我正在为安卓开发一个mp3播放器应用,但是我遇到了与用户权限(READ_EXTERNAL_STORAGE)相关的错误。
这是我的代码,我在其中请求权限:
int permissionCheck = ContextCompat.checkSelfPermission(PlayListActivity.this,
Manifest.permission.READ_EXTERNAL_STORAGE);
if (ContextCompat.checkSelfPermission(PlayListActivity.this,
Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
// OPCIONAL(explicaciones de poque pedimos los permisos)
if (ActivityCompat.shouldShowRequestPermissionRationale(PlayListActivity.this,
Manifest.permission.READ_EXTERNAL_STORAGE)) {
} else {
//pedir permisos
ActivityCompat.requestPermissions(PlayListActivity.this,
new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
permissionCheck);
这是其余的代码:
ArrayList<HashMap<String, String>> songsListData = new ArrayList<HashMap<String, String>>();
SongsManager plm = new SongsManager(PlayListActivity.this);
// get all songs from sdcard
this.songsList = plm.getPlayList();
// looping through playlist
for (int i = 0; i < songsList.size(); i++) {
// creating new HashMap
HashMap<String, String> song = songsList.get(i);
// adding HashList to ArrayList
songsListData.add(song);
}
// se añaden las canciones a la ListView mediante un adapter utilizando el layout playlist_item
ListAdapter adapter = new SimpleAdapter(this, songsListData,
R.layout.playlist_item, new String[] { "songTitle" }, new int[] {
R.id.songTitle });
setListAdapter(adapter);
这是错误:
03-31 22:09:16.159 2258-2258/com.androidchatapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.androidchatapp, PID: 2258
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.androidchatapp/com.androidchatapp.PlayListActivity}: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=2258, uid=10184 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2434)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2494)
at android.app.ActivityThread.access$900(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1347)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5451)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=2258, uid=10184 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
at android.os.Parcel.readException(Parcel.java:1620)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:183)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135)
at android.content.ContentProviderProxy.query(ContentProviderNative.java:421)
at android.content.ContentResolver.query(ContentResolver.java:493)
at android.content.ContentResolver.query(ContentResolver.java:435)
at com.androidchatapp.SongsManager.getPlayList(SongsManager.java:48)
at com.androidchatapp.PlayListActivity.onCreate(PlayListActivity.java:65)
at android.app.Activity.performCreate(Activity.java:6323)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2494)
at android.app.ActivityThread.access$900(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1347)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5451)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)