乐学成语案例分析

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<pre name="code" class="html"><pre class="java" name="code">public class StudyActivity extends Activity {      private List<Category> categoryList;      private String[] category_names;      private int[] category_images;      @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_study);          initCategory();//初始化类          CategoryAdapter adapter=new CategoryAdapter(this, R.layout.category_item, categoryList);          ListView listView=(ListView) findViewById(R.id.lvCategories);          listView.setAdapter(adapter);          listView.setOnItemClickListener(new OnItemClickListener() {                @Override              public void onItemClick(AdapterView<?> adapterView, View view, int position,                      long id) {                  // TODO Auto-generated method stub                  Intent intent;                  switch(position){                  case 0:                       intent=new Intent(StudyActivity.this,StudyAnimalActivity.class);                      startActivity(intent);                      break;                  case 6:                       intent=new Intent(StudyActivity.this,StudyOtherActivity.class);                      startActivity(intent);                      break;                      default:                          break;                  }                }          });      }        private void initCategory() {          // TODO Auto-generated method stub          categoryList=new ArrayList<Category>();          Resources resources=getResources();          category_names=resources.getStringArray(R.array.category);          category_images=new int[]{R.drawable.category_animal,                  R.drawable.category_nature,R.drawable.category_human,                  R.drawable.category_season,R.drawable.category_number,                  R.drawable.category_fable,R.drawable.category_other                       };          for(int i=0;i<category_names.length;i++){              categoryList.add(new Category(category_names[i], category_images[i]));                        }                }        @Override      public boolean onCreateOptionsMenu(Menu menu) {          // Inflate the menu; this adds items to the action bar if it is present.          getMenuInflater().inflate(R.menu.study, menu);          return true;      }    }  <img src="http://img.blog.csdn.net/20160615133812641?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" width="310" height="407" alt="" />

    public class DBOpenHelper {          private final int BUFFER_SIZE=400000;//缓冲区大小          public static final String DB_NAME="idioms.db"; //保存的数据库文件名          public static final String PACKAGE_NAME="com.example.happyidiom";//应用的包名          public static final String DB_PATH="/data"          +Environment.getDataDirectory().getAbsolutePath()+"/"          +PACKAGE_NAME+"/databases";//在手机里存放数据库的位置          private Context context;          public DBOpenHelper(Context context){              this.context=context;          }          public SQLiteDatabase openDatabase(){                            try{              File myDataPath=new File(DB_PATH);              if(!myDataPath.exists()){                  myDataPath.mkdirs();//如果没有这个数据库则创建              }              String dbfile=myDataPath+"/"+DB_NAME;              if(!(new File(dbfile).exists())){//判断数据库文件是否存在，若不存在直接导入，                  //否则直接打开数据库                  InputStream is=context.getResources().openRawResource(R.raw.idioms);                  FileOutputStream fos=new FileOutputStream(dbfile);                  byte[] buffer=new byte[BUFFER_SIZE];                  int count=0;                  while((count=is.read(buffer))>0){                      fos.write(buffer, 0,count);                  }                  fos.close();                  is.close();              }              SQLiteDatabase db=SQLiteDatabase.openOrCreateDatabase(dbfile, null);              return db;              }catch(FileNotFoundException e){                  Log.e("Database","File not found");                  e.printStackTrace();              }              catch(IOException e){                  Log.e("Database","IO exception");                  e.printStackTrace();              }                                          return null;          }            }

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