缩放控件ZoomControls使用

ZoomControls组件介绍:

通过使用缩放控制zooncontrols，可以实现组件的放大和缩小的功能。实现对控件的控制。主要使用andorid.widget.ZoomControls组件完成.该组件继承android.widget.LinearLayout.

常用操作方法:







step1.在main.xml中添加如下代码

<?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" >

<TextView

android:id="@+id/text"



android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="QQ的末日到了 " />

<ZoomControls

android:id="@+id/zoomControls"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:gravity="bottom"

/>

</LinearLayout>



step2.在activity中编写如下代码

package com.activty;

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;

/**

* 缩放 控制zooncontrols 控制显示文字的大小

* @author Administrator

*

*/

public class ZoomControlsProjectActivity extends Activity {

/** Called when the activity is first created. */

private ZoomControls zoomControls=null;

private TextView textView=null;

private int size=0;//保存字体大小

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

this.zoomControls=(ZoomControls) findViewById(R.id.zoomControls);

this.textView=(TextView) findViewById(R.id.text);

this.zoomControls.setOnZoomInClickListener(new OnZoomInClickListenerImpl());

this.zoomControls.setOnZoomOutClickListener(new OnZoomOutClickListenerImpl());

}

private class OnZoomInClickListenerImpl implements OnClickListener{

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

ZoomControlsProjectActivity.this.size=size+2;

ZoomControlsProjectActivity.this.textView.setTextSize(size);



}



}

private class OnZoomOutClickListenerImpl implements OnClickListener{

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

ZoomControlsProjectActivity.this.size=size-2;

ZoomControlsProjectActivity.this.textView.setTextSize(size);

}



}



}