如何獲取選定列表視圖項中的id以打開contextmenu和意圖通過下一個活動。

Question

listview項目longpress打開contextmenu並執行3選項查看，編輯，刪除。視圖是點擊比獲得ID到選定的項目在列表視圖和意圖通過下一個活動...... ????

我告訴ü代碼...

Broker_Management.java下面的代碼意圖通傳下一個活動不是通過putextra值（長按選擇項ID）..和下一個活動是開放的（Broker_Details_View。 JAVA）比getextra得到的值id獲取數據到sqlite的...

 

    public class Broker_Management extends ListActivity implements OnClickListener { 

     ListAdapter adapter; 
     DBUtil db; 
     Button btn_add_broker,btn_back; 
     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      // TODO Auto-generated method stub 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.broker_management); 

      //CREATE A DATABASE 
      db=new DBUtil(Broker_Management.this); 

      broker_list_display();  

      btn_add_broker=(Button) findViewById(R.id.btn_add_broker); 
      btn_back=(Button) findViewById(R.id.btn_back);   
      btn_add_broker.setOnClickListener(this); 
      btn_back.setOnClickListener(this); 
     } 

     public void onClick(View arg0) { 
      switch (arg0.getId()){ 
      case R.id.btn_add_broker: 
       startActivity(new Intent(Broker_Management.this,Add_New_Broker.class)); 
      break; 
      case R.id.btn_back: 
       Intent goback = new Intent(Broker_Management.this, Admin_Home.class); 
       startActivity(goback);   
      break;   
      } 
     } 

     public void broker_list_display(){ 
      Cursor c; 
      db.open(); 
      String[] from = new String[]{"broker_name","city"}; 
      int[] to = new int[] {R.id.broker_name,R.id.broker_city}; 
      c=db.get_broker_list(); 
      //String[] columns = new String[]{c.getColumnName(1),c.getColumnName(2)}; 
      adapter=new SimpleCursorAdapter(Broker_Management.this, R.layout.itemlist, c, from, to); 
      setListAdapter(adapter); 
      db.close(); 
      registerForContextMenu(getListView()); 
     } 

     public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { 
      super.onCreateContextMenu(menu, v, menuInfo); 
      menu.setHeaderTitle("Context Menu"); 
      MenuInflater inflater = getMenuInflater(); 
      inflater.inflate(R.menu.broker_context_menu, menu); 
     } 

     public boolean onContextItemSelected(MenuItem item) { 
      AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo(); 
      Cursor cursor; 
      switch(item.getItemId()) { 
      case R.id.view: 
       Toast.makeText(this, "View is Peform", Toast.LENGTH_SHORT).show(); 
      Intent intentview = new Intent(Broker_Management.this, Broker_Details_View.class); 
       cursor = (Cursor) adapter.getItem(info.position); 
       intentview.putExtra("KEY_1", cursor.getInt(cursor.getColumnIndex("_id"))); 
       startActivity(intentview); 
       return true; 
      case R.id.update: 
       Toast.makeText(this, "Update is Perform", Toast.LENGTH_SHORT).show(); 
       Intent intentupdate = new Intent(Broker_Management.this, Broker_Details_Update.class); 
       cursor = (Cursor) adapter.getItem(info.position); 
       intentupdate.putExtra("KEY_1", cursor.getInt(cursor.getColumnIndex("_id"))); 
       startActivity(intentupdate);    
       return true; 
      case R.id.delete: 
       Toast.makeText(this, "Delete Activity Perform", Toast.LENGTH_SHORT).show(); 
       Intent intentdelete = new Intent(Broker_Management.this, Broker_Details_Update.class); 
       cursor = (Cursor) adapter.getItem(info.position); 
       intentdelete.putExtra("KEY_1", cursor.getInt(cursor.getColumnIndex("_id"))); 
       startActivity(intentdelete); 
       return true; 
      default: 
       return super.onContextItemSelected(item); 
      } 
     } 
    } 

Broker_Details_View.java

 

    public class Broker_Details_View extends Activity { 
     int id; 
     DBUtil db; 
     TextView tv_broker_name,tv_city, tv_contact_no, tv_email_id, tv_broker_login_id, tv_joining_date; 
     Button btn_update, btn_delete, btn_close, btn_menu, btn_back; 
     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      // TODO Auto-generated method stub 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.broker_details_view); 
     /* 
      id=getIntent().getIntExtra("KEY_1", 0); 
      db=new DBUtil(Broker_Details_View.this); 

      tv_broker_name = (TextView) findViewById(R.id.tv_broker_name); 
      tv_city = (TextView) findViewById(R.id.tv_city); 
      tv_contact_no = (TextView) findViewById(R.id.tv_contact_no); 
      tv_email_id = (TextView) findViewById(R.id.tv_email_id); 
      tv_joining_date = (TextView) findViewById(R.id.tv_joining_id); 

      db.open(); 
      Cursor c = db.get_broker_details(id); 
      if(c.getCount() == 1){ 
       c.moveToFirst(); 
       tv_broker_name.setText(c.getString(c.getColumnIndex("broker_name"))); 
       tv_city.setText(c.getString(c.getColumnIndex("city"))); 
       tv_contact_no.setText(c.getString(c.getColumnIndex("contact_no"))); 
       tv_email_id.setText(c.getString(c.getColumnIndex("email_id"))); 
       tv_broker_login_id.setText(c.getString(c.getColumnIndex("join_date")));  
      } 
      db.close();  */ 
     } 
    } 

DBUtil.java

 

    package com.me.DBUtil; 

    import java.util.Date; 
    import android.app.Activity; 
    import android.content.ContentValues; 
    import android.content.Context; 
    import android.database.Cursor; 
    import android.database.sqlite.SQLiteDatabase; 
    import android.database.sqlite.SQLiteOpenHelper; 
    import android.text.format.DateFormat; 

    public class DBUtil extends Activity { 

     private static final String DATABASE_NAME = "EMS"; 
     private static final int DATABASE_VERSION = 1; 

     //BROKER table content 
     private static final String DBTABLE_BROKER = "Broker"; 
     private static final String B_BROKER_ID = "_id"; 
     private static final String B_LOGIN_ID = "login_id"; 
     private static final String B_BROKER_NAME = "broker_name"; 
     private static final String B_ADDRESS = "address"; 
     private static final String B_CITY = "city"; 
     private static final String B_CONTACT_NO = "contact_no"; 
     private static final String B_EMAIL_ID = "email_id"; 
     private static final String B_DOB = "dob"; 
     private static final String B_AVTAR = "avtar"; 
     private static final String B_JOIN_DATE = "join_date"; 

     public Cursor get_broker_list() { 
      String[] columns =new String[]{B_BROKER_ID,B_BROKER_NAME,B_CITY}; 
      Cursor c =ourDatabase.query(DBTABLE_BROKER, columns, null, null, null, null, null); 
      return c;  
     } 

     public Cursor get_broker_details(int id) { 
      String[] columns =new String[]{B_BROKER_ID,B_BROKER_NAME,B_CITY,B_CONTACT_NO,B_EMAIL_ID,B_JOIN_DATE}; 
      String con=""+ B_BROKER_ID + "=" + id; 
      Cursor c =ourDatabase.query(DBTABLE_BROKER, columns, con, null, null, null, null); 
      return c; 
     } 

PLZ解決這個問題，如何讓在選擇列表視圖項的ID打開文本菜單和意圖直通通過接下來的活動...... ???????

Answer 1

將onItemClickListener設置爲列表。

getListView().setOnItemClickListener(new OnItemClickListener() { 

     @Override 
     public void onItemClick(AdapterView<?> arg0, View arg1, int position, 
       long arg3) { 
      // TODO Auto-generated method stub 

          //open the context menu for the position 
          //to pass to the intent, retrive the value for the position from the cursor and pass it to the intent. 

     } 


    });