Question

我试图在OnPostExecute中使用else if语句，所以当点击一个按钮时会下载带有数据的API，从String源文件中获取一个正确的标题（在本例中为Honda或Suzuki），它们都放在一个包中并转移到另一项活动。然后标题用作我的DisplayDataActivity上的标题，数据被放入TextView。所以我使用相同的活动来显示我的数据，只是使用不同的标题和数据。总共有20个按钮，但是一旦我知道如何获得其中两个按钮，我将把它扩展到其余的按钮。但是我无法在OnPostExecute中传递我的按钮ID（所以我可以根据点击的按钮id选择正确的else_if语句）。有没有办法做到这一点？我会非常感谢任何帮助！

！更新代码：

public class MainActivity extends AppCompatActivity {

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

}

public class Wrap
{
    public String dataPassedInOnClick;
    public String resultData;
}

public class JSONTask extends AsyncTask<String, String, Wrap> {
    private Context mContext;
    private View rootView;
    ProgressDialog pDialog;
    JSONTask(Context mContext) {
        this.mContext = mContext;
    }

    public JSONTask(Context context, View rootView){
        this.mContext=context;
        this.rootView=rootView;
    }

    @Override
    protected Wrap doInBackground(String... params) {
        HttpURLConnection connection = null;
        BufferedReader reader = null;

        try {
            URL url = new URL(params[0]);
            connection = (HttpURLConnection) url.openConnection();
            connection.connect();

            InputStream stream = connection.getInputStream();
            reader = new BufferedReader(new InputStreamReader(stream));
            StringBuffer buffer = new StringBuffer();
            String line = "";

            while ((line = reader.readLine()) != null) {
                buffer.append(line);
            }

            Wrap wrapper=new Wrap();
            wrapper.dataPassedInOnClick=params[0];
            wrapper.resultData=buffer.toString();

            return wrapper;


        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                connection.disconnect();
            }
            try {
                if (reader != null) {
                    reader.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    @Override
    protected void onPreExecute(){
        pDialog = new ProgressDialog(MainActivity.this);
        pDialog.setMessage("Loading data...");
        pDialog.show();
    }
    protected void onPostExecute(Wrap wrapResult) {
        super.onPostExecute(wrapResult);
        this.pDialog.dismiss();

        if (wrapResult.dataPassedInOnClick.contains("api_suzuki")) {
            String activity_title =
                    getResources().getString(R.string.suzuki);
            Intent intent = new Intent(MainActivity.this,
                    DisplayDataActivity.class);
            Bundle extras = new Bundle();
            extras.putString("title", activity_title);
            extras.putString("JSON_Object", wrapResult.resultData);
            intent.putExtras(extras);
            startActivity(intent);
        }
        else if (wrapResult.dataPassedInOnClick.contains("api_honda")) {
            String activity_title =
                    getResources().getString(R.string.honda);
            Intent intent = new Intent(MainActivity.this,
                    DisplayDataActivity.class);
            Bundle extras = new Bundle();
            extras.putString("title", activity_title);
            extras.putString("JSON_Object", wrapResult.resultData);
            intent.putExtras(extras);
            startActivity(intent);
        }
        else if (wrapResult.dataPassedInOnClick.contains("api_kawasaki")) {
            String activity_title =
                    getResources().getString(R.string.kawasaki);
            Intent intent = new Intent(MainActivity.this,
                    DisplayDataActivity.class);
            Bundle extras = new Bundle();
            extras.putString("title", activity_title);
            extras.putString("JSON_Object", wrapResult.resultData);
            intent.putExtras(extras);
            startActivity(intent);
        }
        else if (wrapResult.dataPassedInOnClick.contains("api_triumph")) {
            String activity_title =
                    getResources().getString(R.string.triumph);
            Intent intent = new Intent(MainActivity.this,
                    DisplayDataActivity.class);
            Bundle extras = new Bundle();
            extras.putString("title", activity_title);
            extras.putString("JSON_Object", wrapResult.resultData);
            intent.putExtras(extras);
            startActivity(intent);
        }
        else if (wrapResult.dataPassedInOnClick.contains("api_bmw")) {
            String activity_title =
                    getResources().getString(R.string.bmw);
            Intent intent = new Intent(MainActivity.this,
                    DisplayDataActivity.class);
            Bundle extras = new Bundle();
            extras.putString("title", activity_title);
            extras.putString("JSON_Object", wrapResult.resultData);
            intent.putExtras(extras);
            startActivity(intent);
        }
        else if (wrapResult.dataPassedInOnClick.contains("api_hyousung")) {
            String activity_title =
                    getResources().getString(R.string.hyousung);
            Intent intent = new Intent(MainActivity.this,
                    DisplayDataActivity.class);
            Bundle extras = new Bundle();
            extras.putString("title", activity_title);
            extras.putString("JSON_Object", wrapResult.resultData);
            intent.putExtras(extras);
            startActivity(intent);
        }
        else if (wrapResult.dataPassedInOnClick.contains("api_ducati")) {
            String activity_title =
                    getResources().getString(R.string.ducati);
            Intent intent = new Intent(MainActivity.this,
                    DisplayDataActivity.class);
            Bundle extras = new Bundle();
            extras.putString("title", activity_title);
            extras.putString("JSON_Object", wrapResult.resultData);
            intent.putExtras(extras);
            startActivity(intent);
        }
        else if (wrapResult.dataPassedInOnClick.contains("api_harley")) {
            String activity_title =
                    getResources().getString(R.string.harley);
            Intent intent = new Intent(MainActivity.this,
                    DisplayDataActivity.class);
            Bundle extras = new Bundle();
            extras.putString("title", activity_title);
            extras.putString("JSON_Object", wrapResult.resultData);
            intent.putExtras(extras);
            startActivity(intent);
        }
        else if (wrapResult.dataPassedInOnClick.contains("api_aprilia")) {
            String activity_title =
                    getResources().getString(R.string.aprilia);
            Intent intent = new Intent(MainActivity.this,
                    DisplayDataActivity.class);
            Bundle extras = new Bundle();
            extras.putString("title", activity_title);
            extras.putString("JSON_Object", wrapResult.resultData);
            intent.putExtras(extras);
            startActivity(intent);
        }
        else if (wrapResult.dataPassedInOnClick.contains("api_ktm")) {
            String activity_title =
                    getResources().getString(R.string.ktm);
            Intent intent = new Intent(MainActivity.this,
                    DisplayDataActivity.class);
            Bundle extras = new Bundle();
            extras.putString("title", activity_title);
            extras.putString("JSON_Object", wrapResult.resultData);
            intent.putExtras(extras);
            startActivity(intent);
        }
        else if (wrapResult.dataPassedInOnClick.contains("api_mv")) {
            String activity_title =
                    getResources().getString(R.string.mv);
            Intent intent = new Intent(MainActivity.this,
                    DisplayDataActivity.class);
            Bundle extras = new Bundle();
            extras.putString("title", activity_title);
            extras.putString("JSON_Object", wrapResult.resultData);
            intent.putExtras(extras);
            startActivity(intent);
        }
        else if (wrapResult.dataPassedInOnClick.contains("api_bajaj")) {
            String activity_title =
                    getResources().getString(R.string.bajaj);
            Intent intent = new Intent(MainActivity.this,
                    DisplayDataActivity.class);
            Bundle extras = new Bundle();
            extras.putString("title", activity_title);
            extras.putString("JSON_Object", wrapResult.resultData);
            intent.putExtras(extras);
            startActivity(intent);
        }
        else if (wrapResult.dataPassedInOnClick.contains("royal")) {
            String activity_title =
                    getResources().getString(R.string.royal);
            Intent intent = new Intent(MainActivity.this,
                    DisplayDataActivity.class);
            Bundle extras = new Bundle();
            extras.putString("title", activity_title);
            extras.putString("JSON_Object", wrapResult.resultData);
            intent.putExtras(extras);
            startActivity(intent);
        }
        else if (wrapResult.dataPassedInOnClick.contains("api_hero")) {
            String activity_title =
                    getResources().getString(R.string.hero);
            Intent intent = new Intent(MainActivity.this,
                    DisplayDataActivity.class);
            Bundle extras = new Bundle();
            extras.putString("title", activity_title);
            extras.putString("JSON_Object", wrapResult.resultData);
            intent.putExtras(extras);
            startActivity(intent);
        }
        else if (wrapResult.dataPassedInOnClick.contains("api_indian")) {
            String activity_title =
                    getResources().getString(R.string.indian);
            Intent intent = new Intent(MainActivity.this,
                    DisplayDataActivity.class);
            Bundle extras = new Bundle();
            extras.putString("title", activity_title);
            extras.putString("JSON_Object", wrapResult.resultData);
            intent.putExtras(extras);
            startActivity(intent);
        }
    }
}
public void onSuzuki(View view) {
    JSONTask objJSONTask=new JSONTask(MainActivity.this);
    objJSONTask.execute("api_suzuki");
}
public void onHonda(View view) {
    JSONTask objJSONTask=new JSONTask(MainActivity.this);
    objJSONTask.execute("api_honda");
}

public void onKawasaki(View view) {
    JSONTask objJSONTask=new JSONTask(MainActivity.this);
    objJSONTask.execute("api_kawasaki");
}
public void onTriumph(View view) {
    JSONTask objJSONTask=new JSONTask(MainActivity.this);
    objJSONTask.execute("api_triumph");
}

public void onBmw(View view) {
    JSONTask objJSONTask=new JSONTask(MainActivity.this);
    objJSONTask.execute("api_bmw");
}
public void onHyuosung(View view) {
    JSONTask objJSONTask=new JSONTask(MainActivity.this);
    objJSONTask.execute("api_hyuosung");
}
public void onDucati(View view) {
    JSONTask objJSONTask=new JSONTask(MainActivity.this);
    objJSONTask.execute("api_ducati");
}
public void onHarley(View view) {
    JSONTask objJSONTask=new JSONTask(MainActivity.this);
    objJSONTask.execute("api_harley");
}
public void onAprilia(View view) {
    JSONTask objJSONTask=new JSONTask(MainActivity.this);
    objJSONTask.execute("api_aprilia");
}
public void onKtm(View view) {
    JSONTask objJSONTask=new JSONTask(MainActivity.this);
    objJSONTask.execute("api_ktm");
}
public void onMv(View view) {
    JSONTask objJSONTask=new JSONTask(MainActivity.this);
    objJSONTask.execute("api_mv");
}
public void onBajaj(View view) {
    JSONTask objJSONTask=new JSONTask(MainActivity.this);
    objJSONTask.execute("api_bajaj");
}
public void onRoyal(View view) {
    JSONTask objJSONTask=new JSONTask(MainActivity.this);
    objJSONTask.execute("api_royal");
}
public void onHero(View view) {
    JSONTask objJSONTask=new JSONTask(MainActivity.this);
    objJSONTask.execute("api_hero");
}
public void onIndian(View view) {
    JSONTask objJSONTask=new JSONTask(MainActivity.this);
    objJSONTask.execute("api_indian");
}

Answer 1

你正在为onPostExecute中的每个案例传递和获取rootView，当你试图通过调用int id = view.getId ();来获取id时，你实际上每次都获得了rootView的id，所以你必须通过查看每个按钮或找出另一种方法。

在这种情况下你可以做的是比较你在onClick方法中传递的字符串，因为你已经为每个案例传递了一个不同的字符串，你已经知道从哪里调用你的{{1方法，所以你不需要按下按钮的视图，因为它是多余的。

试试这个：

JSONTask

我们必须定义一个Wrap类，因为public class Wrap { public String dataPassedInOnClick; public String resultData; } public class JSONTask extends AsyncTask<String, String, Wrap> { private Context mContext; private View rootView; ProgressDialog pDialog; JSONTask(Context mContext) { this.mContext = mContext; } public JSONTask(Context context, View rootView){ this.mContext=context; this.rootView=rootView; } @Override protected Wrap doInBackground(String... params) { HttpURLConnection connection = null; BufferedReader reader = null; try { URL url = new URL(params[0]); connection = (HttpURLConnection) url.openConnection(); connection.connect(); InputStream stream = connection.getInputStream(); reader = new BufferedReader(new InputStreamReader(stream)); StringBuffer buffer = new StringBuffer(); String line = ""; while ((line = reader.readLine()) != null) { buffer.append(line); } Wrap wrapper=new Wrap(); wrapper.dataPassedInOnClick=params[0]; wrapper.resultData=buffer.toString(); return wrapper; } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (connection != null) { connection.disconnect(); } try { if (reader != null) { reader.close(); } } catch (IOException e) { e.printStackTrace(); } } return null; } @Override protected void onPreExecute(){ pDialog = new ProgressDialog(MainActivity.this); pDialog.setMessage("Loading data..."); pDialog.show(); } protected void onPostExecute(Wrap wrapResult) { super.onPostExecute(wrapResult); this.pDialog.dismiss(); if (wrapResult.dataPassedInOnClick.contains("Honda") || wrapResult.dataPassedInOnClick.contains("honda")) { String activity_title = getResources().getString(R.string.Honda); Intent intent = new Intent(MainActivity.this, DisplayDataActivity.class); Bundle extras = new Bundle(); extras.putString("title", activity_title); extras.putString("JSON_Object", wrapResult.resultData); intent.putExtras(extras); startActivity(intent); } else if (wrapResult.dataPassedInOnClick.contains("Suzuki") || wrapResult.dataPassedInOnClick.contains("suzuki")) { String activity_title = getResources().getString(R.string.Suzuki); Intent intent = new Intent(MainActivity.this, DisplayDataActivity.class); Bundle extras = new Bundle(); extras.putString("title", activity_title); extras.putString("JSON_Object", wrapResult.resultData); intent.putExtras(extras); startActivity(intent); } } }方法只能返回一个对象。

OnPostExecute中的按钮ID

1 个答案: