Orientation change does not redraw layout completely
This is a Major Edit on my previous question
I'm creating a custom (composite) component named OneLineSeeker that consists of a TextView and a SeekBar.
When I have multiple OneLineSeekers declared in a layout, they don't retain their state on configuration change. All seeker thumbs assume the same position (the position of the last OneLineSeeker) on configuration change.
If I don't use the custom component and use only SeekBars individually (uncomment //a()
in main activity), they will retain their individual positions on configuration change.
Can anyone help?
src files
A_seekbarsActivity.java
package com.an;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.SeekBar;
public class A_seekbarsActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//a();
}
void a() {
setContentView(R.layout.main_1);
Butto开发者_运维技巧n b = (Button) findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
SeekBar sb = (SeekBar) findViewById(R.id.seekBar1);
if(sb.getProgress() > 50) sb.setProgress(0);
else sb.incrementProgressBy(5);
}
});
}
}
OneLineSeeker.java
package com.an;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
public class OneLineSeeker extends LinearLayout {
public OneLineSeeker(Context context, AttributeSet attrs) {
super(context, attrs);
View ols = LayoutInflater.from(context).inflate(R.layout.one_line_seeker, this, true);
TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.OneLineSeeker, 0, 0);
String text = array.getString(R.styleable.OneLineSeeker_name);
if (text != null)
((TextView) ols.findViewById(R.id.name)).setText(text);
array.recycle();
}
}
res/layout files
main_1.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<SeekBar android:id="@+id/seekBar1" android:layout_height="wrap_content" android:layout_width="match_parent"></SeekBar>
<SeekBar android:id="@+id/seekBar2" android:layout_height="wrap_content" android:layout_width="match_parent"></SeekBar>
<SeekBar android:id="@+id/seekBar3" android:layout_height="wrap_content" android:layout_width="match_parent"></SeekBar>
<Button android:text="Button" android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
</LinearLayout>
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:oneLineSeeker="http://schemas.android.com/apk/res/com.an"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<com.an.OneLineSeeker
android:id="@+id/s1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
oneLineSeeker:name="1"
/>
<com.an.OneLineSeeker
android:id="@+id/s2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
oneLineSeeker:name="2"
/>
<com.an.OneLineSeeker
android:id="@+id/s3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
oneLineSeeker:name='3'
/>
</LinearLayout>
one_line_seeker.xml
<?xml version="1.0" encoding="utf-8"?>
<merge
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id='@+id/name'
android:text='name'
/>
<SeekBar
android:id='@+id/seekbar'
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</merge>
res/values files
attrs.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="OneLineSeeker">
<attr name="name" format="string"/>
</declare-styleable>
</resources>
Its not supposed to reset its position to zero. This is actually a feature. When view has id
associated with, it usually saves and the restores its state on configuration changes.
If you don't want specific view to save state on configuration change, you can remove android:id
from view's entry in layout (but you won't be able to control that view then). Another alternative is to extend ProgressBar
and disable its ability to restore state.
The last one option is the easiest one: override onRestoreInstanceState()
and reset state there:
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState)
{
super.onRestoreInstanceState(savedInstanceState);
bar.setProgress(0);
}
But I would strongly recommend not resetting view state. After all the whole idea of restoring state on configuration change is to make user think as if nothing really changed. And you need to have very strong reasons to disable this behavior.
In that u have to define Orientation Change Methods.....
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
onCreate(null);
}
Try this Code may u get any Help.....
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