JAVA代码设置selector

最新推荐文章于 2021-04-28 20:37:35 发布

最新推荐文章于 2021-04-28 20:37:35 发布 · 853 阅读

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#android #java #selector button

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本文介绍了一个用于Android应用程序中实现按钮或其他UI元素不同状态切换的方法，包括正常、按下、聚焦及不可用状态，并提供了图片资源和文字颜色状态切换的具体实现。

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/**
     * 设置图片的selector
     * 
     * @param context
     * @param idNormal
     * @param idPressed
     * @param idFocused
     * @param idUnable
     * @return
     */
    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;
    }

用法：btn.setBackgroundDrawable(newSelector(this, R.drawable.btn_normal, R.drawable.btn_selected,
<span style="white-space:pre">	</span>                                R.drawable.btn_selected, R.drawable.btn_unable));

<pre name="code" class="html">/**
	 * 设置不同状态时其文字颜色 
	 * @param normal
	 * @param pressed
	 * @param focused
	 * @param unable
	 * @return
	 */
    private ColorStateList createColorStateList(int normal, int pressed, int cheched, int focused, int unable) {
        int[] colors = new int[] { pressed, cheched, focused, normal, focused, unable, 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_checked, android.R.attr.state_enabled };
        states[2] = new int[] { android.R.attr.state_enabled, android.R.attr.state_focused };
        states[3] = new int[] { android.R.attr.state_enabled };
        states[4] = new int[] { android.R.attr.state_focused };
        states[5] = new int[] { android.R.attr.state_window_focused };
        states[6] = new int[] {};
        ColorStateList colorList = new ColorStateList(states, colors);
        return colorList;
    }

用法：radioButton.setTextColor(createColorStateList(Color.BLACK, Color.RED, Color.RED, Color.RED, Color.BLACK));