This demo illustrates the use of CHOICE_MODE_MULTIPLE_MODAL, a.k.a. selection mode on GridView. : GridView « UI « Android

1. Android
2. UI
3. GridView

This demo illustrates the use of CHOICE_MODE_MULTIPLE_MODAL, a.k.a. selection mode on GridView.

 
/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.android.apis.view;

import com.example.android.apis.R;

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;

import java.util.List;

/**
 * This demo illustrates the use of CHOICE_MODE_MULTIPLE_MODAL, a.k.a. selection mode on GridView.
 */
public class Grid3 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<ResolveInfo> 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(Grid3.this);
                i.setScaleType(ImageView.ScaleType.FIT_CENTER);
                i.setLayoutParams(new ViewGroup.LayoutParams(50, 50));
                l = new CheckableLayout(Grid3.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);
        }

        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;
            }
        }

    }
}


//grid_1.xml


<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2007 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at
  
          http://www.apache.org/licenses/LICENSE-2.0
  
     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->

<GridView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/myGrid"
  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"
    />

   
  

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