Question

我试图通过以下代码初始化图像选择器对话框： Intent chooserIntent = null;

    List<Intent> intentList = new ArrayList<>();

    Intent pickIntent = new Intent(Intent.ACTION_PICK,
            android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    Intent takePhotoIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    takePhotoIntent.putExtra("return-data", true);
    takePhotoIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(getTempFile(context)));
    intentList = addIntentsToList(context, intentList, pickIntent);
    intentList = addIntentsToList(context, intentList, takePhotoIntent);

    if (intentList.size() > 0) {
        chooserIntent = Intent.createChooser(intentList.remove(intentList.size() - 1), "");
        chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentList.toArray(new Parcelable[intentList.size()]));
    }
    startActivityForResult(chooserIntent, PICK_IMAGE_ID);

但是

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch(requestCode) {
            case PICK_IMAGE_ID:
                Bitmap bitmap = ImagePicker.getImageFromResult(this, resultCode, data);
                currentImageButton.setImageDrawable(new BitmapDrawable(bitmap));
                break;
            default:
                break;
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

我得到零意图和-1 resultCode

我已经添加了明确的权限：

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />

代码在大多数设备上运行良好但在三星二重奏上失败。哪里错了？

UPD

activity

image picker class

Answer 1

没关系，您正在获取-1 - 这意味着public static final int RESULT_OK（请参阅Activity课程）。

Null作为意图意味着您已在此处定义了输出uri：

i.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(getTempFile(context)));

（即你可以使用Uri，一旦得到确认，就完成了捕获）

关于图像选择，我是这样做的（它与Google在Taking Photos Simply文章中建议的几乎相同）：

.....
private Uri capturedImageURI;
.....

    capturedImageURI = Uri.fromFile(createImageFile());
    final Intent captureIntent = new Intent(
            android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
    captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, capturedImageURI);
    Intent chooserIntent = Intent.createChooser(new Intent(Intent.ACTION_PICK).setType("image/*"), "Select Picture");
    chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Parcelable[] { captureIntent });
    startActivityForResult(chooserIntent, 42);

.....

public File createImageFile() {
    File imageStorageDir = new File(
            Environment.getExternalStoragePublicDirectory(
                    Environment.DIRECTORY_PICTURES)
            , "MyAppPictures");

    if (!imageStorageDir.exists()) {
        imageStorageDir.mkdirs();
    }

    return new File(
            imageStorageDir + File.separator + "IMG_"
                    + String.valueOf(System.currentTimeMillis())
                    + ".jpg");
}    

.....

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == Activity.RESULT_OK) {
        if (data != null) {
             capturedImageURI = data.getData();  
        }
        ((ImageView)findViewById(R.id.capturedImageView)).setImageURI(capturedImageURI);
    }
}

NB！您需要这些权限才能使其正常运行：

<uses-feature android:name="android.hardware.camera"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

在 Android 6.0 中，您必须先检查权限，然后才能从外部存储中获取数据。

结果代码代码为-1，onActivityResult（）返回的intent为null

1 个答案: