WebView 实现全屏播放视频的示例代码

webView.setWebChromeClient(new WebChromeClient() {

  @Override
  public void onShowCustomView(View view, CustomViewCallback callback) {
    // 此处的 view 就是全屏的视频播放界面，需要把它添加到我们的界面上
  }

  @Override
  public void onHideCustomView() {
    // 退出全屏播放，我们要把之前添加到界面上的视频播放界面移除
  }
});

contentParentView = findViewById(android.R.id.content);

webView.setWebChromeClient(new WebChromeClient() {

  @Override
  public void onShowCustomView(View view, CustomViewCallback callback) {
    contentParentView.addView(view);
  }

  @Override
  public void onHideCustomView() {
    contentParentView.removeView(fullScreenView);
  }
});

public class WebActivity extends AppCompatActivity {

  ...

  private WindowManager windowManager;
  private View fullScreenView = null;

  @Override
  protected void onResume() {
    super.onResume();
    // 如果之前处于全屏状态，重新进入后需要再次调用全屏
    if (fullScreenView != null) fullScreen(fullScreenView);
  }

  @Override
  public void onBackPressed() {
    // 全屏状态点击返回退出全屏
    if (fullScreenView != null) {
      windowManager.removeViewImmediate(fullScreenView);
      fullScreenView = null;
    } else {
      super.onBackPressed();
    }
  }

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_webview);
    windowManager = getWindowManager();

    webView.setWebChromeClient(new WebChromeClient() {

      @Override
      public void onShowCustomView(View view, CustomViewCallback callback) {
        // 此处的 view 就是全屏的视频播放界面，需要把它添加到我们的界面上
        windowManager.addView(view, new WindowManager.LayoutParams(WindowManager.LayoutParams.TYPE_APPLICATION));
        // 去除状态栏和导航按钮
        fullScreen(view);
        fullScreenView = view;
      }

      @Override
      public void onHideCustomView() {
        // 退出全屏播放，我们要把之前添加到界面上的视频播放界面移除
        windowManager.removeViewImmediate(fullScreenView);
        fullScreenView = null;
      }
    });
  }

  private void fullScreen(View view) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
      view.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE
          | View.SYSTEM_UI_FLAG_FULLSCREEN
          | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
          | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
          | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
          | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
    } else {
      view.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE
          | View.SYSTEM_UI_FLAG_FULLSCREEN
          | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
          | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
          | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
    }
  }
}