小编Noa*_*ram的帖子

在android Java上工作，最近将SDK更新到API级别29，现在显示警告，指出

Environment.getExternalStorageDirectory() 在API级别29中已弃用

我的代码是

private void saveImage() {

if (requestPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE)) {

    final String folderPath = Environment.getExternalStorageDirectory() + "/PhotoEditors";
    File folder = new File(folderPath);
    if (!folder.exists()) {
        File wallpaperDirectory = new File(folderPath);
        wallpaperDirectory.mkdirs();
    }


    showLoading("Saving...");
    final String filepath=folderPath
                + File.separator + ""
                + System.currentTimeMillis() + ".png";
    File file = new File(filepath);

    try {
        file.createNewFile();
        SaveSettings saveSettings = new SaveSettings.Builder()
                .setClearViewsEnabled(true)
                .setTransparencyEnabled(true)
                .build();
        if(isStoragePermissionGranted() ) {
            mPhotoEditor.saveAsFile(file.getAbsolutePath(), saveSettings, new PhotoEditor.OnSaveListener() {
            @Override
            public void onSuccess(@NonNull String imagePath) {
                hideLoading();
                showSnackbar("Image Saved …

1）目标设定为Android Q与android.permission.WRITE_EXTERNAL_STORAGE

2）使用getExternalStorageDirectory或getExternalStoragePublicDirectory并FileOutputStream(file)保存文件抛出

java.io.FileNotFoundException: /storage/emulated/0/myfolder/mytext.txt open failed: ENOENT (No such file or directory)

3）使用getExternalFilesDirapi并保存成功但即使之后也不会出现MediaScannerConnection.scanFile。

     /storage/emulated/0/Android/data/my.com.ui/files/Download/myfolder/mytext.txt

在android Q中将文件从内部存储器复制到SDCARD并刷新的最佳方法是什么。

如何在一些间隔之后逐个动画多个对象android我正在使用此代码进行动画制作

 for (int y = 0; y < 10; y++) {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                }
                Toast.makeText(ProjectFirstActivity.this, y + "",
                        Toast.LENGTH_SHORT).show();
                ObjectAnimator oa = ObjectAnimator.ofFloat(myimageview[y],
                        "translationY", 0, -200);
                oa.setDuration(1000);
                oa.start();
            }
        });
    }

但它一气呵成,但我希望逐一动画我的imageview请帮忙