ZoomControls放大与缩小

package zoom.control; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.TextView; import android.widget.ZoomControls; public class ZoomControlstestActivity extends Activity { private ZoomControls zoomControls; static long size = 12; private TextView text; /* * (non-Javadoc) * * @see android.app.Activity#onCreate(android.os.Bundle) */ @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.main); setTitle("ZoomControls"); zoomControls = (ZoomControls) findViewById(R.id.zoomcontrols); text = (TextView) findViewById(R.id.text); zoomControls.setOnZoomInClickListener(new OnClickListener() { @Override public void onClick(View v) { size = size + 2; text.setTextSize(size); } }); zoomControls.setOnZoomOutClickListener(new OnClickListener() { @Override public void onClick(View v) { size = size - 2; text.setTextSize(size); } }); } }