java - arrayAdapter 导致应用程序强制关闭

Question

我有一个 Activity 从另一个 Activity 加载sharedPreference，并从当我编译我的应用程序时，使用 arrayAdpter 将 sharePreferenece 放入 listView 中，并强制关闭这是我的代码:

public class DawaaActivity extends Activity implements View.OnClickListener {
/** Called when the activity is first created. */
Button add;
ListView dataList;
private SharedPreferences emportPref;
String[] dawaaList;
String theName;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    initialaiz();
    emportPref = getSharedPreferences("dawaaData", MODE_PRIVATE);
    theName = emportPref.getString("subject", "no data found");
    Toast.makeText(this, theName, Toast.LENGTH_LONG).show();
    dawaaList[0] = theName;
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,dawaaList);
    dataList.setAdapter(adapter);
}

private void initialaiz() {
    // TODO Auto-generated method stub
    add = (Button) findViewById(R.id.button3);
    dataList = (ListView) findViewById(R.id.myListView);
    add.setOnClickListener(this);
}

public void onClick(View v) {
    // TODO Auto-generated method stub
    Intent data = new Intent(DawaaActivity.this,SettingActivity.class);
    startActivity(data);
}

当我制作这两行时，如果代码提示:

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,dawaaList);
    dataList.setAdapter(adapter)

应用程序运行良好

但当然不填充listView

请帮帮我

Answer 1

我认为您忘记用适当的大小初始化String[]，

而不是

String[] dawaaList;

尝试

String[] dawaaList = new String[1];

抛出异常的行是，

dawaaList[0] = theName;