android ListView局部刷新和模拟应用下载 ListView 进度条下载 ListView多个下载

最新推荐文章于 2016-06-01 22:25:05 发布

menglele1314

最新推荐文章于 2016-06-01 22:25:05 发布

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分类专栏： android ListView 文章标签： ListView item下载 ListView 进度条下载 ListView的局部刷新 ListView局部刷新和模拟应用下载 Adapter实现ListView动态刷

本文链接：https://blog.youkuaiyun.com/menglele1314/article/details/50883869

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本文介绍如何在Android中实现ListView的局部刷新，同时结合实例展示了ListView中的进度条下载功能，支持多个文件下载操作。提供了一个Demo下载链接供参考。

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android ListView局部刷新和模拟应用下载 ListView 进度条下载 ListView多个下载

Demo下载 http://download.youkuaiyun.com/detail/menglele1314/9460510

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#FFFFFF"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/listview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:cacheColorHint="@android:color/transparent"
        android:divider="@android:color/darker_gray"
        android:dividerHeight="1dp"
        android:listSelector="@android:color/transparent" />

</LinearLayout>

ListViewActivity.java

package com.download.demo.listview;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.widget.ProgressBar;

import com.download.demo.R;
import com.download.demo.listview.TestListAdapter.MyClickListener;
import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.HttpHandler;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;

public class ListViewActivity extends Activity {
	private List<Bean> strList = new ArrayList<Bean>();
	private ListView listView;
	private TestListAdapter ListAdapter;
	private HttpHandler<File> sHandler = null;
	private HttpUtils http = null;

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

		for (int i = 0; i < 20; i++) {
			strList.add(new Bean("testDemo" + i, true, 0));
		}

		listView = (ListView) findViewById(R.id.listview);
		ListAdapter = new TestListAdapter(this, strList, mListener);
		listView.setAdapter(ListAdapter);
	}

	int i = 0;
	/**
	 * 实现类，响应按钮点击事件
	 */
	private MyClickListener mListener = new MyClickListener() {
		@Override
		public void myOnClick(int position, View v) {
			download(position);
		}
	};

	@Override
	protected void onDestroy() {
		if (null != sHandler) {
			sHandler.cancel();
		}
		super.onDestroy();
	}

	public void download(final int position) {

		strList.get(position).setDownload(true);
		String path = this.getFilesDir().getAbsolutePath();
		File file = new File(path, strList.get(position).getName());
		if (file.exists()) {
			file.delete();
		}
		http = new HttpUtils();
		String url = "http://220.194.224.12/dd.myapp.com/16891/526EB7BDA5A8F4A4640E49B51F66D0B4.apk?mkey=56de6f924af9d42f&f=2484&fsname=com.zcycjy.mobile_1.0.5_5.apk&p=.apk";
		sHandler = http.download(url, file.getPath().toString(), true, // 如果目标文件存在，接着未完成的部分继续下载。服务器不支持RANGE时将从新下载。
				true, // 如果从请求返回信息中获取到文件名，下载完成后自动重命名。
				new RequestCallBack<File>() {

					@Override
					public void onStart() {
					}

					@Override
					public void onLoading(long total, long current,
							boolean isUploading) {
						double i = current / (double) total * 100;
						int progress = (int) Math.ceil(i);
						// mTasks.get(positionInAdapter).setDownload(true);
						strList.get(position).setProgress(progress);

						if (position >= listView.getFirstVisiblePosition()
								&& position <= listView
										.getLastVisiblePosition()) {
							int positionInListView = position
									- listView.getFirstVisiblePosition();
							ProgressBar item = (ProgressBar) listView
									.getChildAt(positionInListView)
									.findViewById(R.id.download_pb);
							item.setProgress(progress);
						}
					}

					@Override
					public void onFailure(HttpException arg0, String arg1) {
					}

					@Override
					public void onSuccess(ResponseInfo<File> responseInfo) {
					}
				});
	}

}

剩下的没代码你可以下载Demo看看

Demo下载