android - 按钮链接到开始时的声音

Question

我正在开发一个应用程序，这个应用程序没有任何错误，但是每当我在我的手机上测试它时，当我触摸按钮时应该会有声音，但没有声音。

主要 Activity

    package com.example.user.myapplication;

import android.app.Activity;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.content.Context;
import android.os.Build;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.support.v4.widget.DrawerLayout;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import android.content.Intent;
import android.media.MediaPlayer;
import android.widget.Button;

public class MainActivity extends ActionBarActivity
        implements NavigationDrawerFragment.NavigationDrawerCallbacks {


/**
 * Fragment managing the behaviors, interactions and presentation of the navigation drawer.
 */
private NavigationDrawerFragment mNavigationDrawerFragment;

/**
 * Used to store the last screen title. For use in {@link #restoreActionBar()}.
 */
private CharSequence mTitle;

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

    mNavigationDrawerFragment = (NavigationDrawerFragment)
            getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
    mTitle = getTitle();

    // Set up the drawer.
    mNavigationDrawerFragment.setUp(
            R.id.navigation_drawer,
            (DrawerLayout) findViewById(R.id.drawer_layout));
}

@Override
public void onNavigationDrawerItemSelected(int position) {

    Fragment objFragment = null;

    switch (position) {
        case 0:
            objFragment = new menu1_Fragment();
            break;
        case 1:
            objFragment = new menu2_Fragment();
            break;
        case 2:
            objFragment = new menu3_Fragment();
            break;


    }
    // update the main content by replacing fragments
    FragmentManager fragmentManager = getSupportFragmentManager();
    fragmentManager.beginTransaction()
            .replace(R.id.container, objFragment)
            .commit();
}

public void onSectionAttached(int number) {
    switch (number) {
        case 1:
            mTitle = getString(R.string.title_section1);
            break;
        case 2:
            mTitle = getString(R.string.title_section2);
            break;
        case 3:
            mTitle = getString(R.string.title_section3);
            break;
    }
}

public void restoreActionBar() {
    ActionBar actionBar = getSupportActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
    actionBar.setDisplayShowTitleEnabled(true);
    actionBar.setTitle(mTitle);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    if (!mNavigationDrawerFragment.isDrawerOpen()) {
        // Only show items in the action bar relevant to this screen
        // if the drawer is not showing. Otherwise, let the drawer
        // decide what to show in the action bar.
        getMenuInflater().inflate(R.menu.main, menu);
        restoreActionBar();
        return true;
    }
    return super.onCreateOptionsMenu(menu);
}

@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();

    //noinspection SimplifiableIfStatement
    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 {
    /**
     * The fragment argument representing the section number for this
     * fragment.
     */
    private static final String ARG_SECTION_NUMBER = "section_number";

    /**
     * Returns a new instance of this fragment for the given section
     * number.
     */
    public static PlaceholderFragment newInstance(int sectionNumber) {
        PlaceholderFragment fragment = new PlaceholderFragment();
        Bundle args = new Bundle();
        args.putInt(ARG_SECTION_NUMBER, sectionNumber);
        fragment.setArguments(args);
        return fragment;
    }

    public PlaceholderFragment() {
    }


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

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        ((MainActivity) activity).onSectionAttached(
                getArguments().getInt(ARG_SECTION_NUMBER));
    }
}


protected void onStart(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    {
        setContentView(R.layout.activity_main);


        final MediaPlayer intromp = MediaPlayer.create(this, R.raw.intro);

        Button intro = (Button) this.findViewById(R.id.intro);
        intro.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (intromp.isPlaying()) {
                    intromp.seekTo(0);
                } else {
                    intromp.start();
                }
            }
        });

        final MediaPlayer holyshitmp = MediaPlayer.create(this, R.raw.holyshit);

        final Button holyshit = (Button) this.findViewById(R.id.holyshit);
        holyshit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (holyshitmp.isPlaying()) {
                    holyshitmp.seekTo(0);
                } else {
                    holyshitmp.start();
                }
            }
        });

        final MediaPlayer limberthanwatermp = MediaPlayer.create(this, R.raw.limberthanwater);

        Button limberthanwater = (Button) this.findViewById(R.id.limberthanwater);
        limberthanwater.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (limberthanwatermp.isPlaying()) {
                    limberthanwatermp.seekTo(0);
                } else {
                    limberthanwatermp.start();
                }
            }
        });

        final MediaPlayer sandpapernipplwsmp = MediaPlayer.create(this, R.raw.sandpapernipples);

        Button sandpapernipples = (Button) this.findViewById(R.id.sandpapernipples);
        sandpapernipples.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (sandpapernipplwsmp.isPlaying()) {
                    sandpapernipplwsmp.seekTo(0);
                } else {
                    sandpapernipplwsmp.start();
                }
            }
        });

        final MediaPlayer raisemyweinermp = MediaPlayer.create(this, R.raw.raisingmyweiner);

        Button raisemyweiner = (Button) this.findViewById(R.id.raisemyweiner);
        raisemyweiner.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (raisemyweinermp.isPlaying()) {
                    raisemyweinermp.seekTo(0);
                } else {
                    raisemyweinermp.start();
                }
            }
        });

        final MediaPlayer alientacklesatreemp = MediaPlayer.create(this, R.raw.alientacklesatree);

        final Button alientacklesatree = (Button) this.findViewById(R.id.alientacklesatree);
        alientacklesatree.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (alientacklesatreemp.isPlaying()) {
                    alientacklesatreemp.seekTo(0);
                } else {
                    alientacklesatreemp.start();
                }
            }
        });

        final MediaPlayer nipplerubbermp = MediaPlayer.create(this, R.raw.nipplerubber);

        Button nipplerubber = (Button) this.findViewById(R.id.nipplerubber);
        nipplerubber.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (nipplerubbermp.isPlaying()) {
                    nipplerubbermp.seekTo(0);
                } else {
                    nipplerubbermp.start();
                }
            }
        });

        final MediaPlayer shittalkmp = MediaPlayer.create(this, R.raw.shittalk);

        Button shittalk = (Button) this.findViewById(R.id.shittalk);
        shittalk.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (shittalkmp.isPlaying()) {
                    shittalkmp.seekTo(0);
                } else {
                    shittalkmp.start();
                }
            }
        });
    }
}

Activity 主体

<!-- A DrawerLayout is intended to be used as the top-level content view using match_parent for both width and height to consume the full space available. -->

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:id = "@+id/container">
<!--Note for Ryan, id Container is needed because it will not display the navigation menu aka the container-->

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/intro"
            android:layout_width="185dp"
            android:layout_height="wrap_content"
            android:text="Intro"
            android:singleLine="true"/>
        <Button
            android:id="@+id/holyshit"
            android:layout_width="193dp"
            android:layout_height="wrap_content"
            android:text="Holy shit"
            android:singleLine="true"/>
    </LinearLayout>

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <Button
        android:id="@+id/limberthanwater"
        android:layout_width="185dp"
        android:layout_height="wrap_content"
        android:text="Limber Than Water"
        android:singleLine="true"/>
    <Button
        android:id="@+id/sandpapernipples"
        android:layout_width="193dp"
        android:layout_height="wrap_content"
        android:text="Sandpaper Nipples"
        android:singleLine="true"/>
</LinearLayout>

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <Button
        android:id="@+id/raisemyweiner"
        android:layout_width="185dp"
        android:layout_height="wrap_content"
        android:text="Raise My Weiner"
        android:singleLine="true"/>
    <Button
        android:id="@+id/alientacklesatree"
        android:layout_width="193dp"
        android:layout_height="wrap_content"
        android:text="Alien tacking a tree"
        android:singleLine="true"/>
</LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/nipplerubber"
            android:layout_width="185dp"
            android:layout_height="wrap_content"
            android:text="Nipple Rubber"
            android:singleLine="true"/>
        <Button
            android:id="@+id/shittalk"
            android:layout_width="193dp"
            android:layout_height="wrap_content"
            android:text="Shit Talk"
            android:singleLine="true"/>
    </LinearLayout>


</LinearLayout>
</ScrollView>





<!-- android:layout_gravity="start" tells DrawerLayout to treat
     this as a sliding drawer on the left side for left-to-right
     languages and on the right side for right-to-left languages.
     If you're not building against API 17 or higher, use
     android:layout_gravity="left" instead. -->
<!-- The drawer is given a fixed width in dp and extends the full height of
     the container. -->
<fragment android:id="@+id/navigation_drawer"
    android:layout_width="@dimen/navigation_drawer_width" android:layout_height="match_parent"
    android:layout_gravity="start"
    android:name="com.example.user.myapplication.NavigationDrawerFragment"
    tools:layout="@layout/fragment_navigation_drawer" />

还有一个非常基本的抽屉导航。它上面什么都没有，只有文字，所以我不会在这里发布，因为它毫无意义一切正常，但唯一的问题是按钮。我真的是安卓新手。我最初有一个 onCreate 而不是按钮操作所在的 onStart，因为它有错误，我被告知每个 Activity 只能调用一次 onCreate。

如果您能给出答案并提供解释，将不胜感激，以提高我的学习水平。

Answer 1

删除 onStart

并将值传递给onCreate应该是这样的

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

 final MediaPlayer intromp = MediaPlayer.create(this, R.raw.intro);

    Button intro = (Button) this.findViewById(R.id.intro);
    intro.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (intromp.isPlaying()) {
                intromp.seekTo(0);
            } else {
                intromp.start();
            }
        }
    });

    final MediaPlayer holyshitmp = MediaPlayer.create(this, R.raw.holyshit);

    final Button holyshit = (Button) this.findViewById(R.id.holyshit);
    holyshit.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (holyshitmp.isPlaying()) {
                holyshitmp.seekTo(0);
            } else {
                holyshitmp.start();
            }
        }
    });

    final MediaPlayer limberthanwatermp = MediaPlayer.create(this, R.raw.limberthanwater);

    Button limberthanwater = (Button) this.findViewById(R.id.limberthanwater);
    limberthanwater.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (limberthanwatermp.isPlaying()) {
                limberthanwatermp.seekTo(0);
            } else {
                limberthanwatermp.start();
            }
        }
    });

    final MediaPlayer sandpapernipplwsmp = MediaPlayer.create(this, R.raw.sandpapernipples);

    Button sandpapernipples = (Button) this.findViewById(R.id.sandpapernipples);
    sandpapernipples.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (sandpapernipplwsmp.isPlaying()) {
                sandpapernipplwsmp.seekTo(0);
            } else {
                sandpapernipplwsmp.start();
            }
        }
    });

    final MediaPlayer raisemyweinermp = MediaPlayer.create(this, R.raw.raisingmyweiner);

    Button raisemyweiner = (Button) this.findViewById(R.id.raisemyweiner);
    raisemyweiner.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (raisemyweinermp.isPlaying()) {
                raisemyweinermp.seekTo(0);
            } else {
                raisemyweinermp.start();
            }
        }
    });

    final MediaPlayer alientacklesatreemp = MediaPlayer.create(this, R.raw.alientacklesatree);

    final Button alientacklesatree = (Button) this.findViewById(R.id.alientacklesatree);
    alientacklesatree.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (alientacklesatreemp.isPlaying()) {
                alientacklesatreemp.seekTo(0);
            } else {
                alientacklesatreemp.start();
            }
        }
    });

    final MediaPlayer nipplerubbermp = MediaPlayer.create(this, R.raw.nipplerubber);

    Button nipplerubber = (Button) this.findViewById(R.id.nipplerubber);
    nipplerubber.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (nipplerubbermp.isPlaying()) {
                nipplerubbermp.seekTo(0);
            } else {
                nipplerubbermp.start();
            }
        }
    });

    final MediaPlayer shittalkmp = MediaPlayer.create(this, R.raw.shittalk);

    Button shittalk = (Button) this.findViewById(R.id.shittalk);
    shittalk.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (shittalkmp.isPlaying()) {
                shittalkmp.seekTo(0);
            } else {
                shittalkmp.start();
            }
        }
    });


mNavigationDrawerFragment = (NavigationDrawerFragment)
        getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();

// Set up the drawer.
mNavigationDrawerFragment.setUp(
        R.id.navigation_drawer,
        (DrawerLayout) findViewById(R.id.drawer_layout));