Question

我希望在活动销毁时保存并恢复用户详细信息。我已经搜索了一段时间，但我尝试了代码，但它不起作用。代码看起来正确但它仍然无法正常工作。当我的活动被销毁并且我再次创建它时，它不会显示我保存的内容。这是XML

 <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.gigabytedevelopersinc.savedpractice.MainActivity">

<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="Type here"
    android:id="@+id/txtone"
    android:gravity="center"
    android:layout_marginTop="150sp"
    android:layout_marginLeft="90sp"
    android:freezesText="true"
    android:saveEnabled="true"/>


  </RelativeLayout>

这是Java

 package com.gigabytedevelopersinc.savedpractice;

 import android.os.PersistableBundle;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.widget.EditText;

public class MainActivity extends AppCompatActivity {
private EditText firstEdit;
private String storeFirst = "STORE_FIRST";
private String editstore ;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    firstEdit = (EditText)findViewById(R.id.txtone);


}



@Override
public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {
    super.onSaveInstanceState(outState, outPersistentState);
    firstEdit = (EditText)findViewById(R.id.txtone);


    outState.putString(storeFirst,firstEdit.getText().toString());


}

     @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    firstEdit = (EditText)findViewById(R.id.txtone);

    firstEdit.setText(savedInstanceState.getString(storeFirst));



     }
 }

如何使用保存的实例状态恢复活动

0 个答案: