这是我的MainActivity其他函数除了buttonUpload外实际上有效。不幸的是，当我点击buttonUpload时，app停止了。
有什么见解人吗？非常需要。 而且我的logcat不能用于android studio 2.3.1 idk为什么
public class MainActivity extends AppCompatActivity {
private TrackGPS gps;
private Button buttonUpload;
private EditText editTextMessage;
double longitude;
double latitude;
private StorageReference storage;
private static final int CAMERA_REQUEST_CODE = 1;
private ProgressDialog progressDialog;
String mCurrentPhotoPath;
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
mCurrentPhotoPath = image.getAbsolutePath();
return image;
}
private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File...
}
// Continue only if the File was successfully created
if (photoFile != null) {
Uri photoURI = FileProvider.getUriForFile(this,
"com.example.android.fileprovider",
photoFile);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(takePictureIntent, CAMERA_REQUEST_CODE);
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonUpload = (Button) findViewById(R.id.buttonUpload);
editTextMessage = (EditText) findViewById(R.id.editTextMessage);
storage = FirebaseStorage.getInstance().getReference();
progressDialog = new ProgressDialog(this);
buttonUpload.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
dispatchTakePictureIntent();
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == CAMERA_REQUEST_CODE && resultCode == RESULT_OK){
progressDialog.setMessage("Uploading...");
progressDialog.show();
Uri uri = data.getData();
StorageReference filepath = storage.child("Photos").child(uri.getLastPathSegment());
filepath.putFile(uri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
Toast.makeText(MainActivity.this, "Upload Successful!", Toast.LENGTH_SHORT).show();
progressDialog.dismiss();
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Toast.makeText(MainActivity.this, "Upload Failed!", Toast.LENGTH_SHORT).show();
}
});
}
}
public void distressMessage(View view){
gps = new TrackGPS(MainActivity.this);
String message = "";
if(view.getId() == R.id.fab){
message = editTextMessage.getText().toString();
}else {
Button sender = (Button) view;
message = sender.getText().toString();
}
SmsManager smsManager = SmsManager.getDefault();
if(gps.canGetLocation()){
longitude = gps.getLongitude();
latitude = gps.getLatitude();
smsManager.sendTextMessage("+639972301925", null, message + "\n\nLongitude:"+Double.toString(longitude)+"\nLatitude:"+Double.toString(latitude), null, null);
Toast.makeText(getApplicationContext(),"Longitude:"+Double.toString(longitude)+"\nLatitude:"+Double.toString(latitude),Toast.LENGTH_SHORT).show();
}
else
{
gps.showSettingsAlert();
}
}
}
这是我的Logcat
java.lang.RuntimeException: Unable to resume activity {com.example.niki.currentlocation/com.example.niki.currentlocation.MainActivity}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {com.example.niki.currentlocation/com.example.niki.currentlocation.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.net.Uri android.content.Intent.getData()' on a null object reference
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2986)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3017)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
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:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {com.example.niki.currentlocation/com.example.niki.currentlocation.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.net.Uri android.content.Intent.getData()' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:3574)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2972)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3017)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
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:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.net.Uri android.content.Intent.getData()' on a null object reference
at com.example.niki.currentlocation.MainActivity.onActivityResult(MainActivity.java:101)
at android.app.Activity.dispatchActivityResult(Activity.java:6192)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3570)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2972)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3017)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
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:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
这就是问题所在。请帮忙
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {com.example.niki.currentlocation/com.example.niki.currentlocation.MainActivity}: java.lang.NullPointerException:
Attempt to invoke virtual method 'android.net.Uri android.content.Intent.getData()' on a null object reference
答案 0 :(得分：0)
未能提供结果ResultInfo {who = null，request = 1，result = -1， data = null }
您正尝试getData()处理不存在的内容。
加入一些，然后弄清楚为什么这段代码没有得到你期望的意图
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == CAMERA_REQUEST_CODE && resultCode == RESULT_OK
&& data != null) {
progressDialog.setMessage("Uploading...");
progressDialog.show();
Uri uri = data.getData();
if (uri != null) {
StorageReference filepath = storage.child("Photos").child(uri.getLastPathSegment());
filepath.putFile(uri).addOnSuccessListener
例如，您在这里总共有三个地方忽略了错误......
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// #1 Error
ex.printStackTrace();
}
if (photoFile != null) {
Uri photoURI = FileProvider.getUriForFile(this,
"com.example.android.fileprovider",
photoFile);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(takePictureIntent, CAMERA_REQUEST_CODE);
} else {// No else ... #2 error
Log.e("Error", "something bad happened");
}
} else { // No else... #3 error
Log.e("Error", "something bad happened");
}