使用DownloadManager和DownloadManager打印成功下載。查詢

Question

我想打印成功下載的文件列表，其中列出了下載程序。程序列出3個成功下載的文件。下面的代碼不起作用。代碼已經在模擬器中運行。

package com.talespinkit.downloadinfodeleter; 

import android.app.DownloadManager; 
import android.app.DownloadManager.Query; 
import android.database.Cursor; 
import android.os.Bundle; 
import android.app.Activity; 
import android.util.Log; 
import android.view.Menu; 

public class MainActivity extends Activity { 
    private static final String TAG = "MainActivity"; 
    private DownloadManager downloadManager; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE); 
    } 

    @Override 
    protected void onResume() { 
     super.onResume(); 
     Query q = new Query(); 
     q.setFilterByStatus(DownloadManager.STATUS_SUCCESSFUL); 
     Cursor cursor = downloadManager.query(q); 
     Log.d(TAG, String.valueOf(cursor.getCount())); // prints 0 
     for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) { // Does not enters this loop 
      Log.d(TAG, String.valueOf(cursor.getColumnCount())); 
     } 
    } 
    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 
} 

Answer 1

從SD卡下載的文件名中使用下列優惠：

文件的SD卡= Environment.getExternalStorageDirectory（）;

String sdCardPath = sdCard.getAbsolutePath（）;

File fileDir = new File（sdCard.getAbsolutePath（） +「your file name」）;