Question

我有这个片段用按钮膨胀活动。如何使按钮转到另一个活动或片段？假设按钮1进入地图活动而按钮2进入listfragment

编辑** 我想要的只是一个带有2个按钮的活动，其中一个按钮转到片段

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;


public class MainActivity extends Activity {
static Context context;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //context = getApplicationContext();
        Button test= (Button)findViewById(R.id.testbtn);
        test.setOnClickListener(new View.OnClickListener() 
      {
               public void onClick(View v) 
               {
                   Intent intent = new Intent(MainActivity.this, MyLocation.class);//this works
                   startActivity(intent);

               }
  });

        Button proximityAlert= (Button)findViewById(R.id.alertbtn);
        proximityAlert.setOnClickListener(new View.OnClickListener() 
      {
               public void onClick(View v) 
               {
                   Intent intent = new Intent(MainActivity.this, mfragment.class);//this doesn't work, this class is a fragment list
                   startActivity(intent);

               }
  });


    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

mfragment class

import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import android.support.v4.app.ListFragment;

public class mfragment extends ListFragment {
    String[] cities = {
            "hello",


    };

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setting the adapter to the layout
        setListAdapter(new ArrayAdapter<String>(getActivity(), 
                android.R.layout.simple_list_item_1,
                cities));

    }

    public void onListItemClick(ListView parent, View v, int position, long id) {
        //displays a toest of the selected item in the list 
        //using an array to and using the position of the selected item
        Toast.makeText(getActivity(), 
            "You have selected " + cities[position], 
            Toast.LENGTH_SHORT).show();
        String selectedCity = cities[position];

        /*//cheks if the detailfragment is in the current activity
        DetailFragment detailFragment = (DetailFragment) 
            getFragmentManager().findFragmentById(R.id.detailFragment);


        //---if the detail fragment is not in the current activity as myself---
        if (detailFragment != null && detailFragment.isInLayout()) {
            //---the detail fragment is in the same activity as the master---
            detailFragment.setSelectedCity(selectedCity);
            //calls the method set selected city and sends a string with the selcted city
        } else {
        */
            //---the detail fragment is in its own activity---
            //this is only needed if is in portrait mode
            //starts a new activity and it pass arguments to know
            //which city got selected
            Intent intent = new Intent(getActivity(), DetailActivity.class);
            intent.putExtra("city", selectedCity);
            startActivity(intent);
        //}
    }
}

Answer 1

您需要在正确的布局中指定按钮。如果您希望在活动中有一个按钮，则需要在活动的布局xml文件中指定它。然后，您将从活动的代码中使用它。同样，您需要在片段的xml布局文件中指定要放在片段中的按钮。

您无法混合活动和片段的布局，每个布局都相互独立，并且无法直接相互访问。

Answer 2

我很抱歉这样说，但你离你想要的远很远。请查看此示例：http://developer.android.com/guide/components/fragments.html#Example

片段android中的按钮

2 个答案: