SelectorHepler工具类

一般需要点击效果或者选中、焦点的状态改变后也改变效果的话，需要在drawable文件夹下面新建一个xml文件，然后写一个selector。相对来说比较麻烦，所以我写了一个用代码快速建一个selector的工具类。

SelectorHepler代码：

import android.content.Context;
import android.content.res.ColorStateList;
import android.graphics.drawable.AnimationDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.InsetDrawable;
import android.graphics.drawable.LayerDrawable;
import android.graphics.drawable.StateListDrawable;

public class SelectorHepler {
    private static SelectorHepler util;

    public static SelectorHepler getInstance() {

        if (util == null) {
            util = new SelectorHepler();

        }
        return util;

    }

    private SelectorHepler() {
        super();
    }

    /**
     * 传入Drawable的id，得到一个Selector,一般给setBackgroundDrawable使用
     * @param context
     * @param idNormal
     * @param idPressed
     * @param idFocused
     * @param idUnable
     * @return
     */
    public StateListDrawable getSelectorDrawable(Context context, int idNormal,
            int idPressed, int idFocused, int idUnable) {
        StateListDrawable bg = new StateListDrawable();
        Drawable normal = idNormal == -1 ? null : context.getResources()
                .getDrawable(idNormal);
        Drawable pressed = idPressed == -1 ? null : context.getResources()
                .getDrawable(idPressed);
        Drawable focused = idFocused == -1 ? null : context.getResources()
                .getDrawable(idFocused);
        Drawable unable = idUnable == -1 ? null : context.getResources()
                .getDrawable(idUnable);
        // View.PRESSED_ENABLED_STATE_SET
        bg.addState(new int[] { android.R.attr.state_pressed,
                android.R.attr.state_enabled }, pressed);
        // View.ENABLED_FOCUSED_STATE_SET
        bg.addState(new int[] { android.R.attr.state_enabled,
                android.R.attr.state_focused }, focused);
        // View.ENABLED_STATE_SET
        bg.addState(new int[] { android.R.attr.state_enabled }, normal);
        // View.FOCUSED_STATE_SET
        bg.addState(new int[] { android.R.attr.state_focused }, focused);
        // View.WINDOW_FOCUSED_STATE_SET
        bg.addState(new int[] { android.R.attr.state_window_focused }, unable);
        // View.EMPTY_STATE_SET
        bg.addState(new int[] {}, normal);
        return bg;
    }

    /**
     * 得到点击改变状态的Selector,一般给setBackgroundDrawable使用
     * @param context
     * @param idNormal
     * @param idPressed
     * @return
     */
    public StateListDrawable getPressedSelectorDrawable(Context context, int idNormal,
            int idPressed) {

        Drawable normal = idNormal == -1 ? null : context.getResources()
                .getDrawable(idNormal);
        Drawable pressed = idPressed == -1 ? null : context.getResources()
                .getDrawable(idPressed);

        StateListDrawable bg = getPressedSelectorDrawable( normal, pressed);
        return bg;
    }



    /**
     * 得到点击改变状态的Selector,一般给setBackgroundDrawable使用
     * @param normal
     * @param pressed
     * @return
     */
    public StateListDrawable getPressedSelectorDrawable(
            Drawable normal, Drawable pressed) {
        StateListDrawable bg = new StateListDrawable();

        bg.addState(new int[] { android.R.attr.state_pressed,
                android.R.attr.state_enabled }, pressed);

        bg.addState(new int[] { android.R.attr.state_enabled }, normal);

        bg.addState(new int[] {}, normal);
        return bg;
    }

    /**得到选中改变状态的Selector,一般给setBackgroundDrawable使用
     * @param context
     * @param idNormal
     * @param idchecked
     * @return
     */
    public StateListDrawable getCheckedSelectorDrawable(Context context, int idNormal,
            int idchecked) {

        Drawable normal = idNormal == -1 ? null : context.getResources()
                .getDrawable(idNormal);
        Drawable checked = idchecked == -1 ? null : context.getResources()
                .getDrawable(idchecked);

        StateListDrawable bg = getCheckedSelectorDrawable(normal, checked);
        return bg;
    }

    /**
     * 得到选中改变状态的Selector,一般给setBackgroundDrawable使用
     * @param normal
     * @param checked
     * @return
     */
    public StateListDrawable getCheckedSelectorDrawable(
            Drawable normal, Drawable checked) {
        StateListDrawable bg = new StateListDrawable();

        bg.addState(new int[] { android.R.attr.state_checked,
                android.R.attr.state_enabled }, checked);

        bg.addState(new int[] { android.R.attr.state_enabled }, normal);

        bg.addState(new int[] {}, normal);
        return bg;
    }

    /**
     * 得到焦点改变即改变状态的Selector,一般给setBackgroundDrawable使用
     * @param context
     * @param idNormal
     * @param idchecked
     * @return
     */
    public StateListDrawable getFocusedSelectorDrawable(Context context, int idNormal,
            int idchecked) {

        Drawable normal = idNormal == -1 ? null : context.getResources()
                .getDrawable(idNormal);
        Drawable checked = idchecked == -1 ? null : context.getResources()
                .getDrawable(idchecked);

        StateListDrawable bg = getFocusedSelectorDrawable(normal, checked);
        return bg;
    }

    /**
     * 得到焦点改变即改变状态的Selector,一般给setBackgroundDrawable使用
     * @param normal
     * @param focused
     * @return
     */
    public StateListDrawable getFocusedSelectorDrawable(
            Drawable normal, Drawable focused) {
        StateListDrawable bg = new StateListDrawable();

        bg.addState(new int[] { android.R.attr.state_enabled,
                android.R.attr.state_focused }, focused);
        bg.addState(new int[] { android.R.attr.state_focused }, focused);
        bg.addState(new int[] { android.R.attr.state_enabled }, normal);

        bg.addState(new int[] {}, normal);
        return bg;
    }

    /**
     * 得到可以改变状态的Selector,一般给setTextColor使用
     * @param normal
     * @param pressed
     * @param focused
     * @param unable
     * @param checked
     * @return
     */
    public ColorStateList getColorStateList(int normal, int pressed,
            int focused, int unable, int checked) {
        int[] colors = new int[] { pressed, focused, normal, focused, unable,
                checked, normal };
        int[][] states = new int[7][];
        states[0] = new int[] { android.R.attr.state_pressed,
                android.R.attr.state_enabled };
        states[1] = new int[] { android.R.attr.state_enabled,
                android.R.attr.state_focused };
        states[2] = new int[] { android.R.attr.state_enabled };
        states[3] = new int[] { android.R.attr.state_focused };
        states[4] = new int[] { android.R.attr.state_window_focused };
        states[5] = new int[] { android.R.attr.state_checked,
                android.R.attr.state_enabled };
        states[6] = new int[] {};
        ColorStateList colorList = new ColorStateList(states, colors);
        return colorList;
    }

    /**
     * 得到点击改变状态的Selector,一般给setTextColor使用
     * @param normal
     * @param pressed
     * @return
     */
    public ColorStateList getPressedSelectorColor(int normal, int pressed) {
        int[] colors = new int[] { pressed, normal, normal };
        int[][] states = new int[3][];
        states[0] = new int[] { android.R.attr.state_pressed,
                android.R.attr.state_enabled };
        states[1] = new int[] { android.R.attr.state_enabled };
        states[2] = new int[] {};
        ColorStateList colorList = new ColorStateList(states, colors);
        return colorList;
    }

    /**
     * 得到选中改变状态的Selector,一般给setTextColor使用
     * @param normal
     * @param pressed
     * @return
     */
    public ColorStateList getCheckedSelectorColor(int normal, int pressed) {
        int[] colors = new int[] { pressed, normal, normal };
        int[][] states = new int[3][];
        states[0] = new int[] { android.R.attr.state_checked,
                android.R.attr.state_enabled };
        states[1] = new int[] { android.R.attr.state_enabled };
        states[2] = new int[] {};
        ColorStateList colorList = new ColorStateList(states, colors);
        return colorList;
    }

    /**
     * 将多张图片合并生成一个Drawable
     * @param down
     * @param up
     * @return
     */
    public LayerDrawable getLayerDrawable(Drawable down, Drawable up) {
        Drawable[] layerList = { new InsetDrawable(down, 0, 0, 0, 0),
                new InsetDrawable(up, 0, 0, 0, 0) };

        return new LayerDrawable(layerList);
    }

    /**
     * 将多张图片生成一个连续播放的Drawable动画
     * @param time
     * @param dr
     * @return
     */
    public AnimationDrawable getAnimationDrawable(int time, Drawable... dr) {
        AnimationDrawable animationDrawable = new AnimationDrawable();
        for (int i = 0; i < dr.length; i++) {
            animationDrawable.addFrame(dr[i], time);
        }
         animationDrawable.setOneShot(false);
            animationDrawable.start();
        return animationDrawable;
    }

}

使用方法：

ColorStateList color = SelectorHepler.getInstance()
                .getPressedSelectorColor(Color.WHITE, Color.BLUE);
        StateListDrawable drawable = SelectorHepler.getInstance()
                .getPressedSelectorDrawable(this, R.drawable.ic_normal,
                        R.drawable.ic_pressed);
        tv.setTextColor(color);
        tv.setBackgroundDrawable(drawable);