I have two android activities with one single button on both.
The activity DetailsActivity is my MAIN activity.
public class DetailsActivity extends Activity {
@Override
public void onCreate(Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.details_activity_layout);
}
@Override
public void onResume() {
super.onResume();
}
public void gotoSubDetails(View view) {
Intent intent = new Intent(this, SubDetailsActivity.class);
startActivity(intent);
finish();
}
}
And my SubDetailsActivity is as follows:
public class SubDetailsActivity extends Activity {
@Override
public void onCreate(Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.sub_details_activity_layout);
}
@Override
public void onResume() {
super.onResume();
}
public void gotoDetails(View view) {
Intent intent = new Intent(this, DetailsActivity.class);
startActivity(intent); // Restarting the finish()ed activity here.
finish();
}
}
And this is how I mentioned my button in details_activity_layout.xml for DetailsActivity.java:
<Button android:id="@+id/details_submit"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/to_sub_details"
android:onClick="gotoSubDetails" />
And this is how I have mentioned my button in sub_details_activity_layout.xml for SubDetailsActivity.java:
<Button android:id="@+id/sub_details_submit"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/back_to_details"
android:onClick="gotoDetails" />
These are my both activities in AndroidManifest.xml:
<activity android:name="DetailsActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="SubDetailsActivity">
</activity>
When I click the button in DetailsActivity, the activity finish()es properly and SubDetailsActivity starts up.
But when I click the button in SubDetailsActivity to get back to the finish()ed DetailsActivity, the app straight away crashes on my LG L90 phone.
Where am I going wrong? Any help? Please.
PS:
I cannot post the log cat report as I did not test it on my mac but directly on my phone. I don't have an emulator. I am compiling the code on my terminal and transferring the .apk file on my phone via bluetooth.
EDIT: Ok guys. Now this is really funny!
I removed the
android:onClick="gotoSubDetails"
and
android:onClick="gotoDetails"
from my details_activity_layout.xml and sub_details_activity_layout.xml respectively. And I loaded the android.widget.Button's in my DetailsActivity.java and SubDetailsActivity.java and added an android.view.View.OnClickListener on both of them and overrode the onClick(View) method.
This is what I did in my DetailsActivity.java:
public class DetailsActivity extends Activity {
@Override
public void onCreate(Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.details_activity_layout);
Button button = (Button)findViewById(R.id.details_submit);
button.setOnClickListener(new DetailsSubmitListener());
}
@Override
public void onResume() {
super.onResume();
}
public class DetailsSubmitListener implements OnClickListener {
@Override
public void onClick(View view) {
Intent intent = new Intent(this, SubDetailsActivity.class);
startActivity(intent);
finish();
}
}
}
And this is what I did in my SubDetailsActivity.java class:
public class SubDetailsActivity extends Activity {
@Override
public void onCreate(Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.details_activity_layout);
Button button = (Button)findViewById(R.id.sub_details_submit);
button.setOnClickListener(new SubDetailsSubmitListener());
}
@Override
public void onResume() {
super.onResume();
}
public class SubDetailsSubmitListener implements OnClickListener {
@Override
public void onClick(View view) {
Intent intent = new Intent(this, DetailsActivity.class);
startActivity(intent);
finish();
}
}
}
And this miraculously worked fine.
So what was the problem with the .xml attributes in my layout files? And how different is it from the hardcoded listener in my .java file? This thing has confused me. finish()ed activities can be re-started. Thats what I discovered with my change in the program. Please shed some light of knowledge on this.
