我正在做一个应用程序从相机拍摄图像然后裁剪它，但有些我如何丢失我的活动的对象，当它返回时，我得到NullPointerExeception，在它的OnCreate方法。但是当我从画廊中选择一个图像时，它可以正常工作，因为它不会关闭活动。
public void onClick(DialogInterface dialog, int item) {
if (items[item].equals("Camera")) {
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
intent.putExtra("return-data", true);
startActivityForResult(intent, Constants.PICK_FROM_CAMERA);
} else if (items[item].equals("Galeria")) {
Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType("image/*");
// ******** code for crop image
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("outputX", 100);
intent.putExtra("outputY", 100);
intent.putExtra("max-height", 800);
intent.putExtra("max-width", 800);
intent.putExtra("return-data", true);
intent.putExtra("scaleType", "centerCrop");
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
try {
startActivityForResult(Intent.createChooser(intent,
"Complete action using"), Constants.PICK_FROM_GALLERY);
} catch (ActivityNotFoundException e) {
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Bitmap tempImage;
OutputStream fOut = null;
File root = new File(Environment.getExternalStorageDirectory()
+ File.separator);
try {
File sdImageMainDirectory = new File(root, "foto.jpg");
fOut = new FileOutputStream(sdImageMainDirectory);
} catch (Exception e) {
e.printStackTrace();
}
if (requestCode == Constants.PICK_FROM_CAMERA) {
root = new File(Environment.getExternalStorageDirectory()
+ File.separator + "foto.jpg");
Bitmap photo = (Bitmap) data.getExtras().get("data");
saveBitmap(photo, Environment.getExternalStorageDirectory()
+ File.separator + "foto.jpg");
try{
cropCapturedImage(Uri.fromFile(root));
}catch(ActivityNotFoundException aNFE){
//display an error message if user device doesn't support
String errorMessage = "Desculpe, seu dispositivo não suporta Crop!";
Toast toast = Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT);
toast.show();
}
}
if (requestCode == Constants.PICK_FROM_GALLERY && data != null) {
Bundle extras2 = data.getExtras();
if (extras2 != null) {
Bitmap photo = extras2.getParcelable("data");
this.photo.setImageBitmap(photo);
this.photo.buildDrawingCache();
tempImage = this.photo.getDrawingCache();
try {
tempImage.compress(Bitmap.CompressFormat.JPEG, 100, fOut);
fOut.flush();
fOut.close();
BasicUserPerson.getInstance().setPhotoPath(
Environment.getExternalStorageDirectory()
+ File.separator + "foto.jpg");
} catch (Exception e) {
e.printStackTrace();
}
}
}
//user is returning from cropping the image
else if(requestCode == Constants.PIC_CROP && data != null){
//get the returned data
Bundle extras = data.getExtras();
if (extras != null){
Bitmap thePic = (Bitmap) data.getExtras().get("data");
saveBitmap(thePic, Environment.getExternalStorageDirectory()
+ File.separator + "foto.jpg");
photo.setImageBitmap(thePic);
BasicUserPerson.getInstance().setPhotoPath(
Environment.getExternalStorageDirectory()
+ File.separator + "foto.jpg");
}
}
}
public void saveBitmap(Bitmap photo, String path) {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
photo.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
File f = new File(path);
try {
f.createNewFile();
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
fo.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public void cropCapturedImage(Uri picUri){
Intent cropIntent = new Intent("com.android.camera.action.CROP");
cropIntent.setDataAndType(picUri, "image/*");
cropIntent.putExtra("crop", "true");
cropIntent.putExtra("aspectX", 1);
cropIntent.putExtra("aspectY", 1);
cropIntent.putExtra("outputX", 256);
cropIntent.putExtra("outputY", 256);
cropIntent.putExtra("return-data", true);
cropIntent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
startActivityForResult(cropIntent, Constants.PIC_CROP);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.dados_pessoais);
fullName = (EditText) findViewById(R.id.edtFullName);
cpf = (EditText) findViewById(R.id.edtCpf);
email = (EditText) findViewById(R.id.edtDadEmail);
ddd = (EditText) findViewById(R.id.edtDadDDD);
telefone = (EditText) findViewById(R.id.edtDadTele);
ddd2 = (EditText) findViewById(R.id.edtDadDDD2);
celular = (EditText) findViewById(R.id.edtDadTel);
btSalvar = (ImageView) findViewById(R.id.imgSalvar);
head = (ImageView) findViewById(R.id.imgDadosHead);
sexo = (Spinner) findViewById(R.id.spnSex);
birthday = (EditText) findViewById(R.id.edtBrithday);
civil = (Spinner) findViewById(R.id.spnCivil);
loadingCity = (ImageView) findViewById(R.id.imgLoadingCity);
escolaridade = (Spinner) findViewById(R.id.spnEscolaridade);
cep = (EditText) findViewById(R.id.edtCep);
state = (Spinner) findViewById(R.id.spnState);
city = (Spinner) findViewById(R.id.spnCity);
endereco = (EditText) findViewById(R.id.edtEndereco);
bairro = (EditText) findViewById(R.id.edtBairro);
num = (EditText) findViewById(R.id.edtNum);
comp = (EditText) findViewById(R.id.edtComp);
photo = (ImageView) findViewById(R.id.imgPhoto);
btSalvar.setOnClickListener(this);
photo.setOnClickListener(this);
//Line of error
if (!User.getInstance().getFullName().equals("null") && !User.getInstance().getFullName().equals("")){
fullName.setText(User.getInstance().getFullName());
}
if (!BasicUserPerson.getInstance().getPersonRegistration().equals("null") && !BasicUserPerson.getInstance().getPersonRegistration().equals("")){
cpf.setText(BasicUserPerson.getInstance().getPersonRegistration());
}
if (!User.getInstance().getEmail().equals("null") && !User.getInstance().getEmail().equals("null")){
email.setText(User.getInstance().getEmail());
}
email.setKeyListener(null);
if (!BasicUserPerson.getInstance().getMobilePhone().equals("null") && !BasicUserPerson.getInstance().getMobilePhone().equals("")){
String tel = BasicUserPerson.getInstance().getMobilePhone().replace("(", "").replace(")", "").replace(" ", "");
ddd.setText(tel.subSequence(0, 2));
celular.setText(tel.substring(2));
}
if (!BasicUserPerson.getInstance().getPhone().equals("null") && !BasicUserPerson.getInstance().getPhone().equals("")){
String tel = BasicUserPerson.getInstance().getPhone().replace("(", "").replace(")", "").replace(" ", "");
ddd2.setText(tel.subSequence(0, 2));
telefone.setText(tel.substring(2));
}
if (!BasicUserPerson.getInstance().getBirthday().equals("null") && !BasicUserPerson.getInstance().getBirthday().equals("")){
birthday.setText(BasicUserPerson.getInstance().getBirthday());
}
if (!BasicUser.getInstance().locationObj.getZipCode().equals("null") && !BasicUser.getInstance().locationObj.getZipCode().equals("")){
cep.setText(BasicUser.getInstance().locationObj.getZipCode());
}
if (!BasicUser.getInstance().locationObj.getAddress().equals("null") && !BasicUser.getInstance().locationObj.getAddress().equals("")){
endereco.setText(BasicUser.getInstance().locationObj.getAddress());
}
if (!BasicUser.getInstance().locationObj.getNeighborhood().equals("null") && !BasicUser.getInstance().locationObj.getNeighborhood().equals("")){
bairro.setText(BasicUser.getInstance().locationObj.getNeighborhood());
}
}
它输出：
12-15 21:22:55.002: E/AndroidRuntime(2263): FATAL EXCEPTION: main
12-15 21:22:55.002: E/AndroidRuntime(2263): Process: br.com.inradar, PID: 2263
12-15 21:22:55.002: E/AndroidRuntime(2263): java.lang.RuntimeException: Unable to start activity ComponentInfo{br.com.inradar/br.com.inradar.activities.DadosPessoais}: java.lang.NullPointerException
12-15 21:22:55.002: E/AndroidRuntime(2263): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2202)
12-15 21:22:55.002: E/AndroidRuntime(2263): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2252)
12-15 21:22:55.002: E/AndroidRuntime(2263): at android.app.ActivityThread.access$800(ActivityThread.java:139)
12-15 21:22:55.002: E/AndroidRuntime(2263): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1200)
12-15 21:22:55.002: E/AndroidRuntime(2263): at android.os.Handler.dispatchMessage(Handler.java:102)
12-15 21:22:55.002: E/AndroidRuntime(2263): at android.os.Looper.loop(Looper.java:136)
12-15 21:22:55.002: E/AndroidRuntime(2263): at android.app.ActivityThread.main(ActivityThread.java:5103)
12-15 21:22:55.002: E/AndroidRuntime(2263): at java.lang.reflect.Method.invokeNative(Native Method)
12-15 21:22:55.002: E/AndroidRuntime(2263): at java.lang.reflect.Method.invoke(Method.java:515)
12-15 21:22:55.002: E/AndroidRuntime(2263): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
12-15 21:22:55.002: E/AndroidRuntime(2263): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:606)
12-15 21:22:55.002: E/AndroidRuntime(2263): at dalvik.system.NativeStart.main(Native Method)
12-15 21:22:55.002: E/AndroidRuntime(2263): Caused by: java.lang.NullPointerException
12-15 21:22:55.002: E/AndroidRuntime(2263): at br.com.inradar.activities.DadosPessoais.onCreate(DadosPessoais.java:176)
12-15 21:22:55.002: E/AndroidRuntime(2263): at android.app.Activity.performCreate(Activity.java:5275)
12-15 21:22:55.002: E/AndroidRuntime(2263): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
12-15 21:22:55.002: E/AndroidRuntime(2263): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2166)
12-15 21:22:55.002: E/AndroidRuntime(2263): ... 11 more
答案 0 :(得分：1)
你是否以这种方式使用
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
if(resultCode == RESULT_OK) {
// stub here
}
}
}