我想像一个应用程序创建保持applcation [英] i want to create keep applcation like one applicatiobn

查看：70
本文介绍了我想像一个应用程序创建保持applcation的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

 package com.appsrox.smartpad.note; 
 
 import android.app.Activity; 
 import android.database.Cursor; 
 import android.database.sqlite.SQLiteDatabase; 
 import android.graphics.Typeface; 
 import android.os.Bundle; 
 import android.view.LayoutInflater; 
 import android.view.View; 
 import android.widget.AdapterView; 
 import android.widget.EditText; 
导入android.widget.Gallery; 
 import android.widget.ImageButton; 
 import android.widget.LinearLayout; 
 import android.widget.SimpleCursorAdapter; 
 import android.widget.Spinner; 
 import android.widget.SpinnerAdapter; 
 
 import com.appsrox.smartpad.R; 
 import com.appsrox.smartpad.SmartPad; 
 import com.appsrox.smartpad.model.Category; 
 import com.appsrox.smartpad.model.Note; 
 
  / *   * 
 * @author appsrox.com 
 * 
 * /  
  abstract   class  BaseActivity扩展活动{
 
  //   private static final String TAG =BaseActivity;  
 
  protected  ImageButton categoryBtn; 
  protected  Spinner spinner; 
  protected  EditText titleEdit; 
  protected  EditText contentEdit; 
  protected  ImageButton addItemBtn; 
  protected  LinearLayout checklistLL; 
 受保护图库; 
 
  protected  LayoutInflater inflater; 
  protected  SQLiteDatabase db; 
 受保护注意事项; 
 
  protected 字体字体; 
 
 @Override 
  public   void  onCreate（Bundle savedInstanceState）{ 
 super.onCreate（savedInstanceState）; 
 setContentView（R.layout.note）; 
 findViews（）; 
 
 inflater = getLayoutInflater（）; 
 db = SmartPad.db; 
 font = Typeface.createFromAsset（getAssets（），  fonts / OpenSans-Semibold.ttf）; 
 
  //  创建实例 
  long  noteId = getIntent（）。getLongExtra（Note.COL_ID， 0 ）; 
  if （noteId >   0 ）
 note =  new 注意（noteId）; 
  else  
 note =  new 注意（）; 
 
光标c = Category.list（db）; 
 startManagingCursor（c）; 
 SimpleCursorAdapter adapter =  new  SimpleCursorAdapter（
  this ，
 android。 R.layout.simple_spinner_item，
c，
  new   String  [] {Category。 COL_NAME}，
  new   int  [] {android.R.id.text1}）; 
 adapter.setDropDownViewResource（android.R.layout.simple_spinner_dropdown_item）; 
 spinner.setAdapter（adapter）; 
 
 spinner.setOnItemSelectedListener（ new  AdapterView.OnItemSelectedListener（）{
  public   void  onItemSelected（AdapterView note.setCategoryId（id）; 
 SmartPad.LASTSELECTED_CATEGORYID = id; 
} 
 
  public   void  onNothingSelected（AdapterView} 
}）; 
} 
 
 @Override 
  protected   void  onSaveInstanceState（Bundle outState）{
 super.onSaveInstanceState（outState）; 
 
  if （note.getId（）>   0 ）
 outState.putLong（Note.COL_ID，note.getId（））; 
} 
 
 @Override 
 受保护  void  onResto reInstanceState（Bundle savedInstanceState）{
 super.onRestoreInstanceState（savedInstanceState）; 
 
  if （savedInstanceState.containsKey（Note.COL_ID））
 note.setId（savedInstanceState.getLong（Note.COL_ID）） ; 
} 
 
 @Override 
 受保护  void  onResume （）{
 super.onResume（）; 
 
  //  加载数据 
  if （note.getId（）>   0 ）
 note.load（db）; 
 
  //  初始化视图 
 reset（）; 
} 
 
 受保护  void  findViews（）{
 categoryBtn =（ImageButton）findViewById（R.id.category_btn）; 
 spinner =（Spinner）findViewById（R.id.spinner）; 
 titleEdit =（EditText）findViewById（R.id.title_et）; 
 contentEdit =（EditText）findViewById（R.id.content_et）; 
 addItemBtn =（ImageButton）findViewById（R.id.additem_btn）; 
 checklistLL =（LinearLayout）findViewById（R.id.checklist_ll）; 
 gallery =（图库）findViewById（R.id.gallery）; 
} 
 
  public   void  onClick（查看v）{
  switch （v.getId（））{
  case  R.id.category_btn ：
 spinner.performClick（）; 
  break ; 
  case  R.id.done_btn：
 finish（）; 
  break ; 
} 
} 
 
 受保护  void  reset（ ）{
 SpinnerAdapter adapter = spinner.getAdapter（）; 
  int  count = adapter.getCount（）; 
  long  categoryId = note.getCategoryId（）> 0？ note.getCategoryId（）：getDefaultCategoryId（）; 
  for （ int  i =  0 ; i< count; >   if （adapter.getItemId（i）== categoryId）{ 
 spinner.setSelection（i）; 
  break ; 
} 
} 
 
 titleEdit .setText（note.getTitle（））; 
 contentEdit.setText（note.getContent（））; 
} 
 
  private   long  getDefaultCategoryId（）{
 SpinnerAdapter adapter = spinner.getAdapter（）; 
  int  count = adapter.getCount（）; 
 
  switch （SmartPad.getDefaultCategoryOpt（））{
  case   1 ：
  for （ int  i =  0 ; i < count; >   if （adapter.getItemId（i）== SmartPad.LASTCREATED_CATEGORYID）{
 返回 SmartPad.LASTCREATED_CATEGORYID; 
} 
} 
  break ; 
  case   2 ：
  for （ int  i =  0 ; i< count; >   if （adapter.getItemId（i）== SmartPad.LASTSELECTED_CATEGORYID）{
  return  SmartPad.LASTSELECTED_CATEGORYID; 
} 
} 
  break ; 
} 
 
 返回 SmartPad.PUBLIC_CATEGORYID; 
} 
 
 受保护  void  persist（）{
 note.setTitle（titleEdit.getText（）。toString（））; 
 note.setContent（contentEdit.getText（ ）.toString（））; 
 note.setId（note.persist（db））; 
} 
 
 @Override 
  protected   void  onPaus e（）{
  if （note.getId（）>   0  || canSave（））
 persist（）; 
 super.onPause（）; 
} 
 
  abstract  boolean canSave（）; 
 
}

解决方案

管理活动生命周期 [ ^ ] 

package com.appsrox.smartpad.note;

import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Typeface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.Gallery;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.SimpleCursorAdapter;
import android.widget.Spinner;
import android.widget.SpinnerAdapter;

import com.appsrox.smartpad.R;
import com.appsrox.smartpad.SmartPad;
import com.appsrox.smartpad.model.Category;
import com.appsrox.smartpad.model.Note;

/**
 * @author appsrox.com
 *
 */
abstract class BaseActivity extends Activity {
	
	//private static final String TAG = "BaseActivity";
	
	protected ImageButton categoryBtn;
	protected Spinner spinner;
	protected EditText titleEdit;
	protected EditText contentEdit;
	protected ImageButton addItemBtn;
	protected LinearLayout checklistLL;
	protected Gallery gallery;
	
	protected LayoutInflater inflater;
	protected SQLiteDatabase db;
	protected Note note;
	
	protected Typeface font;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.note);
        findViews();
        
        inflater = getLayoutInflater();
        db = SmartPad.db;
        font = Typeface.createFromAsset(getAssets(), "fonts/OpenSans-Semibold.ttf");
        
        // create instance
        long noteId = getIntent().getLongExtra(Note.COL_ID, 0);
        if (noteId > 0)
        	note = new Note(noteId);
        else
        	note = new Note();
        
		Cursor c = Category.list(db);
		startManagingCursor(c);
		SimpleCursorAdapter adapter = new SimpleCursorAdapter(
				this, 
				android.R.layout.simple_spinner_item, 
				c, 
				new String[]{Category.COL_NAME}, 
				new int[]{android.R.id.text1});
		adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
		spinner.setAdapter(adapter);        

        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
			public void onItemSelected(AdapterView				note.setCategoryId(id);
				SmartPad.LASTSELECTED_CATEGORYID = id;
			}

			public void onNothingSelected(AdapterView			}
		});		
    }
    
	@Override
	protected void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		
		if (note.getId() > 0)
			outState.putLong(Note.COL_ID, note.getId());
	}	

	@Override
	protected void onRestoreInstanceState(Bundle savedInstanceState) {
		super.onRestoreInstanceState(savedInstanceState);
		
		if (savedInstanceState.containsKey(Note.COL_ID))
			note.setId(savedInstanceState.getLong(Note.COL_ID)); 
	}

	@Override
	protected void onResume() {
		super.onResume();
		
		// load data
		if (note.getId() > 0)
			note.load(db);
		
		// initialize views
        reset();		
	}

	protected void findViews() {
		categoryBtn = (ImageButton) findViewById(R.id.category_btn);
		spinner = (Spinner) findViewById(R.id.spinner);
		titleEdit = (EditText) findViewById(R.id.title_et);
		contentEdit = (EditText) findViewById(R.id.content_et);
		addItemBtn = (ImageButton) findViewById(R.id.additem_btn);
		checklistLL = (LinearLayout) findViewById(R.id.checklist_ll);
		gallery = (Gallery) findViewById(R.id.gallery);
	}
	
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.category_btn:
			spinner.performClick();
			break;		
		case R.id.done_btn:
			finish();
			break;			
		}
	}
	
	protected void reset() {
		SpinnerAdapter adapter = spinner.getAdapter();
		int count = adapter.getCount();
		long categoryId = note.getCategoryId()>0 ? note.getCategoryId() : getDefaultCategoryId();
		for (int i=0; i<count;>			if (adapter.getItemId(i) == categoryId) {
				spinner.setSelection(i);
				break;
			}
		}
		
		titleEdit.setText(note.getTitle());
		contentEdit.setText(note.getContent());
	}
	
	private long getDefaultCategoryId() {
		SpinnerAdapter adapter = spinner.getAdapter();
		int count = adapter.getCount();
		
		switch(SmartPad.getDefaultCategoryOpt()) {
		case 1:
			for (int i=0; i<count;>				if (adapter.getItemId(i) == SmartPad.LASTCREATED_CATEGORYID) {
					return SmartPad.LASTCREATED_CATEGORYID;
				}			
			}			
			break;
		case 2:
			for (int i=0; i<count;>				if (adapter.getItemId(i) == SmartPad.LASTSELECTED_CATEGORYID) {
					return SmartPad.LASTSELECTED_CATEGORYID;
				}			
			}			
			break;			
		}

		return SmartPad.PUBLIC_CATEGORYID;
	}
	
	protected void persist() {
		note.setTitle(titleEdit.getText().toString());
		note.setContent(contentEdit.getText().toString());
		note.setId(note.persist(db));
	}
	
	@Override
	protected void onPause() {
		if (note.getId() > 0 || canSave())
			persist();
		super.onPause();
	}
	
	abstract boolean canSave();

}

解决方案

Managing the Activity Lifecycle[^]


这篇关于我想像一个应用程序创建保持applcation的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

查看全文
相关文章
其他开发语言最新文章
热门教程
热门工具
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆