Image-loader之sd卡的写入

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="likaihu.com.baway.monthexam_a.MainActivity">


    <RadioGroup
        android:id="@+id/RG"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <RadioButton
            android:id="@+id/rb_Introduce"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:button="@null"
            android:gravity="center"
            android:padding="5dp"
            android:text="本社介绍"
            android:textSize="20sp"

            />

        <RadioButton
            android:id="@+id/rb_ZhiNeng"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:button="@null"
            android:gravity="center"
            android:padding="5dp"
            android:text="履行职能"
            android:textSize="20sp"

            />

        <RadioButton
            android:id="@+id/rb_JianShe"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:button="@null"
            android:gravity="center"
            android:padding="5dp"
            android:text="自身建设"
            android:textSize="20sp"

            />

    </RadioGroup>


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <View
            android:id="@+id/view_Introduce"
            android:layout_width="100dp"
            android:layout_height="5dp"
            android:layout_gravity="center_horizontal"
            android:layout_weight="1"
            android:background="#E36257"
            android:visibility="invisible"

            ></View>

        <View
            android:id="@+id/view_ZhiNeng"
            android:layout_width="100dp"
            android:layout_height="5dp"
            android:layout_gravity="center_horizontal"
            android:layout_weight="1"
            android:background="#E36257"
            android:visibility="invisible"

            ></View>

        <View
            android:id="@+id/view_JianShe"
            android:layout_width="100dp"
            android:layout_height="5dp"
            android:layout_gravity="center_horizontal"
            android:layout_weight="1"
            android:background="#E36257"
            android:visibility="invisible"

            ></View>
    </LinearLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/vp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></android.support.v4.view.ViewPager>


</LinearLayout>


2.==========================================


public class MainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener, ViewPager.OnPageChangeListener {

    private ViewPager vp;
    private RadioGroup rg;
    private List<Fragment> fragmentList;
    private RadioButton rb_introduce;
    private RadioButton rb_zhiNeng;
    private RadioButton rb_jianShe;
    private View view_introduce;
    private View view_zhiNeng;
    private View view_jianShe;
    private MyViewPagerAdapter adapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Boolean aBoolean = NetWorkUtils.netWorkIsConnection(this);
        if (aBoolean){

            initData();
            initView();
            //设置适配器
            adapter = new MyViewPagerAdapter(getSupportFragmentManager(),fragmentList);
            vp.setAdapter(adapter);

        }else{

            Toast.makeText(this,"没有网络，请连接网路！",Toast.LENGTH_SHORT).show();
            //finish();
        }




    }

    private void initView() {

        vp = (ViewPager) findViewById(R.id.vp);
        rg = (RadioGroup) findViewById(R.id.RG);
        rb_introduce = (RadioButton) findViewById(R.id.rb_Introduce);
        rb_zhiNeng = (RadioButton) findViewById(R.id.rb_ZhiNeng);
        rb_jianShe = (RadioButton) findViewById(R.id.rb_JianShe);

        view_introduce = findViewById(R.id.view_Introduce);
        view_zhiNeng = findViewById(R.id.view_ZhiNeng);
        view_jianShe = findViewById(R.id.view_JianShe);

        rg.setOnCheckedChangeListener(this);
        vp.setOnPageChangeListener(this);
    }

    private void initData() {

        fragmentList = Arrays.asList(new FragmentIntroduce(), new FragmentZhiNeng(), new FragmentJianShe());

    }

    @Override
    public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) {
        int current = 0;
        switch (checkedId) {

            case R.id.rb_Introduce:
                view_introduce.setVisibility(View.VISIBLE);
                view_zhiNeng.setVisibility(View.INVISIBLE);
                view_jianShe.setVisibility(View.INVISIBLE);
                current = 0;
                break;
            case R.id.rb_ZhiNeng:
                view_zhiNeng.setVisibility(View.VISIBLE);
                view_jianShe.setVisibility(View.INVISIBLE);
                view_introduce.setVisibility(View.INVISIBLE);
                current = 1;
                break;
            case R.id.rb_JianShe:
                view_jianShe.setVisibility(View.VISIBLE);
                view_introduce.setVisibility(View.INVISIBLE);
                view_zhiNeng.setVisibility(View.INVISIBLE);
                current = 2;
                break;
        }

        //判断是否是同一界面，不是则跳转指定页面
        if (vp.getCurrentItem() != current) {

            //vp.setCurrentItem(current);
            vp.setCurrentItem(current, false);

        }
    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

    }

    @Override
    public void onPageSelected(int position) {
        switch (position) {
            case 0:
                view_introduce.setVisibility(View.VISIBLE);
                view_zhiNeng.setVisibility(View.INVISIBLE);
                view_jianShe.setVisibility(View.INVISIBLE);
                rb_introduce.setChecked(true);
                break;
            case 1:
                view_zhiNeng.setVisibility(View.VISIBLE);
                view_jianShe.setVisibility(View.INVISIBLE);
                view_introduce.setVisibility(View.INVISIBLE);
                rb_zhiNeng.setChecked(true);
                break;
            case 2:
                view_jianShe.setVisibility(View.VISIBLE);
                view_introduce.setVisibility(View.INVISIBLE);
                view_zhiNeng.setVisibility(View.INVISIBLE);
                rb_zhiNeng.setChecked(true);
                break;

        }
    }

    @Override
    public void onPageScrollStateChanged(int state) {

    }
}



3.=========================================





public class StreamTools {

    public static String parseStreamToString(InputStream is){

        try {
            int len =0;
            byte[] buffer=new byte[1024];
            ByteArrayOutputStream baos=new ByteArrayOutputStream();
            while((len=is.read(buffer))!=-1){
                baos.write(buffer,0,len);
            }

            return baos.toString("utf-8");
        } catch (Exception e) {
            e.printStackTrace();
        }


        return  null;
    }
}





4.========================================

public class MyApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();


        try {
            //缓存路径
            File cacheDir = StorageUtils.getOwnCacheDirectory(this, Environment.getExternalStorageDirectory().getPath());

            ImageLoaderConfiguration  configuration=new ImageLoaderConfiguration.Builder(this)
                    .threadPoolSize(3)  //配置线程数
                    .memoryCache(new LruMemoryCache(2*1024*1024))//内存缓存图片  2M
                    .diskCache(new UnlimitedDiskCache(cacheDir))//配置sdcard的缓存路径
                    .diskCacheSize(50*1024*1024)//sdcard上缓存50M 的图片
                    .diskCacheFileCount(100)//缓存数量100个
                    .diskCacheFileNameGenerator(new Md5FileNameGenerator())
                    .build();


            //配置缓存选项
            ImageLoader.getInstance().init(configuration);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}





5.=======================================



public class NetWorkUtils {

     public static  Boolean netWorkIsConnection(Context context){


     ConnectivityManager connectivityManager= (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
          NetworkInfo networkInfo=connectivityManager.getActiveNetworkInfo();
          if (networkInfo!=null){

               return  networkInfo.isAvailable();
          }
          return  false;

     }
}







6.==========================================



public class MyAdapter extends BaseAdapter {


    private Context context;
    private List<NewsInfo.DataBean> list;

    //配置图片的缓存选项
    private final DisplayImageOptions options;


    public MyAdapter(Context context, List<NewsInfo.DataBean> list) {

        this.context = context;
        this.list = list;


        options = new DisplayImageOptions.Builder().
                cacheInMemory(true)  //是否内存缓存
                .cacheOnDisk(true)//是否sdcard缓存
                .build();
    }

    @Override
    public int getCount() {
        return list != null ? list.size() : 0;
    }

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        viewHolder viewHolder = null;
        if (convertView == null) {

            convertView = convertView.inflate(context, R.layout.list_item01, null);
            viewHolder = new viewHolder();
            viewHolder.tvTitle = (TextView) convertView.findViewById(R.id.tv_title);
            viewHolder.tvContent = (TextView) convertView.findViewById(R.id.tv_content);
            viewHolder.ivZhiNeng = (ImageView) convertView.findViewById(R.id.iv_ZhiNeng);

            convertView.setTag(viewHolder);
        } else {

            viewHolder = (MyAdapter.viewHolder) convertView.getTag();
        }
        viewHolder.ivZhiNeng.setImageResource(R.mipmap.ic_launcher);
        viewHolder.tvTitle.setText(list.get(position).getTITLE());
        viewHolder.tvContent.setText(list.get(position).getSUBTITLE());


        //使用ImgeLoader加载图片,可以缓存
        ImageLoader.getInstance().displayImage((String) list.get(position).getIMAGEURL(),viewHolder.ivZhiNeng,options);



        return convertView;
    }

    static class viewHolder {
        ImageView ivZhiNeng;
        TextView tvTitle;
        TextView tvContent;

    }
}






7.==========================================



public class MyViewPagerAdapter extends FragmentPagerAdapter {


    private List<Fragment> fragmnentList;


    public MyViewPagerAdapter(FragmentManager fm, List<Fragment> fragmentList) {
        super(fm);
        this.fragmnentList=fragmentList;
    }

    @Override
    public Fragment getItem(int position) {
        return fragmnentList.get(position);
    }

    @Override
    public int getCount() {
        return fragmnentList !=null ? fragmnentList.size() :0;
    }
}







8.=========================================

/**
 * Created by TIGER LEE on 2017/4/27.
 */

public class FragmentZhiNeng extends Fragment {


    private ListView lv_zhineng;
    private NewsInfo newsInfo1;
    private MyListViewAdapter adapter;
    private Handler handler = new Handler() {


        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);

            lv_zhineng.setAdapter(adapter);
        }
    };
    private FileInputStream input;


    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.activity_zhineng, container, false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);


        lv_zhineng = (ListView) getView().findViewById(R.id.lv_zhineng);
        getInternetData("http://www.93.gov.cn/93app/data.do");


    }

    /**
     * 获取网络数据
     */
    public void getInternetData(String path) {

        new AsyncTask<String, Void, String>() {


            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);


                if (s != null) {

                    Gson gson = new Gson();
                    NewsInfo newsInfo = gson.fromJson(s, NewsInfo.class);

                    MyAdapter adapter = new MyAdapter(getContext(), newsInfo.getData());


                    lv_zhineng.setAdapter(adapter);

                }
            }

            @Override
            protected String doInBackground(String... params) {

                try {
                    String path = params[0];
                    URL url = new URL(path);
                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();

                    connection.setRequestMethod("POST");
                    connection.setConnectTimeout(5 * 1000);
                    connection.setConnectTimeout(5 * 1000);
                    OutputStream os = connection.getOutputStream();

                    os.write(("channelId=0&startNum=0").getBytes());
                    os.flush();

                    int code = connection.getResponseCode();
                    if (code == 200) {
                        InputStream is = (InputStream) connection.getContent();
                        //通过工具解析流

                        String json = StreamTools.parseStreamToString(is);

                        //把json串写到sdcard中

                        writeDataToSdcard(is,json);


                        return json;
                    }

                } catch (Exception e) {
                    e.printStackTrace();
                }


                return null;
            }
        }.execute(path);
    }


    public void writeDataToSdcard(InputStream is, String json) {
        try {
            File file = new File(Environment.getExternalStorageDirectory(), "newsinfo.txt");
            OutputStream outputStream = new FileOutputStream(file);
            if (!file.exists()) {
                file.createNewFile();

            } else {
                outputStream.write(json.getBytes());
                outputStream.flush();
                is.close();
                outputStream.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public String readDataFromSdcard() {

        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {


            File file = new File(Environment.getExternalStorageDirectory(), "newsinfo.txt");
            if (file.exists()) {
                try {
                    input = new FileInputStream(file);

                    byte[] buffer = new byte[input.available()];

                    input.read(buffer);
                    input.close();

                    return input.toString();

                } catch (Exception e) {

                    e.printStackTrace();
                }

            } else {
                Toast.makeText(getContext(), "sd 文件不存在", Toast.LENGTH_SHORT).show();
            }

        }else{

        }
        return input.toString();
    }


}