package com.example.ex_day00;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.HashMap;
import org.apache.http.util.ByteArrayBuffer;
import org.apache.http.util.EncodingUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.transition.Visibility;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.ProgressBar;
public class MainActivity extends Activity implements OnClickListener {
String path = "http://10.0.2.2:8080/abc.txt";
ArrayList<RuanJian> ruanjian = new ArrayList<RuanJian>();
MyAsyncTask myAsyncTask;
ListView listview;
HashMap<String, Bitmap> hashBit = new HashMap<String,Bitmap>();
HashMap<String,MyAsyncTask2> myasync = new HashMap<String,MyAsyncTask2>();
EditText chongshi;
ProgressBar progressbar;
Button button;
private MyAdaper myAdaper;
private SQLiteDatabase mdb;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listview = (ListView) findViewById(R.id.listView1);
progressbar = (ProgressBar)findViewById(R.id.progressBar1);
chongshi = (EditText)findViewById(R.id.chongshi);
button = (Button)findViewById(R.id.button1);
button.setOnClickListener(this);
download();
selectSQL();
}
private void selectSQL() {
ruanjian.clear();
Cursor query = mdb.query("student", null, null, null, null, null, null);
boolean toFirst = query.moveToFirst();
while (toFirst) {
int name_index = query.getColumnIndex("name");
int desc_index = query.getColumnIndex("desc");
int imagepath_index = query.getColumnIndex("imagepath");
String name = query.getString(name_index);
String desc = query.getString(desc_index);
String imagepath = query.getString(imagepath_index);
ruanjian.add(new RuanJian(name, desc, imagepath));
toFirst = query.moveToNext();
}
myAdaper.notifyDataSetChanged();
}
private void LianJieSQL() {
MyData myData = new MyData(this);
mdb = myData.getReadableDatabase();
}
private void download() {
MyAsyncTask myAsyncTask = new MyAsyncTask();
myAsyncTask.execute(path);
LianJieSQL();
myAdaper = new MyAdaper();
listview.setAdapter(myAdaper);
}
class MyAsyncTask extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... params) {
ByteArrayBuffer arrayBuffer = new ByteArrayBuffer(50);
try {
URL url = new URL(params[0]);
URLConnection openConnection = url.openConnection();
openConnection.setConnectTimeout(3000);
openConnection.setReadTimeout(3000);
InputStream inputStream = openConnection.getInputStream();
byte[] buffer = new byte[1024];
int len = 0;
while((len = inputStream.read(buffer)) !=-1)
{
arrayBuffer.append(buffer, 0, len);
}
} catch (MalformedURLException e) {
runOnUiThread(new Runnable() {
@Override
public void run() {
chongshi.setText("读取失败1");
button.setVisibility(Button.VISIBLE);
progressbar.setVisibility(View.INVISIBLE);
}
});
e.printStackTrace();
} catch (IOException e) {
runOnUiThread(new Runnable() {
@Override
public void run() {
chongshi.setText("网络连接异常1");
button.setVisibility(Button.VISIBLE);
progressbar.setVisibility(View.INVISIBLE);
}
});
e.printStackTrace();
}
return new String(arrayBuffer.toByteArray());
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
new MyAsyncTask3().execute(result);
}
}
class MyAsyncTask3 extends AsyncTask<String, Void, Void>
{
@Override
protected Void doInBackground(String... params) {
try {
JSONArray array = new JSONArray(params[0]);
SQldelete();
//删除数据库所有数据delete
for (int i = 0; i < array.length(); i++) {
JSONObject jsonObject = array.getJSONObject(i);
String name = jsonObject.getString("name");
String desc = jsonObject.getString("desc");
String imagepath = jsonObject.getString("imagepath");
RuanJian ruanJian = new RuanJian(name, desc, imagepath);
SQLinsert(ruanJian);
ruanjian.add(ruanJian);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
runOnUiThread(new Runnable() {
public void run() {
myAdaper.notifyDataSetChanged();
}
}); return null;
}
private void SQldelete() {
mdb.delete("student", null, null);
}
private void SQLinsert(RuanJian ruanjian) {
ContentValues values = new ContentValues();
values.put("name", ruanjian.name);
values.put("desc", ruanjian.desc);
values.put("imagepath", ruanjian.imagepath);
mdb.insert("student", null, values);
}
}
class MyAsyncTask2 extends AsyncTask<String, Void, Bitmap> {
private ImageView imageview;
int position;
String name;
public MyAsyncTask2(ImageView imageview,int position,String name) {
this.imageview = imageview;
this.position = position;
this.name = name;
}
@Override
protected Bitmap doInBackground(String... params) {
Cursor cursor = mdb.query("student", null, "name = ?",new String[]{name}, null, null, null);
if (cursor.moveToFirst()) {
String image_path = cursor.getString(cursor.getColumnIndex("imagepath"));
File file = new File(image_path);
try {
FileInputStream is = new FileInputStream(file);
Bitmap bitmap = BitmapFactory.decodeStream(is);
hashBit.put(params[0], bitmap);
return bitmap;
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
Bitmap bitmap = null;
try {
URL url = new URL(params[0]);
URLConnection openConnection = url.openConnection();
openConnection.setConnectTimeout(3000);
openConnection.setReadTimeout(3000);
InputStream is = openConnection.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
hashBit.put(params[0], bitmap);
//实现把图片保存到sdcard中
//判断sdcard是否可用
//得到保存图片的上一级目录,file.getparentFile
//bitmap.compress
int image_index = params[0].lastIndexOf("/");
String image_path = params[0].substring(image_index);
if (bitmap!=null) {
if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
String path = Environment.getExternalStorageDirectory().getPath() + "/images/"+image_path;
update(path,name);
File file = new File(path);
File file2 = file.getParentFile();
if(!file2.exists())
{
file2.mkdirs();
}
FileOutputStream fos = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
}
}
} catch (MalformedURLException e) {
runOnUiThread(new Runnable() {
@Override
public void run() {
chongshi.setText("读取失败2");
}
});
e.printStackTrace();
} catch (Exception e) {
runOnUiThread(new Runnable() {
@Override
public void run() {
chongshi.setText("网络连接异常2");
}
});
e.printStackTrace();
}
return bitmap;
}
private void update(String path,String name) {
Log.e("========name========", name+","+path);
ContentValues values = new ContentValues();
values.put("imagepath", path);
mdb.update("student", values , "name =?", new String[]{name});
}
@Override
protected void onPostExecute(Bitmap result) {
if (listview.getFirstVisiblePosition()<=position &&listview.getLastVisiblePosition()>=position)
{
imageview.setImageBitmap(result);
}
progressbar.setVisibility(ProgressBar.GONE);
chongshi.setVisibility(EditText.GONE);
super.onPostExecute(result);
}
}
class MyAdaper extends BaseAdapter {
@Override
public int getCount() {
// TODO Auto-generated method stub
return ruanjian.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
RuanJian ruanJian2 = ruanjian.get(position);
LayoutInflater layoutInflater = getLayoutInflater();
View inflate = null;
User user = new User();
if (convertView==null) {
inflate = layoutInflater.inflate(R.layout.itemp, null);
user.imageview = (ImageView) inflate.findViewById(R.id.imageView1);
user.et1 = (EditText) inflate.findViewById(R.id.editText1);
user.et2 = (EditText) inflate.findViewById(R.id.editText2);
inflate.setTag(user);
}else
{
inflate = convertView;
user = (User)inflate.getTag();
}
user.et1.setText(ruanJian2.name);
user.et2.setText(ruanJian2.desc);
user.imageview.setImageResource(R.drawable.ic_launcher);
Bitmap bitmap = hashBit.get(ruanJian2.imagepath);
if (bitmap == null) {
MyAsyncTask2 task2 = myasync.get(ruanJian2.imagepath);
if(task2==null)
{
task2 = new MyAsyncTask2(user.imageview,position,ruanJian2.name);
myasync.put(ruanJian2.imagepath, task2);
task2.execute(ruanJian2.imagepath);
}
}else
{
user.imageview.setImageBitmap(bitmap);
}
return inflate;
}
}
class User
{
ImageView imageview;
EditText et1;
EditText et2;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button1:
btn_01();
break;
default:
break;
}
}
private void btn_01() {
download();
button.setVisibility(Button.INVISIBLE);
progressbar.setVisibility(ProgressBar.VISIBLE);
chongshi.setText("正在加载");
}
}
JSON_SQLite_Listview 06-17,布布扣,bubuko.com
原文：http://8988940.blog.51cto.com/8978940/1431668