android 2.2 apidemos 赏析笔记 2
PACKAGE:com.example.android.apis.app
CustomDialogActivity.java
SEE:
1.custom_dialog_activity.xml
<TextViewxmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/text"
android:layout_width="match_parent"android:layout_height="match_parent"
android:gravity="center_vertical|center_horizontal"
android:text="@string/custom_dialog_activity_text"/>
2.AndroidManifest.xml
<activityandroid:name=".app.CustomDialogActivity"
android:label="@string/activity_custom_dialog"
android:theme="@style/Theme.CustomDialog">
<intent-filter>
<actionandroid:name="android.intent.action.MAIN"/>
<categoryandroid:name="android.intent.category.SAMPLE_CODE"/>
</intent-filter>
</activity>
3.values.styles.xml
<stylename="Theme.CustomDialog"parent="android:style/Theme.Dialog">
<itemname="android:windowBackground">@drawable/filled_box</item>
</style>
4.drawable.fill_box.xml
<shapexmlns:android="http://schemas.android.com/apk/res/android">
<solidandroid:color="#f0600000"/>
<strokeandroid:width="3dp"color="#ffff8080"/>
<cornersandroid:radius="3dp"/>
<paddingandroid:left="10dp"android:top="10dp"
android:right="10dp"android:bottom="10dp"/>
</shape>
SO:很是纠结的一个设置呀，解耦解成这样不容易呀。
CustomTitle.java
SEE:
1.onCreate()
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE,R.layout.custom_title_1);
2.layout.custom_title_1.xml
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/screen"
android:layout_width="match_parent"android:layout_height="match_parent"
android:orientation="vertical">
<TextViewandroid:id="@+id/left_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:text="@string/custom_title_left"/>
<TextViewandroid:id="@+id/right_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:text="@string/custom_title_right"/>
</RelativeLayout>
SO:
设置标题栏样式的方法。。。
DialogActivity.java
SEE:
1.onCreate()=>
requestWindowFeature(Window.FEATURE_LEFT_ICON);
getWindow().setFeatureDrawableResource(Window.FEATURE_LEFT_ICON,
android.R.drawable.ic_dialog_alert);
SO:
设置那个感叹号的方法。。。真短。。其他应该同CUSTOM_DIALOG
Forwarding.java
SEE:
1.onClick()=>
Intentintent=newIntent();
intent.setClass(Forwarding.this,ForwardTarget.class);
startActivity(intent);
finish();
SO:
只要finish()掉这个activity,就不会呆在栈上了。。回来也见不到他了。。
HelloWorld.java
无视。。
SEE:
1.res.value.string.xml
<stringname="hello_world"><b>Hello,<i>World!</i></b></string>
SO：
这里可以设置格式。。。
PersistentState.java
SEE:
1.save_restore_state.xml
<EditTextandroid:id="@+id/saved"
android:layout_width="match_parent"android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/green"
android:text="@string/initial_text"
android:freezesText="true">
<requestFocus/>
</EditText>
2.onResume()
SharedPreferencesprefs=getPreferences(0);
StringrestoredText=prefs.getString("text",null);
if(restoredText!=null){
mSaved.setText(restoredText,TextView.BufferType.EDITABLE);
intselectionStart=prefs.getInt("selection-start",-1);
intselectionEnd=prefs.getInt("selection-end",-1);
if(selectionStart!=-1&&selectionEnd!=-1){
mSaved.setSelection(selectionStart,selectionEnd);
}
}
3.onPause()
SharedPreferences.Editoreditor=getPreferences(0).edit();
editor.putString("text",mSaved.getText().toString());
editor.putInt("selection-start",mSaved.getSelectionStart());
editor.putInt("selection-end",mSaved.getSelectionEnd());
editor.commit();
SO:
见sharePreferences的保存方式~。。。这个还可以保存选择文字的开始点和结束点
=========================END
QuickContactsDemo.JAVA
SEE:
1.QuickContactsDemo.java
staticfinalString[]CONTACTS_SUMMARY_PROJECTION=newString[]{
Contacts._ID,//0
Contacts.DISPLAY_NAME,//1
Contacts.STARRED,//2
Contacts.TIMES_CONTACTED,//3
Contacts.CONTACT_PRESENCE,//4
Contacts.PHOTO_ID,//5
Contacts.LOOKUP_KEY,//6
Contacts.HAS_PHONE_NUMBER,//7
};
2.onCreate()
Stringselect="(("+Contacts.DISPLAY_NAME+"NOTNULL)AND("
+Contacts.HAS_PHONE_NUMBER+"=1)AND("
+Contacts.DISPLAY_NAME+"!=''))";
Cursorc=
getContentResolver().query(Contacts.CONTENT_URI,CONTACTS_SUMMARY_PROJECTION,select,
null,Contacts.DISPLAY_NAME+"COLLATELOCALIZEDASC");
SO:
获得了联系人的表，需要什么参数什么条件再改。。。
SEE:
1.startManagingCursor(c);
SO:
startManagingCursor(Cursorc)
ThismethodallowstheactivitytotakecareofmanagingthegivenCursor'slifecycleforyoubasedontheactivity'slifecycle.
SEE:
1.
finalContactListItemCachecache=(ContactListItemCache)view.getTag();
2.
finalstaticclassContactListItemCache{
publicTextViewnameView;
publicQuickContactBadgephotoView;
publicCharArrayBuffernameBuffer=newCharArrayBuffer(128);
}
3.
publicViewnewView(Contextcontext,Cursorcursor,ViewGroupparent){
Viewview=super.newView(context,cursor,parent);
ContactListItemCachecache=newContactListItemCache();
cache.nameView=(TextView)view.findViewById(R.id.name);
cache.photoView=(QuickContactBadge)view.findViewById(R.id.badge);
view.setTag(cache);
returnview;
}
SO:
getTag()returnstheObjectstoredinthisviewasatag将某个对象作为tag保存在view中。。在newView中进行tag和View的绑定。隐藏view的细节。。。设置的时候不用一直findViewById了
SEE:
1.bindView()
SO:
abstractvoidbindView()Bindanexistingviewtothedatapointedtobycursor
SEE:
1.bindView()
finalContactListItemCachecache=(ContactListItemCache)view.getTag();
TextViewnameView=cache.nameView;
QuickContactBadgephotoView=cache.photoView;
//Setthename
cursor.copyStringToBuffer(SUMMARY_NAME_COLUMN_INDEX,cache.nameBuffer);
intsize=cache.nameBuffer.sizeCopied;
cache.nameView.setText(cache.nameBuffer.data,0,size);
finallongcontactId=cursor.getLong(SUMMARY_ID_COLUMN_INDEX);
finalStringlookupKey=cursor.getString(SUMMARY_LOOKUP_KEY);
cache.photoView.assignContactUri(Contacts.getLookupUri(contactId,lookupKey));
SO:
cursor的取值操作，绑定View的tag的设置工作。。
SEE:
1.
ContactListItemAdapteradapter=newContactListItemAdapter(this,R.layout.quick_contacts,c);
2.
layout.quick_contacts.xml
SO:看看就好adapter的每一项的布局。。
ReseiveResult.java
SEE:
1.onClick()
Intentintent=newIntent(ReceiveResult.this,SendResult.class);
startActivityForResult(intent,GET_CODE);
2.
protectedvoidonActivityResult(intrequestCode,intresultCode,
Intentdata)
SO:
开始一个Activity来接收result
SEE:SendResult.java
1.
setResult(RESULT_OK,(newIntent()).setAction("Corky!"));
finish();
SO:
返回ok并带回一个结果。。。。居然以ACTION的形式传回来。。而不是intent.putExtra，懒呀懒呀。
RedirectMain.java
SEE:
1.RedirectEnter.java
Intentintent=newIntent(RedirectEnter.this,RedirectMain.class);
startActivity(intent);
2.RedirectMain.java
if(!loadPrefs()){
Intentintent=newIntent(this,RedirectGetter.class);
startActivityForResult(intent,INIT_TEXT_REQUEST);
}
...
if(resultCode==RESULT_CANCELED){
finish();
SO:
进来无数据就跳走，返回为CANCELLED就finish();这个逻辑真纠结。
SEE:
1.RedirectGetter.java
SharedPreferencespreferences=getSharedPreferences("RedirectData",0);
SharedPreferences.Editoreditor=preferences.edit();
editor.putString("text",mText.getText().toString());
if(editor.commit()){
setResult(RESULT_OK);
}
SO:
在复习一次sharedPreferences保存方法。
ReorderOnLaunch.java
SEE:
1.ReorderFour.java
Intentintent=newIntent(ReorderFour.this,ReorderTwo.class);
intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivity(intent);
SO:
如果栈中有这个Activity则放到最前端。点了N多下之后，如果返回的话，会发现second只有一个。。。因为总是被带到前端来，而不是重新创建一个实例。。singletask?
SaveRestoreState.java
1.
/**
*Retrievethetextthatiscurrentlyinthe"saved"editor.
*/
CharSequencegetSavedText(){
return((EditText)findViewById(R.id.saved)).getText();
}
/**
*Changethetextthatiscurrentlyinthe"saved"editor.
*/
voidsetSavedText(CharSequencetext){
((EditText)findViewById(R.id.saved)).setText(text);
}
2.
<EditTextandroid:id="@+id/saved"
android:layout_width="match_parent"android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/green"
android:text="@string/initial_text"
android:freezesText="true">
<requestFocus/>
</EditText>
SO:
横竖屏的切换实际上是销毁一个ACTIVITY并创建另一个ACTIVITY，当然不能保存EditText里的数据，根据一个属性android:freezesText="true"两个方法getSavedText()setSavedText()就能保存里面的数据。
SetWallpaperActivity.java
SEE:
1.layout.wallpaper.xml
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageview"/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="match_parent">
SO:
这样布局就有背景与按钮两层了。。。FrameLayout原来以为很废物的。。
SEE:
1.onCreate()
finalWallpaperManagerwallpaperManager=WallpaperManager.getInstance(this);
finalDrawablewallpaperDrawable=wallpaperManager.getDrawable();
finalImageViewimageView=(ImageView)findViewById(R.id.imageview);
imageView.setDrawingCacheEnabled(true);
imageView.setImageDrawable(wallpaperDrawable);
SO:
获取WallpaperManager然后又获取Drawable然后就可以获取壁纸了。
SEE:
1.
intmColor=(int)Math.floor(Math.random()*mColors.length);
wallpaperDrawable.setColorFilter(mColors[mColor],PorterDuff.Mode.MULTIPLY);
imageView.setImageDrawable(wallpaperDrawable);
imageView.invalidate();
SO:
设置一个Drawable的ColorFilter就可以有滤镜的效果。。。待研究
SEE:
1.
wallpaperManager.setBitmap(imageView.getDrawingCache());
2.imageView.setDrawingCacheEnabled(true);
SO:获取View的DrawingCache，输出到WallpaperManager成壁纸。应该也可以输出到别的地方吧，把一个view的DrawingCache来做变换效果。根view的难道可以实现截屏？。。MARK
TranslucentActivity.java
SEE:
1.AndroidManifest.xml
<activityandroid:name=".app.TranslucentActivity"
android:label="@string/activity_translucent"
android:theme="@style/Theme.Translucent">
2.values.styles.xml
<stylename="Theme.Translucent"parent="android:style/Theme.Translucent">
<itemname="android:windowBackground">@drawable/translucent_background</item>
<itemname="android:windowNoTitle">true</item>
<itemname="android:colorForeground">#fff</item>
</style>
SO:
将android:windowBackground设置为@drawable/translucent_background应该就可以了吧
TranslucentBlueActivity.java
SEE:
1.onCreate()
getWindow().setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND,
WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
SO:
背景模糊效果~
WallpaperActivity.java
SEE
1.values.style.xml
<stylename="Theme.Wallpaper"parent="android:style/Theme.Wallpaper">
<itemname="android:colorForeground">#fff</item>
</style>
SO:不是Theme.Translucent而已。。。
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