Android详细教程（基础篇）：二十二、View组件高级篇：ZoomControls 缩放控制组件详解

7.18. ZoomControls(缩放控制组件)

 

 

示例：

配置activity_zoom_ctrols.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout             xmlns:android="http://schemas.android.com/apk/res/android"             android:orientation="vertical"             android:layout_width="fill_parent"             android:layout_height="fill_parent">             <TextView                        android:id="@+id/text"                        android:layout_width="wrap_content"                        android:layout_height="wrap_content"                        android:text="杨雄（makyan）"                        android:textSize="10px" />             <ZoomControls                        android:id="@+id/zoomcontrols"                        android:layout_gravity="bottom"                        android:layout_width="wrap_content"                         android:layout_height="wrap_content" /> </LinearLayout>

Activity程序：

package com.makyan.demo; 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 ZoomCtrolsActivity extends Activity {      private ZoomControls zoomControls;                               // 缩放组件      private int size = 10;                                                // 默认文字大小      private TextView text;                                                // 文本显示组件      @Override      public void onCreate(Bundle savedInstanceState) {           super.onCreate(savedInstanceState);           super.setContentView(R.layout.activity_zoom_ctrols); // 调用默认布局           zoomControls = (ZoomControls) findViewById(R.id.zoomcontrols);           text = (TextView) findViewById(R.id.text);             // 取得组件           zoomControls.setOnZoomInClickListener(new OnZoomInClickListenerImpl());     // 设置放大监听           zoomControls.setOnZoomOutClickListener(new OnZoomOutClickListenerImpl());// 设置缩小监听      }      private class OnZoomInClickListenerImpl implements OnClickListener {             @Override           public void onClick(View view) {                size = size + 2;              // 更改文字大小                text.setTextSize(size);       // 更改文字大小           }      }      private class OnZoomOutClickListenerImpl implements OnClickListener {           @Override           public void onClick(View view) {                size = size - 2;              // 更改文字大小                text.setTextSize(size);       // 更改文字大小           }      } }