Android自定义Dialog的Match_parent无效问题解决
Android 开发过程中,自定义dialog 用得很多,通常都是通过继承Dialog, 再加载自定义的xml来实现。
//自定义Dialogpublic class OrderFilterDialog extends Dialog { public OrderFilterDialog(Context context) { super(context); initView(this); } public OrderFilterDialog(Context context, int themeResId) { super(context, themeResId); initView(this); } public void initView(Dialog dialog) { dialog.requestWindowFeature(Window.FEATURE_NO_TITLE); dialog.setContentView(R.layout.dialog_search_order); show(); dialog.setCancelable(false); Window window = dialog.getWindow(); WindowManager.LayoutParams lp = window.getAttributes(); lp.width = WindowManager.LayoutParams.MATCH_PARENT; lp.height = WindowManager.LayoutParams.WRAP_CONTENT; lp.gravity = Gravity.TOP; window.setAttributes(lp); window.setWindowAnimations(R.style.DialogInOutTopAnimation); }}
运行后,发现效果如下,
我们发现,match_parent属性根本没有生效。查看Dialog源码才发现,默认Dialog是有一个theme属性的,坑。
Dialog部分代码如下,
/**140 * Creates a dialog window that uses the default dialog theme.141 * 142 * The supplied {@code context} is used to obtain the window manager and143 * base theme used to present the dialog.144 *145 * @param context the context in which the dialog should run146 * @see android.R.styleable#Theme_dialogTheme147 */
148 public Dialog(@NonNull Context context) {149 this(context, 0, true); //默认传入0150 }151152 /**153 * Creates a dialog window that uses a custom dialog style.154 * 155 * The supplied {@code context} is used to obtain the window manager and156 * base theme used to present the dialog.157 *
158 * The supplied {@code theme} is applied on top of the context's theme. See159 * 160 * Style and Theme Resources for more information about defining and161 * using styles.162 *163 * @param context the context in which the dialog should run164 * @param themeResId a style resource describing the theme to use for the165 * window, or {@code 0} to use the default dialog theme166 */
167 public Dialog(@NonNull Context context, @StyleRes int themeResId) {168 this(context, themeResId, true);169 }170171 Dialog(@NonNull Context context, @StyleRes int themeResId, boolean createContextThemeWrapper) {172 if (createContextThemeWrapper) {173 if (themeResId == 0) {174 final TypedValue outValue = new TypedValue();175 context.getTheme().resolveAttribute(R.attr.dialogTheme, outValue, true); //若值为0,则默认设置dialogTheme样式176 themeResId = outValue.resourceId;177 }178 mContext = new ContextThemeWrapper(context, themeResId);179 } else {180 mContext = context;181 }182183 mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);184185 final Window w = new PhoneWindow(mContext);186 mWindow = w;187 w.setCallback(this);188 w.setOnWindowDismissedCallback(this);189 w.setWindowManager(mWindowManager, null, null);190 w.setGravity(Gravity.CENTER);191192 mListenersHandler = new ListenersHandler(this);193 }
其中
if (themeResId == 0) {
final TypedValue outValue = new TypedValue();
context.getTheme().resolveAttribute(R.attr.dialogTheme, outValue, true);
themeResId = outValue.resourceId;
}
从上述代码可以看出,若Dialog没有设置默认样式,系统会自动给你适配为R.attr.dialogTheme样式。
而查看themes.xml后,发现 dialogTheme样式是自带有Padding值的,所以match_parent自然是无效的。
那么,如何实现match_parent呢
(1) 设置padding值为0。
dialog.getWindow().getDecorView().setPadding(0, 0, 0, 0);
(2) 自定义一个Theme,覆盖原生Theme。
OrderFilterDialog dialog = new OrderFilterDialog(context, R.style.test);
运行效果如下,
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