[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：



代码如下：

[java] view
plaincopy

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_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;

}

@Override

public void onClick(View v) {

if (v == txtShow) {

txtShow.setEnabled(false);

}

}

}