Android控件之-ImageSwitcher

最新推荐文章于 2024-04-01 04:01:54 发布

原创最新推荐文章于 2024-04-01 04:01:54 发布 · 199 阅读

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#Android #UP #OS

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本文介绍了一个简单的Android应用程序，该程序能够通过按钮操作实现图片的前后切换功能。应用中使用了ImageSwitcher组件，并定义了一个包含多张图片资源的数组，通过点击NEXT和UP按钮，可以在这些图片之间进行切换。

切换图片，在Android手机应用中也经常使用：

package com.ko8e;

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.LinearLayout;
import android.widget.ViewSwitcher.ViewFactory;

public class MyActivity extends Activity implements OnClickListener,
		ViewFactory {
	/** Called when the activity is first created. */

	private LinearLayout linear = null;
	private ImageSwitcher imageSwitcher = null;
	private int[] imageList = { R.drawable.img1, R.drawable.img2,
			R.drawable.img3, R.drawable.img4, R.drawable.img5, R.drawable.img6,
			R.drawable.img7, R.drawable.img8, };
	private static int index = 0;
	private static final int BUTTON_DOWN_ID = 0x123456;
	private static final int BUTTON_UP_ID = 0x123457;
	private static final int BUTTON_SWITCHER_ID = 0x123458;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		linear = new LinearLayout(this);
		imageSwitcher = new ImageSwitcher(this);
		linear.addView(imageSwitcher);

		imageSwitcher.setId(BUTTON_SWITCHER_ID);
		imageSwitcher.setFactory(this);
		imageSwitcher.setImageResource(imageList[index]);
		// 顯示上面的佈局
		setContentView(linear);

		Button next = new Button(this);
		next.setId(BUTTON_DOWN_ID);
		next.setText("NEXT");
		next.setOnClickListener(this);
		LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(100,
				100);
		linear.addView(next, param);

		Button pre = new Button(this);
		pre.setId(BUTTON_UP_ID);
		pre.setText("UP");
		pre.setOnClickListener(this);
		linear.addView(pre, param);
	}

	public void onClick(View v) {
		switch (v.getId()) {
		case BUTTON_DOWN_ID:
			index++;
			if (index >= imageList.length) {
				index = 0;
			}
			imageSwitcher.setImageResource(imageList[index]);
			break;
		case BUTTON_UP_ID:
			index--;
			if (index < 0) {
				index = imageList.length - 1;
			}
			imageSwitcher.setImageResource(imageList[index]);
			break;
		}
	}

	public View makeView() {
		return new ImageView(this);
	}
}