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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