Question

我想点击图片并将其存储在外部存储目录中。为此，我正在使用它：

public class MainActivity extends AppCompatActivity {

Button btn_pic;
ImageView iv_pic;
Context ctx = this;
Bitmap photo, bm;
String photoPath, img_dp;
private static final int CAMERA_REQUEST = 1888;
private int STORAGE_PERMISSION_CODE = 23;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    btn_pic = (Button)findViewById(R.id.btn_pic);
    iv_pic = (ImageView)findViewById(R.id.iv_pic);

    btn_pic.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");

            if(intent.resolveActivity(getPackageManager()) != null){
                File photoFile = null;

                try{
                    photoFile = createImageFile();
                }

                catch (Exception e){
                    e.printStackTrace();
                }

                if(photoFile != null){
                    Uri photoUri = FileProvider.getUriForFile(ctx, "com.example.android.fileprovider", photoFile);
                    intent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);
                    startActivityForResult(intent, CAMERA_REQUEST);
                }
            }
        }
    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == CAMERA_REQUEST && resultCode == Activity.RESULT_OK) {
        photo = (Bitmap) data.getExtras().get("data");

        bm = BitmapFactory.decodeFile(photoPath);

        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        bm.compress(Bitmap.CompressFormat.JPEG, 100, byteArrayOutputStream);
        byte[] b = byteArrayOutputStream.toByteArray();

        img_dp = Base64.encodeToString(b, Base64.DEFAULT);

        Log.i("image convert", img_dp);

        iv_pic.setImageBitmap(photo);

    }
}

private File createImageFile() throws IOException {

    String timeStamp = new SimpleDateFormat("ddmmyyyy_HHmmss").format(new Date());
    String imgFileName = "JPEG_" + timeStamp;

    File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);

    File img = File.createTempFile(imgFileName, ".jpg", storageDir);

    photoPath = img.getAbsolutePath();

    return img;
}
}

我的paths.xml文件是：

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="my_images" path="Android/data/com.falcon.apps.imagestoragedemo/files/Pictures" />
</paths>

我在AndroidManifest.xml文件中声明了一个提供程序

<provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="com.example.android.fileprovider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/paths"></meta-data>
</provider>

我收到以下错误：

The error I am getting

为什么我会收到此错误以及如何解决？

Answer 1

除了这一行，您的代码似乎还可以：

Uri photoUri = FileProvider.getUriForFile(ctx, "com.example.android.fileprovider", photoFile);

不确定为什么你有com.example.android.fileprovider或者你刚从某个在线来源复制了。

检查Android Documentation for Saving Files。它具有您需要的确切代码。

修改：链接

Edit2 ：如果IllegalArgumentException无法解决问题，请检查您的清单。

将图像存储在外部目录中时出现IllegalArgumentException错误

1 个答案: