MultiSelectGridview

Some good links
=============

http://vikaskanani.wordpress.com/2011/07/20/android-custom-image-gallery-with-checkbox-in-grid-to-select-multiple/
http://stackoverflow.com/questions/14375118/gridview-item-list-selector-for-multiple-items-not-working-in-android
http://www.java2s.com/Code/Android/UI/ThisdemoillustratestheuseofCHOICEMODEMULTIPLEMODALakaselectionmodeonGridView.htm
http://www.coderzheaven.com/2013/04/26/multiple-selection-listview-android/
https://github.com/paramvir-b/AndroidGridViewCompatLib
http://www.java2s.com/Code/Android/UI/ThisdemoillustratestheuseofCHOICEMODEMULTIPLEMODALakaselectionmodeonGridView.htm


1)Create class MainActivity.java
===========================
package com.coderzheaven.multipleselectiongrid;

import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Checkable;
import android.widget.FrameLayout;
import android.widget.GridView;
import android.widget.ImageView;

public class MainActivity extends Activity {

GridView mGrid;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

loadApps();

setContentView(R.layout.grid_1);
mGrid = (GridView) findViewById(R.id.myGrid);
mGrid.setAdapter(new AppsAdapter());
mGrid.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE_MODAL);
mGrid.setMultiChoiceModeListener(new MultiChoiceModeListener());
}

private List mApps;

private void loadApps() {
Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);

mApps = getPackageManager().queryIntentActivities(mainIntent, 0);
}

public class AppsAdapter extends BaseAdapter {
public AppsAdapter() {
}

public View getView(int position, View convertView, ViewGroup parent) {
CheckableLayout l;
ImageView i;

if (convertView == null) {
i = new ImageView(MainActivity.this);
i.setScaleType(ImageView.ScaleType.FIT_CENTER);
i.setLayoutParams(new ViewGroup.LayoutParams(50, 50));
l = new CheckableLayout(MainActivity.this);
l.setLayoutParams(new GridView.LayoutParams(
GridView.LayoutParams.WRAP_CONTENT,
GridView.LayoutParams.WRAP_CONTENT));
l.addView(i);
} else {
l = (CheckableLayout) convertView;
i = (ImageView) l.getChildAt(0);
}

ResolveInfo info = mApps.get(position);
i.setImageDrawable(info.activityInfo.loadIcon(getPackageManager()));

return l;
}

public final int getCount() {
return mApps.size();
}

public final Object getItem(int position) {
return mApps.get(position);
}

public final long getItemId(int position) {
return position;
}
}

public class CheckableLayout extends FrameLayout implements Checkable {
private boolean mChecked;

public CheckableLayout(Context context) {
super(context);
}

@SuppressWarnings("deprecation")
public void setChecked(boolean checked) {
mChecked = checked;
setBackgroundDrawable(checked ? getResources().getDrawable(
R.drawable.blue) : null);
}

public boolean isChecked() {
return mChecked;
}

public void toggle() {
setChecked(!mChecked);
}

}

public class MultiChoiceModeListener implements
GridView.MultiChoiceModeListener {
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
mode.setTitle("Select Items");
mode.setSubtitle("One item selected");
return true;
}

public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return true;
}

public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
return true;
}

public void onDestroyActionMode(ActionMode mode) {
}

public void onItemCheckedStateChanged(ActionMode mode, int position,
long id, boolean checked) {
int selectCount = mGrid.getCheckedItemCount();
switch (selectCount) {
case 1:
mode.setSubtitle("One item selected");
break;
default:
mode.setSubtitle("" + selectCount + " items selected");
break;
}
}

}
}

2)Create activity_main.xml

====================

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity" >

   

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"

        android:text="@string/hello_world" />

3)Create grid_1.xml

================

android:layout_width="match_parent" 

android:layout_height="match_parent"

    android:padding="10dp"

    android:verticalSpacing="10dp"

    

    android:horizontalSpacing="10dp"

    android:numColumns="auto_fit"

    android:columnWidth="60dp"

    android:stretchMode="columnWidth"

    

    android:gravity="center"

    />