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API 29でDownloadManagerを使用してファイルをダウンロードする方法またはAndroid Q？

Android開発の初心者なので、DownloadManagerを使用して簡単なアプリを作ろうとしています。

これがコードです

public class MainActivity extends AppCompatActivity implements ActivityCompat.OnRequestPermissionsResultCallback{

Button btn;

private long referenceID;
private DownloadManager downloadManager;
private static final int PERMISSION_REQUEST_CODE = 1;

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

    btn = findViewById(R.id.btn);

    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {



            if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){


                if (checkPermission())
                {

                    /*** If Storage Permission Is Given, Check External storage is available for read and write***/

                    Uri image_uri = Uri.parse("https://unifiedclothes.com/Unifiedclothes/App_Gallery/thumb_8_121432471036-1432471036-SC-505.jpg");

                    referenceID = DownloadImage(image_uri);




                } else {

                    requestPermission();
                }

            }

            else{
                Toast.makeText(MainActivity.this,"Permission Is Granted..",Toast.LENGTH_SHORT).show();

            }
        }
    });

    registerReceiver(receiver,new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}

private BroadcastReceiver receiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {

        String action = intent.getAction();

        if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)){



            DownloadManager.Query ImageDownloadQuery = new DownloadManager.Query();
            //set the query filter to our previously Enqueued download
            ImageDownloadQuery.setFilterById(referenceID);

            //Query the download manager about downloads that have been requested.
            Cursor cursor = downloadManager.query(ImageDownloadQuery);

            if(cursor.moveToFirst()){

                Toast.makeText(MainActivity.this,DownloadStatus(cursor),Toast.LENGTH_SHORT).show();
            }



        }

    }
};

private String DownloadStatus(Cursor cursor){

    //column for download  status
    int columnIndex = cursor.getColumnIndex(DownloadManager.COLUMN_STATUS);
    int status = cursor.getInt(columnIndex);
    //column for reason code if the download failed or paused
    int columnReason = cursor.getColumnIndex(DownloadManager.COLUMN_REASON);
    int reason = cursor.getInt(columnReason);



    String statusText = "";
    String reasonText = "";

    switch(status){
        case DownloadManager.STATUS_FAILED:
            statusText = "STATUS_FAILED";
            switch(reason){
                case DownloadManager.ERROR_CANNOT_RESUME:
                    reasonText = "ERROR_CANNOT_RESUME";
                    break;
                case DownloadManager.ERROR_DEVICE_NOT_FOUND:
                    reasonText = "ERROR_DEVICE_NOT_FOUND";
                    break;
                case DownloadManager.ERROR_FILE_ALREADY_EXISTS:
                    reasonText = "ERROR_FILE_ALREADY_EXISTS";
                    break;
                case DownloadManager.ERROR_FILE_ERROR:
                    reasonText = "ERROR_FILE_ERROR";
                    break;
                case DownloadManager.ERROR_HTTP_DATA_ERROR:
                    reasonText = "ERROR_HTTP_DATA_ERROR";
                    break;
                case DownloadManager.ERROR_INSUFFICIENT_SPACE:
                    reasonText = "ERROR_INSUFFICIENT_SPACE";
                    break;
                case DownloadManager.ERROR_TOO_MANY_REDIRECTS:
                    reasonText = "ERROR_TOO_MANY_REDIRECTS";
                    break;
                case DownloadManager.ERROR_UNHANDLED_HTTP_CODE:
                    reasonText = "ERROR_UNHANDLED_HTTP_CODE";
                    break;
                case DownloadManager.ERROR_UNKNOWN:
                    reasonText = "ERROR_UNKNOWN";
                    break;
            }
            break;
        case DownloadManager.STATUS_PAUSED:
            statusText = "STATUS_PAUSED";
            switch(reason){
                case DownloadManager.PAUSED_QUEUED_FOR_WIFI:
                    reasonText = "PAUSED_QUEUED_FOR_WIFI";
                    break;
                case DownloadManager.PAUSED_UNKNOWN:
                    reasonText = "PAUSED_UNKNOWN";
                    break;
                case DownloadManager.PAUSED_WAITING_FOR_NETWORK:
                    reasonText = "PAUSED_WAITING_FOR_NETWORK";
                    break;
                case DownloadManager.PAUSED_WAITING_TO_RETRY:
                    reasonText = "PAUSED_WAITING_TO_RETRY";
                    break;
            }
            break;
        case DownloadManager.STATUS_PENDING:
            statusText = "STATUS_PENDING";
            break;
        case DownloadManager.STATUS_SUCCESSFUL:
            statusText = "Image Saved Successfully";
            //reasonText = "Filename:\n" + filename;
            Toast.makeText(MainActivity.this, "Download Status:" + "\n" + statusText + "\n" + reasonText, Toast.LENGTH_SHORT).show();
            break;
    }

    return statusText + reasonText;


}


private long DownloadImage(Uri uri){

    long downloadReference;

    downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);

    DownloadManager.Request request = new DownloadManager.Request(uri);
    //Setting title of request
    request.setTitle("Image Download");

    //Setting description of request
    request.setDescription("Image download using DownloadManager.");


    request.setDestinationInExternalPublicDir(getExternalFilesDir(Environment.DIRECTORY_PICTURES) + "/NewFile","sample2.jpg");
    //request.allowScanningByMediaScanner();
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
    downloadReference = downloadManager.enqueue(request);


    return  downloadReference;
}


private boolean checkPermission() {
    int result = ContextCompat.checkSelfPermission(MainActivity.this, Android.Manifest.permission.WRITE_EXTERNAL_STORAGE);
    if (result == PackageManager.PERMISSION_GRANTED) {
        return true;
    } else {
        return false;
    }
}


private void requestPermission() {

    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE);
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    if (requestCode == PERMISSION_REQUEST_CODE) {

        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

            Uri image_uri = Uri.parse("https://www.dccomics.com/sites/default/files/Char_GetToKnow_Batman80_5ca54cb83a27a6.53173051.png");

            referenceID = DownloadImage(image_uri);


        }

        else {

            Toast.makeText(MainActivity.this, "Permission Denied... \n You Should Allow External Storage Permission To Download Images.", Toast.LENGTH_LONG).show();
        }
    }
}

}

API 29以下のデバイスで実行するとうまく動作します（テストデバイスはNexus 5X、ApI 28エミュレーターでした）。しかし、Nexus 5Xで実行すると、API 29アプリがクラッシュします。ここにログがあります：

2019-09-24 20:51:46.354 11322-11344/? E/DatabaseUtils: Writing exception to parcel
Java.lang.IllegalStateException: Not one of standard directories: /storage/emulated/0/Android/data/com.blz.prisoner.downloadmanager/files/Pictures/NewFile
    at com.Android.providers.downloads.DownloadProvider.call(DownloadProvider.Java:651)
    at Android.content.ContentProvider.call(ContentProvider.Java:2152)
    at Android.content.ContentProvider$Transport.call(ContentProvider.Java:477)
    at Android.content.ContentProviderNative.onTransact(ContentProviderNative.Java:277)
    at Android.os.Binder.execTransactInternal(Binder.Java:1021)
    at Android.os.Binder.execTransact(Binder.Java:994)

2019-09-24 20：51：46.355 15023-15023/com.blz.prisoner.downloadmanager D/AndroidRuntime：VMをシャットダウンしています

--------- beginning of crash
2019-09-24 20:51:46.360 15023-15023/com.blz.prisoner.downloadmanager E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.blz.prisoner.downloadmanager, PID: 15023
    Java.lang.IllegalStateException: Not one of standard directories: /storage/emulated/0/Android/data/com.blz.prisoner.downloadmanager/files/Pictures/NewFile
        at Android.os.Parcel.createException(Parcel.Java:2079)
        at Android.os.Parcel.readException(Parcel.Java:2039)
        at Android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.Java:188)
        at Android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.Java:140)
        at Android.content.ContentProviderProxy.call(ContentProviderNative.Java:658)
        at Android.content.ContentProviderClient.call(ContentProviderClient.Java:558)
        at Android.content.ContentProviderClient.call(ContentProviderClient.Java:546)
        at Android.app.DownloadManager$Request.setDestinationInExternalPublicDir(DownloadManager.Java:567)
        at com.blz.prisoner.downloadmanager.MainActivity.DownloadImage(MainActivity.Java:206)
        at com.blz.prisoner.downloadmanager.MainActivity.access$200(MainActivity.Java:29)
        at com.blz.prisoner.downloadmanager.MainActivity$1.onClick(MainActivity.Java:60)
        at Android.view.View.performClick(View.Java:7140)
        at Android.view.View.performClickInternal(View.Java:7117)
        at Android.view.View.access$3500(View.Java:801)
        at Android.view.View$PerformClick.run(View.Java:27351)
        at Android.os.Handler.handleCallback(Handler.Java:883)
        at Android.os.Handler.dispatchMessage(Handler.Java:100)
        at Android.os.Looper.loop(Looper.Java:214)
        at Android.app.ActivityThread.main(ActivityThread.Java:7356)
        at Java.lang.reflect.Method.invoke(Native Method)
        at com.Android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.Java:492)
        at com.Android.internal.os.ZygoteInit.main(ZygoteInit.Java:930)

私は問題が行にあると思いますrequest.setDestinationInExternalPublicDir（getExternalFilesDir（Environment.DIRECTORY_PICTURES）+ "/NewFile","sample2.jpg");" in DownloadImage（Uri uri）関数。問題を解決する方法??

もう1つの問題は、API 29の下のデバイスでアプリを実行するとうまく機能するが、ダウンロードの完了後に通知をクリックしても、ギャラリー/保存されているフォルダーの画像が開かないことです。

androidandroid-download-manager
7
Bishal Imtiaz

compileSdkVersionおよびtargetSdkVersionを29から28に変更すると、問題が解決しました。

0
Hadi Ahmadi

私は単に使用して解決しました：

setDestinationInExternalFilesDir(context, relativePath, filename);

の代わりに：

setDestinationInExternalPublicDir(relativePath, filename);

私の相対パスは：

Environment.getExternalStorageDirectory().getPath() + "MyExternalStorageAppPath"

私は私のマニフェストにもあります：

Android:requestLegacyExternalStorage="true"

Android 10以上で使用される新しいストレージ管理（スコープストレージ）ではなく、レガシーストレージ管理（共有ストレージ）を使用するには.

0
Z3R0