我有一个活动拍摄照片，然后使用捕获的图像设置图像视图，然后将其上传到解析。 它与LG G4完美搭配，但是在我按下按钮说明我想要这张照片后，它会崩溃，它会在OnActivityResult功能中崩溃。 我在日志中看到有一个nullpointerexception，我想因为galaxy s4比LG G4有更少的内存。 我想我理解这个问题（我对记忆的假设），但不知道如何解决它。
活动
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.PersistableBundle;
import android.preference.PreferenceManager;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import com.parse.FindCallback;
import com.parse.GetDataCallback;
import com.parse.ParseException;
import com.parse.ParseFile;
import com.parse.ParseObject;
import com.parse.ParseQuery;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
public class SituationStatusActivity extends AppCompatActivity {
ImageView imVCature_pic_nir;
ImageView imVCature_pic_sharon;
private static final int REQUEST_CODE = 1;
String imageFilePath;
public SharedPreferences startExplePref;
public String user;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_situation_status);
if(savedInstanceState!=null){
imageFilePath = savedInstanceState.getString("path");
}
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
overridePendingTransition(R.anim.fadein, R.anim.fadeout);
// get the user
startExplePref = PreferenceManager.getDefaultSharedPreferences(this);
user = startExplePref.getString("user", "");
// upload nir Pic
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
imageFilePath = Environment.getExternalStorageDirectory().toString() + "/Android/data/com.my.app/Image-" + timeStamp + ".png";
imVCature_pic_nir = (ImageView) findViewById(R.id.nirPic);
imVCature_pic_sharon = (ImageView) findViewById(R.id.sharonPic);
Button uploadPic = (Button) findViewById(R.id.picUploadButton);
uploadPic.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) { /*************************** Camera Intent Start ************************/
File imageFile = new File(imageFilePath);
Uri imageFileUri = Uri.fromFile(imageFile); // convert path to Uri
// Standard Intent action that can be sent to have the camera
// application capture an image and return it.
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageFileUri); // set the image file name
startActivityForResult(intent, 1);
/*************************** Camera Intent End ************************/
}
});
UpdatePic();
}
@Override
public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {
outState.putString("path", imageFilePath);
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// if picture was taken
if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {
BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
bmpFactoryOptions.inJustDecodeBounds = true;
bmpFactoryOptions.inSampleSize = 5;
bmpFactoryOptions.inJustDecodeBounds = false;
//imageFilePath image path which you pass with intent
Bitmap bp = BitmapFactory.decodeFile(imageFilePath, bmpFactoryOptions);
//rotate image by 90 degrees
Matrix rotateMatrix = new Matrix();
rotateMatrix.postRotate(90);
Bitmap rotatedBitmap = Bitmap.createBitmap(bp, 0, 0, bp.getWidth(), bp.getHeight(), rotateMatrix, false);
//
Drawable d = new BitmapDrawable(rotatedBitmap);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
// // Compress image to lower quality scale 1 - 100
rotatedBitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte[] image = stream.toByteArray();
//
// // Create the ParseFile
ParseFile file = new ParseFile("image.png", image);
// // Upload the image into Parse Cloud
file.saveInBackground();
//
// // Create a New Class called "ImageUpload" in Parse
ParseObject SituationPic = new ParseObject("SituationPic");
//
// // Create a column named "ImageName" and set the string
SituationPic.put("ImageName", "First Pic");
//
SituationPic.put("user", user);
// // Create a column named "ImageFile" and insert the image
SituationPic.put("ImageFile", file);
//
// // Create the class and the columns
SituationPic.saveInBackground();
if (user.equals("nir")) {
imVCature_pic_nir.setImageBitmap(getRoundedCornerBitmap(rotatedBitmap, 500));
imVCature_pic_nir.setScaleType(ImageView.ScaleType.FIT_XY);
} else if (user.equals("sharon")) {
imVCature_pic_sharon.setImageBitmap(getRoundedCornerBitmap(rotatedBitmap, 500));
imVCature_pic_sharon.setScaleType(ImageView.ScaleType.FIT_XY);
} else {
Toast.makeText(SituationStatusActivity.this, "error", Toast.LENGTH_LONG).show();
}
// if picture was not taken
} else {
Toast.makeText(getApplicationContext(), "not taken", Toast.LENGTH_LONG).show();
}
// UpdatePic();
}
public Bitmap nirBitmap;
public Bitmap sharonBitmap;
//change it to load in the beginiing
public void UpdatePic()
{
// Update photo of nir
ParseQuery<ParseObject> querynir = ParseQuery.getQuery("SituationPic");
querynir.orderByDescending("updatedAt");
querynir.whereEqualTo("user", "nir");
querynir.findInBackground(new FindCallback<ParseObject>() {
@Override
public void done(List<ParseObject> objects, ParseException e) {
ParseObject object = objects.get(0);
ParseFile applicantResume = (ParseFile) object.get("ImageFile");
applicantResume.getDataInBackground(new GetDataCallback() {
public void done(byte[] data, ParseException e) {
if (e == null) {
Bitmap bmp = BitmapFactory.decodeByteArray(data, 0,
data.length);
Matrix rotateMatrix = new Matrix();
rotateMatrix.postRotate(360);
Bitmap rotatedBitmap = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), rotateMatrix, false);
nirBitmap = rotatedBitmap;
imVCature_pic_nir.setImageBitmap(getRoundedCornerBitmap(rotatedBitmap, 500));
imVCature_pic_nir.setScaleType(ImageView.ScaleType.FIT_XY);
}
}
});
}
});
// Update photo of sharon
ParseQuery<ParseObject> querySHN = ParseQuery.getQuery("SituationPic");
querySHN.orderByDescending("updatedAt");
querySHN.whereEqualTo("user", "sharon");
querySHN.findInBackground(new FindCallback<ParseObject>() {
@Override
public void done(List<ParseObject> objects, ParseException e) {
ParseObject object = objects.get(0);
ParseFile applicantResume = (ParseFile) object.get("ImageFile");
applicantResume.getDataInBackground(new GetDataCallback() {
public void done(byte[] data, ParseException e) {
if (e == null) {
Bitmap bmp = BitmapFactory.decodeByteArray(data, 0,
data.length);
Matrix rotateMatrix = new Matrix();
rotateMatrix.postRotate(180);
Bitmap rotatedBitmap = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), rotateMatrix, false);
sharonBitmap = rotatedBitmap;
imVCature_pic_sharon.setImageBitmap(getRoundedCornerBitmap(rotatedBitmap, 500));
imVCature_pic_sharon.setScaleType(ImageView.ScaleType.FIT_XY);
}
}
});
}
});
}
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = pixels;
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
}
LogCat
FATAL EXCEPTION: main
Process: fastner.israel.nir_zabari.onelove, PID: 31324
java.lang.RuntimeException: Unable to resume activity {fastner.israel.nir_zabari.onelove/fastner.israel.nir_zabari.onelove.SituationStatusActivity}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {fastner.israel.nir_zabari.onelove/fastner.israel.nir_zabari.onelove.SituationStatusActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3394)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3425)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2763)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4462)
at android.app.ActivityThread.access$1000(ActivityThread.java:177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1454)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5942)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
Caused by: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {fastner.israel.nir_zabari.onelove/fastner.israel.nir_zabari.onelove.SituationStatusActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:4058) at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3380)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3425)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2763)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4462)
at android.app.ActivityThread.access$1000(ActivityThread.java:177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1454)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5942)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference
at fastner.israel.nir_zabari.onelove.SituationStatusActivity.onActivityResult(SituationStatusActivity.java:117)
at android.app.Activity.dispatchActivityResult(Activity.java:6549)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4054)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3380)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3425)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2763)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4462)
at android.app.ActivityThread.access$1000(ActivityThread.java:177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1454)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5942)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
答案 0 :(得分：0)
在使用解码位图进行任何工作之前，您需要检查它是否实际上已经解码好了。
// Code above
if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {
BitmapFactory.Options bmpFactoryOptions = new mapFactory.Options();
bmpFactoryOptions.inJustDecodeBounds = true;
bmpFactoryOptions.inSampleSize = 5;
bmpFactoryOptions.inJustDecodeBounds = false;
//imageFilePath image path which you pass with intent
Bitmap bp = BitmapFactory.decodeFile(imageFilePath, bmpFactoryOptions);
if (bp != null) {
//rotate image by 90 degrees
Matrix rotateMatrix = new Matrix();
rotateMatrix.postRotate(90);
Bitmap rotatedBitmap = Bitmap.createBitmap(bp, 0, 0, bp.getWidth(), bp.getHeight(), rotateMatrix, false);
}
// Code below