java.io.FileNotFoundException:output.mp4(只读文件系统)

Question

我正在尝试将我的图像转换为视频.我找到了示例代码并用于我的应用程序.但我得到的错误就像

java.io.FileNotFoundException: output.mp4 (Read-only file system)

这是我的代码的片段:

    public class Main2Activity extends AppCompatActivity {

        AndroidSequenceEncoder encoder;
        @RequiresApi(api = Build.VERSION_CODES.N)
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main2);

            ArrayList<Bitmap> arrayList = new ArrayList<>();
            Bitmap b = BitmapFactory.decodeResource(getResources(),R.drawable.empty_collage);
            Bitmap a = BitmapFactory.decodeResource(getResources(),R.drawable.images);

            arrayList.add(a);
            arrayList.add(b);

            File file = new File("output.mp4");

            SeekableByteChannel out = null;
            try {
                out = (SeekableByteChannel) NIOUtils.writableFileChannel(String.valueOf(file));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
                Log.e("msg",e.toString());
            }

            try {
                 encoder = new AndroidSequenceEncoder((org.jcodec.common.io.SeekableByteChannel) out, Rational.R(25,1));
            } catch (IOException e) {
                e.printStackTrace();
            }

            Toast.makeText(this, "in for loop", Toast.LENGTH_SHORT).show();
            for(int i=0 ;i<arrayList.size() ; i++){
                try {
                    encoder.encodeImage(arrayList.get(i));
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            Toast.makeText(this, "out of loop", Toast.LENGTH_SHORT).show();
            try {
                encoder.finish();
            } catch (IOException e) {
                e.printStackTrace();
            }
            NIOUtils.closeQuietly(out);
        }
     }
   }

希望我会很快得到回应.谢谢.

Answer 1

File file = new File("output.mp4");

这并不意味着任何有用的东西.始终使用方法派生要写入的根位置.

例如,您可以将其更改为:

File file = new File(getFilesDir(), "output.mp4");

要么:

File file = new File(getExternalFilesDir(null), "output.mp4");