TA的每日心情 | 开心 2012-3-7 10:15 |
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签到天数: 11 天 [LV.3]偶尔看看II
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用途:动态设置Button、ImageView等组件在不同状态下的背景/前景显示效果。
扩展下的话可以前景/背景的显示效果可以使用网络图片。
优点:灵活,减少xml的编写。
参考:
[AndroidOpenSource]frameworksasecorejavaandroidviewview.xml
[AndroidOpenSource]frameworksasecore
es
esvaluespublic.xml
代码如下: - /** 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;
- }
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示例代码: - Button btnNormal = (Button) findViewById(R.id.btnSampleNormal);
- btnNormal.setBackgroundDrawable(newSelector(this, R.drawable.btn_normal, R.drawable.btn_selected,
- R.drawable.btn_selected, R.drawable.btn_unable));
- Button btnUnable = (Button) findViewById(R.id.btnSampleUnable);
- btnUnable.setBackgroundDrawable(newSelector(this, R.drawable.btn_normal, R.drawable.btn_selected,
- R.drawable.btn_selected, R.drawable.btn_unable));
- btnUnable.setEnabled(false);
- btnUnable.setOnClickListener(this);
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补充内容 (2011-9-23 19:08):
貌似没人懂得这东西的好处,唉...
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