错误需要'Android.permission.read_external_storage'或grantUriPermission()[duplicate]

Question

这是我的logcat：

java.lang.runtimeException：无法启动活动ComponentInfo{com.example.murarilal.listview/com.example.murarilal.listview.mainactivity}:java.lang.securityException：权限拒绝：读取com.android.providers.media.mediaProvider uri内容：//media/external/audio/media from pid=12518，uid=10087需要Android.Permission.read_external_storage或.app.activityThread.-Wrap12(activityThread.java)，android.app.activityThread$h.handleMessage(activityThread.java:1460)，android.os.handler.dispatchMessage(handler.java:102)，android.os.handler.dispatchMessage(handler.java:154)，android.os.looper.loop(handler.java:154)，android.app.activityThread.main伊戈泰伊尼特.main（zygoteinit.java:756)由：java.lang.securityexception：权限拒绝：reading com.android.providers.media.media.provider uri content://media/external/audio/media from pid=12518,uid=10087需要Android.Permission.read_external_storage或grantUriPermission（）在xy.query（contentProviderNative.java:421)在Android.content.contentResolver.query（contentResolver.java:530)在Android.content.contentResolver.query（contentResolver.java:472)在com.example.murarilal.listview.mainActivity.getMusic（mainActivity.java:57)在com.example.murarilal.listview.mainActivity.dostuff（mainActivity.java:77)在Android.app.instrumentation.callactivityoncreate（instrumentation.java:1118)在Android.app.activitythread.performLaunchActivity（activitythread.java:2599)在Android.app.activitythread.handleLaunchActivity（activitythread.java:2707) 在Android.app.activitythread.-Wrap12(activitythread.java) 在Android.app.activitythread$h.handleMessage(activitythread.java:1460) 在Android.os.handler.DispatchMessage(Handler.java:102) 在Android.os.looper.loop(looper.java:154) 在Android.app.activitythread.main（activitythread.java:6077) 在java.lang.reflect.Method.invoke（本机方法） 在com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:866) 在com.android.internal.os.zygoteinit.main(zygoteinit.java:756)

注意：我正在从SDCard读取文件。我认为错误是在getMusic（）函数中游标。请帮我做这个。

MainActivity代码

public class MainActivity extends AppCompatActivity {

    private static final int MY_PERMISSION_REQUEST = 1;
    ArrayList<String> arrayList;
    ListView listView;
    ArrayAdapter<String> adapter;

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


        if (ContextCompat.checkSelfPermission(MainActivity.this,
                Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_DENIED) {
            if (ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE)) {
                ActivityCompat.requestPermissions(MainActivity.this,
                        new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, MY_PERMISSION_REQUEST);

            } else {
                ActivityCompat.requestPermissions(MainActivity.this,
                        new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, MY_PERMISSION_REQUEST);

            }
        } else {
            doStuff();
        }

    }

    public void getMusic()
    {
        ContentResolver contentResolver=getContentResolver();
        Uri songUri =MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
        Cursor songCursor=contentResolver.query(songUri,null,null,null,null);
        {
            if(songCursor!=null && songCursor.moveToFirst())
            {
                int songTitle=songCursor.getColumnIndex(MediaStore.Audio.Media.TITLE);
                int songArtist=songCursor.getColumnIndex(MediaStore.Audio.Media.ARTIST);
                do{
                    String currentTitle=songCursor.getString(songTitle);
                    String currentArtist=songCursor.getString(songArtist);
                    arrayList.add(currentTitle +"\n"+currentArtist);

                }while (songCursor.moveToFirst());

            }
        }
    }

    public void doStuff() {
        listView = (ListView) findViewById(R.id.listView);
        arrayList = new ArrayList<>();
        getMusic();
        adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1,arrayList);
        listView.setAdapter(adapter);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

            }
        });


    }



    @Override
    public void onRequestPermissionsResult ( int requestCode, String[] permissions,int[] grantResults){
        switch (requestCode) {
            case MY_PERMISSION_REQUEST:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    {
                        if (ContextCompat.checkSelfPermission(MainActivity.this,
                                Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_DENIED) {
                            Toast.makeText(this, "permission granted", Toast.LENGTH_LONG).show();
                            doStuff();
                        } else {
                            Toast.makeText(this, "no permission granted", Toast.LENGTH_LONG).show();
                            finish();
                        }

                    }
                    return;
                }
        }
    }



}

任何帮助都将不胜感激，谢谢。

Answer 1

你的问题是：

您正在检查权限是否被拒绝而不是请求权限，是否被拒绝而不是dostufle()，这与您想要做的完全相反。

您应该检查它是否被授予请求权限，以及是否被授予dostuff（）

如果条件为：

if (ContextCompat.checkSelfPermission(MainActivity.this,
                    Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_DENIED)

if (ContextCompat.checkSelfPermission(MainActivity.this,
                        Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)