Question

请查看我的代码。如你所见，它有一个editText及其功能 - 它在editText中保存文本。我在网上找到了这个代码。它与我的布局完美配合。但是我添加了另一个editText框，我调用了editText2并且无法弄清楚如何对其进行编码。如何在第二个文本中保存文本呢？我需要在src中创建一个新类吗？我知道我必须添加editText2和editBox2，但是如何以及在哪里？有人可以给我一个样本，所以我可以将它用于整个代码吗？例如，on protected void onCreate-如何添加editText2？谢谢！

package tryone.now.forfreenow;
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.EditText;
import android.widget.TextView;
public class notepad extends Activity
{
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    editBox =(EditText)findViewById(R.id.editText1);
}
protected void onResume() {
    super.onResume();
    SharedPreferences prefs = getPreferences(0); 
    String restoredText = prefs.getString("text", null);
    if (restoredText != null) {
        editBox.setText(restoredText, TextView.BufferType.EDITABLE);
        int selectionStart = prefs.getInt("selection-start", -1);
        int selectionEnd = prefs.getInt("selection-end", -1);
        if (selectionStart != -1 && selectionEnd != -1) {
            editBox.setSelection(selectionStart, selectionEnd);
        }
    }
}
protected void onPause() {
    super.onPause();
    SharedPreferences.Editor editor = getPreferences(0).edit();
    editor.putString("text", editBox.getText().toString());
    editor.putInt("selection-start", editBox.getSelectionStart());
    editor.putInt("selection-end", editBox.getSelectionEnd());
    editor.commit();
}
private EditText editBox;

}

Answer 1

您需要了解有关布局和UI小部件的一些基础知识。 editBox1在main.xml目录下的res\layout中定义。打开该文件并查看editBox1，复制代码并将id更改为editBox2。然后在onCreate()中添加代码editBox2 =(EditText)findViewById(R.id.editText2); 获得参考

Answer 2

我正在回答我自己的问题。它可以100％在两个editText框上保存状态。

package tryone.now.forfreenow;
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.EditText;
import android.widget.TextView;
public class notepad extends Activity
{
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    editBox =(EditText)findViewById(R.id.editText1);
    editBox2 =(EditText)findViewById(R.id.editText2);
  }
  protected void onResume() {
    super.onResume();

    SharedPreferences prefs = getPreferences(0); 
    String restoredText = prefs.getString("text", null);
    if (restoredText != null) 
    {
        editBox.setText(restoredText, TextView.BufferType.EDITABLE);

        int selectionStart = prefs.getInt("selection-start", -1);
        int selectionEnd = prefs.getInt("selection-end", -1);
        if (selectionStart != -1 && selectionEnd != -1) 
        {
            editBox.setSelection(selectionStart, selectionEnd);
        }
        SharedPreferences prefs2 = getPreferences(1); 
        String restoredText2 = prefs2.getString("text2", null);
        if (restoredText2 != null) 
        {
            editBox2.setText(restoredText2, TextView.BufferType.EDITABLE);

            int selectionStart2 = prefs2.getInt("selection-start2", -1);
            int selectionEnd2 = prefs2.getInt("selection-end2", -1);
            if (selectionStart2 != -1 && selectionEnd2 != -1) 
            {
                editBox2.setSelection(selectionStart2, selectionEnd2);
            }
        }
    }
}

 protected void onPause() {
    super.onPause();

    SharedPreferences.Editor editor = getPreferences(0).edit();
    editor.putString("text", editBox.getText().toString());
    editor.putInt("selection-start", editBox.getSelectionStart());
    editor.putInt("selection-end", editBox.getSelectionEnd());
    editor.commit();

    SharedPreferences.Editor editor2 = getPreferences(1).edit();
    editor2.putString("text2", editBox2.getText().toString());
    editor2.putInt("selection-start2", editBox2.getSelectionStart());
    editor2.putInt("selection-end2", editBox2.getSelectionEnd());
    editor2.commit();
}

 private EditText editBox;
 private EditText editBox2;
 }

如何为editText2框添加代码？

2 个答案: