java - 如何在 TextView 中动态显示字符串列表中的项目

Question

我想将列表中的项目显示给 TextView 。

wordlist.java 是

public class WordsList {
List<String> set1 = new ArrayList<>(Arrays.asList("sane", "said",
        "dean", "ideas", "deans", "anise", "naiades", "sand", "aide",
        "dais", "saned", "aside", "sedan", "idea", "aids", "ands",
        "naiad", "aides", "naiads"));
// 19 words

List<String> set2 = new ArrayList<>(Arrays.asList("doer", "lord",
        "rode", "role", "drool", "older", "flooder", "odor", "lore",
        "rood", "fore", "rodeo", "folder", "floored", "door", "roof",
        "redo", "ford", "floor", "roofed"));
// 20 words
List<String> set3 = new ArrayList<>(Arrays.asList("mead", "dale",
        "lead", "dual", "lamed", "mauled", "medulla", "lade", "male",
        "alum", "maul", "mall", "ladle", "malled", "dame", "made", "lame",
        "laud", "meal", "medal", "allude"));
// 21 words

其实这些就是拼图的答案，大概有25个拼图(从set1到set 25)

当用户点击放弃时。它进入该 Activity 中的游戏结束 Activity ，我有按钮“显示遗漏的单词”，现在按下此按钮时，我想显示相应列表中的项目。

为了显示文字，我创建了一个带有一些 TextView 的 xml 布局。

LinearLayout myLayout;    myLayout = (LinearLayout) findViewById(R.id.tvLayout);
               myTextViewList = new ArrayList<>();

        for (int i = 0; i < myLayout.getChildCount(); i++)
            if (myLayout.getChildAt(i) instanceof TextView)
                myTextViewList.add((TextView) myLayout.getChildAt(i));

and when to set text

WordsList w = new WordsList();
    TextView tv =    myTextViewList.get(counter);
                tv.setText(w.set1);

Here is my logcat

 01-28 20:29:42.105  11122-11122/rpa.screening.spellathon E/AndroidRuntime﹕ FATAL EXCEPTION: main    Process: rpa.screening.spellathon, PID: 11122    java.lang.NullPointerException            at rpa.screening.spellathon.GameOver_Screen$2.onClick(GameOver_Screen.java:44)            at android.view.View.performClick(View.java:4487)            at android.view.View$PerformClick.run(View.java:18746)            at android.os.Handler.handleCallback(Handler.java:733)            at android.os.Handler.dispatchMessage(Handler.java:95)            at android.os.Looper.loop(Looper.java:149)            at android.app.ActivityThread.main(ActivityThread.java:5257)            at java.lang.reflect.Method.invokeNative(Native Method)            at java.lang.reflect.Method.invoke(Method.java:515)            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:817)            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:633)            at dalvik.system.NativeStart.main(Native Method)

EDIT 2 :Gameover_screen

missedWords.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent iin = getIntent();
            Bundle b = iin.getExtras();


            if (b != null) {

                String passed_score = (String) b.get("score");
                displayScore.setText(passed_score);
                int passed_set = (int) b.get("set"); // line 44
                String s = Integer.valueOf(passed_set).toString();


                Intent ii = new Intent(GameOver_Screen.this, MissedWords.class);
                ii.putExtra("sEt", s);
                startActivity(ii);
            }
        }
    });

Answer 1

解决了我的问题。

真正的问题在这里，

tv.setText(w.set1);

但是当我把它改成，

String set1 = w.set1.get(i);
tv.setText(set1);

问题解决了。