Question

我有两个按钮，分别是erton，atrape，smiders，imbecil，billetes和tonto，我想做的例子：我想从片段Frag1中按下按钮offerton，然后启动MainActivity中的媒体播放器momo1 我知道这是错误的，但是我想知道当我从Fragment中按下按钮时如何从MainActivity启动Media Player。

这是MainActivity

package com.example.mauri.miapp;

import android.media.MediaPlayer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.FrameLayout;

public class MainActivity extends AppCompatActivity {
  public MediaPlayer momo1;
  public MediaPlayer momo2;
  public MediaPlayer momo3;
  public MediaPlayer momo4;
  public MediaPlayer momo5;
  public MediaPlayer momo6;
  Frag1 f1;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);
     f1 = new Frag1();
     momo1 = MediaPlayer.create(this, R.raw.oferton);
     momo2 = MediaPlayer.create(this, R.raw.atrape);
     momo3 = MediaPlayer.create(this, R.raw.smiders);
     momo4 = MediaPlayer.create(this, R.raw.imbecil);
     momo5 = MediaPlayer.create(this, R.raw.billetes);
     momo6 = MediaPlayer.create(this, R.raw.tonto);
     android.app.FragmentManager manager = getFragmentManager();
     manager.beginTransaction().replace(R.id.LayoutContenedor, f1).commit();
  }

}

这是我的片段：Frag1

package com.example.mauri.miapp;

import android.app.Activity;
import android.os.Bundle;
import android.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;

public class Frag1 extends Fragment {
    public Frag1() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        Log.i("fragmento01", "onCreateView");
        View vista = inflater.inflate(R.layout.fragment_frag1, container, false);

        ImageButton oferton = vista.findViewById(R.id.btn_oferton);
        ImageButton atrape = vista.findViewById(R.id.btn_atrape);
        ImageButton smiders = vista.findViewById(R.id.btn_smiders);
        ImageButton imbecil = vista.findViewById(R.id.btn_imbecil);
        ImageButton billetes = vista.findViewById(R.id.btn_billetes);
        ImageButton tonto = vista.findViewById(R.id.btn_tonto);

\\This is bad, but is a Example for what i whant to do
        oferton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                momo1.seekTo(0);
                momo1.start();
            }
        });
        atrape.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                momo2.seekTo(0);
                momo2.start();
            }
        });
        smiders.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                momo3.seekTo(0);
                momo3.start();
            }
        });
        imbecil.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                momo4.seekTo(0);
                momo4.start();
            }
        });
        billetes.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                momo5.seekTo(0);
                momo5.start();
            }
        });
        tonto.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                momo6.seekTo(0);
                momo6.start();
            }
        });

        return vista;
    }

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.i("fragmento01", "onCreate");

    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        Log.i("fragmento01", "onAttach");
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        Log.i("fragmento01", "onActivityCreated");
    }

    @Override
    public void onViewStateRestored(Bundle savedInstanceState) {
        super.onViewStateRestored(savedInstanceState);
        Log.i("fragmento01", "onViewStateRestored");
    }

    @Override
    public void onStart() {
        super.onStart();
        Log.i("fragmento01", "onStart");
    }

    @Override
    public void onResume() {
        super.onResume();
        Log.i("fragmento01", "onResume");
    }

    @Override
    public void onPause() {
        super.onPause();
        Log.i("fragmento01", "onPause");
    }

    @Override
    public void onStop() {
        super.onStop();
        Log.i("fragmento01", "onStop");
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        Log.i("fragmento01", "onDestroyView");
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.i("fragmento01", "Destroy");
    }

    @Override
    public void onDetach() {
        super.onDetach();
        Log.i("fragmento01", "onDetach");
    }

}

Answer 1

您可以在活动中创建一个公共方法，该方法将启动媒体播放器并像这样从片段中调用该方法，

((MainActivity)getActivity()).playMediaPlayer();

Answer 2

在“主要活动”中创建方法

    public void playSong(String runninsong) {          
           if(player.isplaying()){
             player.stop();
            player.release();}
           int resID=getResources().getIdentifier(runningsong, "raw", 
             getPackageName());
               player.prepare();
       MediaPlayer mediaPlayer=MediaPlayer.create(this,resID);
                    mediaPlayer.start();
}

，然后在单击按钮的片段中

首先创建一个主要活动对象

MainActivity mainActivity




 oferton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {     
mainActivity = new MainActivity();                          
                mainActivity.playSong("oferton"); //You need to pass ID of the audio file
            }
        });

Answer 3

我的主要活动公共职能：

public void showToastMessage(String message) {
    Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}

这就是我在片段中使用的方式：

assert (getActivity()) != null;
((SXBaseDrawerActivity) getActivity()).showToastMessage(string);

如果您使用的是OnClick按钮，您可以这样做：

Button btn = findViewById(R.id.yout_btn);
btn.OnClickViewCompensation((v) -> {
    assert (getActivity()) != null;
((SXBaseDrawerActivity) getActivity()).showToastMessage(string);
});

注意：例如，我使用了吐司方法，您可以使用自己的功能。

当我从片段按按钮时如何从MainActivity启动Media Player

3 个答案: