Paulo Roberto Paulo Roberto - 5 months ago 18
Android Question

call another activity after the click on the menu

I have a menu and want to call the next activity , so that the user can calculate and then want to return the next page or the home page , but do not know how to do this ... Ja tried in many ways , but not the right or when it works on another page disappear all anetriores menus , leaving you stuck only that activity.

I am new to programming and especially on android.

MainActivity:

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();

if (id == R.id.nav_camera) {
//I want to call the page " calculations" here.

} else if (id == R.id.nav_gallery) {

}

DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}


android_manifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.stark.hello_world">

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".Splashscreen"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

<activity
android:name=".Calculos"
android:label="@string/action_help"
android:parentActivityName=".MainActivity" />

</application>

</manifest>


calculos.xml

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="4dp"
android:paddingRight="4dp"
android:paddingTop="4dp"
android:paddingBottom="4dp"
tools:context=".MainActivity"
android:background="#ff0fffab">


<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="SEM"
android:id="@+id/textView"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:textSize="@dimen/abc_text_size_display_3_material"
android:textColor="#ffffffff" />

<EditText
android:id="@+id/email_address"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:inputType="number" />
</RelativeLayout>


app

Answer

I'm not sure about your question but I guess you want to open a new Activity after a menu item was clicked?

For this you need to start an Intent in your if - I've added the line you need to your code

public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    int id = item.getItemId();

    if (id == R.id.nav_camera) {
        //I want to call the page " calculations" here.
        //with this code you can call a new activity
        Intent intent = new Intent(this, YourActivity.class);
        startActivity(intent);
    } else if (id == R.id.nav_gallery) {
        //create another Intent here and navigate to the correct activity
}

But I would suggest to use Fragments instead of Activities and use getFragmentManager().beginTransaction().replace(YourFragment.newInstance());