另一活动的访问布局

Question

I made a music player and here is the design snapshot

My app design

design at the bottom is common for all tabs.

here is the xml file for tabhost and common design

<TabHost
    android:id="@android:id/tabhost"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:weightSum="1" >
        <HorizontalScrollView 
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:fillViewport="true"
            android:scrollbars="none"
            >
            <TabWidget
                android:id="@android:id/tabs"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content">
            </TabWidget>
        </HorizontalScrollView>

        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1.00"
            android:divider="@color/list_divider" >

        </FrameLayout>

        <RelativeLayout
            android:id="@+id/Player"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/light_grey"
            android:fadingEdgeLength="5dp"
            android:weightSum="1" >
            <TextView
                android:id="@+id/song_title"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:paddingLeft="5dp"
                android:paddingRight="5dp"
                android:paddingBottom="1dp"
                android:text="@string/all_you_need_is_love"
                />
            <LinearLayout
                android:id="@+id/player_art"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_centerVertical="true"
                android:layout_below="@id/song_title"
                android:paddingTop="5dp"
                android:paddingLeft="5dp"
                android:orientation="vertical" >

                <ImageView
                    android:id="@+id/player_thumbnail"
                    android:layout_width="70dp"
                    android:layout_height="70dp"
                    android:background="@drawable/nocover"
                    android:padding="4dp"
                    android:contentDescription="@string/art_image" />
            </LinearLayout>

            <LinearLayout
                android:id="@+id/seekbar"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical"
                android:layout_toRightOf="@+id/player_art"
                android:layout_alignTop="@+id/player_art"
                android:paddingLeft="5dp"
                >
                <SeekBar
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content" 
                    />
            </LinearLayout>
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:layout_toRightOf="@+id/player_art"
                android:layout_below="@+id/seekbar"
                android:paddingBottom="3dp"
                android:paddingLeft="5dp"
                android:gravity="center_horizontal|center_vertical"
                >
                <ImageButton
                    android:id="@+id/previous"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginRight="10dp"
                    android:padding="2dp"
                    android:scaleType="centerCrop"
                    android:src="@drawable/rsz_previous"
                    android:background="@drawable/custom_button"
                    android:contentDescription="@string/play_button"
                />

                <ImageButton
                    android:id="@+id/play"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="5dp"
                    android:layout_marginRight="5dp"
                    android:padding="2dp"
                    android:scaleType="centerCrop"
                    android:src="@drawable/rsz_play"
                    android:background="@drawable/custom_button"
                    android:contentDescription="@string/play_button"
                />
                <ImageButton
                    android:id="@+id/next"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:src="@drawable/rsz_next"
                    android:layout_marginLeft="10dp"
                    android:padding="2dp"
                    android:scaleType="centerCrop"
                    android:background="@drawable/custom_button"
                    android:contentDescription="@string/play_button"
                />
            </LinearLayout>
        </RelativeLayout>
    </LinearLayout>
</TabHost>

and another xml file is used for showing songs named music_tab.xml

Here is my java file and Allsong contains all songs title

LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
MainView = (ViewGroup) inflater.inflate(R.layout.music, null, false);

SongName = (TextView) MainView.findViewById(R.id.song_title);

SongName.setText(Allsong.get(position));
String prev = SongName.getText();

It does not set the song Title on design but the prev string that is having the value previously set by setText() Method. Please anyone help me.Thanks in advance.

Answer 1

I too have researched on this thing a lot with no result. The conclusion I came upon was that a class can access only those widgets that are present in the layout which it inflates.

Answer 2

As per my Knowledge, This is not possible !

• Say you have WIDGET-A in ClassA
• In order to access WIDGET-A in say ClassB , you have to pass the object from ClassA to ClassB (Eg: using intents) and then manipulate it