ImageSwitcher类是ViewSwitcher类的子类,它实现的效果是在完成ImageView的切换并且带有动画效果。要使用这个类需要以下两个步骤:
1)为ImageSwitcher类提供一个ViewFactory,该ViewFactory生成的View组件必须是ImageView。
2)需要切换的时候,只需要嗲用ImageSwitcher的setImageDrawable()、setImageResource()、setImageURL()方法即可实现切换。
activity_main.xml:
<LinearLayout xmlns:android=\"http://schemas.android.com/apk/res/android\" xmlns:tools=\"http://schemas.android.com/tools\" android:layout_width=\"match_parent\" android:layout_height=\"match_parent\" android:orientation=\"vertical\" tools:context=\".MainActivity\" > <ImageSwitcher android:id=\"@+id/imageswitcher\" android:layout_width=\"200dp\" android:layout_height=\"200dp\" android:layout_gravity=\"center_horizontal\" /> <RelativeLayout android:layout_width=\"match_parent\" android:layout_height=\"match_parent\" android:orientation=\"horizontal\" > <Button android:id=\"@+id/back\" android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:layout_alignParentLeft=\"true\" android:text=\"back\" /> <Button android:id=\"@+id/forward\" android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:layout_alignParentRight=\"true\" android:text=\"forward\" /> </RelativeLayout> </LinearLayout>
Main_activity.java:
package com.example.android_imageswitcher1; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageSwitcher; import android.widget.ImageView; import android.widget.ViewSwitcher.ViewFactory; public class MainActivity extends Activity implements ViewFactory, OnClickListener { ImageSwitcher mImageSwitcher = null; Button btn1, btn2; int index = 0; int[] resId = new int[9]; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mImageSwitcher = (ImageSwitcher) this.findViewById(R.id.imageswitcher); btn1 = (Button) this.findViewById(R.id.back); btn2 = (Button) this.findViewById(R.id.forward); btn1.setOnClickListener(this); btn2.setOnClickListener(this); mImageSwitcher.setFactory(this); mImageSwitcher.setInAnimation(this, android.R.anim.slide_in_left); mImageSwitcher.setOutAnimation(this, android.R.anim.slide_out_right); initResources(); if (resId.length > 0) { mImageSwitcher.setImageResource(resId[0]); } } public void initResources() { resId[0] = R.drawable.adobe; resId[1] = R.drawable.android; resId[2] = R.drawable.circle; resId[3] = R.drawable.digg; resId[4] = R.drawable.flower; resId[5] = R.drawable.gmail; resId[6] = R.drawable.imdb; resId[7] = R.drawable.photo; resId[8] = R.drawable.point; } @Override public View makeView() { return new ImageView(MainActivity.this); } @Override public void onClick(View view) { int action = view.getId(); switch (action) { case R.id.back: index--; if (index < 0) { index = resId.length - 1; } mImageSwitcher.setImageResource(resId[index]); break; case R.id.forward: index++; if (index > resId.length - 1) { index = 0; } mImageSwitcher.setImageResource(resId[index]); break; default: break; } } }
实现的效果如下:
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