Question

我的想法是将res / raw文件夹的内容放到名为“myFolder”的外部sd文件夹中。

我的方式是我使用Uri访问res / raw中的视频文件并使用FileOutputStream并且它无法正常工作，我的方式可行吗？

*我已经具有READ和WRITE到外部sd所需的权限，并且它在清单中被放置为correclty。

代码如下，谢谢

String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
    String basepath = extStorageDirectory + "/myFolder/";
    Uri UriPath=Uri.parse
            ("android.resource://com.example.videoplayer.videoplayer/" + R.raw.video1); 
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_videoplayer);

    File videodir= new File(basepath);
    if (!videodir.exists()) {
        videodir.mkdirs();
        Toast.makeText(getApplicationContext(),
                "Directory created!", Toast.LENGTH_LONG)
                .show();
    }else{
        Toast.makeText(getApplicationContext(),
                "Directory exists!", Toast.LENGTH_LONG)
                .show();
    }
    File file = new File (basepath, "android.resource://com.example.videoplayer.videoplayer/" + R.raw.video1); //Im not sure if the code reaches the video1 file

    if (file.exists ()) file.delete ();
    try {
        FileOutputStream out = new FileOutputStream(file); //this line doesnt work
        Toast.makeText(getApplicationContext(),
                "File created!", Toast.LENGTH_LONG)
                .show();
        out.flush();
        out.close();

    } catch (Exception e) {
        e.printStackTrace();
        Toast.makeText(getApplicationContext(),
                "File error!", Toast.LENGTH_LONG)
                .show();
    }
}

Answer 1

private void copyFileOrDir(String path) {
AssetManager assetManager = this.getAssets();
String assets[] = null;
try {
    assets = assetManager.list(path);
    if (assets.length == 0) {
        copyFile(path);
    } else {
        String fullPath = "/data/data/" + this.getPackageName() + "/" + path;
        File dir = new File(fullPath);
        if (!dir.exists())
            dir.mkdir();
        for (int i = 0; i < assets.length; ++i) {
            copyFileOrDir(path + "/" + assets[i]);
        }
    }
} catch (IOException ex) {
    Log.e("tag", "I/O Exception", ex);
 }
}

private void copyFile(String filename) {
AssetManager assetManager = this.getAssets();

InputStream in = null;
OutputStream out = null;
try {
    in = assetManager.open(filename);
    String newFileName = "/data/data/" + this.getPackageName() + "/" + filename;
    out = new FileOutputStream(newFileName);

    byte[] buffer = new byte[1024];
    int read;
    while ((read = in.read(buffer)) != -1) {
        out.write(buffer, 0, read);
    }
    in.close();
    in = null;
    out.flush();
    out.close();
    out = null;
} catch (Exception e) {
    Log.e("tag", e.getMessage());
}

}

使用上面的代码调用函数与copyFileOrDir（＆＃34; myFolder＆＃34;）;

将res / raw文件夹内容文件（视频）添加到外部SD文件夹

1 个答案: