Intent跳转传值（ImageLoader加载图片）

来源：互联网发布：安庆市网络问政编辑：程序博客网时间：2024/06/03 23:42

public class MainActivityextends AppCompatActivity {
    private ListView listview;
    private List<MenuInfo.ListBean> list;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //找到控件
        listview = (ListView) findViewById(R.id.lv);
        //调用方法
        read("http://qhb.2dyt.com/Bwei/news?page=1&type=7&postkey=ad1AK");
    }
    //定义一个有参方法
    public void read(String path){

        new AsyncTask<String, Void, String>() {
            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);
                //判断
                if (s!=null){
                    //实例化
                    Gson gson=new Gson();
                    MenuInfo menuInfo = gson.fromJson(s, MenuInfo.class);
                    //参加集合
                    list = menuInfo.getList();
                    //做适配器
                    listview.setAdapter(new myadapter());
                    //点击item跳转到下一个界面
                    listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                        @Override
                        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                            Intent intent=new Intent(MainActivity.this,SecondActivity.class);
                            intent.putExtra("image",list.get(position).getPic());
                            intent.putExtra("title",list.get(position).getTitle());
                            //跳转
                            startActivity(intent);
                        }
                    });
                }
            }
            @Override
            protected String doInBackground(String... params) {
                try {
                    //看做成一个数组
                    String path=params[0];
                    //实例化
                    URL url=new URL(path);
                    //实例化HttpURLConnection方法
                    HttpURLConnection connection= (HttpURLConnection) url.openConnection();
                    //请求方法
                    connection.setRequestMethod("GET");
                    //链接时间
                    connection.setConnectTimeout(5000);
                    //读取时间
                    connection.setReadTimeout(5000);
                    //得到响应码
                    int code = connection.getResponseCode();
                    if (code==200){
                        //得到json
                        InputStream is = connection.getInputStream();
                        String json = SteaInfo.add(is);
                        return json;
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return null;
            }
        }.execute(path);
    }
    //继承BaseAdapter
    class myadapter extends BaseAdapter{
        private DisplayImageOptions options;
//得到个数
        @Override
        public int getCount() {
            options= new DisplayImageOptions.Builder()
                    .cacheInMemory(true).cacheOnDisk(true)
                    .displayer(new RoundedBitmapDisplayer(20))
                    .build();
            return list!=null?list.size():0;
        }
//得到内容
        @Override
        public Object getItem(int position) {
            return list.get(position);
        }
//得到索引
        @Override
        public long getItemId(int position) {
            return position;
        }
//重要方法
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            //判断
            if (convertView==null){
                //找到xml
                convertView=convertView.inflate(MainActivity.this,R.layout.item,null);
            }
            //找到控件
            ImageView image = (ImageView) convertView.findViewById(R.id.iv);
            TextView tv = (TextView) convertView.findViewById(R.id.tv);
            //得到标题
            tv.setText(list.get(position).getTitle());
            //添加图片
            ImageLoader.getInstance().displayImage(list.get(position).getPic(),image,options);
            return convertView;
        }

}

public class SecondActivity extends AppCompatActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);
        //找到控件
        final ImageView im = (ImageView) findViewById(R.id.im);
        TextView tv = (TextView) findViewById(R.id.tev);
        Intent intent = getIntent();
        final String image = intent.getStringExtra("image");
        String title = intent.getStringExtra("title");
        tv.setText(title);
        ImageLoaderConfiguration configuration=new ImageLoaderConfiguration.Builder(this)
                .build();
        ImageLoader.getInstance().init(configuration);
        ImageLoader.getInstance().loadImage(image, new ImageLoadingListener() {
            @Override
            public void onLoadingStarted(String imageUri, View view) {
            }
            @Override
            public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
                //失败设置系统图片
                im.setImageResource(R.mipmap.ic_launcher);
            }
            @Override
            public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
                //成功调用图片转换把图片变为圆形

                //把图片设置上去
                im.setImageBitmap(loadedImage);
            }
            @Override
            public void onLoadingCancelled(String imageUri, View view) {
            }
        });
    }

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