Flutter混合开发：启动黑屏处理

上一篇 [Flutter混合开发：Android接入Flutter](https://dandanlove.blog.csdn.net/article/details/96565543) 我们讲到在 Flutter混合开发 中主要有、有 addView （页面局部Flutter） 和 setContentView （整个页面Flutter）两种方式。这两种方式在启动页面的时候都会遇到 FlutterView 出现黑屏的情况。

解决思路

延迟 FlutterView 的加载时间。

setContentView

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        View flutterView = Flutter.createView(MainActivity.this, getLifecycle(), "root1");
        FrameLayout.LayoutParams layout = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT);
        setContentView(flutterView, layout);
    }
}

这中方式目前没有找到一种很好的方式推迟 FlutterView 的加载时间。

addView

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        FrameLayout frameLayout = findViewById(R.id.flutter_root);
        View flutterView = Flutter.createView(MainActivity.this, getLifecycle(), "root1");
        FrameLayout.LayoutParams layout = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT);
        frameLayout.addView(flutterView, layout);
    }
}

这种情况我们可以使用多种方式进行 FlutterView 加载的延迟。

检测FlutterView的第一帧

public class MainActivity extends AppCompatActivity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      FrameLayout frameLayout = findViewById(R.id.flutter_root);
      frameLayout.setVisibility(View.INVISIBLE);
      FlutterView flutterView = Flutter.createView(MainActivity.this, getLifecycle(), "root");
      FrameLayout.LayoutParams layout = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT);

      FlutterView.FirstFrameListener listeners = () -> frameLayout.setVisibility(View.VISIBLE);
      flutterView.addFirstFrameListener(listeners);
      frameLayout.addView(flutterView, layout);
  }
}

在View的post方法中延迟执行FlutterView的添加

public class MainActivity extends AppCompatActivity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      FrameLayout frameLayout = findViewById(R.id.flutter_root);
      FlutterView flutterView = Flutter.createView(MainActivity.this, getLifecycle(), "root");
      FrameLayout.LayoutParams layout = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT);
      getWindow().getDecorView().post(() -> frameLayout.addView(flutterView, layout));
  }
}

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