Android xUtils3 文件下载

基于xUtils3实现单个文件，由于官方sample的文件下载实现较为复杂，所以本文简单实现了文件下载功能。

1、集成xUtils3，采用gradle方式

compile 'org.xutils:xutils:3.3.4'

2、权限

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

3、初始化，这个类要在AndroidManifest.xml文件<application/>节点下配置

public class BaseApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        x.Ext.init(this);
    }

}

4、下载实现

public class MainActivity extends AppCompatActivity {

    private static final String BASE_URL = "http://192.168.155.4:8080";
    private static final String BASE_PATH = Environment.getExternalStorageDirectory().getPath() + File.separator;
    private Button buttonDownloadFile;
    private ProgressDialog progressDialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        buttonDownloadFile = (Button) findViewById(R.id.bt_downloadFile);
        buttonDownloadFile.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String url = BASE_URL + "/code.rar";
                String path = BASE_PATH + "code.rar";
                downloadFile(url, path);
            }
        });
    }

    private void downloadFile(final String url, String path) {
        progressDialog = new ProgressDialog(this);
        RequestParams requestParams = new RequestParams(url);
        requestParams.setSaveFilePath(path);
        x.http().get(requestParams, new Callback.ProgressCallback<File>() {
            @Override
            public void onWaiting() {
            }

            @Override
            public void onStarted() {
            }

            @Override
            public void onLoading(long total, long current, boolean isDownloading) {
                progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                progressDialog.setMessage("亲，努力下载中。。。");
                progressDialog.show();
                progressDialog.setMax((int) total);
                progressDialog.setProgress((int) current);
            }

            @Override
            public void onSuccess(File result) {
                Toast.makeText(MainActivity.this, "下载成功", Toast.LENGTH_SHORT).show();
                progressDialog.dismiss();
            }

            @Override
            public void onError(Throwable ex, boolean isOnCallback) {
                ex.printStackTrace();
                Toast.makeText(MainActivity.this, "下载失败，请检查网络和SD卡", Toast.LENGTH_SHORT).show();
                progressDialog.dismiss();
            }

            @Override
            public void onCancelled(CancelledException cex) {
            }

            @Override
            public void onFinished() {
            }
        });
    }
}

5、布局文件

<?xml version="1.0" encoding="utf-8"?>
<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="com.fun.downloaduploaddemo.MainActivity">

    <Button
        android:id="@+id/bt_downloadFile"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="文件下载" />

</RelativeLayout>

6、运行截图

7、源码下载地址

源码CSDN下载