/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.example.android.apis.app; // Need the following import to get access to the app resources, since this // class is in a sub-package. import com.example.android.apis.R; import android.app.Activity; import android.content.SharedPreferences; import android.os.Bundle; import android.widget.EditText; import android.widget.TextView; /** * Simple example of using persistent preferences to retain a screen's state. *
This can be used as an alternative to the normal
* onSaveInstanceState()
mechanism, if you
* wish the state to persist even after an activity is finished.
Note that using this approach requires more care, since you are sharing * the persistent state potentially across multiple instances of the activity. * In particular, if you allow a new instance of the activity to be launched * directly on top of the existing instance, the state can get out of sync * because the new instance is resumed before the old one is paused.
* *For any persistent state that is not simplistic, a content * provider is often a better choice.
* *In this example we are currently saving and restoring the state of the * top text editor, but not of the bottom text editor. You can see the difference * by editing the two text fields, then going back from the activity and * starting it again.
* *src/com.example.android.apis/app/PersistentState.java | *The Save/Restore Screen implementation | *
/res/any/layout/save_restore_state.xml | *Defines contents of the screen | *