Question

I am just trying to write a MenuInflate. when user clicks to AboutUs button a small dialog box should appear and write what I want to. But somehow it writes MainActivity instead of “About us About us”

public boolean onOptionsItemSelected(MenuItem item) {

            switch (item.getItemId()) {
            case R.id.aboutUs:
                Intent i = new Intent("com.android.ABOUT");
                finish();
                startActivity(i);
                break;
            case R.id.preferences:
                break;
            }

            return false;
        }

this is my about.xml file

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="About me About Me" >
        </TextView>
    >

    </LinearLayout>

and related part of AndroidManifest.xml

 <activity
            android:name=".AboutUs"
            android:exported="false"
            android:label="@string/title_activity_main"
            android:theme="@android:style/Theme.Dialog" >
            <intent-filter>
                <action android:name="com.android.ABOUT" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

Answer 1

If setContentView(R.layout.my_layout_file) isn’t included in the onCreate() method then Android doesn’t know what View to display resulting in nothing to display in the Activity. This also will keep the Activity from being able to instantiate any Views such as TextViews, EditTexts, Buttons, etc.

http://developer.android.com/reference/android/app/Activity.html#setContentView(android.view.View)