Afinal加载网络图片及下载文件使用方法
来源：互联网 发布：可用的数据接口 编辑：程序博客网 时间：2024/05/29 04:37
Afinal快速开发框架使用起来非常方便，下面将讲解如何利用Afinal加载网络图片及下载文件：
先看效果图：
注意：使用Afinal前需添加Afinal的jar,可以在这里下载：http://download.csdn.net/detail/baiyuliang2013/7313587
其中包括了Afinal的源码和jar，使用时只需添加jar包即可，在学习阶段也可以直接添加源码到你的项目中，可以更深入的学习Afinal。
看代码：
activit_main.xml:
- <RelativeLayout 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"
- tools:context=".MainActivity" >
-
- <Button
- android:id="@+id/btn"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="下载" />
-
- <TextView
- android:id="@+id/text"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_toRightOf="@+id/btn"
- android:text="进度：" />
-
- <ImageView
- android:id="@+id/img"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_centerInParent="true"
- android:layout_centerHorizontal="true"
- android:src="@drawable/ic_launcher"
- />
-
- </RelativeLayout>
- package com.example.afinaltest;
-
- import java.io.File;
-
- import net.tsz.afinal.*;
- import net.tsz.afinal.annotation.view.ViewInject;
- import net.tsz.afinal.http.AjaxCallBack;
- import android.annotation.SuppressLint;
- import android.os.Bundle;
- import android.os.Environment;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.widget.Button;
- import android.widget.ImageView;
- import android.widget.TextView;
- import android.widget.Toast;
-
- public class MainActivity extends FinalActivity {
-
- @ViewInject(id=R.id.img) ImageView img;
- TextView textView;
- Button btn;
- FinalBitmap finalBitMap=null;
- FinalHttp fh;
-
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
-
- textView=(TextView) findViewById(R.id.text);
- btn=(Button) findViewById(R.id.btn);
- btn.setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View arg0) {
- String apkPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/qq.apk";
- File f = new File(apkPath);
- if (f.exists()) {
- f.delete();
- }
- fh=new FinalHttp();
- fh.download("http://gdown.baidu.com/data/wisegame/4ae6d2d7378e6cdf/QQ_122.apk",apkPath,
- new AjaxCallBack<File>() {
- @Override
- public void onStart() {
- super.onStart();
- Toast.makeText(getApplicationContext(), "开始下载", Toast.LENGTH_SHORT).show();
- }
- @SuppressLint("DefaultLocale")
- @Override
- public void onLoading(long count, long current) {
- super.onLoading(count, current);
- int progress=0;
- if (current != count && current != 0) {
- progress = (int) (current / (float) count * 100);
- } else {
- progress = 100;
- }
- textView.setText("进度："+progress+"%");
- }
- @Override
- public void onSuccess(File t) {
- super.onSuccess(t);
- Toast.makeText(getApplicationContext(), "下载完成", Toast.LENGTH_SHORT).show();
- textView.setText(t==null?"null":t.getAbsoluteFile().toString());
- }
- @Override
- public void onFailure(Throwable t, int errorNo,String strMsg) {
- super.onFailure(t, errorNo, strMsg);
- Toast.makeText(getApplicationContext(), "下载失败", Toast.LENGTH_SHORT).show();
- }
- });
- }
- });
-
- finalBitMap=FinalBitmap.create(MainActivity.this);
-
- finalBitMap.display(img, "http://meme.zenfs.com/u/a33312d2e9eaa443321f4ec716fe795a23c27c89.jpeg");
-
- }
-
-
- }
分析FinallyBitmap源码可知：初始化时需调用create方法，然后再调用display(imgView,url);即可加载网络图片，也可以设置在加载完成前显示的图片等等，这个看下源代码便知，下载文件需用FinalHttp，并调用download方法，该例中使用download(String,String,AjaxCallBack<File>);方法，第一个参数是将要下载的文件路径，第二个参数为本地文件保存路径，第三个是一个回调函数，每隔一秒会调用一次，可以方便的查看文件下载进度以及文件下载情况如成功失败，下载完成等，需重写onStart,onLoading,onSuccess,onFailure等方法。
最后不要忘了在AndroidManifest.xml中添加网络访问权限和存储卡读取及写入权限：
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
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