从“照片”应用中选择图像时如何修复布尔android.graphics.Bitmap.compress？

Question

在我的应用程序中，我想从图库中选择图像并进行裁剪，然后转换为base64 。

在我的应用程序中，我想从图库中选择图像并进行裁剪，然后转换为base64 。
当我从图库中选择图像时，不会显示我错误 ，但是从“照片”应用中选择图像时，会显示此错误！

错误：

FATAL EXCEPTION: main

Process: com.app.test, PID: 19778                                                                         
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null,request=131073, result=0, data=Intent {  launchParam=MultiScreenLaunchParams { mDisplayId=0 mFlags=0 }(has extras) }} to activity {com.app.test/com.app.test.Activity.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
    at android.app.ActivityThread.deliverResults(ActivityThread.java:4550)
    at android.app.ActivityThread.handleSendResult(ActivityThread.java:4593)
    at android.app.ActivityThread.-wrap22(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1709)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6724)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
    at com.bidzila.android.Utils.Base64ConverterUtils.convert(Base64ConverterUtils.java:25)
    at com.bidzila.android.Fragments.DashBoardFragment.onActivityResult(DashBoardFragment.java:172)
    at android.support.v4.app.FragmentActivity.onActivityResult(FragmentActivity.java:159)
    at android.app.Activity.dispatchActivityResult(Activity.java:7256)
    at android.app.ActivityThread.deliverResults(ActivityThread.java:4546)

转换器类别：

public class Base64ConverterUtils {
    public static Bitmap convert(String base64Str) throws IllegalArgumentException {
        byte[] decodedBytes = Base64.decode(
                base64Str.substring(base64Str.indexOf(",") + 1),
                Base64.DEFAULT
        );

        return BitmapFactory.decodeByteArray(decodedBytes, 0, decodedBytes.length);
    }

    public static String convert(Bitmap bitmap) {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream);

        return Base64.encodeToString(outputStream.toByteArray(), Base64.DEFAULT);
    }
}

我的片段类：

public class DashBoardFragment extends BaseFragment {

    /*    @BindView(R.id.addPhoto)
        ImageView addPhoto;*/
    private Handler handler;
    private Context context;
    private View v;
    private PrefsUtils prefsUtils;
    private ImageView addPhoto;
    private LinearLayout noLoginFrag_btn;
    private TextView textView2, dash_winnerTxt, dash_allBidsTxt, dash_allBidsTxt2, dash_winnerTxt2, dash_notWinTxt, dash_bougthTxt;
    private ProgressBar profileProgress;
    private File file;
    private Uri uri;
    private Intent CamIntent, GalIntent, CropIntent;
    public static final int RequestPermissionCode = 1;
    private DisplayMetrics displayMetrics;
    private int width, height;
    private String base64String, base64StringForSite;
    private APIs apIs;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        handler = new Handler();
        context = getActivity();
        prefsUtils = new PrefsUtils(context);
        if (prefsUtils.isExist(PrefsKeys.PHONE_NUMBER.name())) {
            v = inflater.inflate(R.layout.fragment_dashboard, null);
            addPhoto = v.findViewById(R.id.addPhoto);
            textView2 = v.findViewById(R.id.textView2);
            dash_winnerTxt = v.findViewById(R.id.dash_winnerTxt);
            dash_allBidsTxt = v.findViewById(R.id.dash_allBidsTxt);
            dash_allBidsTxt2 = v.findViewById(R.id.dash_allBidsTxt2);
            dash_winnerTxt2 = v.findViewById(R.id.dash_winnerTxt2);
            dash_notWinTxt = v.findViewById(R.id.dash_notWinTxt);
            dash_bougthTxt = v.findViewById(R.id.dash_bougthTxt);
            profileProgress = v.findViewById(R.id.profileProgress);
            apIs = ApiClient.getClient().create(APIs.class);

            handler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    try {
                        textView2.setText(Constants.profileResponse.getRes().getUser().getName());
                        dash_winnerTxt.setText(Constants.profileResponse.getRes().getWinner() + "");
                        dash_winnerTxt2.setText(Constants.profileResponse.getRes().getWinner() + "");
                        dash_allBidsTxt.setText(Constants.profileResponse.getRes().getRegistered() + "");
                        dash_allBidsTxt2.setText(Constants.profileResponse.getRes().getRegistered() + "");
                        dash_bougthTxt.setText(Constants.profileResponse.getRes().getBought() + "");
                        dash_notWinTxt.setText(Constants.profileResponse.getRes().getRegistered() - Constants.profileResponse.getRes().getWinner() + "");

                        Glide.with(context)
                                .load(Constants.SERVERImg + Constants.profileResponse.getRes().getUser().getAvatarFile())
                                .asBitmap()
                                .centerCrop()
                                //.diskCacheStrategy(DiskCacheStrategy.NONE)
                                //.skipMemoryCache(true)
                                .signature(new StringSignature(String.valueOf(System.currentTimeMillis())))
                                .into(new BitmapImageViewTarget(addPhoto) {
                                    @Override
                                    protected void setResource(Bitmap resource) {
                                        RoundedBitmapDrawable circularBitmapDrawable =
                                                RoundedBitmapDrawableFactory.create(context.getResources(), resource);
                                        circularBitmapDrawable.setCircular(true);
                                        addPhoto.setImageDrawable(circularBitmapDrawable);
                                    }
                                });

                        addPhoto.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View view) {
                                getImageFromGallery();
                            }
                        });
                    } catch (Exception e) {
                    }
                }
            }, 1000);

        } else {
            v = inflater.inflate(R.layout.fragment_no_login_dash, null);
            noLoginFrag_btn = v.findViewById(R.id.noLoginFrag_btn);
            noLoginFrag_btn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    startActivity(new Intent(context, RegisterPhoneActivity.class));
                    getActivity().finish();
                }
            });
        }

        return v;
    }

    @Override
    public void onActivityResult(final int requestCode, int resultCode, Intent data) {
        if (requestCode == 0 && resultCode == RESULT_OK) {
            imageCropFunction();
        } else if (requestCode == 2) {
            if (data != null) {
                uri = data.getData();
                imageCropFunction();
            }
        } else if (requestCode == 1) {

            if (data != null) {
                Bundle bundle = data.getExtras();
                Bitmap bitmap = bundle.getParcelable("data");
                base64String = Base64ConverterUtils.convert(bitmap);

                Bitmap bitmap1 = Base64ConverterUtils.convert(base64String);
                addPhoto.setImageBitmap(bitmap1);

                profileProgress.setVisibility(View.VISIBLE);
                addPhoto.setVisibility(View.GONE);

                Call<ProfileResponse> call = apIs.getUploadBase64Avatar(sendBase64Image(prefsUtils.getFromShared(PrefsKeys.PHONE_NUMBER.name()), base64String, "jpg"));
                call.enqueue(new Callback<ProfileResponse>() {
                    @Override
                    public void onResponse(Call<ProfileResponse> call, Response<ProfileResponse> response) {
                        if (response.body().getStatus().equals("ok")) {
                            profileProgress.setVisibility(View.GONE);
                            addPhoto.setVisibility(View.VISIBLE);
                            Glide.with(context)
                                    .load(Constants.SERVERImg + Constants.profileResponse.getRes().getUser().getAvatarFile())
                                    .asBitmap()
                                    .centerCrop()
                                    //.diskCacheStrategy(DiskCacheStrategy.NONE)
                                    //.skipMemoryCache(true)
                                    .signature(new StringSignature(String.valueOf(System.currentTimeMillis())))
                                    .into(new BitmapImageViewTarget(addPhoto) {
                                        @Override
                                        protected void setResource(Bitmap resource) {
                                            RoundedBitmapDrawable circularBitmapDrawable =
                                                    RoundedBitmapDrawableFactory.create(context.getResources(), resource);
                                            circularBitmapDrawable.setCircular(true);
                                            addPhoto.setImageDrawable(circularBitmapDrawable);
                                        }
                                    });
                        }
                    }

                    @Override
                    public void onFailure(Call<ProfileResponse> call, Throwable t) {
                        profileProgress.setVisibility(View.GONE);
                    }
                });
            }
        }
    }

    private void imageCropFunction() {

        try {
            CropIntent = new Intent("com.android.camera.action.CROP");

            CropIntent.setDataAndType(uri, "image/*");

            CropIntent.putExtra("crop", "true");
            CropIntent.putExtra("outputX", 200);
            CropIntent.putExtra("outputY", 200);
            CropIntent.putExtra("aspectX", 3);
            CropIntent.putExtra("aspectY", 3);
            CropIntent.putExtra("scaleUpIfNeeded", true);
            CropIntent.putExtra("return-data", true);

            startActivityForResult(CropIntent, 1);

        } catch (ActivityNotFoundException e) {

        }
    }


    private void getImageFromGallery() {
        GalIntent = new Intent(Intent.ACTION_PICK,
                android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

        startActivityForResult(Intent.createChooser(GalIntent, "Select image"), 2);

    }

我该如何解决？

Answer 1

NullPointerException告诉您，您正在尝试对对象执行某些操作，该对象似乎为空。 您将不得不调试为什么传递给函数的位图（不是base64表示形式）为null，也许您将其错误地放入了参数Bundle中。

很难给出正确的答案，因为我看不到异常标记的哪几行，因此您必须自己做一点：）

Answer 2

因为位图为空，所以导致错误。

声明位图位图； 作为全局变量。

并在onActivityResult方法中使用位图对象。