8.给TextView及其子类设置图片

最新推荐文章于 2018-07-14 20:51:49 发布

原创最新推荐文章于 2018-07-14 20:51:49 发布 · 304 阅读

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本文介绍了一种在Android应用中根据设备管理器的状态切换按钮图标的方法。通过使用自定义工具类ImageTextViewUtils，可以根据设备是否激活来改变按钮的显示图标。

private void initState() {
		if (mDpm.isAdminActive(mWho)) {
			ImageTextViewUtils.setTextViewImage(this, btnAdmin,
					R.drawable.admin_activated, ImageTextViewUtils.RIGHT);
		} else {
			ImageTextViewUtils.setTextViewImage(this, btnAdmin,
					R.drawable.admin_inactivated, ImageTextViewUtils.RIGHT);
		}
	}

package org.heima.mobilesafe01.utils;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.widget.TextView;

public class ImageTextViewUtils {
	public static final int LEFT = 1 << 0;
	public static final int RIGHT = 1 << 1;
	public static final int BOTTOM = 1 << 2;
	public static final int TOP = 1 << 3;

	public static void setTextViewImage(Context context, TextView tv,
			int imgId, int or) {
		Drawable d = context.getResources().getDrawable(imgId);
		setTextViewImage(context, tv, d, or);
	}

	public static void setTextViewImage(Context context, TextView tv,
			Drawable d, int or) {
		if (d == null) {
			throw new IllegalArgumentException("drawable can not be null");
		}
		d.setBounds(0, 0, d.getMinimumWidth(), d.getMinimumHeight());
		switch (or) {
		case LEFT:
			tv.setCompoundDrawables(d, null, null, null);
			break;
		case RIGHT:
			tv.setCompoundDrawables(null, null, d, null);
			break;
		case BOTTOM:
			tv.setCompoundDrawables(null, null, null, d);
			break;
		case TOP:
			tv.setCompoundDrawables(null, d, null, null);
			break;

		default:
			break;
		}
	}
}