android 新建项目中去掉标题栏

1.新建new android application project

theme选none 并打钩创建一个Blank Activity

运行如下图所示：

2。若想把标题栏去掉，更改Manifestr的MainActivity 主题样式

>styles.xml中改

开始将<style name="AppTheme" parent="AppBaseTheme">

改为：<style name="AppTheme" parent="android:Theme.Light.NoTitleBar">//无标题白色背景

去行，闪退并报错：Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.

3。原因，是由于public class MainActivity extends ActionBarActivity在创建的时候继承了ActionBarActivity有标题的类，这样就会报错

更改继承FragmentActivity并把相应提示报错处理一下就可以。

具体代码如下：

 1 package com.example.abc; 2  3 import android.support.v7.app.ActionBarActivity; 4 import android.support.v7.app.ActionBar; 5 import android.support.v4.app.Fragment; 6 import android.support.v4.app.FragmentActivity; 7 import android.os.Bundle; 8 import android.view.LayoutInflater; 9 import android.view.Menu;10 import android.view.MenuItem;11 import android.view.View;12 import android.view.ViewGroup;13 import android.os.Build;14 15 public class MainActivity extends FragmentActivity {16 17     @Override18     protected void onCreate(Bundle savedInstanceState) {19         super.onCreate(savedInstanceState);20         setContentView(R.layout.activity_main);21 22         if (savedInstanceState == null) {23             getSupportFragmentManager().beginTransaction()24                     .add(R.id.container, new PlaceholderFragment()).commit();25         }26     }27 28 //    @Override29 //    public boolean onCreateOptionsMenu(Menu menu) {30 //31 //        // Inflate the menu; this adds items to the action bar if it is present.32 //        getMenuInflater().inflate(R.menu.main, menu);33 //        return true;34 //    }35 //36 //    @Override37 //    public boolean onOptionsItemSelected(MenuItem item) {38 //        // Handle action bar item clicks here. The action bar will39 //        // automatically handle clicks on the Home/Up button, so long40 //        // as you specify a parent activity in AndroidManifest.xml.41 //        int id = item.getItemId();42 //        if (id == R.id.action_settings) {43 //            return true;44 //        }45 //        return super.onOptionsItemSelected(item);46 //    }47 48     /**49      * A placeholder fragment containing a simple view.50      */51     public static class PlaceholderFragment extends Fragment {52 53         public PlaceholderFragment() {54         }55 56         @Override57         public View onCreateView(LayoutInflater inflater, ViewGroup container,58                 Bundle savedInstanceState) {59             View rootView = inflater.inflate(R.layout.fragment_main, container,60                     false);61             return rootView;62         }63     }64 65 }

运行正确：

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