文艺式ListView and adapter

[KnightBubble]

package com.example.androidstudytest;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class MyArrAdapter extends BaseAdapter {
    private LayoutInflater inflater;
    private List<NewsBean> arrList;
    public MyArrAdapter(Context context, List<NewsBean> newsList) {
        inflater = LayoutInflater.from(context);
        arrList = newsList;
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return arrList.size();
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return arrList.get(position);
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder ;
        if (convertView == null) {
            viewHolder = new ViewHolder();
            convertView = inflater.inflate(R.layout.item, null);
            viewHolder.imageView = (ImageView) convertView.findViewById(R.id.image_v);
            viewHolder.tvTitle = (TextView) convertView.findViewById(R.id.news_title);
            viewHolder.tvContent = (TextView)convertView.findViewById(R.id.news_content);
            convertView.setTag(viewHolder);
        }
        else {
            viewHolder = (ViewHolder) convertView.getTag();
            NewsBean news = arrList.get(position);
            viewHolder.imageView.setImageResource(news.newsSrc);
            viewHolder.tvTitle.setText(news.newsTitle);
            viewHolder.tvContent.setText(news.newsContent);
        }
        return convertView;
    }
    class ViewHolder {
        public ImageView imageView;
        public TextView tvTitle;
        public TextView tvContent;

    }

}

[KnightBubble]

mainActivity

package com.example.androidstudytest;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

import android.annotation.SuppressLint;
import android.app.ActionBar;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ListView;
import android.widget.Toast;

@SuppressLint("NewApi")
public class MainActivity extends Activity {

    public List<NewsBean> newsList ;
    public MyArrAdapter myDapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ActionBar abar = getActionBar();
        abar.setDisplayHomeAsUpEnabled(true);  
        setOverflowShowingAlways(); 

        newsList = new ArrayList<NewsBean>() ;
        for (int i =0;i<20;i++) {
            newsList.add(new NewsBean(R.drawable.avatar,"我是标题"+i,"我是内容"+i));
        }
        ListView lv = (ListView) findViewById(R.id.lv);
        myDapter = new MyArrAdapter(this,newsList);
        lv.setAdapter(myDapter);

        lv.setOnScrollListener(new OnScrollListener() {

            private Boolean flag = false;
            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
                // TODO Auto-generated method stub
                if (flag) {
                    newsList.add(new NewsBean(R.drawable.avatar,"==我是标题","==我是内容"));
                    myDapter.notifyDataSetChanged();
                }

            }

            @Override
            public void onScroll(AbsListView view, int firstVisibleItem,
                    int visibleItemCount, int totalItemCount) {
                if (firstVisibleItem + visibleItemCount >= totalItemCount ) {
                    flag = true;
                }
            }
        });

    }
    /**
     * 展示overflow中折叠按钮
     */
    private void setOverflowShowingAlways() {  
        try {  
            ViewConfiguration config = ViewConfiguration.get(this);  
            Field menuKeyField = ViewConfiguration.class.getDeclaredField("sHasPermanentMenuKey");  
            menuKeyField.setAccessible(true);  
            menuKeyField.setBoolean(config, false);  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    /**
     * menuitem click
     * @param item
     * @return
     */
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch(item.getItemId()) {
            case android.R.id.home:
                finish();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }
    @SuppressLint("NewApi")
    public void clickYourName(View view) {
        myDialogFragment mdf = new myDialogFragment();
        mdf.show(getFragmentManager(), "justTest");
    }

    public void readSharedPre(View view) {
        SharedPreferences spf = getPreferences(Context.MODE_PRIVATE);
        String myName = spf.getString("myName", "it is just empty");
        Toast.makeText(this, myName, 1).show();
    }

    public void writeSharedPre(View view){
        SharedPreferences spf =  getPreferences(Context.MODE_PRIVATE);
        Editor editor = spf.edit();
        editor.putString("myName", "shibiao");
        boolean flag = editor.commit();
        if (flag) {
            Toast.makeText(this, "success", 1).show();
        }
        else {
            Toast.makeText(this, "fail", 1).show();
        }
    }

    @SuppressLint("ShowToast")
    public void writeData(View view) {
//      Toast.makeText(this, "test", 1).show();
        FileOutputStream fos = null;
        try {
            fos = openFileOutput("text.txt", Context.MODE_PRIVATE);
            fos.write(new String("hello world").toString().getBytes());
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            Toast.makeText(this, "write data ok", 1).show();
        }
    }
    public void writeData2(View view){
        File file = new File(getFilesDir(),"tes2.txt");
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(file);
            try {
                fos.write(new String("hello shibiao").toString().getBytes());
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }finally{
             if (fos != null) {
                 try {
                    fos.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
             }
        }
    }

    public void readData1(View view) {
        FileInputStream fis = null;
        StringBuilder sb = new StringBuilder();
        BufferedReader br  = null;
        try {
            fis  = openFileInput("text.txt");
            br = new BufferedReader(new InputStreamReader(fis));
            String line = null;
            try {
                while ( (line = br.readLine())!= null) {
                    sb.append(line);
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            Toast.makeText(this, sb.toString(), 1).show();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally{
            if (br!= null) {
                try {
                    br.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }

}