Question

在我的项目中，我使用排球库来获取数据，并根据这些数据我将添加按钮，按钮显示正确，但问题是打开另一个活动不起作用：

RequestQueue requestQueue;
TextView txt;
final int MY_REQ_CODE = 12345;

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

    final GridLayout layout = (GridLayout) findViewById(R.id.layout);
    requestQueue = Volley.newRequestQueue(this.getApplicationContext());

    JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, "url", null,
            new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {
                    try {

                        JSONObject jsonanswer = response.getJSONObject("answer");
                        final String[] name=new String[9];

                        txt = (TextView) findViewById(R.id.name);

                        JSONArray result = jsonanswer.getJSONArray("result");

                        for (int i=0;i<jsonArrayresult.length();i++){
                            JSONObject objresp = result.getJSONObject(i);

                            String name= objresp.getString("name");

                            name[i] = name;
                        }

                        for (int i=0;i<titles.length;i++){
                            Button btn = new Button(getApplicationContext());

                            btn.setText(titles[i]);

                            layout.addView(btn);

                            btn.setOnClickListener(getProducts);
                            btn.setTag(titles[i]);
                        }


                    } catch (JSONException e) {
                        e.printStackTrace();
                    }

                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Log.e("VOLLEY", "ERROR");
                }
            }
    );

    requestQueue.add(jsonObjectRequest);
}

View.OnClickListener getProducts = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Object tag = v.getTag();

        Intent intent = new Intent(getApplicationContext(), otherActivity.class);

        intent.putExtra("name", tag.toString());
        startActivity(intent);
    }
};

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if(requestCode == MY_REQ_CODE) {
        if (resultCode == RESULT_OK) {
            //??

        } else if (resultCode == RESULT_CANCELED){
            Toast.makeText(getApplicationContext(), "Result canceled", Toast.LENGTH_SHORT).show();
        }
    }
}

我的第二项活动是：

 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_products_list);

    setResult(RESULT_OK);
    finish();

    final Intent intent = getIntent();

    final TextView txt = (TextView) findViewById(R.id.txt);

    Bundle title = intent.getExtras();
    if (title != null) {
        str = title.getString("title");
    }

    txt.setText(str);

}

Answer 1

在内部活动之间移动时，您应该使用startActivity(intent)方法而不是startActivityForResult。

变化：

startActivityForResult(intent, MY_REQ_CODE);

要：

startActivity(intent);

<强>更新从我所看到的你还创建了一个名为btn的新按钮，但是你将听众分配给其他按钮。我不知道你在哪里创建 btncategorie 按钮，它应该是：

Button btn = new Button(getApplicationContext());
btn.setText(titles[i]);
btn.setOnClickListener(getProducts);
btn.setTag(titles[i]);
layout.addView(btn);

在活动问题之间传递数据

1 个答案: