Question

每次在ListView上单击某个项目时，我都会尝试启动一个活动我在我的项目中使用数据库并在我的项目中使用全局变量但无法在项目中启动GalleryFileActivity活动如果您需要了解每个部分也将提供感谢您继续努力推进完美

公共类DataListView扩展了ListActivity {

final private ArrayList<String> results = new ArrayList<String>();
private String tableName = DBHelper.tableName;
private SQLiteDatabase newDB;
private String Path;
final private ArrayList<String> pikh = new ArrayList<String>();

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    final global folder = ((global)getApplicationContext());
    openAndQueryDatabase();

    displayResultList();


}
private void displayResultList() {
    TextView tView = new TextView(this);
    tView.setText("data is");
    getListView().addHeaderView(tView);


    setListAdapter(new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, results));

    ListView lstView = getListView();


   lstView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);        
   lstView.setTextFilterEnabled(true);

}
    public void onListItemClick(
            ListView parent, View v, int position,long id, global folder)
            {
        String pos=results.get(position-1);
        super.onListItemClick(parent, v, position, id);
                Toast.makeText(this,
                    "You have selected "  + results.get(position-1) ,
                    Toast.LENGTH_SHORT).show();
                folder.setsubfolder (pos);
            **startActivity(new Intent(this,GalleryFileActivity.class));**
            }

            public void onClick(View view) {
                ListView lstView = getListView();

            }

private void openAndQueryDatabase() {
    try {
        DBHelper dbHelper = new DBHelper(this.getApplicationContext());
        newDB = dbHelper.getWritableDatabase();
        Cursor c = newDB.rawQuery("SELECT Path, Header FROM resource1  " 
                 , null);

        if (c != null ) {
            if  (c.moveToFirst()) {
                do {

                    Path = c.getString(c.getColumnIndex("Path"));
                    String Header = c.getString(c.getColumnIndex("Header"));

                    results.add( Path + "    " + Header);


                }while (c.moveToNext()) ;

            } 
        }           
    } catch (SQLiteException se ) {
        Log.e(getClass().getSimpleName(), "Could not create or Open the database");
    } finally {
        if (newDB != null) 
            newDB.execSQL("DELETE FROM " + tableName);
            newDB.close();
    }

}

}

Answer 1

代码看起来很正确。

听起来你的清单中可能没有宣布GalleryFileActivity。

检查你的logcat输出 - 那里可能有一个例外，提到这个。

通过Listactivity启动活动

1 个答案: