Chiao Cheng | a6b4c79 | 2012-10-31 15:18:29 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License |
| 15 | */ |
| 16 | |
| 17 | package com.android.contacts.common.dialog; |
| 18 | |
| 19 | import android.app.Dialog; |
Brian Attwell | c2e912c | 2014-10-27 12:29:44 -0700 | [diff] [blame] | 20 | import android.app.DialogFragment; |
Chiao Cheng | a6b4c79 | 2012-10-31 15:18:29 -0700 | [diff] [blame] | 21 | import android.app.FragmentManager; |
| 22 | import android.app.ProgressDialog; |
| 23 | import android.content.DialogInterface; |
| 24 | import android.os.Bundle; |
| 25 | import android.os.Handler; |
| 26 | |
| 27 | /** |
| 28 | * Indeterminate progress dialog wrapped up in a DialogFragment to work even when the device |
| 29 | * orientation is changed. Currently, only supports adding a title and/or message to the progress |
| 30 | * dialog. There is an additional parameter of the minimum amount of time to display the progress |
| 31 | * dialog even after a call to dismiss the dialog {@link #dismiss()} or |
| 32 | * {@link #dismissAllowingStateLoss()}. |
| 33 | * <p> |
| 34 | * To create and show the progress dialog, use |
| 35 | * {@link #show(FragmentManager, CharSequence, CharSequence, long)} and retain the reference to the |
| 36 | * IndeterminateProgressDialog instance. |
| 37 | * <p> |
| 38 | * To dismiss the dialog, use {@link #dismiss()} or {@link #dismissAllowingStateLoss()} on the |
| 39 | * instance. The instance returned by |
| 40 | * {@link #show(FragmentManager, CharSequence, CharSequence, long)} is guaranteed to be valid |
| 41 | * after a device orientation change because the {@link #setRetainInstance(boolean)} is called |
| 42 | * internally with true. |
| 43 | */ |
Brian Attwell | c2e912c | 2014-10-27 12:29:44 -0700 | [diff] [blame] | 44 | public class IndeterminateProgressDialog extends DialogFragment { |
Chiao Cheng | a6b4c79 | 2012-10-31 15:18:29 -0700 | [diff] [blame] | 45 | private static final String TAG = IndeterminateProgressDialog.class.getSimpleName(); |
| 46 | |
| 47 | private CharSequence mTitle; |
| 48 | private CharSequence mMessage; |
| 49 | private long mMinDisplayTime; |
| 50 | private long mShowTime = 0; |
| 51 | private boolean mActivityReady = false; |
| 52 | private Dialog mOldDialog; |
| 53 | private final Handler mHandler = new Handler(); |
| 54 | private boolean mCalledSuperDismiss = false; |
| 55 | private boolean mAllowStateLoss; |
| 56 | private final Runnable mDismisser = new Runnable() { |
| 57 | @Override |
| 58 | public void run() { |
| 59 | superDismiss(); |
| 60 | } |
| 61 | }; |
| 62 | |
| 63 | /** |
| 64 | * Creates and shows an indeterminate progress dialog. Once the progress dialog is shown, it |
| 65 | * will be shown for at least the minDisplayTime (in milliseconds), so that the progress dialog |
| 66 | * does not flash in and out to quickly. |
| 67 | */ |
| 68 | public static IndeterminateProgressDialog show(FragmentManager fragmentManager, |
| 69 | CharSequence title, CharSequence message, long minDisplayTime) { |
| 70 | IndeterminateProgressDialog dialogFragment = new IndeterminateProgressDialog(); |
| 71 | dialogFragment.mTitle = title; |
| 72 | dialogFragment.mMessage = message; |
| 73 | dialogFragment.mMinDisplayTime = minDisplayTime; |
| 74 | dialogFragment.show(fragmentManager, TAG); |
| 75 | dialogFragment.mShowTime = System.currentTimeMillis(); |
| 76 | dialogFragment.setCancelable(false); |
| 77 | |
| 78 | return dialogFragment; |
| 79 | } |
| 80 | |
| 81 | @Override |
| 82 | public void onCreate(Bundle savedInstanceState) { |
| 83 | super.onCreate(savedInstanceState); |
| 84 | setRetainInstance(true); |
| 85 | } |
| 86 | |
| 87 | @Override |
| 88 | public Dialog onCreateDialog(Bundle savedInstanceState) { |
| 89 | // Create the progress dialog and set its properties |
| 90 | final ProgressDialog dialog = new ProgressDialog(getActivity()); |
| 91 | dialog.setIndeterminate(true); |
| 92 | dialog.setIndeterminateDrawable(null); |
| 93 | dialog.setTitle(mTitle); |
| 94 | dialog.setMessage(mMessage); |
| 95 | |
| 96 | return dialog; |
| 97 | } |
| 98 | |
| 99 | @Override |
| 100 | public void onStart() { |
| 101 | super.onStart(); |
| 102 | mActivityReady = true; |
| 103 | |
| 104 | // Check if superDismiss() had been called before. This can happen if in a long |
| 105 | // running operation, the user hits the home button and closes this fragment's activity. |
| 106 | // Upon returning, we want to dismiss this progress dialog fragment. |
| 107 | if (mCalledSuperDismiss) { |
| 108 | superDismiss(); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | @Override |
| 113 | public void onStop() { |
| 114 | super.onStop(); |
| 115 | mActivityReady = false; |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * There is a race condition that is not handled properly by the DialogFragment class. |
| 120 | * If we don't check that this onDismiss callback isn't for the old progress dialog from before |
| 121 | * the device orientation change, then this will cause the newly created dialog after the |
| 122 | * orientation change to be dismissed immediately. |
| 123 | */ |
| 124 | @Override |
| 125 | public void onDismiss(DialogInterface dialog) { |
| 126 | if (mOldDialog != null && mOldDialog == dialog) { |
| 127 | // This is the callback from the old progress dialog that was already dismissed before |
| 128 | // the device orientation change, so just ignore it. |
| 129 | return; |
| 130 | } |
| 131 | super.onDismiss(dialog); |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * Save the old dialog that is about to get destroyed in case this is due to a change |
| 136 | * in device orientation. This will allow us to intercept the callback to |
| 137 | * {@link #onDismiss(DialogInterface)} in case the callback happens after a new progress dialog |
| 138 | * instance was created. |
| 139 | */ |
| 140 | @Override |
| 141 | public void onDestroyView() { |
| 142 | mOldDialog = getDialog(); |
| 143 | super.onDestroyView(); |
| 144 | } |
| 145 | |
| 146 | /** |
| 147 | * This tells the progress dialog to dismiss itself after guaranteeing to be shown for the |
| 148 | * specified time in {@link #show(FragmentManager, CharSequence, CharSequence, long)}. |
| 149 | */ |
| 150 | @Override |
| 151 | public void dismiss() { |
| 152 | mAllowStateLoss = false; |
| 153 | dismissWhenReady(); |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * This tells the progress dialog to dismiss itself (with state loss) after guaranteeing to be |
| 158 | * shown for the specified time in |
| 159 | * {@link #show(FragmentManager, CharSequence, CharSequence, long)}. |
| 160 | */ |
| 161 | @Override |
| 162 | public void dismissAllowingStateLoss() { |
| 163 | mAllowStateLoss = true; |
| 164 | dismissWhenReady(); |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * Tells the progress dialog to dismiss itself after guaranteeing that the dialog had been |
| 169 | * showing for at least the minimum display time as set in |
| 170 | * {@link #show(FragmentManager, CharSequence, CharSequence, long)}. |
| 171 | */ |
| 172 | private void dismissWhenReady() { |
| 173 | // Compute how long the dialog has been showing |
| 174 | final long shownTime = System.currentTimeMillis() - mShowTime; |
| 175 | if (shownTime >= mMinDisplayTime) { |
| 176 | // dismiss immediately |
| 177 | mHandler.post(mDismisser); |
| 178 | } else { |
| 179 | // Need to wait some more, so compute the amount of time to sleep. |
| 180 | final long sleepTime = mMinDisplayTime - shownTime; |
| 181 | mHandler.postDelayed(mDismisser, sleepTime); |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * Actually dismiss the dialog fragment. |
| 187 | */ |
| 188 | private void superDismiss() { |
| 189 | mCalledSuperDismiss = true; |
| 190 | if (mActivityReady) { |
| 191 | // The fragment is either in onStart or past it, but has not gotten to onStop yet. |
| 192 | // It is safe to dismiss this dialog fragment. |
| 193 | if (mAllowStateLoss) { |
| 194 | super.dismissAllowingStateLoss(); |
| 195 | } else { |
| 196 | super.dismiss(); |
| 197 | } |
| 198 | } |
| 199 | // If mActivityReady is false, then this dialog fragment has already passed the onStop |
| 200 | // state. This can happen if the user hit the 'home' button before this dialog fragment was |
| 201 | // dismissed or if there is a configuration change. |
| 202 | // In the event that this dialog fragment is re-attached and reaches onStart (e.g., |
| 203 | // because the user returns to this fragment's activity or the device configuration change |
| 204 | // has re-attached this dialog fragment), because the mCalledSuperDismiss flag was set to |
| 205 | // true, this dialog fragment will be dismissed within onStart. So, there's nothing else |
| 206 | // that needs to be done. |
| 207 | } |
| 208 | } |