【开源】Groundy

Groundy

• 项目地址： https://github.com/casidiablo/groundy

  介绍：

  异步下载文件库，使用service开启线程下载并在界面中使用progressbar显示下载进度。其实GB之后DownloadManager已经很完善的实现了下载功能，但我觉得掌握类似于Groundy 这样的库还是有它的用武之处的。

  运行效果：

  

  使用说明：

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  public class MainActivity extends Activity {     private ProgressDialog mProgressDialog;     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         findViewById(R.id.btn_download).setOnClickListener(new View.OnClickListener() {             public void onClick(View view) {                 String url = ((EditText) findViewById(R.id.edit_url)).getText().toString().trim();                 Bundle extras = new Bundler().add(DownloadTask.PARAM_URL, url).build();                 Groundy.create(DownloadExample.this, DownloadTask.class)                         .receiver(mReceiver)                         .params(extras)                         .queue();                 mProgressDialog = new ProgressDialog(MainActivity.this);                 mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);                 mProgressDialog.setCancelable(false);                 mProgressDialog.show();             }         });     }     private ResultReceiver mReceiver = new ResultReceiver(new Handler()) {         @Override         protected void onReceiveResult(int resultCode, Bundle resultData) {             super.onReceiveResult(resultCode, resultData);             switch (resultCode) {                 case Groundy.STATUS_PROGRESS:                     mProgressDialog.setProgress(resultData.getInt(Groundy.KEY_PROGRESS));                     break;                 case Groundy.STATUS_FINISHED:                     Toast.makeText(DownloadExample.this, R.string.file_downloaded, Toast.LENGTH_LONG);                     mProgressDialog.dismiss();                     break;                 case Groundy.STATUS_ERROR:                     Toast.makeText(DownloadExample.this, resultData.getString(Groundy.KEY_ERROR), Toast.LENGTH_LONG).show();                     mProgressDialog.dismiss();                     break;             }         }     }; }

  其中GroundyTask的定义如下：

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  public class DownloadTask extends GroundyTask {     public static final String PARAM_URL = "com.groundy.sample.param.url";     @Override     protected boolean doInBackground() {         try {             String url = getParameters().getString(PARAM_URL);             File dest = new File(getContext().getFilesDir(), new File(url).getName());             DownloadUtils.downloadFile(getContext(), url, dest, DownloadUtils.getDownloadListenerForTask(this));             return true;         } catch (Exception pokemon) {             return false;         }     } }