ApiDemos Clean up

- Add missing @Override
- Remove (some) unused imports
- Add some missing headers

BUG: 2031807

samples/ApiDemos/src/com/example/android/apis/view/BaselineNested1.java

@@ -20,8 +20,6 @@ import com.example.android.apis.R;
 
 import android.app.Activity;
 import android.os.Bundle;
-import android.widget.LinearLayout;
-import android.widget.TextView;
 
 /**
  * Baseline alignment includes elements within nested vertical
@@ -29,7 +27,7 @@ import android.widget.TextView;
  */
 public class BaselineNested1 extends Activity {
 
-
+    @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 

samples/ApiDemos/src/com/example/android/apis/view/BaselineNested2.java

@@ -20,8 +20,6 @@ import com.example.android.apis.R;
 
 import android.app.Activity;
 import android.os.Bundle;
-import android.widget.LinearLayout;
-import android.widget.TextView;
 
 /**
  * Baseline alignment includes an element within a nested horizontal
@@ -29,7 +27,7 @@ import android.widget.TextView;
  */
 public class BaselineNested2 extends Activity {
 
-
+    @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 

samples/ApiDemos/src/com/example/android/apis/view/BaselineNested3.java

@@ -20,8 +20,6 @@ import com.example.android.apis.R;
 
 import android.app.Activity;
 import android.os.Bundle;
-import android.widget.LinearLayout;
-import android.widget.TextView;
 
 /**
  * Baseline alignment includes a {@link android.widget.LinearLayout}
@@ -29,7 +27,7 @@ import android.widget.TextView;
  */
 public class BaselineNested3 extends Activity {
 
-
+    @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 

samples/ApiDemos/src/com/example/android/apis/view/Focus2.java

@@ -23,6 +23,7 @@ import android.os.Bundle;
 
 public class Focus2 extends Activity {
 
+    @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 

samples/ApiDemos/src/com/example/android/apis/view/Focus3.java

@@ -25,6 +25,7 @@ public class Focus3 extends Activity {
     private Button mTopButton;
     private Button mBottomButton;
 
+    @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 

samples/ApiDemos/src/com/example/android/apis/view/InternalSelectionView.java

@@ -199,6 +199,7 @@ public class InternalSelectionView extends View {
     /* (non-Javadoc)
     * @see android.view.KeyEvent.Callback#onKeyDown(int, android.view.KeyEvent)
     */
+    @Override
     public boolean onKeyDown(int keyCode, KeyEvent event) {
         switch(event.getKeyCode()) {
             case KeyEvent.KEYCODE_DPAD_UP:

samples/ApiDemos/src/com/example/android/apis/view/LayoutAnimation2.java

@@ -17,7 +17,6 @@
 package com.example.android.apis.view;
 
 import android.app.ListActivity;
-import android.content.Context;
 import android.os.Bundle;
 import android.view.animation.AlphaAnimation;
 import android.view.animation.Animation;

samples/ApiDemos/src/com/example/android/apis/view/LayoutAnimation3.java

@@ -21,8 +21,6 @@ import com.example.android.apis.R;
 import android.app.ListActivity;
 import android.os.Bundle;
 import android.widget.ArrayAdapter;
-import android.widget.ListView;
-import android.view.View;
 
 public class LayoutAnimation3 extends ListActivity {
     @Override

samples/ApiDemos/src/com/example/android/apis/view/LayoutAnimation5.java

@@ -25,7 +25,6 @@ import android.os.Bundle;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
-import android.widget.Gallery;
 import android.widget.GridView;
 import android.widget.ImageView;
 

samples/ApiDemos/src/com/example/android/apis/view/LayoutAnimation7.java

@@ -19,20 +19,7 @@ package com.example.android.apis.view;
 import com.example.android.apis.R;
 
 import android.app.Activity;
-import android.content.Intent;
-import android.content.pm.PackageManager;
 import android.os.Bundle;
-import android.view.View;
-import android.view.ViewGroup;
-import android.view.animation.AlphaAnimation;
-import android.view.animation.Animation;
-import android.view.animation.GridLayoutAnimationController;
-import android.widget.BaseAdapter;
-import android.widget.Gallery;
-import android.widget.GridView;
-import android.widget.ImageView;
-
-import java.util.List;
 
 public class LayoutAnimation7 extends Activity {
     @Override

samples/ApiDemos/src/com/example/android/apis/view/List5.java

@@ -49,10 +49,12 @@ public class List5 extends ListActivity {
             return mStrings.length;
         }
 
+        @Override
         public boolean areAllItemsEnabled() {
             return false;
         }
 
+        @Override
         public boolean isEnabled(int position) {
             return !mStrings[position].startsWith("-");
         }