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Android example source code file (GridThrasher.java)

This example Android source code file (GridThrasher.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

activity, android, app, baseadapter, content, gridview, handler, layoutinflater, object, os, override, position, random, runnable, string, textview, thrashlistadapter, ui, view, widget

The GridThrasher.java Android example source code

/*
 * 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.
 */

package android.widget.gridview;

import com.android.frameworks.coretests.R;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.ViewGroup;
import android.view.LayoutInflater;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.TextView;

import java.util.Random;

/**
 * Exercises change notification in a list
 */
public class GridThrasher extends Activity implements AdapterView.OnItemSelectedListener
{
    Handler mHandler = new Handler();
    ThrashListAdapter mAdapter;
    Random mRandomizer = new Random();
    TextView mText;
    
    Runnable mThrash = new Runnable() {
        public void run() {
            mAdapter.bumpVersion();
            mHandler.postDelayed(mThrash, 500);
        }
    };

    private class ThrashListAdapter extends BaseAdapter {
        private LayoutInflater mInflater;
        
        /**
         * Our data, part 1.
         */
        private String[] mTitles = new String[100];
        
        /**
         * Our data, part 2.
         */
        private int[] mVersion = new int[100];

        public ThrashListAdapter(Context context) {
            mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            mTitles = new String[100];
            mVersion = new int[100];
            
            int i;
            for (i=0; i<100; i++) {
                mTitles[i] = "[" + i + "]";
                mVersion[i] = 0;
            }
        }

        public int getCount() {
            return mTitles.length;
        }

        public Object getItem(int position) {
            return position;
        }

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

        public View getView(int position, View convertView, ViewGroup parent) {
            TextView view;

            if (convertView == null) {
                view = (TextView) mInflater.inflate(android.R.layout.simple_list_item_1, null);
            } else {
                view = (TextView) convertView;
            }
            view.setText(mTitles[position] + " " + mVersion[position]);
            return view;
        }

        
        public void bumpVersion() {
            int position = mRandomizer.nextInt(getCount());
            mVersion[position]++;
            notifyDataSetChanged();
        }
             

    }
    
    @Override
    public void onCreate(Bundle icicle) 
    {
        super.onCreate(icicle);
        
        setContentView(R.layout.grid_thrasher);
        
        mText = (TextView) findViewById(R.id.text);
        mAdapter = new ThrashListAdapter(this);
        GridView g = (GridView) findViewById(R.id.grid);
        g.setAdapter(mAdapter);
        
        mHandler.postDelayed(mThrash, 5000);
        
        g.setOnItemSelectedListener(this);
    }

    public void onItemSelected(AdapterView parent, View v, int position, long id) {
        mText.setText("Position " + position);
    }

    public void onNothingSelected(AdapterView parent) {
        mText.setText("Nothing");
    }
}

Other Android examples (source code examples)

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