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我有一个 ListView，它显示静态数据和图像（比如 Activity A）。当我单击 ListVoew 项目时，数据被捕获并传递到下一个活动（我们称之为活动 B）。在活动 B 中，我想将选定的值传递到 DB select where 子句并获取数据并显示与选择有关的相关信息。这是我的代码片段...

活动一：

String subproduct = ((TextView) view.findViewById(R.id.product_label)).getText().toString();
                      // Launching new Activity on selecting single List Item

                      SharedPreferences sharedPreferences = getSharedPreferences("pref",MODE_WORLD_READABLE);
                      SharedPreferences.Editor editor = sharedPreferences.edit();
                      editor.clear();
                      editor.putString("subproduct", subproduct);
                      editor.commit();
                      Intent myIntent = new Intent(getApplicationContext(),Details.class);                 
                      startActivity(myIntent);

这是我的活动 B：enter code here

public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.details1);

SharedPreferences myPrefs = this.getSharedPreferences("pref", MODE_WORLD_READABLE); 
String subproduct = myPrefs.getString("subproduct","null");     
TextView txtProduct1 = (TextView) findViewById(R.id.detail_item);
txtProduct1.setText(subproduct);

这是我的DBHelper.java。在这里，我想传递选定的值。请帮助我如何实现这一目标...

public Cursor getData(){
        //SharedPreferences myPrefs = this.getSharedPreferences("pref", 0);
        //String subproduct = myPrefs.getString("subproduct","null");
        Cursor c = myDataBase.rawQuery("SELECT * FROM Destmain WHERE destname= " + ? + " ", null);
        while (c.moveToNext()){
            DestInfo q = new DestInfo();
            q.setDestination(c.getString(1));
            q.setCity(c.getString(2));
            q.setCountry(c.getString(3));
            q.setPeriod(c.getString(4));
            q.setType(c.getString(5));
            q.setCurrency(c.getString(6));
            q.setBriefhistory(c.getString(7));
            q.setHighlights(c.getString(8));


        }
        c.close();
        return c;

谁能帮助我如何将 ListView (Activity A) 选择的值传递给获取 DB 数据并在 Activity B 中显示？万分感谢。

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1 回答 1

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By using method onItemcClick in Activity A you can get the Id and pass it to the second Activity B.

onItemClick(AdapterView<?> adapterView, View view, int pos, long id)
newActivity.putExtra("key", id);

then in Activity B you can use this Id to search on the Database.

Intent newActivity = getIntent();
long id = newActivity.getLongExtras("key", -1);

in some other case you can use getLunchDetails method

于 2013-07-19T11:43:23.853 回答