Question

我想在MenuActivity布局中显示一个按钮，但决定if语句是在CapitalReceiver类中。我已经尝试将“静态”添加到各种变量但它不起作用。请帮忙！

import android.support.v4.app.Fragment;
import android.support.v4.content.LocalBroadcastManager;
import android.text.format.DateFormat;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.TextView;

public class MenuActivity extends Activity {

    String status;
    Boolean verified = false;
    String textColour = "#000000";
    TextView mTvCapital;
    ArrayAdapter<String> mAdapter;  
     Intent mServiceIntent;
     CapitalReceiver mReceiver;
     IntentFilter mFilter;
     String country = "7ec47294ff3d8b74";




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

        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
        Button IDButton = (Button) findViewById(R.id.getIt);
        Button RefreshButton = (Button) findViewById(R.id.refresh);
        long updateTimeMillis = System.currentTimeMillis();
        String updateTime = (String) DateFormat.format("hh:mm", updateTimeMillis);

        //If application has been submitted//
        if(preferences.contains("first_middle_store") & !(verified)) {
            status = "Status: Application pending. Last updated: " + updateTime;
            IDButton.setVisibility(View.GONE);
            RefreshButton.setVisibility(View.VISIBLE);
            textColour = "#000000";
        }

        //If application has not been submitted
        else {
            status = "Status: Application not yet submitted";
            IDButton.setVisibility(View.GONE);
            RefreshButton.setVisibility(View.GONE);
            textColour = "#000000";
        }

        TextView text=(TextView)findViewById(R.id.application_status);
        text.setTextColor(Color.parseColor(textColour));
        text.setText(status);

        Button btnNextScreen = (Button) findViewById(R.id.verify);

      //Listening to verify event
              btnNextScreen.setOnClickListener(new View.OnClickListener() {


                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    Intent nextScreen = new Intent(getApplicationContext(), VerifyActivity.class);
                    startActivity(nextScreen);
                }
              });

        Button btnNextScreen2 = (Button) findViewById(R.id.how);

      //Listening to HowItWorks event
              btnNextScreen2.setOnClickListener(new View.OnClickListener() {


                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    Intent nextScreen2 = new Intent(getApplicationContext(), HowItWorksActivity.class);
                    startActivity(nextScreen2);
                }
              });


      //Listening to IDbutton event
        IDButton.setOnClickListener(new View.OnClickListener() {


                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    Intent nextScreen3 = new Intent(getApplicationContext(), IDActivity.class);
                    startActivity(nextScreen3);
                }
              });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }



    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.menu_layout, container, false);
            return rootView;
        }
    }


    public  void refresh(View view) {
        // Getting reference to TextView 
        mTvCapital = (TextView) findViewById(R.id.tv_capital);
        mTvCapital.setText("hello");

        // Creating an intent service
        mServiceIntent = new Intent(getApplicationContext(), CapitalService.class);

        mServiceIntent.putExtra(Constants.EXTRA_ANDROID_ID, country);

        // Starting the CapitalService to fetch the capital of the country
        startService(mServiceIntent);

        // Instantiating BroadcastReceiver
        mReceiver = new CapitalReceiver();

        // Creating an IntentFilter with action
        mFilter = new IntentFilter(Constants.BROADCAST_ACTION);

        // Registering BroadcastReceiver with this activity for the intent filter
        LocalBroadcastManager.getInstance(getApplicationContext()).registerReceiver(mReceiver, mFilter);

    }


    // Defining a BroadcastReceiver
    private static class CapitalReceiver extends BroadcastReceiver{

        @Override
        public void onReceive(Context context, Intent intent) { 

            String capital = intent.getStringExtra(Constants.EXTRA_APPROVAL);

            if(capital == "YES") {

                //status = "Status: Application Approved";//
                //IDButton.setVisibility(View.VISIBLE);//
            }
            else if(capital == "NO"){

                //status = "Status: Application Denied";//

            }


        }       
    }

}

Answer 1

只是浏览一下你的代码，一个可能的解决方案（也许不是最好的）就是让ID Button变量全局化。然后，您将在onCreate中实例化它，同时仍允许在此MenuActivity中的其他类中操作它。我希望这会有所帮助。

我无法显示按钮（可能是静态引用问题）

1 个答案: