Android 设置透明背景-操作栏

我试图将actionbar的背景设置为透明

可能吗？如果可能的话，有人能告诉我怎么做吗

这是我的密码：

public class MainMenu extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        ActionBar actionbar = getSupportActionBar();
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_main_menu);
        LinearLayout v = (LinearLayout) findViewById(R.id.layout);
        //v.setBackgroundColor(0xffECECEC);
        v.setBackgroundResource(R.drawable.background);

        actionbar.setDisplayShowTitleEnabled(false);
        actionbar.setDisplayShowHomeEnabled(false);

        LayoutInflater mInflater = LayoutInflater.from(this);
        View mCustomView = mInflater.inflate(R.layout.action, null);
        TextView mTitleTextView = (TextView) mCustomView.findViewById(R.id.actiontitle);
        mTitleTextView.setText("HADI");

        actionbar.setCustomView(mCustomView);
        actionbar.setDisplayShowCustomEnabled(true);

        BitmapDrawable background = new BitmapDrawable (BitmapFactory.decodeResource(getResources(), R.drawable.actionbar)); 
         background.setTileModeX(android.graphics.Shader.TileMode.REPEAT); 

         actionbar.setBackgroundDrawable(background);

    }

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通过在actionbar样式中设置alpha进行修复

请参见