1.設定全屏
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager
.LayoutParams.FLAG_FULLSCREEN);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
//必須在setContentView前設定,否則報錯
2.設定橫屏顯示
在androiddmanifest,activity屬性
<activity android:name=".activity.PlayMp4"
android:screenOrientation="landscape"
android:configChanges="orientation|keyboardHidden"/>