安卓开发之android 拍照和相册选择图片例子

android从选择图片有两种方法，但是返回值确不同，本文将指导大家如何统一这两种方式的返回值。

//关键代码
 @Event(R.id.btnPhoto)
    private void onBtnPhotoClicked(View view) {
        Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(intent, Config.Constants.CODE_PICK_IMAGE_FROM_PHOTO);
    }
 
    @Event(R.id.btnCamera)
    private void onBtnCameraClicked(View view) {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intent, Config.Constants.CODE_PICK_IMAGE_FROM_CAMERA);
    }
 
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case Config.Constants.CODE_PICK_IMAGE_FROM_CAMERA:
                if (data != null && data.hasExtra("data")) {
                    Bitmap bitmap = data.getParcelableExtra("data");
                    bitmap = BitmapUtil.scale(bitmap, 640.0f / bitmap.getWidth());
                    try {
                        File path = new File(((MyApplication) getApplication()).appPath, DateUtil.format(new Date(), "yyyyMMddHHmmss") + ".jpg");
                        FileOutputStream outputStream = new FileOutputStream(path);
                        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
                        outputStream.close();
                        Intent intent = new Intent();
                        intent.putExtra("path", path.getAbsolutePath());
                        setResult(RESULT_OK, intent);
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                finish();
                break;
            case Config.Constants.CODE_PICK_IMAGE_FROM_PHOTO:
                if(data != null){
                    Uri uri = data.getData();
                    Bitmap bitmap;
                    ContentResolver contentResolver = getContentResolver();
                    try {
                        bitmap = MediaStore.Images.Media.getBitmap(contentResolver, uri);
                        bitmap = BitmapUtil.scale(bitmap, 640.0f / bitmap.getWidth());
                        File path = new File(((MyApplication) getApplication()).appPath, DateUtil.format(new Date(), "yyyyMMddHHmmss") + ".jpg");
                        FileOutputStream outputStream = new FileOutputStream(path);
                        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
                        outputStream.close();
                        Intent intent = new Intent();
                        intent.putExtra("path", path.getAbsolutePath());
                        setResult(RESULT_OK, intent);
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                finish();
                break;
            default:
                super.onActivityResult(requestCode, resultCode, data);
        }
    }
//BitmapUtil.java
public static Bitmap scale(Bitmap bitmap, float scale) {
    Matrix matrix = new Matrix();
    matrix.postScale(scale, scale);
    return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
}
 
//MyApplication
public File appPath;
 
@Override
public void onCreate() {
    super.onCreate();
    //创建目录
    appPath = new File(Environment.getExternalStorageDirectory(), getPackageName());
    if (!appPath.isDirectory()) {
        appPath.mkdir();
    }
}
经过统一处理之后，返回值均为图片的绝对路径地址。