Android programming to implement image enlargement and zoom-out function ZoomControls control usage example

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public class MainActivity extends Activity {
  private LinearLayout llLayout;
  private ZoomControls zoomcontrols;
  private ImageView img;
  private int id=0;
  private int displayWidth;
  private int displayHeight;
  private float scaleWidth = 1;
  private float scaleHeight = 1;
  private Bitmap bitmap;
  @Override
  public void onCreate(Bundle savedInstanceState) {
    (savedInstanceState);
    setContentView(.activity_main);
    llLayout =(LinearLayout)findViewById();
    //Get the screen resolution    DisplayMetrics dm = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(dm);
    displayWidth = ;
    //Screen height minus the height of zoomControls    displayHeight = ;
    bitmap = (getResources(), );
    img =(ImageView)findViewById();
    //();Hide zoomControls    //(); Show zoomCONtrols    zoomcontrols =(ZoomControls)findViewById();
    img =(ImageView)findViewById();
    (true);
    (true);
    //Picture enlargement    (new OnClickListener()
    {
      public void onClick(View v)
      {
        int bmpWidth = ();
        int bmpHeight = ();
        //Set the picture enlargement but the proportion        double scale = 1.25;
        //Calculate the proportion to enlarge this time        scaleWidth =(float)(scaleWidth*scale);
        scaleHeight =(float)(scaleHeight*scale);
        //Generate new size but Bitmap object        Matrix matrix = new Matrix();
        (scaleWidth, scaleHeight);
        Bitmap resizeBmp = (bitmap,0,0,bmpWidth,bmpHeight,matrix,true);
        (resizeBmp);
      }
    });
    //Picture reduction    (new OnClickListener()
    {
      public void onClick(View v) {
        int bmpWidth = ();
        int bmpHeight = ();
        //Set the picture enlargement but the proportion        double scale = 0.8;
        //Calculate the proportion to enlarge this time        scaleWidth =(float)(scaleWidth*scale);
        scaleHeight =(float)(scaleHeight*scale);
        //Generate new size but Bitmap object        Matrix matrix = new Matrix();
        (scaleWidth, scaleHeight);
        Bitmap resizeBmp = (bitmap,0,0,bmpWidth,bmpHeight,matrix,true);
        (resizeBmp);
      }
    });
  }
}

<LinearLayout xmlns:andro
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:
  >
  <ImageView
    android:
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/c"
    />
  <ZoomControls
    android:
    android:layout_gravity="bottom"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    />
  </LinearLayout>