1 page.title= 2 page.tags=, 3 @jd:body 4 5 <div id="qv-wrapper"> 6 <div id="qv"> 7 8 <h2> </h2> 9 <ol> 10 <li><a href="#RetainingAnObject"> </a></li> 11 <li><a href="#HandlingTheChange"> </a> 12 </ol> 13 14 <h2>. :</h2> 15 <ol> 16 <li><a href="providing-resources.html"> </a></li> 17 <li><a href="accessing-resources.html"> </a></li> 18 <li><a href="http://android-developers.blogspot.com/2009/02/faster-screen-orientation-change.html"> 19 </a></li> 20 </ol> 21 </div> 22 </div> 23 24 <p> 25 (, , ). , 26 Android 27 {@link android.app.Activity} ( {@link android.app.Activity#onDestroy()}, {@link 28 android.app.Activity#onCreate(Bundle) onCreate()}). 29 30 , .</p> 31 32 <p> , 33 <a href="{@docRoot}guide/components/activities.html#Lifecycle"> 34 </a>, Android 35 {@link android.app.Activity#onSaveInstanceState(Bundle) onSaveInstanceState()} 36 , . 37 {@link android.app.Activity#onCreate(Bundle) onCreate()} {@link 38 android.app.Activity#onRestoreInstanceState(Bundle) onRestoreInstanceState()}.</p> 39 40 <p> , , 41 (, ) 42 . 43 , , , 44 , 45 . , , <a href="{@docRoot}guide/components/activities.html#Lifecycle"> </a>.</p> 46 47 <p> , 48 . 49 :</p> 50 51 <ol type="a"> 52 <li><a href="#RetainingAnObject"> </a> 53 <p> , 54 .</p> 55 56 </li> 57 <li><a href="#HandlingTheChange"> </a> 58 <p> , 59 , 60 .</p> 61 </li> 62 </ol> 63 64 65 <h2 id="RetainingAnObject"> </h2> 66 67 <p> , 68 , 69 . , 70 {@link android.os.Bundle}, {@link 71 android.app.Activity#onSaveInstanceState(Bundle) onSaveInstanceState()}, 72 ( ), 73 , , . 74 {@link 75 android.app.Fragment} . 76 , .</p> 77 78 <p> Android , 79 , , . 80 .</p> 81 82 <p> :</p> 83 84 <ol> 85 <li> {@link android.app.Fragment} , 86 .</li> 87 <li> {@link android.app.Fragment#setRetainInstance(boolean)}, . 88 </li> 89 <li> .</li> 90 <li> {@link android.app.FragmentManager} 91 .</li> 92 </ol> 93 94 <p> :</p> 95 96 <pre> 97 public class RetainedFragment extends Fragment { 98 99 // data object we want to retain 100 private MyDataObject data; 101 102 // this method is only called once for this fragment 103 @Override 104 public void onCreate(Bundle savedInstanceState) { 105 super.onCreate(savedInstanceState); 106 // retain this fragment 107 setRetainInstance(true); 108 } 109 110 public void setData(MyDataObject data) { 111 this.data = data; 112 } 113 114 public MyDataObject getData() { 115 return data; 116 } 117 } 118 </pre> 119 120 <p class="caution"><strong>!</strong> , 121 , {@link android.app.Activity}, , {@link 122 android.graphics.drawable.Drawable}, {@link android.widget.Adapter}, {@link android.view.View} 123 , {@link android.content.Context}. 124 . ( 125 , , , 126 ).</p> 127 128 <p> {@link android.app.FragmentManager} . 129 , 130 . :</p> 131 132 <pre> 133 public class MyActivity extends Activity { 134 135 private RetainedFragment dataFragment; 136 137 @Override 138 public void onCreate(Bundle savedInstanceState) { 139 super.onCreate(savedInstanceState); 140 setContentView(R.layout.main); 141 142 // find the retained fragment on activity restarts 143 FragmentManager fm = getFragmentManager(); 144 dataFragment = (DataFragment) fm.findFragmentByTag(data); 145 146 // create the fragment and data the first time 147 if (dataFragment == null) { 148 // add the fragment 149 dataFragment = new DataFragment(); 150 fm.beginTransaction().add(dataFragment, data).commit(); 151 // load the data from the web 152 dataFragment.setData(loadMyData()); 153 } 154 155 // the data is available in dataFragment.getData() 156 ... 157 } 158 159 @Override 160 public void onDestroy() { 161 super.onDestroy(); 162 // store the data in the fragment 163 dataFragment.setData(collectMyLoadedData()); 164 } 165 } 166 </pre> 167 168 <p> {@link android.app.Activity#onCreate(Bundle) onCreate()} 169 . {@link android.app.Activity#onCreate(Bundle) onCreate()} 170 , , . 171 {@link android.app.Activity#onDestroy() onDestroy()} , , 172 .</p> 173 174 175 176 177 178 <h2 id="HandlingTheChange"> </h2> 179 180 <p> 181 <em></em> , 182 , 183 , .</p> 184 185 <p class="note"><strong>.</strong> 186 , 187 . , 188 , .</p> 189 190 <p> <a href="{@docRoot}guide/topics/manifest/activity-element.html">{@code <activity>}</a> 191 <a href="{@docRoot}guide/topics/manifest/activity-element.html#config">{@code 192 android:configChanges}</a> , , 193 . <a href="{@docRoot}guide/topics/manifest/activity-element.html#config">{@code 194 android:configChanges}</a> ( {@code "orientation"} 195 {@code "keyboardHidden"} 196 ). 197 , {@code |}.</p> 198 199 <p>, , 200 , :</p> 201 202 <pre> 203 <activity android:name=".MyActivity" 204 android:configChanges="orientation|keyboardHidden" 205 android:label="@string/app_name"> 206 </pre> 207 208 <p>, , {@code MyActivity} . 209 {@code MyActivity} {@link 210 android.app.Activity#onConfigurationChanged(Configuration) onConfigurationChanged()}. 211 {@link android.content.res.Configuration}, 212 . {@link android.content.res.Configuration} 213 , 214 , . 215 {@link android.content.res.Resources} 216 , 217 .</p> 218 219 <p class="caution"><strong>!</strong> Android 3.2 ( API 13), <strong> 220 </strong> 221 . , 222 API 13 ( <a href="{@docRoot}guide/topics/manifest/uses-sdk-element.html#min">{@code minSdkVersion}</a> <a href="{@docRoot}guide/topics/manifest/uses-sdk-element.html#target">{@code targetSdkVersion}</a> 223 ), {@code "screenSize"} {@code 224 "orientation"}. {@code 225 android:configChanges="orientation|screenSize"}. , API 226 12 , ( 227 Android 3.2 ).</p> 228 229 <p>, {@link 230 android.app.Activity#onConfigurationChanged(Configuration) onConfigurationChanged()} 231 :</p> 232 233 <pre> 234 @Override 235 public void onConfigurationChanged(Configuration newConfig) { 236 super.onConfigurationChanged(newConfig); 237 238 // Checks the orientation of the screen 239 if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) { 240 Toast.makeText(this, "landscape", Toast.LENGTH_SHORT).show(); 241 } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){ 242 Toast.makeText(this, "portrait", Toast.LENGTH_SHORT).show(); 243 } 244 } 245 </pre> 246 247 <p> {@link android.content.res.Configuration} 248 , . , 249 , , 250 . , {@link 251 android.content.res.Resources} , 252 {@link android.widget.ImageView} {@link android.widget.ImageView#setImageResource(int) 253 setImageResource()} 254 , , ( <a href="providing-resources.html#AlternateResources"> </a>).</p> 255 256 <p> , {@link 257 android.content.res.Configuration} , 258 {@link android.content.res.Configuration}. 259 . {@link 260 android.content.res.Configuration}.</p> 261 262 <p class="note"><strong>!</strong> , 263 , , . 264 , , , 265 , {@link 266 android.app.Activity#onConfigurationChanged(Configuration) onConfigurationChanged()}.</p> 267 268 <p> 269 , <em></em> {@link 270 android.app.Activity#onConfigurationChanged(Configuration) onConfigurationChanged()}. 271 , , 272 , . 273 , 274 . , 275 , , 276 , , , , 277 .</p> 278 279 <p> , , . <a href="{@docRoot}guide/topics/manifest/activity-element.html#config">{@code 280 android:configChanges}</a> 281 {@link android.content.res.Configuration}.</p> 282
