将 ListView 项目 onclick 解析为另一个活动并匹配来自 JSON 的特定数据

Question

任何人都可以帮助我将点击时的 ListView 项解析为另一个活动，最好是一个能够获取解析后的 id 并将其与一些 JSON 数据匹配的活动。我正在开发一个 volley 库，并且肯定希望获得点击的特定项目的相关数据。

        // Called when the activity is first created.
    @Override
    public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            LinkedList<String> mLinked = new LinkedList<String>();
            for (int i = 0; i < DRUGS.length; i++) {
                    mLinked.add(DRUGS[i]);
            }

            setListAdapter(new MyListAdaptor(this, mLinked));

            ListView lv = getListView();
            lv.setFastScrollEnabled(true);

            lv.setOnItemClickListener(new OnItemClickListener() {
                    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                            // When clicked, show a toast with the TextView text
                            Toast.makeText(getApplicationContext(), ((TextView) view).getText(), Toast.LENGTH_SHORT).show();

                            // Start new intent by passing value
                            // End intent
                    }

            });
       }

我需要在其他活动中看到我的价值

public class Activity2_view extends Activity {

// 从 MainActivity 类中收集值 TextView tvView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_result);

    tvView = (TextView) findViewById(R.id.tvView);
    Intent intent = getIntent();

    String ItemName = intent.getStringExtra("jsonId");

    tvView.setText("Your drug name is: "  + ItemName);
}

}

Answer 1

在您的适配器中，在您的 getView() 方法中，您可以设置一个标签来匹配您需要链接的 JSON 数据的 id。例如：

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    int jsonId;  // Set the view's tag to the ID of the JSON data
                 // you want to link it to.
    convertView.setTag(jsonId);
}

那么，在你的OnItemClickListener：

ListView lv = getListView();
lv.setFastScrollEnabled(true);

lv.setOnItemClickListener(new OnItemClickListener() {
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        // When clicked, show a toast with the TextView text
        Toast.makeText(getApplicationContext(), ((TextView) view).getText(), Toast.LENGTH_SHORT).show();

        // Get the id from the view.
        int jsonId = (int) view.getTag();

        // Start new intent by passing value
        Intent newActivityIntent = new Intent(YourActivity.this, YourNewActivity.class);
        newActivityIntent.putExtra("jsonId", jsonId);

        // Start it.
        startActivity(newActivityIntent);
    }
});

如果您在getView() 方法中使用ViewHolder 进行优化，则ViewHolder 将成为您视图的标签。您需要向 ViewHolder 对象添加一个成员属性，您可以使用它来保存 id。

public class ViewHolder {
    private int mJsonId;
    private TextView mTextView;

    public void setId(int id) {
        mJsonId = id;
    }

    public int getJsonId() {
        return mJsonId;
    }
}

然后

ViewHolder viewHolder = (ViewHolder) view.getTag();
int jsonId = viewHolder.getJsonId();

希望这会有所帮助。

Answer 2

根据我对您的代码的理解...

String stringId = mLinked.get(position);

Intent mIntent = new Intent(this,Activity2.class);
mIntent.putExtra(KEY,stringId)
startActivity(mIntent);

Answer 3

lv.setOnItemClickListener(new OnItemClickListener() {
                    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    // When clicked, show a toast with the TextView text
                            Toast.makeText(getApplicationContext(), ((TextView) view).getText(), Toast.LENGTH_SHORT).show();
                            // Start a new intent - get the id from the view and send to another activity for JSON
                            // selected item
                            String product = ((TextView) view).getText().toString();

                            // Launching new Activity on selecting single List Item
                            Intent i = new Intent(getApplicationContext(), DrugIndexing_view.class);
                            // sending data to new activity
                            i.putExtra("product", product);
                            startActivity(i);
                            // End intent
                    }

            });