i =0; i<listOfletters.size();i++){
            if(listOfletters.get(i)==a){
                Toast.makeText(getApplicationContext(),"Vous avez deja affiche cette lettre",Toast.LENGTH_SHORT).show();
                return true;
            }
        }
        return false;

    }
    void checkifletterisinword(String letter,String Word){
        for (int i=0; i<word.length();i++){
            if(letter.equals(String.valueOf(word.charAt(i)))){
                TextView tv = (TextView) container.getChildAt(i);
                tv.setText(String.valueOf(word.charAt(i)));
                found++;
            }
        }
    }
    public void showAllLetters(List<Character> listOfletters){
        String chaine= "";
        for(int i=0;i<listOfletters.size();i++){
            chaine += listOfletters.get(i)+"\n";
        }
        if(!chaine.equals("")){
            lettres_tapees.setText(chaine);
        }
    }
    public void setImage(int error){
        switch (error){
            case 1:
            image.setBackgroundResource(R.drawable.second);
            break;
            case 2:
            image.setBackgroundResource(R.drawable.third);
            break;
            case 3:
            image.setBackgroundResource(R.drawable.fourth);
            break;
            case 4:
            image.setBackgroundResource(R.drawable.fifth);
            break;
            case 5:
            image.setBackgroundResource(R.drawable.sixth);
            break;
            case 6:
            image.setBackgroundResource(R.drawable.seventh);
            break;
        }
    }
    public void createDialog(boolean win){
        AlertDialog.Builder builder= new AlertDialog.Builder(this);
        builder.setTitle(" Vous avez gagné");
        if(!win){
            builder.setTitle(" Vous avez perdu");
            builder.setMessage(" Le mot a trouver etait : "+ word );
        }
        builder.setPositiveButton(getResources().getString(R.string.rejouer), new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {

                initGame();
            }
        });
        builder.create().show();
    }
    public List<String> getListOfWords(){
        try {
            BufferedReader buffer= new BufferedReader(new InputStreamReader(getAssets().open("pendu_liste.txt")));
            String line;
            while((line= buffer.readLine())!= null){
                wordlist.add(line);
            }
            buffer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return wordlist;
    }
    public String generateword(){
        wordlist= getListOfWords();
        int random = (int) (Math.floor(Math.random()*wordlist.size()));
        String word = wordlist.get(random).trim();
        return word;
    }
}

有代碼，用法語寫的（順便說一句，對不起，英語不好）。 有人可以幫我嗎？ 我已經嘗試了保存和恢復狀態的技巧，但不是這樣，它不起作用，我已經實現了這樣的代碼：

private static final String SELECTED_ITEM_POSITION = "ItemPosition";
private int mPosition;
private int found;
private int error ;
private List<Character> listOfLetters= new ArrayList<>();
private boolean win;
private List<String> wordlist= new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        container= (LinearLayout) findViewById(R.id.word_container);
        btn_send= (Button)findViewById(R.id.btn_send);
        et_letter= (EditText) findViewById(R.id.et_letter);
        image= (ImageView) findViewById(R.id.iv_pendu);
        lettres_tapees=(TextView)findViewById(R.id.tv_lettres_tapees);
        savedInstanceState.putInt(SELECTED_ITEM_POSITION, mPosition);
        initGame();
        btn_send.setOnClickListener(this);
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        mPosition=savedInstanceState.getInt(SELECTED_ITEM_POSITION);
    }

實際上我有這些錯誤：

2-26 20:57:20.758 29939-29939/? E/AndroidRuntime: FATAL EXCEPTION: main
                                           Process: com.example.aboukora.pendu, PID: 29939
                                           java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.aboukora.pendu/com.example.aboukora.pendu.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.os.Bundle.putInt(java.lang.String, int)' on a null object reference
                                               at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2684)
                                               at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2751)
                                               at android.app.ActivityThread.-wrap12(ActivityThread.java)
                                               at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1496)
                                               at android.os.Handler.dispatchMessage(Handler.java:102)
                                               at android.os.Looper.loop(Looper.java:154)
                                               at android.app.ActivityThread.main(ActivityThread.java:6186)
                                               at java.lang.reflect.Method.invoke(Native Method)
                                               at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
                                               at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
                                            Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.os.Bundle.putInt(java.lang.String, int)' on a null object reference
                                               at com.example.aboukora.pendu.MainActivity.onCreate(MainActivity.java:39)
                                               at android.app.Activity.performCreate(Activity.java:6684)
                                               at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
                                               at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2637)
                                               at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2751) 
                                               at android.app.ActivityThread.-wrap12(ActivityThread.java) 
                                               at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1496) 
                                               at android.os.Handler.dispatchMessage(Handler.java:102) 
                                               at android.os.Looper.loop(Looper.java:154) 
                                               at android.app.ActivityThread.main(ActivityThread.java:6186) 
                                               at java.lang.reflect.Method.invoke(Native Method) 
                                               at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889) 
                                               at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)

Answer 1

您需要使用onSaveInstanceState和onRestoreInstanceState處理應用程序中的方向更改； 在下面的這個例子中，我保存了一個 ArrayList 並在恢復我的活動時將它填充回來； 您可以查看此媒體帖子以獲取有關如何處理方向更改的更多信息；

private ArrayList<Character> usedLetters;

private static final String KEY_LETTERS = "key_letters";

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    String usedLettersStringRepresentation = getStringRepresentation(usedLetters);
    outState.putString(KEY_LETTERS, usedLettersStringRepresentation);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    String usedLettersStringRepresentation = savedInstanceState.getString(KEY_LETTERS);
    if (usedLettersStringRepresentation == null) return;
    for (int i = 0; i < usedLettersStringRepresentation.length(); i++) {
        Character character = usedLettersStringRepresentation.charAt(i);
        usedLetters.add(character);


        elements.add(0, new Simple("Letter", character.toString()));
    }

    adapter.updateElements(elements);
}

private String getStringRepresentation(ArrayList<Character> list) {
    StringBuilder builder = new StringBuilder(list.size());
    for (Character ch : list) {
        builder.append(ch);
    }
    return builder.toString();
}