Java Android共享按钮不出现，材质设计不起作用

共享按钮不会出现在操作栏上。。请帮忙。。！！ 代码如下：

MainActivity.java

import java.util.ArrayList;
import java.util.Currency;
import android.content.Context;
import android.os.Vibrator;
import android.speech.RecognizerIntent;
import android.app.Activity;
import android.support.v4.view.MenuItemCompat;
import android.support.v7.app.ActionBarActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.annotation.SuppressLint;
import android.content.ActivityNotFoundException;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ListView;
import android.support.v7.widget.ShareActionProvider;
import android.widget.Toast;
import android.support.v7.app.ActionBar.OnNavigationListener;
import android.support.v7.app.ActionBar;
import android.support.v4.app.ShareCompat;


@SuppressLint("DefaultLocale") public class MainActivity extends ActionBarActivity {
protected static final int REQUEST_OK = 1;
ListView l1;
ArrayList<Array_songs> songlist;
EditText e1;
Song_adapter adp;
private ShareActionProvider MenuSAP;

ImageButton ib;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ActionBar actionBar = getSupportActionBar();
    //actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_HOME | ActionBar.DISPLAY_SHOW_TITLE);
    actionBar.setDisplayShowHomeEnabled(true);
    actionBar.setIcon(R.drawable.iconw);

    l1=(ListView)findViewById(R.id.lv1);
    ib=(ImageButton)findViewById(R.id.ib1);
    songlist=new ArrayList<Array_songs>();
    e1= (EditText)findViewById(R.id.editText1);
    e1.addTextChangedListener(tw);

    ib.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            Intent i=new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
            i.putExtra(RecognizerIntent.EXTRA_LANGUAGE, "en-US");
            try{
                startActivityForResult(i,REQUEST_OK );
            }catch(ActivityNotFoundException r){
                Toast.makeText(getApplicationContext(),"song cant be played", Toast.LENGTH_SHORT).show();

            }


        }
    });


    adp=new Song_adapter(MainActivity.this, songlist, this.getApplication());
    l1.setAdapter(adp);
    getSongList("");


    l1.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int position,long arg3) {

            int sCB = getVar();
            if(sCB == 0) {
                Array_songs slist = songlist.get(position);
                String Song_Title = slist.get_title();
                String Song_Artist = slist.get_artist();
                long Song_ID = slist.get_id();


                //Toast.makeText(getApplicationContext(), Song_Artist + Song_Title + String.valueOf(Song_ID), Toast.LENGTH_SHORT).show();

                // TODO Auto-generated method stub

                Uri song_path = ContentUris.withAppendedId(android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, Song_ID);


                Intent musicplayer = new Intent(Intent.ACTION_VIEW);
                musicplayer.setDataAndType(song_path, "audio/*");

                try {

                    startActivity(musicplayer);

                } catch (ActivityNotFoundException e) {

                    Toast.makeText(getApplicationContext(), "Try Again", Toast.LENGTH_SHORT).show();

                }

            }
            else
            {

            }

        }
    });



    l1.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
            changeVar();
            vibrate();
            int select = l1.getSelectedItemPosition();
            l1.setItemChecked(select, true);
            adp.notifyDataSetChanged();
            return false;
        }
    });
}

private void vibrate() {
    Vibrator v = (Vibrator) this.getSystemService(Context.VIBRATOR_SERVICE);
    v.vibrate(120);
}


private void changeVar() {
    ((SyncClass) this.getApplication()).setShowCheckBox(1);
}



private int getVar()
{
    Integer sCB = Integer.parseInt(((SyncClass) this.getApplication()).getShowCheckBox());
    return sCB;
}



TextWatcher tw=new TextWatcher() {

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        // TODO Auto-generated method stub
        songlist.clear();
        adp.notifyDataSetChanged();
        getSongList(s.toString());



    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,
                                  int after) {
        // TODO Auto-generated method stub

    }

    @Override
    public void afterTextChanged(Editable s) {
        // TODO Auto-generated method stub

    }
};



protected void  onActivityResult(int requestcode,int resultcode,Intent data){

    super.onActivityResult(requestcode, resultcode, data);

    if(requestcode==REQUEST_OK && resultcode==RESULT_OK){
        ArrayList<String> ls=data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);

        e1.setText(ls.get(0));

    }


}



public void getSongList(String stitle){
    ContentResolver cr= getContentResolver();
    Uri music=android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    Cursor mus=cr.query(music, null, null, null, null);

    if(mus != null && mus.moveToFirst()){

        int titleint=mus.getColumnIndex(android.provider.MediaStore.Audio.Media.TITLE);
        int artistint= mus.getColumnIndex(android.provider.MediaStore.Audio.Media.ARTIST);
        int songid=mus.getColumnIndex(android.provider.MediaStore.Audio.Media._ID);
        do{
            String songTitle=mus.getString(titleint);
            String songArtist=mus.getString(artistint);
            long  songId=mus.getLong(songid);

            if(songTitle.toUpperCase().contains(stitle.toUpperCase())){


                songlist.add(new Array_songs(songId, songTitle, songArtist));

            }

        }while(mus.moveToNext());

    }

}



@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);
    MenuItem item = menu.findItem(R.id.menu_item_share);
    MenuSAP = new ShareActionProvider(this);
    MenuSAP.setShareIntent(createShareIntent());
    MenuItemCompat.setActionProvider(item, MenuSAP);
    return super.onCreateOptionsMenu(menu);
}

private Intent createShareIntent() {
    Intent shareIntent = new Intent(Intent.ACTION_SEND);
    shareIntent.setType("audio/*");
    shareIntent.putExtra(Intent.EXTRA_MIME_TYPES,"audio/*");
    return shareIntent;
}


@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);
}



@Override
public void onBackPressed() {
    int check;
    check = getVar();
    if(check == 1)
    {
        ((SyncClass) this.getApplication()).setShowCheckBox(0);
        adp.notifyDataSetChanged();
    }
    else
    {
        super.onBackPressed();
    }

}
}

menu_main.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"      tools:context=".MainActivity"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
    android:id="@+id/action_settings"
    android:title="@string/action_settings"
    android:orderInCategory="100"
    app:showAsAction="never" />
<item
    android:id="@+id/menu_item_share"
    app:showAsAction="ifRoom"
    android:title="Share"
    android:actionProviderClass="android.widget.ShareActionProvider" />

另外我想将材料设计主题应用到我的项目中。。我已经做了以下工作：-

Android清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.musicginni" >
<uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="21" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.VIBRATE"/>
<application
    android:allowBackup="true"
    android:icon="@drawable/iconw"
    android:theme="@style/Theme.AppCompat"
    android:name=".SyncClass">
    <activity
        android:name=".StartUp"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAINACTIVITY" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>
</application>

</manifest>

这是styles.xml（v21）文件

#ff95609b
#ff644469
#fff8f7ec
@颜色/自定义主题颜色
#ff403a25
#ffffffff

Styles.xml文件

<resources>

<!-- Base application theme. -->
<style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar">
    <!-- Customize your theme here. -->
    <item name="android:actionBarStyle">@style/MyActionBar</item>
    <item name="android:absListViewStyle">@style/MyListView</item>
</style>
<style name="MyActionBar" parent="@android:style/Widget.Holo.Light.ActionBar">
    <item name="android:background">#ff774d7d</item>
</style>
<style name="MyListView" parent="@android:style/Widget.Holo.Light.ListView">
    <item name="android:background">#ffb3aac6</item>
</style>

</resources>

@样式/MyActionBar
@样式/MyListView
#ff774d7d
#ffb3aac6

在我编译appcompat v7库并使用ActionBarActivity而不是Activity之前，材料设计工作正常。

更改为：

<item
    android:id="@+id/menu_item_share"
    app:showAsAction="ifRoom"
    android:title="Share"
    app:actionProviderClass="android.support.v7.widget.ShareActionProvider"    />

如果您使用的是

progaud

，您需要：

-keep class android.support.v7.widget.ShareActionProvider { *; }

编辑 试试这个：

    getMenuInflater().inflate(R.menu.menu_main, menu);
    new ShareActionProvider(this).setShareIntent(createShareIntent());

    return super.onCreateOptionsMenu(menu);

---

您必须检查以下步骤

如果您的活动扩展自AppCompatActivity，则必须在 menu_main.xml必须以app:showAsActio…或app:actionProvider等开头的项

您必须导入正确的（导入：android.support.v7.widget.ShareActionProvider）

在方法

oncreateoptions菜单

（菜单菜单项）上，您必须将值

MenuItemCompat.getActioProvider（菜单项）

属性化，而不仅仅是

menuItem（getActionProvider）

---

感谢您的帮助，但当我运行此代码时，它会出现以下异常

java.lang.NullPointerException:尝试在空对象引用上调用虚拟方法“void android.support.v7.widget.ShareActionProvider.SetShareContent（android.content.Intent）”

也在菜单_main.xml

android:actionProviderClass中=“android.support.v7.widget.ShareActionProvider“

给出错误，因为

android.support.v7.widget.ShareActionProvider不可分配给android.view.ActionProvider

xml工作正常，但在同一行代码中仍然存在空指针错误。您确定已将xml更改为app:actionProviderClass吗？您必须使用应用程序前缀。错误android.support.v7.widget.ShareActionProvider不可分配给android.view.ActionProvider说它不是正确的。是的，我对此绝对肯定。。XML现在可以正常工作了。。java语句仍然给出空指针错误…代码运行时没有任何异常，但是共享按钮仍然没有出现。您应该阅读设置答案格式的方法，并更好地使用预览功能。按原样，您的输入几乎无法读取。

<item
    android:id="@+id/menu_item_share"
    app:showAsAction="ifRoom"
    android:title="Share"
    app:actionProviderClass="android.support.v7.widget.ShareActionProvider"    />

 @Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_main, menu);
    MenuItem item = menu.findItem(R.id.menu_item_share);
    ShareActionProvider MenuSAP = (ShareActionProvider)  MenuItemCompat.getActionProvider(item);
    MenuSAP.setShareIntent(createShareIntent());
    return super.onCreateOptionsMenu(menu);
}

-keep class android.support.v7.widget.ShareActionProvider { *; }

    getMenuInflater().inflate(R.menu.menu_main, menu);
    new ShareActionProvider(this).setShareIntent(createShareIntent());

    return super.onCreateOptionsMenu(menu);