Android 状态栏虚拟导航键透明效果的实现方法

public class MainActivity extends AppCompatActivity {  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    // 隐藏标题栏    supportRequestWindowFeature(Window.FEATURE_NO_TITLE);    View root = LayoutInflater.from(this).inflate(R.layout.activity_main, null);    // 或者 在界面的根层加入 android:fitsSystemWindows=”true” 这个属性，这样就可以让内容界面从 状态栏 下方开始。    ViewCompat.setFitsSystemWindows(root, true);    setContentView(root);    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {      // Android 5.0 以上 全透明      Window window = getWindow();      window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS          | WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);      window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN          | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION          | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);      window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);      // 状态栏（以上几行代码必须，参考setStatusBarColor|setNavigationBarColor方法源码）      window.setStatusBarColor(Color.TRANSPARENT);      // 虚拟导航键      window.setNavigationBarColor(Color.TRANSPARENT);    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {      // Android 4.4 以上 半透明      Window window = getWindow();      // 状态栏      window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);      // 虚拟导航键      window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);    }  }}

<?xml version="1.0" encoding="utf-8"?><RelativeLayout  xmlns:android="http://schemas.android.com/apk/res/android"  android:id="@+id/activity_main"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:background="@color/colorPrimary"  >  <TextView    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="Hello World!"    /></RelativeLayout>

/**   * Sets the color of the status bar to {@code color}.   *   * For this to take effect,   * the window must be drawing the system bar backgrounds with   * {@link android.view.WindowManager.LayoutParams#FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS} and   * {@link android.view.WindowManager.LayoutParams#FLAG_TRANSLUCENT_STATUS} must not be set.   *   * If {@code color} is not opaque, consider setting   * {@link android.view.View#SYSTEM_UI_FLAG_LAYOUT_STABLE} and   * {@link android.view.View#SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}.   * <p>   * The transitionName for the view background will be "android:status:background".   * </p>   */  public abstract void setStatusBarColor(@ColorInt int color);

 /**   * Sets the color of the navigation bar to {@param color}.   *   * For this to take effect,   * the window must be drawing the system bar backgrounds with   * {@link android.view.WindowManager.LayoutParams#FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS} and   * {@link android.view.WindowManager.LayoutParams#FLAG_TRANSLUCENT_NAVIGATION} must not be set.   *   * If {@param color} is not opaque, consider setting   * {@link android.view.View#SYSTEM_UI_FLAG_LAYOUT_STABLE} and   * {@link android.view.View#SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}.   * <p>   * The transitionName for the view background will be "android:navigation:background".   * </p>   */  public abstract void setNavigationBarColor(@ColorInt int color);

Android:fitsSystemWindows=”true”

ViewCompat.setFitsSystemWindows(rootView, true);

/**   * 获取状态栏高度   * @return   */  public int getStatusBarHeight() {    int statusBarHeight = 0;    int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");    if (resourceId > 0) {      statusBarHeight = getResources().getDimensionPixelSize(resourceId);    }    return statusBarHeight;  }