Question

我正在尝试动态设置文本视图的text属性。但让应用程序部队关闭。我的下面的代码有什么问题？

public class DataStorageActivity extends Activity {
    /** Called when the activity is first created. */


    public static final String PREFS_NAME = "MyPrefsFile";



    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


        SharedPreferences settings = getSharedPreferences(PREFS_NAME,0);

        SharedPreferences.Editor editor=settings.edit();

        editor.putInt("myValue", 7);

        editor.commit();

        TextView tv=(TextView)findViewById(R.id.textView);

       int value=settings.getInt("myValue", 0);

        tv.setText(value);

    }
}

修改

根据@agamov我已经解决了上述问题。但是，即使将字符串类型传递给setText方法，我也遇到了与下面代码相同的问题。这有什么问题？

public class InternalStorageActivity extends Activity {

    public String fileName="HelloFile";

    public TextView textview;

     @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


        String helloString="Hello";
        byte[] b = null;

        try {
            FileOutputStream fos=openFileOutput(fileName, MODE_PRIVATE);

            fos.write(helloString.getBytes());

            fos.close();

            FileInputStream fis=openFileInput(fileName);
            fis.read(b);
            String input=b.toString();

            textview=(TextView)findViewById(R.id.textView);

            textview.setText(input);

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

}

Answer 1

您正在将int传递给TextView。这应该可以解决你的错误：

int value=settings.getInt("myValue", 0);
tv.setText("" + value);

从共享首选项中检索的值不能按预期工作

1 个答案: