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;{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_SETbg.addState(new int[] { android.R.attr.state_pressed,android.R.attr.state_enabled }, pressed);// View.ENABLED_FOCUSED_STATE_SETbg.addState(new int[] { android.R.attr.state_enabled,android.R.attr.state_focused }, focused);// View.ENABLED_STATE_SETbg.addState(new int[] { android.R.attr.state_enabled }, normal);// View.FOCUSED_STATE_SETbg.addState(new int[] { android.R.attr.state_focused }, focused);// View.WINDOW_FOCUSED_STATE_SETbg.addState(new int[] { android.R.attr.state_window_focused }, unable);// View.EMPTY_STATE_SETbg.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);
哪里有意志存在，哪里就会有出路。
