Android基础之隐藏标题栏/设置为全屏/横竖屏切换

Z时代
2024-01-10
分类：IT

隐藏标题栏

基于xml


<application
    android:theme="@style/Theme.AppCompat.Light.NoActionBar">

动态隐藏


//继承自Activity时使用
requestWindowFeature(Window.FEATURE_NO_TITLE);
//继承自AppCompatActivity时使用
getSupportActionBar().hide();

设置为全屏

xml

android:theme="@android:style/Theme.NoTitleBar.Fullscreen"

或者

android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"

动态设置


requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);

横竖屏切换

屏幕旋转方式

AndroidManifest.xml


android:screenOrientation=""

当参数为sensor时，无论是否关闭“屏幕旋转”设置，App内的特定Activity都会根据重力传感器改变横竖屏。

动态设置


setRequestedOrientation(@ActivityInfo.ScreenOrientationint requestedOrientation);

动态设置屏幕方向


/**
* The preferred screen orientation this activity would like to run in.
* From the {@link android.R.attr#screenOrientation} attribute, one of
* {@link #SCREEN_ORIENTATION_UNSPECIFIED},
* {@link #SCREEN_ORIENTATION_LANDSCAPE},
* {@link #SCREEN_ORIENTATION_PORTRAIT},
* {@link #SCREEN_ORIENTATION_USER},
* {@link #SCREEN_ORIENTATION_BEHIND},
* {@link #SCREEN_ORIENTATION_SENSOR},
* {@link #SCREEN_ORIENTATION_NOSENSOR},
* {@link #SCREEN_ORIENTATION_SENSOR_LANDSCAPE},
* {@link #SCREEN_ORIENTATION_SENSOR_PORTRAIT},
* {@link #SCREEN_ORIENTATION_REVERSE_LANDSCAPE},
* {@link #SCREEN_ORIENTATION_REVERSE_PORTRAIT},
* {@link #SCREEN_ORIENTATION_FULL_SENSOR},
* {@link #SCREEN_ORIENTATION_USER_LANDSCAPE},
* {@link #SCREEN_ORIENTATION_USER_PORTRAIT},
* {@link #SCREEN_ORIENTATION_FULL_USER},
* {@link #SCREEN_ORIENTATION_LOCKED},
*/

设置横竖屏切换

不想Activity被销毁重建需要静态设置


android:configChanges="orientation|keyboardHidden|screenSize"

Andorid 3.2以前的SDK可以使用如下配置
android:configChanges="orientation|keyboardHidden"
Adnroid 3.2以后的SDK必须添加一个screenSize属性，具体如下
android:configChanges="keyboardHidden|orientation|screenSize"
或者
android:configChanges="orientation|screenSize"

重写onConfigurationChanged方法


@Override 
public void onConfigurationChanged(Configuration newConfig) { 
  	super.onConfigurationChanged(newConfig); 
  	if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
    		// land do nothing is ok
    		Toast.makeText(MainActivity.this,"现在是横屏", Toast.LENGTH_SHORT).show();
  	} else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
    		// port do nothing is ok
    		Toast.makeText(MainActivity.this,"现在是竖屏",Toast.LENGTH_SHORT).show();;
  	}
}

重写该方法，横竖屏切换不会重走生命周期，你可以在里面编写一些代码用来适配切换后的屏幕，你也可以直接在该方法中调用setContentView()来适配新的view
如若不在manifest里面配置，activity会走onSaveInstanceState，用来保存数据，而后重走生命周期，重新加载布局文件，因此这里可以编写多个资源文件用来适配不同屏幕尺寸

多屏幕适配