在main.xml中
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:gravity="center_horizontal">
<TextView
android:id="@+id/text"
android:layout_marginTop="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"
android:text="不积跬步无以至千里" />
<ZoomControls
android:id="@+id/zoomcontrols"
android:layout_marginTop="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="bottom"/>
</LinearLayout>
在MyZoomControlsDemo.java程序中
package com.li.zoomcontrols;
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 MyZoomControlsDemo extends Activity {
private TextView text = null;
private ZoomControls zoomControls = null;
private int size = 20; //保存文字大小的变量
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
this.text = (TextView)super.findViewById(R.id.text);
this.zoomControls = (ZoomControls)super.findViewById(R.id.zoomcontrols);
this.zoomControls.setOnZoomInClickListener(new OnZoomInClickListenerImpl());
this.zoomControls.setOnZoomOutClickListener(new OnZoomOutClickListenerImpl());
}
private class OnZoomInClickListenerImpl implements OnClickListener{
public void onClick(View v) {
MyZoomControlsDemo.this.size = size + 2;
MyZoomControlsDemo.this.text.setTextSize(size);
}
}
private class OnZoomOutClickListenerImpl implements OnClickListener{
public void onClick(View v) {
MyZoomControlsDemo.this.size = size - 2;
MyZoomControlsDemo.this.text.setTextSize(size);
}
}
}