Question

我的应用：拍照并将它们存放在外部存储器的文件夹中。当我从应用程序外部进入文件夹时，我发现这些照片已经注册，但当我从应用程序进入该文件夹时，没有显示任何内容。

CameraActivity.java：

public class CameraActivity extends Activity {

    Button button ;
    ImageView imageView ;
    Button button2 ;
    static final int CAM_REQUEST = 1 ;
    File[] f ;
    int cpt;
    File folder = new File("/sdcard/Camera_app");

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_camera);
        button = (Button) findViewById(R.id.CameraButton);
        imageView = (ImageView) findViewById(R.id.imageView);
        button2 = (Button) findViewById(R.id.dossier);
        f = folder.listFiles();
        try {cpt = f.length ;} catch (NullPointerException e){cpt=1;}

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent Camera_intenet = new 
                 Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                File file = getFile();
                Camera_intenet.putExtra(MediaStore.EXTRA_OUTPUT, 
                Uri.fromFile(file));
                startActivityForResult(Camera_intenet, CAM_REQUEST);}
               });
         button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent acces_intent = new Intent(Intent.ACTION_PICK);
                File pictures =       Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
                String[] listOfPictures = pictures.list();
                Uri uri = null ;
                ArrayList<Uri> arrayList = new ArrayList<>();
                for (String picture : listOfPictures)
                {
                 uri = Uri.parse("file://"+pictures.toString()+"/"+picture);
                    arrayList.add(uri);}
                        acces_intent.setType("image/*");
                    acces_intent.putExtra(acces_intent.EXTRA_STREAM, arrayList);
                startActivityForResult(acces_intent, 1);
            }
        });}

    private File getFile()
    {
        if(!folder.exists())
        {folder.mkdir();}
        File image_file = new File(folder,"Cam_image"+cpt+".jpg");
        return image_file ;
         }
        @Override
       protected void onActivityResult(int requestCode, int resultCode, Intent       data)    {
        String path = "/sdcard/Camera_app/Cam_image"+cpt+".jpg";
        cpt++;

        imageView.setImageDrawable(Drawable.createFromPath(path));

Answer 1

您是否已将权限<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>添加到AndroidManifest？

错误E / BitmapFactory：无法解码流：java.io.FileNotFoundException :: open failed：ENOENT（没有这样的文件或目录）

1 个答案: