屏幕方向切换时保存和恢复 ButtonText
和 Android 中一样，每次屏幕翻转到纵向/横向模式时，Activity 都会经历从 onSaveInstanceState 到 onDestroy 的生命周期，然后重新创建。
在我的活动中，有一个可由用户更改的 ButtonText。它已重置为初始状态，但我必须以某种方式保存最后一个状态。我怎样才能实现这一点，我必须重写 onSaveInstanceState 吗？有人可以举个例子吗？
As usual in android, each time the screen is flipped to portrait/landscape mode an Activity runs through life-cycle from onSaveInstanceState to onDestroy and then is recreated.
In my Activity there's a ButtonText which can be changed by the user. It's reseted to the initial state, but I have to save the last state somehow. How can I achieve that, will I have to override onSaveInstanceState? Can someone show an example?
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我遇到了同样的问题，并期望默认实现能够恢复按钮的文本。不幸的是没有。最后我找到了属性 android:freezesText 和方法 setFreezesText(boolean)。当设置为 true 时，按钮将自动恢复其文本。
请参阅Button的超类TextView的参考：http://developer. android.com/reference/android/widget/TextView.html#attr_android:freezesText
I had the same problem and expected that the default implementation would take care of restoring a button's text. Unfortunately it did not. Finally I found the attribute android:freezesText respectively the method setFreezesText(boolean). When set to true the button will restore its text automatically.
See the reference of Button's super class TextView: http://developer.android.com/reference/android/widget/TextView.html#attr_android:freezesText
步骤#1：在
Button上调用getText().toString()以获取标题。步骤 #2：在传递给
onSaveInstanceState()实现的Bundle上调用putString()以存储标题。步骤#3：在传递给
onRestoreInstanceState()实现的Bundle上调用getString()（或在onCreate()< /code>，如果将标题放回原位。Bundle不是null（如果您愿意））要取回您的标题，然后在setText()上调用setText()code>Button这里是一个示例项目，它使用
onSaveInstanceState()保存联系人的Uri（这也会影响Button是否为已启用）。Step #1: Call
getText().toString()on theButtonto get the caption.Step #2: Call
putString()on theBundlepassed to your implementation ofonSaveInstanceState()to store the caption.Step #3: Call
getString()on theBundlepassed to your implementation ofonRestoreInstanceState()(or inonCreate(), if theBundleis notnull, if you wish) to get your caption back, then callsetText()on yourButtonto put the caption back in.Here is a sample project that uses
onSaveInstanceState()to save aUriof a contact (which also affects whether or not aButtonis enabled).