Android Compound Custom View恢复保存状态

我创建了包含TextView并EditText称为的复合自定义视图LabledEditText，因为在一个片段中将有很多EditText字段。

我创建了一个包含以下内容的XML文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linearLayoutLabeledEditText"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/label_textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/label"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <EditText
        android:id="@+id/value_editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:freezesText="true"
        android:saveEnabled="true"/>
</LinearLayout>

并且在View类中如下

public class LabeledEditText extends LinearLayout {
    private EditText editText;
    private TextView label;

    public LabeledEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
        inflate(context,R.layout.labeled_edit_text, this);
        label = (TextView) this.findViewById(R.id.label_textView);
        label.setText("some label");
        editText = (EditText) this.findViewById(R.id.value_editText);
    }

    protected void onRestoreInstanceState(Parcelable state) {
        String id= this.getId()+" ";
        if (state instanceof Bundle) // implicit null check
        {
            Bundle bundle = (Bundle) state;
            state = bundle.getParcelable(id+"super");
            super.onRestoreInstanceState(state);
            editText.setText(bundle.getString(id+"editText"));
        }
    }

    protected Parcelable onSaveInstanceState() {
        String id= this.getId()+" ";
        Bundle bundle = new Bundle();
        bundle.putParcelable(id+"super",super.onSaveInstanceState());
        bundle.putString(id+"editText",editText.getText().toString());
        return bundle;
    }   
}

然后将其用在代表3个步骤的3个片段中。当我在前1个步骤/片段中插入值时

然后切换到其他片段，然后再次返回到第1步/片段，我发现以下内容

是什么引起了这个问题？

我已经调试了至少5天，请记住，在片段布局中使用这些自定义视图时，每个视图都有不同的ID。

在保存状态的过程中，我还尝试过将自定义视图的ID作为键的一部分添加，this.getId()+"editText"仍然存在相同的问题。

编辑api <17的genrateViewId

修改后的代码

import java.util.concurrent.atomic.AtomicInteger;

public class LabeledEditText extends LinearLayout {
    private EditText editText;
    private TextView label;

    public LabeledEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
        inflate(context,R.layout.labeled_edit_text, this);
        label = (TextView) this.findViewById(R.id.label_textView);
        editText = (EditText) this.findViewById(R.id.value_editText);
        editText.setId(generateViewId());
        applyAttr(context,attrs);
    }

    @Override
    protected Parcelable onSaveInstanceState() {
        Bundle bundle = new Bundle();
        //adding the id of the parent view as part of the key so that
        //editText state won't get overwritten by other editText 
        //holding the same id
        bundle.putParcelable("super",super.onSaveInstanceState());
        bundle.putString("editText",editText.getText().toString());
        return bundle;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (state instanceof Bundle) // implicit null check
        {
            Bundle bundle = (Bundle) state;
            state = bundle.getParcelable("super");
            super.onRestoreInstanceState(state);
            editText.setText(bundle.getString("editText"));
        }
    }

    private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1);

    public static int generateViewId() {
        for (;;) {
            final int result = sNextGeneratedId.get();
            // aapt-generated IDs have the high byte nonzero; clamp to the range under that.
            int newValue = result + 1;
            if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0.
            if (sNextGeneratedId.compareAndSet(result, newValue)) {
                return result;
            }
        }
    }
}