StackOverflow2013

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19386258
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2013-10-15T16:25:07.213
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2013-10-15T16:25:07.213
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The key for save / restore is a unique id. Only views with id set (either on xml files or dynamically created) can hold their state on configuration changes, such as device rotation. File CustomTextView.java <pre><code>package example; import android.content.Context; import android.os.Bundle; import android.os.Parcelable; import android.util.AttributeSet; import android.widget.TextView; public class CustomTextView extends TextView { private static final String INSTANCE_STATE = "instance_state"; private static final String VALUE = "value"; private int value; public CustomTextView(Context context) { this(context, null); } public CustomTextView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public CustomTextView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // init ... setId(R.id.custom_view); value = 123; } // methods ... @Override public Parcelable onSaveInstanceState() { Bundle bundle = new Bundle(); bundle.putParcelable(INSTANCE_STATE, super.onSaveInstanceState()); bundle.putInt(VALUE, value); // other fields... return bundle; } @Override public void onRestoreInstanceState(Parcelable state) { if (state instanceof Bundle) { Bundle bundle = (Bundle) state; value = bundle.getInt(VALUE); // other fields... state = bundle.getParcelable(INSTANCE_STATE); } super.onRestoreInstanceState(state); } } </code></pre> An easy way to get a unique id is statically. File ids.xml (in res/values) <pre><code><?xml version="1.0" encoding="utf-8"?> <resources> <item type="id" name="custom_view" /> </resources> </code></pre>
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1. POAndroid - How to save a programmatically created view and restore it on app restart
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1. PTAnswer
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1. USKitKat
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