I have a problem when launching an activity, I get this error.
E / AndroidRuntime: FATAL EXCEPTION: main Process: jhon.casique.baccus, PID: 2424 java.lang.RuntimeException: Unable to start activity ComponentInfo {jhon.casique.baccus / jhon.casique.baccus.controller.SettingsActivity}: java.lang.NullPointerException at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2195) at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:2245) at android.app.ActivityThread.access $ 800 (ActivityThread.java:135) at android.app.ActivityThread $ H.handleMessage (ActivityThread.java:1196) at android.os.Handler.dispatchMessage (Handler.java:102) at android.os.Looper.loop (Looper.java:136) at android.app.ActivityThread.main (ActivityThread.java:5017) at java.lang.reflect.Method.invokeNative (Native Method) at java.lang.reflect.Method.invoke (Method.java:515) at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:779) at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:595) at dalvik.system.NativeStart.main (Native Method) Caused by: java.lang.NullPointerException at jhon.casique.baccus.controller.SettingsActivity.onCreate (SettingsActivity.java:32) at android.app.Activity.performCreate (Activity.java:5231) at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1087) at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2159) at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:2245) at android.app.ActivityThread.access $ 800 (ActivityThread.java:135) at android.app.ActivityThread $ H.handleMessage (ActivityThread.java:1196) at android.os.Handler.dispatchMessage (Handler.java:102) at android.os.Looper.loop (Looper.java:136) at android.app.ActivityThread.main (ActivityThread.java:5017) at java.lang.reflect.Method.invokeNative (Native Method) at java.lang.reflect.Method.invoke (Method.java:515) at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:779) at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:595) at dalvik.system.NativeStart.main (Native Method) Application terminated.
package jhon.casique.baccus.controller;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RadioGroup;
import jhon.casique.baccus.R;
public class SettingsActivity extends Activity implements View.OnClickListener {
public static final String EXTRA_WINE_IMAGE_SCALE_TYPE = "jhon.casique.baccus.controller.SettingsActivity.EXTRA_WINE_IMAGE_SCALE_TYPE";
//Views
private RadioGroup mRadioGroup = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_settings);
if (getIntent().getSerializableExtra(EXTRA_WINE_IMAGE_SCALE_TYPE).equals(ImageView.ScaleType.FIT_XY)){
mRadioGroup.check(R.id.fit_radio);
}
else if (getIntent().getSerializableExtra(EXTRA_WINE_IMAGE_SCALE_TYPE).equals(ImageView.ScaleType.FIT_CENTER)){
mRadioGroup.check(R.id.center_radio);
}
//Created here because I just need to have the buttons references to respond to events or when the user pressed it
Button cancelButton = (Button) findViewById(R.id.cancel_button);
Button saveButton = (Button) findViewById(R.id.save_button);
cancelButton.setOnClickListener(this);
saveButton.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.cancel_button:
cancelSettings();
break;
case R.id.save_button:
saveSettings();
break;
}
}
private void saveSettings() {
Intent config = new Intent();
if (mRadioGroup.getCheckedRadioButtonId() == R.id.fit_radio) {
config.putExtra(EXTRA_WINE_IMAGE_SCALE_TYPE, ImageView.ScaleType.FIT_XY);
}
else if (mRadioGroup.getCheckedRadioButtonId() == R.id.center_radio) {
config.putExtra(EXTRA_WINE_IMAGE_SCALE_TYPE, ImageView.ScaleType.FIT_CENTER);
}
setResult(RESULT_OK, config);
finish();
}
private void cancelSettings() {
setResult(RESULT_CANCELED);
finish();
}
}
This is my SettingsActivity.java , which is specifically the activity I want to run.
package jhon.casique.baccus.controller;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.RatingBar;
import android.widget.TextView;
import jhon.casique.baccus.R;
import jhon.casique.baccus.model.Wine;
public class WineActivity extends AppCompatActivity {
//Model
private Wine mWine = null;
//Views
private ImageView mWineImage = null;
private TextView mWineNameText = null;
private TextView mWineTypeText = null;
private TextView mWineOriginText = null;
private RatingBar mRatingBar = null;
private TextView mWineCompanyText = null;
private TextView mWineNoteText = null;
private ViewGroup mWineGrapesContainer = null;
private ImageButton mGoToWebButton = null;
private static final int SETTINGS_REQUEST = 1;
private static final String STATE_IMAGE_SCALE_TYPE = "jhon.casique.baccus.controller.WineActivity.STATE_IMAGE_SCALE_TYPE";
private static final String TAG = WineActivity.class.getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_wine);
//Creating model
mWine = new Wine(
"Bembibre",
"Tinto",
R.drawable.bembibre,
"Dominio de Tares",
"http://www.dominiodetares.com/portfolio/bembibre/",
"Este vino muestra toda la complejidad y la elegancia de la variedad Mencía. En fase visual luce un color rojo picota muy cobierto con tonalidades violáceas en el menisco. En nariz aparecen recuerdos frutales muy intensos de frutas rojas (frambuesa, cereza) y una potente ciruela negra asi como tonos florales de la gama de las rosas y violetas, vegetales muy elegantes y complementarios, hojarasca verde, tabaco y maderas aromáticas (sándalo) que le brindan un troque ciertamente perfumado",
"El Bierzo",
5);
mWine.addGrape("Mencía");
//Accessing views from the controller file.
mWineImage = (ImageView) findViewById(R.id.wine_image);
mWineNameText = (TextView) findViewById(R.id.wine_name);
mWineTypeText = (TextView) findViewById(R.id.wine_type);
mWineOriginText = (TextView) findViewById(R.id.wine_origin);
mRatingBar = (RatingBar) findViewById(R.id.wine_rating);
mWineCompanyText = (TextView) findViewById(R.id.wine_company);
mWineNoteText = (TextView) findViewById(R.id.wine_notes);
mWineGrapesContainer = (ViewGroup) findViewById(R.id.grapes_container);
mGoToWebButton = (ImageButton) findViewById(R.id.go_to_web_button);
//Giving value to the views with the model
mWineImage.setImageResource(mWine.getPhoto());
mWineNameText.setText(mWine.getName());
mWineTypeText.setText(mWine.getType());
mWineOriginText.setText(mWine.getOrigin());
mRatingBar.setRating(mWine.getRating());
mWineCompanyText.setText(mWine.getCompanyName());
mWineNoteText.setText(mWine.getNotes());
//List grapes actualization.
for (int i = 0; i < mWine.getGrapeCount(); i++) {
TextView grapeText = new TextView(this);
grapeText.setText(mWine.getGrape(i));
grapeText.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
mWineGrapesContainer.addView(grapeText);
}
//Buttons configuration.
mGoToWebButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent webIntent = new Intent(WineActivity.this, WebActivity.class);
webIntent.putExtra(WebActivity.EXTRA_WINE, mWine);
startActivity(webIntent);
}
});
//Image view configuration.
if (savedInstanceState != null && savedInstanceState.containsKey(STATE_IMAGE_SCALE_TYPE)) {
mWineImage.setScaleType((ImageView.ScaleType) savedInstanceState.getSerializable(STATE_IMAGE_SCALE_TYPE));
}
}
//Methods to create the menu settings image.
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
super.onOptionsItemSelected(item);
if (item.getItemId()== R.id.action_settings) {
Intent settingsIntent = new Intent(this, SettingsActivity.class);
settingsIntent.putExtra(SettingsActivity.EXTRA_WINE_IMAGE_SCALE_TYPE, mWineImage.getScaleType());
startActivityForResult(settingsIntent, SETTINGS_REQUEST);
return true;
}
return false;
}
//Method to create the new activity trow the menu.
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == SETTINGS_REQUEST && resultCode == RESULT_OK) {
ImageView.ScaleType scaleType = (ImageView.ScaleType) data.getSerializableExtra(SettingsActivity.EXTRA_WINE_IMAGE_SCALE_TYPE);
mWineImage.setScaleType(scaleType);
}
}
//Method for maintaining the user option to screen rotated.
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putSerializable(STATE_IMAGE_SCALE_TYPE, mWineImage.getScaleType());
}
}
And this is the screen where I will perform the activity. I think the problem that is in the call action_settings , which is on the line WineActivity 122 .
I understood that there is just a menu in my menu_main.xml with that name, but also in the values file, a file is created, ids.xml , which has the same option. By pressing Crtl + Click directly on the call, it takes me to this file, instead of the one I want the activity to start, when I rename them, I still get an error, so I do not know how to do it .