Android修改Dialog樣式的方法
protected AlertDialog(@NonNull Context context, @StyleRes int themeResId) {super(context, resolveDialogTheme(context, themeResId));//創建AlertController，是Dialog布局相關代碼mAlert = new AlertController(getContext(), this, getWindow()); }@NonNullpublic AlertDialog create() { // We can’t use Dialog’s 3-arg constructor with the createThemeContextWrapper param, // so we always have to re-set the theme final AlertDialog dialog = new AlertDialog(P.mContext, mTheme); P.apply(dialog.mAlert); dialog.setCancelable(P.mCancelable); if (P.mCancelable) {dialog.setCanceledOnTouchOutside(true); } dialog.setOnCancelListener(P.mOnCancelListener); dialog.setOnDismissListener(P.mOnDismissListener); if (P.mOnKeyListener != null) {dialog.setOnKeyListener(P.mOnKeyListener); } return dialog;}public void apply(AlertController dialog) { if (mCustomTitleView != null) {dialog.setCustomTitle(mCustomTitleView); } else {if (mTitle != null) { dialog.setTitle(mTitle);}if (mIcon != null) { dialog.setIcon(mIcon);}if (mIconId != 0) { dialog.setIcon(mIconId);} .......... AlertDialog 構造函數中會創建 AlertController，用來控制對話框的布局 P.apply(dialog.mAlert); 將用戶自定義的配置賦值給 AlertController 1.2 AlertController
public AlertController(Context context, AppCompatDialog di, Window window) {mContext = context;mDialog = di;mWindow = window;mHandler = new ButtonHandler(di);final TypedArray a = context.obtainStyledAttributes(null, R.styleable.AlertDialog,R.attr.alertDialogStyle, 0);mAlertDialogLayout = a.getResourceId(R.styleable.AlertDialog_android_layout, 0);mButtonPanelSideLayout = a.getResourceId(R.styleable.AlertDialog_buttonPanelSideLayout, 0);mListLayout = a.getResourceId(R.styleable.AlertDialog_listLayout, 0);mMultiChoiceItemLayout = a.getResourceId(R.styleable.AlertDialog_multiChoiceItemLayout, 0);mSingleChoiceItemLayout = a.getResourceId(R.styleable.AlertDialog_singleChoiceItemLayout, 0);mListItemLayout = a.getResourceId(R.styleable.AlertDialog_listItemLayout, 0);mShowTitle = a.getBoolean(R.styleable.AlertDialog_showTitle, true);mButtonIconDimen = a.getDimensionPixelSize(R.styleable.AlertDialog_buttonIconDimen, 0);a.recycle();/* We use a custom title so never request a window title */di.supportRequestWindowFeature(Window.FEATURE_NO_TITLE); }
R.attr.alertDialogStyle 是 對話框的默認樣式，
<item name='alertDialogStyle'>@style/AlertDialog.AppCompat</item><style name='AlertDialog.AppCompat' parent='Base.AlertDialog.AppCompat'/> <style name='Base.AlertDialog.AppCompat' parent='android:Widget'><item name='android:layout'>@layout/abc_alert_dialog_material</item><item name='listLayout'>@layout/abc_select_dialog_material</item><item name='listItemLayout'>@layout/select_dialog_item_material</item><item name='multiChoiceItemLayout'>@layout/select_dialog_multichoice_material</item><item name='singleChoiceItemLayout'>@layout/select_dialog_singlechoice_material</item><item name='buttonIconDimen'>@dimen/abc_alert_dialog_button_dimen</item> </style>
上述代碼可以看出，abc_alert_dialog_material 就是dialog的默認布局。
<androidx.appcompat.widget.AlertDialogLayout xmlns:android='http://schemas.android.com/apk/res/android' android: android:layout_width='match_parent' android:layout_height='wrap_content' android:gravity='start|left|top' android:orientation='vertical'> <include layout='@layout/abc_alert_dialog_title_material'/> <FrameLayoutandroid: android:layout_width='match_parent'android:layout_height='wrap_content'android:minHeight='48dp'><View android: android:layout_width='match_parent' android:layout_height='1dp' android:layout_gravity='top' android:background='?attr/colorControlHighlight' android:visibility='gone'/><androidx.core.widget.NestedScrollView android: android:layout_width='match_parent' android:layout_height='wrap_content' android:clipToPadding='false'> <LinearLayoutandroid:layout_width='match_parent'android:layout_height='wrap_content'android:orientation='vertical'><android.widget.Space android: android:layout_width='match_parent' android:layout_height='@dimen/abc_dialog_padding_top_material' android:visibility='gone'/><TextView android: android:layout_width='match_parent' android:layout_height='wrap_content' android:paddingLeft='?attr/dialogPreferredPadding' android:paddingRight='?attr/dialogPreferredPadding'/><android.widget.Space android: android:layout_width='match_parent' android:layout_height='@dimen/abc_dialog_padding_top_material' android:visibility='gone'/> </LinearLayout></androidx.core.widget.NestedScrollView><View android: android:layout_width='match_parent' android:layout_height='1dp' android:layout_gravity='bottom' android:background='?attr/colorControlHighlight' android:visibility='gone'/> </FrameLayout> <FrameLayoutandroid: android:layout_width='match_parent'android:layout_height='wrap_content'android:minHeight='48dp'><FrameLayout android: android:layout_width='match_parent' android:layout_height='wrap_content'/> </FrameLayout> <include layout='@layout/abc_alert_dialog_button_bar_material' android:layout_width='match_parent' android:layout_height='wrap_content'/></androidx.appcompat.widget.AlertDialogLayout>
標題布局：
<!-- abc_alert_dialog_title_material: --><LinearLayout xmlns:android='http://schemas.android.com/apk/res/android' android: android:layout_width='match_parent' android:layout_height='wrap_content' android:orientation='vertical'> <!-- If the client uses a customTitle, it will be added here. --> <LinearLayoutandroid: android:layout_width='match_parent'android:layout_height='wrap_content'android:gravity='center_vertical|start|left'android:orientation='horizontal'android:paddingLeft='?attr/dialogPreferredPadding'android:paddingRight='?attr/dialogPreferredPadding'android:paddingTop='@dimen/abc_dialog_padding_top_material'><ImageView android: android:layout_width='32dip' android:layout_height='32dip' android:layout_marginEnd='8dip' android:layout_marginRight='8dip' android:scaleType='fitCenter' android:src='http://m.b3g6.com/bcjs/@null'/><androidx.appcompat.widget.DialogTitle android: android:layout_width='match_parent' android:layout_height='wrap_content' android:layout_gravity='start' android:ellipsize='end' android:singleLine='true' android:textAlignment='viewStart'/> </LinearLayout> <android.widget.Spaceandroid: android:layout_width='match_parent'android:layout_height='@dimen/abc_dialog_title_divider_material'android:visibility='gone'/></LinearLayout>
按鈕布局：
<!-- abc_alert_dialog_button_bar_material: --><ScrollView xmlns:android='http://schemas.android.com/apk/res/android' android: android:layout_width='match_parent' android:layout_height='wrap_content' android:fillViewport='true' android:scrollIndicators='top|bottom'> <androidx.appcompat.widget.ButtonBarLayoutandroid:layout_width='match_parent'android:layout_height='wrap_content'android:gravity='bottom'android:layoutDirection='locale'android:orientation='horizontal'android:paddingBottom='4dp'android:paddingLeft='12dp'android:paddingRight='12dp'android:paddingTop='4dp'><Button android: android:layout_width='wrap_content' android:layout_height='wrap_content'/><android.widget.Space android: android:layout_width='0dp' android:layout_height='0dp' android:layout_weight='1' android:visibility='invisible'/><Button android: android:layout_width='wrap_content' android:layout_height='wrap_content'/><Button android: android:layout_width='wrap_content' android:layout_height='wrap_content'/> </androidx.appcompat.widget.ButtonBarLayout></ScrollView>二、修改Dialog樣式2.1 通過findViewById
AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage(msg); builder.setPositiveButton(getString(R.string.yes), null); AlertDialog dialog = builder.create(); dialog.show(); //直接通過id找到對應的控件 Button button = dialog.findViewById(android.R.id.button1); //或者通過getButton方法也可以獲取到 Button button2 = dialog.getButton(DialogInterface.BUTTON_POSITIVE);
這種修改方式必須在 show() 之后調用，否則會出現空指針異常。這個是因為，執行 show() 方法的時候，dialog才會初始化布局，具體源碼可以查看 Dialog 的 onCreate 方法。
2.2 自定義style通過上面源碼可以發現，Dialog三個按鈕的樣式如下：
buttonBarNeutralButtonStyle buttonBarNegativeButtonStyle buttonBarPositiveButtonStyle<Button android: android:layout_width='wrap_content' android:layout_height='wrap_content'/><android.widget.Space android: android:layout_width='0dp' android:layout_height='0dp' android:layout_weight='1' android:visibility='invisible'/><Button android: android:layout_width='wrap_content' android:layout_height='wrap_content'/><Button android: android:layout_width='wrap_content' android:layout_height='wrap_content'/>
自定義樣式替換上述 style即可達到修改效果。
在style.xml添加如下代碼：
<style name='accessPositiveBtnStyle' parent='Widget.AppCompat.Button.ButtonBar.AlertDialog'><item name='android:textColor'>@color/test1</item> </style> <style name='accessNegativeBtnStyle' parent='Widget.AppCompat.Button.ButtonBar.AlertDialog'><item name='android:textColor'>@color/test2</item> </style> <!-- 彈出框樣式 --> <style name='testDialogTheme' parent='Theme.AppCompat.Light.Dialog.Alert'><item name='buttonBarPositiveButtonStyle'>@style/accessPositiveBtnStyle</item><item name='buttonBarNegativeButtonStyle'>@style/accessNegativeBtnStyle</item> </style>
具體使用：
AlertDialog.Builder builder = new AlertDialog.Builder(this, R.style.testDialogTheme); builder.setMessage('Test'); builder.setCancelable(false); builder.setPositiveButton('確認', null); builder.setNegativeButton('取消', null); Dialog dialog = builder.create(); dialog.show();
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