虚拟导航栏适配

在写界面的时候然后发现在界面最底下的几行文字正好被虚拟导航栏遮挡住了，不滑动还看不到底下的文字，所以想隐去这些导航栏。
采用下面的代码将DecorView中的属性设置为隐藏 navigation，我这里注销掉了全屏的属性，按需添加or删除属性吧

 11 && Build.VERSION.SDK_INT < 19) { // lower api
            View v = this.getWindow().getDecorView();
            if(v!=null){
                v.setSystemUiVisibility(View.GONE);
            }
        } else if (Build.VERSION.SDK_INT >= 19) {
            //for new api versions.
            View decorView = getWindow().getDecorView();
            int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY/* | View.SYSTEM_UI_FLAG_FULLSCREEN*/;
            if (decorView != null) {
                decorView.setSystemUiVisibility(uiOptions);
            }

        }
    }1
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" data-snippet-id="ext.c635ae4a92490f41cf801e12d12759e7" data-snippet-saved="false" data-codota-status="done">`  &lt;span class="hljs-keyword">protected&lt;/span> &lt;span class="hljs-keyword">void&lt;/span> &lt;span class="hljs-title">hideBottomMenu&lt;/span>() {
        &lt;span class="hljs-comment">//隐藏虚拟按键&lt;/span>
        &lt;span class="hljs-keyword">if&lt;/span> (Build.VERSION.SDK_INT &gt; &lt;span class="hljs-number">11&lt;/span> && Build.VERSION.SDK_INT &lt; &lt;span class="hljs-number">19&lt;/span>) { &lt;span class="hljs-comment">// lower api&lt;/span>
            View v = &lt;span class="hljs-keyword">this&lt;/span>.getWindow().getDecorView();
            &lt;span class="hljs-keyword">if&lt;/span>(v!=&lt;span class="hljs-keyword">null&lt;/span>){
                v.setSystemUiVisibility(View.GONE);
            }
        } &lt;span class="hljs-keyword">else&lt;/span> &lt;span class="hljs-keyword">if&lt;/span> (Build.VERSION.SDK_INT &gt;= &lt;span class="hljs-number">19&lt;/span>) {
            &lt;span class="hljs-comment">//for new api versions.&lt;/span>
            View decorView = getWindow().getDecorView();
            &lt;span class="hljs-keyword">int&lt;/span> uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY&lt;span class="hljs-comment">/* | View.SYSTEM_UI_FLAG_FULLSCREEN*/&lt;/span>;
            &lt;span class="hljs-keyword">if&lt;/span> (decorView != &lt;span class="hljs-keyword">null&lt;/span>) {
                decorView.setSystemUiVisibility(uiOptions);
            }

        }
    }`

我们业务逻辑只要window获取焦点就执行

@Override public void onWindowFocusChanged(boolean hasFocus) { super.onWindowFocusChanged(hasFocus); if (hasFocus) { mDecorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY); } }

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