从存储中删除图像

Question

我想从存储中删除一个图像文件，但它返回 false。

我在我的应用中创建，我可以删除它，但是当我重新安装我的应用时，我可以显示它，但我不能删除它

这是我的代码：

if (ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
    File file = new File(cartPostalDbs.get(position).getFilePath());
    boolean deleted = file.delete();
    if (deleted) {
        cartPostalDbs.remove(mPos);
        notifyDataSetChanged();
    } else {
        Toast.makeText(context, "Can Not Delete File", Toast.LENGTH_SHORT).show();
    }
}

这是我的文件路径

/storage/emulated/0/Pictures/yadim/1/1558.jpg

我检查了 PERMISSION 并使用此权限：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" />

Answer 1

这就是你所需要的，它适用于多种情况：

•如果要删除目录（文件夹） •如果您要删除的文件/目录不存在

代码如下：

public void deleteFile(String path) {
    File file = new File(path);

    if (!file.exists()) return;

    if (file.isFile()) {
        file.delete();
        return;
    }

    File[] fileArr = file.listFiles();

    if (fileArr != null) {
        for (File subFile : fileArr) {
            if (subFile.isDirectory()) {
                deleteFile(subFile.getAbsolutePath());
            }

            if (subFile.isFile()) {
                subFile.delete();
            }
        }
    }

    file.delete();
}

用法：

deleteFile(cartPostalDbs.get(position).getFilePath());

您的最终代码应如下所示：

if (ContextCompat.checkSelfPermission(context, 
Manifest.permission.WRITE_EXTERNAL_STORAGE) == 
PackageManager.PERMISSION_GRANTED) {
try {
deleteFile(cartPostalDbs.get(position).getFilePath());
boolean deleted = true;
} catch ( Exception e ) { boolean deleted = false; }
if (deleted) {
    cartPostalDbs.remove(mPos);
    notifyDataSetChanged();
} else {
    Toast.makeText(context, "Can Not Delete File", 
Toast.LENGTH_SHORT).show();
}
}

编辑 1： 如果未授予权限，我尝试编辑代码以请求权限：

if (ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
try {
    deleteFile(cartPostalDbs.get(position).getFilePath());
    boolean deleted = true;
} catch ( Exception e ) { boolean deleted = false; }
if (deleted) {
        cartPostalDbs.remove(mPos);
        notifyDataSetChanged();
} else {

    requestPermissions(new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1000);

}
}

添加 onActivityResult void 以在授予权限时删除文件：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    
    super.onActivityResult(requestCode, resultCode, data);
    
    switch (requestCode) {
            case 1000:
            if (resultCode == Activity.RESULT_OK) {
        if (ContextCompat.checkSelfPermission(context, 
        Manifest.permission.WRITE_EXTERNAL_STORAGE) == 
        PackageManager.PERMISSION_GRANTED) {
                try {
                        deleteFile(cartPostalDbs.get(position).getFilePath());
                        boolean deleted = true;
                } catch ( Exception e ) { boolean deleted = false; }
                if (deleted) {
                            cartPostalDbs.remove(mPos);
                            notifyDataSetChanged();
                } else {
                        Toast.makeText(context, "Can Not Delete File", Toast.LENGTH_SHORT).show();
                }
        }
    } else {
        Toast.makeText(context, "Can Not Delete File", Toast.LENGTH_SHORT).show();
    }
            break;
            default:
            break;
    }
}

另外别忘了给AndroidManifest.xml文件添加权限