Java tutorial
/* * Copyright (C) 2015 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package android.support.design.widget; import android.content.Context; import android.content.res.TypedArray; import android.os.Build; import android.os.Bundle; import android.support.annotation.LayoutRes; import android.support.annotation.NonNull; import android.support.annotation.StyleRes; import android.support.design.R; import android.support.v4.view.AccessibilityDelegateCompat; import android.support.v4.view.ViewCompat; import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat; import android.support.v7.app.AppCompatDialog; import android.util.TypedValue; import android.view.View; import android.view.ViewGroup; import android.view.Window; import android.widget.FrameLayout; /** * Base class for {@link android.app.Dialog}s styled as a bottom sheet. */ public class BottomSheetDialog extends AppCompatDialog { private BottomSheetBehavior<FrameLayout> mBehavior; boolean mCancelable = true; private boolean mCanceledOnTouchOutside = true; private boolean mCanceledOnTouchOutsideSet; public BottomSheetDialog(@NonNull Context context) { this(context, 0); } public BottomSheetDialog(@NonNull Context context, @StyleRes int theme) { super(context, getThemeResId(context, theme)); // We hide the title bar for any style configuration. Otherwise, there will be a gap // above the bottom sheet when it is expanded. supportRequestWindowFeature(Window.FEATURE_NO_TITLE); } protected BottomSheetDialog(@NonNull Context context, boolean cancelable, OnCancelListener cancelListener) { super(context, cancelable, cancelListener); supportRequestWindowFeature(Window.FEATURE_NO_TITLE); mCancelable = cancelable; } @Override public void setContentView(@LayoutRes int layoutResId) { super.setContentView(wrapInBottomSheet(layoutResId, null, null)); } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); } @Override public void setContentView(View view) { super.setContentView(wrapInBottomSheet(0, view, null)); } @Override public void setContentView(View view, ViewGroup.LayoutParams params) { super.setContentView(wrapInBottomSheet(0, view, params)); } @Override public void setCancelable(boolean cancelable) { super.setCancelable(cancelable); if (mCancelable != cancelable) { mCancelable = cancelable; if (mBehavior != null) { mBehavior.setHideable(cancelable); } } } @Override protected void onStart() { super.onStart(); if (mBehavior != null) { mBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED); } } @Override public void setCanceledOnTouchOutside(boolean cancel) { super.setCanceledOnTouchOutside(cancel); if (cancel && !mCancelable) { mCancelable = true; } mCanceledOnTouchOutside = cancel; mCanceledOnTouchOutsideSet = true; } private View wrapInBottomSheet(int layoutResId, View view, ViewGroup.LayoutParams params) { final CoordinatorLayout coordinator = (CoordinatorLayout) View.inflate(getContext(), R.layout.design_bottom_sheet_dialog, null); if (layoutResId != 0 && view == null) { view = getLayoutInflater().inflate(layoutResId, coordinator, false); } FrameLayout bottomSheet = (FrameLayout) coordinator.findViewById(R.id.design_bottom_sheet); mBehavior = BottomSheetBehavior.from(bottomSheet); mBehavior.setBottomSheetCallback(mBottomSheetCallback); mBehavior.setHideable(mCancelable); if (params == null) { bottomSheet.addView(view); } else { bottomSheet.addView(view, params); } // We treat the CoordinatorLayout as outside the dialog though it is technically inside coordinator.findViewById(R.id.touch_outside).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (mCancelable && isShowing() && shouldWindowCloseOnTouchOutside()) { cancel(); } } }); // Handle accessibility events ViewCompat.setAccessibilityDelegate(bottomSheet, new AccessibilityDelegateCompat() { @Override public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) { super.onInitializeAccessibilityNodeInfo(host, info); if (mCancelable) { info.addAction(AccessibilityNodeInfoCompat.ACTION_DISMISS); info.setDismissable(true); } else { info.setDismissable(false); } } @Override public boolean performAccessibilityAction(View host, int action, Bundle args) { if (action == AccessibilityNodeInfoCompat.ACTION_DISMISS && mCancelable) { cancel(); return true; } return super.performAccessibilityAction(host, action, args); } }); return coordinator; } boolean shouldWindowCloseOnTouchOutside() { if (!mCanceledOnTouchOutsideSet) { if (Build.VERSION.SDK_INT < 11) { mCanceledOnTouchOutside = true; } else { TypedArray a = getContext() .obtainStyledAttributes(new int[] { android.R.attr.windowCloseOnTouchOutside }); mCanceledOnTouchOutside = a.getBoolean(0, true); a.recycle(); } mCanceledOnTouchOutsideSet = true; } return mCanceledOnTouchOutside; } private static int getThemeResId(Context context, int themeId) { if (themeId == 0) { // If the provided theme is 0, then retrieve the dialogTheme from our theme TypedValue outValue = new TypedValue(); if (context.getTheme().resolveAttribute(R.attr.bottomSheetDialogTheme, outValue, true)) { themeId = outValue.resourceId; } else { // bottomSheetDialogTheme is not provided; we default to our light theme themeId = R.style.Theme_Design_Light_BottomSheetDialog; } } return themeId; } private BottomSheetBehavior.BottomSheetCallback mBottomSheetCallback = new BottomSheetBehavior.BottomSheetCallback() { @Override public void onStateChanged(@NonNull View bottomSheet, @BottomSheetBehavior.State int newState) { if (newState == BottomSheetBehavior.STATE_HIDDEN) { cancel(); } } @Override public void onSlide(@NonNull View bottomSheet, float slideOffset) { } }; }