Question

我尝试记住对话框中的复选框，但相比之下，记住== false，变量记住仍然没有更改其值。在循环中，在调用showDialogSameFile（）之前迭代的次数与lelements_tmp一样多，所以我也不能在循环中使用变量。我该怎么做？提前谢谢。

private boolean remember = false;

// in the program
// add files to List lelements_tmp
while (i < lelements_tmp.size()) {
    File fto = new File(lelements_tmp.get(i).getFile());
    String to = null;
    try {
        to = fto.getCanonicalPath();
    } catch (IOException e) {
        e.printStackTrace();
    }

    if (fto.exists()) {
        showDialogSameFile(fto, to, i);
        i++;
        continue;
    }

    thread(i);
    i++;
}

private void showDialogSameFile(File f, String to, final int i) {
        TextView title = null;
        if (f.isDirectory())
            title = this.getTitle("The directory " + to + " already exists. Do you want to replace the contents?");
        else if (f.isFile())
            title = this.getTitle("The file " + to + " already exists. Do you want to replace it?");

        String[] item = {"Apply to all"};
        AlertDialog ad = new AlertDialog.Builder(context)
                .setCustomTitle(title)
                .setMultiChoiceItems(item, null,
                        new DialogInterface.OnMultiChoiceClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int indexSelected, boolean isChecked) {
                                if (isChecked)
                                    remember = true;
                            }
                        })
                .setPositiveButton("Aceptar",
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                thread(i);
                            }
                        })
                .setNegativeButton("Cancelar",
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {

                            }
                        })
                .create();
    if (remember == false)
            ad.show();
}

Answer 1

我必须稍微重构代码，但基本上是这项工作。有必要从非UI线程调用该方法。根据此回复https://stackoverflow.com/a/11369224/5089855

#include <stdio.h>
#include <iostream>
#include <iomanip>

using namespace std;


int main(int argc, char **argv) {
    FILE *pPipe;
    long lSize;
    char * imgdata;
    int imgcols = 640, imgrows = 480, elemSize = 3;

    imgdata = ...;

    stringstream sstm;
    sstm << "/usr/local/bin/ffmpeg -y -f rawvideo -vcodec rawvideo -s " << imgcols << "x" << imgrows  <<" -pix_fmt rgb24 -i - -c:v libx264 -shortest my_output.mp4";

    if ( !(pPipe = popen(sstm.str().c_str(), "w")) ) {
        cout << "popen error" << endl;
        exit(1);
    }

    // open a pipe to FFmpeg
    lSize = imgrows * imgcols * elemSize;

    // write to pipe
    fwrite(imgdata, 1, lSize, pPipe);
    fflush(pPipe);
    fclose(pPipe);

    return 0;

}

记住对话框中的复选框

1 个答案: