[Android]代码实现ColorStateList及StateListDrawable

点：灵活，减少xml的编写。应用在TextView的文字时，亦避免使用了OnTouchListener。

用途：动态设置TextView、Button、ImageView等组件在不同状态下的背景/前景显示效果。

参考：

[AndroidOpenSource]\frameworks\base\core\java\android\view\view.xml

[AndroidOpenSource]\frameworks\base\core\res\res\values\public.xml

效果图如下：

[Android]代码实现ColorStateList及StateListDrawable_第1张图片

代码如下：

package lab.sodino.statelist;import android.app.Activity;import android.content.Context;import android.content.res.ColorStateList;import android.graphics.drawable.Drawable;import android.graphics.drawable.StateListDrawable;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.TextView;/** * 对TextView设置ColorStateList使其在Normal、Pressed、Focused、Unable四种状态下显示不同的颜色。<br/> * StateListDrawable可直接使用图片应用在相似场合。 */public class ActColorStateList extends Activity implements OnClickListener {private TextView txtShow;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);txtShow = (TextView) findViewById(R.id.txtShow);txtShow.setText("Sodino\nNormal:0xffffffff\nPressed:0xffffff00\nFocused:0xff0000ff\nUnable:0xffff0000");txtShow.setTextColor(createColorStateList(0xffffffff, 0xffffff00, 0xff0000ff, 0xffff0000));txtShow.setOnClickListener(this);}/** 对TextView设置不同状态时其文字颜色。 */private ColorStateList createColorStateList(int normal, int pressed, int focused, int unable) {int[] colors = new int[] { pressed, focused, normal, focused, unable, normal };int[][] states = new int[6][];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[] {};ColorStateList colorList = new ColorStateList(states, colors);return colorList;}/** 设置Selector。 */public static StateListDrawable newSelector(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;}@Overridepublic void onClick(View v) {if (v == txtShow) {txtShow.setEnabled(false);}}}

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