我正在学习java。木卫一。尝试捕获屏幕时出现FileNotFoundException

Question

我已在我的Android清单文件中的应用程序标记之外设置了所有使用权限设置：

<uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />

但是当我尝试捕捉屏幕时，我收到以下错误：

JAVA木卫一。FileNotFoundException:/storage/simulated/0/DCIM/Camera/EMOJI_2-7-116_22538。jpg:打开失败：EACCES（权限被拒绝）

这是捕获屏幕的方法。

private void captureScreen() {
        Date now = new Date();
        now.getYear();
        now.getMonth();
        now.getDay();

        View v = findViewById(R.id.rl);
        v.setDrawingCacheEnabled(true);
        Bitmap bitmap = v.getDrawingCache();
        String dest = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM)
                + File.separator + "Camera" + File.separator + "EMOJI_" +
                now.getDay() + "-" + now.getMonth() + "-" + now.getYear() + "_" + now.getHours() + now.getMinutes() + now.getSeconds() + ".jpg";
        File file = new File(dest);
        try {
            FileOutputStream stream = new FileOutputStream(file);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
            stream.flush();
            stream.close();
            Toast.makeText(getApplicationContext(), "Saved !", Toast.LENGTH_SHORT).show();
        } catch (IOException e) {
            Toast.makeText(getApplicationContext(), "An error occured", Toast.LENGTH_LONG).show();
        } finally {
            v.setDrawingCacheEnabled(false);
        }

        // Scan the image to make it appear in gallery
        MediaScannerConnection.scanFile(this, new String[]{file.getPath()}, new String[]{"image/jpeg"}, null);
    }

帮我如何解决这个问题？

Answer 1

这样试试

File sd = Environment.getExternalStorageDirectory();
File image = new File(sd+filePath, imageName);
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
Bitmap bitmap = BitmapFactory.decodeFile(image.getAbsolutePath(),bmOptions);
bitmap = Bitmap.createScaledBitmap(bitmap,parent.getWidth(),parent.getHeight(),true);
imageView.setImageBitmap(bitmap);

可能对你有充分的帮助。

Answer 2

您正试图访问系统上当前不存在的文件。

而是使用。。

OutputStream out = new FileoutputStream(dest);

//这次用字符串对象而不是文件对象实例化FileOutputStream对象

Answer 3

如果您的targetSdkVersion为23或更高，您还需要在运行时请求WRITE\u EXTERNAL\u STORAGE权限。