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Android开发工程师文集-提示框，菜单，数据存储，组件篇

IT知识Android开发开发工程师

知是行的主意,行是知的功夫。这篇文章主要讲述Android开发工程师文集-提示框，菜单，数据存储，组件篇相关的知识，希望能为你提供帮助。
提示框，菜单，数据存储，组件篇 Toast

Toast.makeText(context, text, 时间).show();
setDuration(); //设置时间
setGravity(); //位置
获取：
添加toast.getView();
imageView添加到toast中，addView();
LayoutInflater inflater = LayoutInflater.from(this); View toast_view=inflater.inflate(R.id.,null); Toast. Toast.setView(toast_view);

AlertDialogAlertDialog.Builder
setTitle(); setIcon(); setView(); setItems(); setMultiChoiceItems(); 复选 setSingleChoiceItems(); 单选 setNeutralButton(); setPositiveButton(); setNegativeButton();

AlertDialog dialog = builder.create(); .show(); 消失 dialog.dismiss();

Notification通知栏，如接收短信
属性 Notification setTicker(); //手机状态栏的提示 setWhen(); //设置时间 setContentTitle(); setContentText(); setContentIntent(); Notification notification = builder.build();

OptionsMenu
onCreateOptionsMenu(); 动态：menu.add(); 监听：onOptionsItemSelected();

public boolean onCreateOptionsMenu(Menu menu){ getMenuInflater().inflate(R.menu.main,menu); return true; }

监听：onOptionsItemSelected
public boolean onOptionsItemSelected(MenuItem item){ switch(item.getItemId()){ case R.id..: ... } }

ContextMenu上下文菜单
public boolean onCreateItemSelected(MenuItem item){}public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo){ super.onCreateContextMenu(menu, v, menuIfo); }

SubMenu 子菜单
protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); }public boolean onCreateOptionsMenu(Menu menu){ getMenuInflater().inflate(R.menu.main, menu); return true; //return super.onOptionsItemSelected(item); }

xml
< menu ...> < item android:showAsAction=" never" android:title=" 文件" > < menu> < item android:id=" @+id/.." android:showAsAction=" never" android:title=" 打开" /> < /menu>

MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.main, menu);

数据存储方式四种：
  1. SharedPreferences
  2. SQLite
  3. Content Provider
  4. File
SharedPreferences是一种比较轻型的数据存储，基于xml的键值对存储，存储一些简单的信息。
SharedPreferences只能获取数据不能存储和修改，但能通过Editor实现存储修改。
步骤：
  1. 获取SharedPreferences对象
  2. SharedPreferences.Editor
  3. Editor的putXXX的方法
  4. Editor.commit()
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);

SharedPreferences sharedPreferences = getSharedPreferences(" sharedPreferences" , MODE_PRIVATE); Editor editor = sharedPreferences.edit(); editor.putXXX(); editor.commit();

用户名和密码的存储
sharedPreferences = getSharedPreferences(" UserInfo" , MODE_PRIVATE); Editor editor = sharedPreferences.editor();

登录 String name = etName.getText().toString().trim(); String pass = etPass.getText().toString().trim();

SQLite的形式，以单个文件的存储，存储2T内存，以B-Tree形式。
SQLite的数据类型，null,integer,real,text,blob。
  1. SQLiteDatabase
  2. SQLiteOpenHelper
SQLiteDatabase db = openOrCreateDatabase(" table.db" , MODE_PRIVATE, null);

SQLiteOpenHelper
DBOpenHelper helper = new DBOpenHelper(MainActivity.this, " user.db" ); SQLiteDatabase db = helper.getWritableDatabase(); Cursor c = db.rawQuery(" select * from user" , null);

public DBOpenHelper(Context context, String name, CursorFactory factory, int version){ super(context, name, factory, version); }public void onCreate(SQLiteDatabase db){}public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){}

File file = this.getFilesDir(); File file = this.getCacheDir(); //重要文件就不要放在这里

MODE_PRIVATE
默认操作
MODE_APPEND
文件是否存在
public void WriteFiles(String content){ try{ FileOutputStream fileOutputStream = openFileOutput(" super.txt" , MODE_PRIVATE); fileOutputStream.write(content.getBytes()); fileOutputStream.close(); }catch(){}catch(){} }

ContentProvider
< provider android:name=" " android:authorities=" " />

public class MyContentProvider extends ContentProvider{ public int delete(Uri uri,String selection, String[] selectionArgs){} }

Uri 通用资源标志符
Broadcast广播
BroadcastReceiver 广播接收器
使用：需要Intent对象，sendBroadcast(),sendOrderBroadcast(),sendStickyBroadcast()。
Service
注册：
< service android:name=" " />

public void onClick(View v){ switch(v.getId()){ case R.id.: Intent intent = new Intent(MainActivity.this, MyService.class); startService(intent); break; } }

public class MyService extends Service{ public void onCreate(){ super.onCreate(); } public int onStartCommand(Intent intent,int flags,int startId){ return super.onStartCommand(intent,flags,startId); } public void onDestroy(){ super.onDestroy(); } public IBinder onBind(Intent intent){ return null; } }

Bind
public void onCreate(){} public IBinder onBind(Intent intent){} public void unbindService(ServiceConnection conn){}

ServiceConnection conn = new ServiceConnection(){ public void onServiceDisconnected(ComponentName name){} public void onServiceConnected(ComponentName name, IBinder binder){} }

系统服务
MountService,ClipboardService,getSystemService().
public Object getSystemService(String name){}

POWER_SERVICE,PowerManger电源服务
ALARM_SERVICE,AlarmManager闹钟服务
LayoutInflater inflater = MainActivity.this.getSystemService(LAYOUT_INFLATER_SERVICE); View view = inflater.inflate(R.layout. , null); setContentView(view);

getSystemService
GestureDetector
MotionEvent,GestureDetector,onGestureListener.

GestureOverlayView
Android:eventsInterceptionEnabled Android:fadeDuration Android:fadeEnabled Android:gestureColor

< android.gesture.GestureOverlayView android:id=" " android:layout_width=" " android:layout_height=" " > < ImageView android:id=" " android:layout_width=" " android:layout_height=" " < /android.gesture.GestureOverlayView>

【Android开发工程师文集-提示框，菜单，数据存储，组件篇】定位：分享 Android& java 知识点
完结！

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