将ListView项目onclick解析为另一个活动，并匹配JSON中的特定数据

Question

任何人都可以帮助我在单击时解析ListView项目到另一个活动，最好是一个活动，该活动将获取解析的ID并将其与一些JSON数据进行匹配。 我正在一个排球库上工作，肯定会希望获得单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
                    }

            });
       }

我需要在另一项活动中展现自己的价值，因为

public class Activity2_view extends Activity {

//从MainActivity类TextView tvView收集值；

@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

在适配器的getView()方法中，可以设置一个标记以匹配需要链接的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);
}

然后，在您的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);
    }
});

如果出于优化目的在getView()方法中使用ViewHolder ，则ViewHolder将成为视图的标记。 您将需要向ViewHolder对象添加一个成员属性，您可以使用该成员属性保存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();

希望这可以帮助。

Answer 2

根据我对您的代码的了解...

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
                    }

            });