Androidstudio视频播放

package com.abc.mm.myclassproj9_2; import android.Manifest; import android.content.ContentResolver; import android.content.pm.PackageManager; import android.database.Cursor; import android.net.Uri; import android.provider.MediaStore; import android.support.annotation.NonNull; import android.support.v4.app.ActivityCompat; import android.support.v4.content.ContextCompat; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.TextView; import android.widget.Toast; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { private ContentResolver contentResolver; private List<Video> mylist; private Uri uri; private TextView txtTitle,txtPath; @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); if (requestCode == 1) { if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { initList(); } else { Toast.makeText(this,"用户拒绝",Toast.LENGTH_SHORT).show(); } } } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); txtPath = (TextView) findViewById(R.id.textView2); txtTitle = (TextView) findViewById(R.id.textView); uri= MediaStore.Video.Media.EXTERNAL_CONTENT_URI; contentResolver=getContentResolver(); mylist = new ArrayList<>(); if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1); } else { initList(); } } private void initList() { String[] projection=new String[]{MediaStore.Video.Media.TITLE,MediaStore.Video.Media.DATA}; Cursor cursor=contentResolver.query(uri,projection,null,null,null); while (cursor.moveToNext()) { Video video=new Video(); String path = cursor.getString(1); String name=cursor.getString(0); video.setName(name); video.setPath(path); mylist.add(video); } txtTitle.setText(mylist.get(0).getName()); txtPath.setText(mylist.get(0).getPath()); } }