无法在Android视图中查看视图

Question

我试图只是测试一下，并在蓝色视图中出现红色视图，但这不起作用？

import android.app.Activity;
import android.content.DialogInterface;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;


public class Game extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    initialize();
}

protected void initialize() {
    LinearLayout maze = new LinearLayout(this);
    maze.setBackgroundColor(Color.BLUE);
    maze.setLayoutParams(new LinearLayout.LayoutParams(40, 40));

    LinearLayout maze1 = new LinearLayout(this);

    maze1.setLayoutParams(new LinearLayout.LayoutParams(20, 20));
    maze1.setBackgroundColor(Color.RED);

    maze.addView(maze1);
    setContentView(maze);
    }

}

我更新了我的代码以包含整个班级。

Answer 1

您还应该为根布局添加尺寸。

LinearLayout maze = new LinearLayout(this);
maze.setBackgroundColor(Color.BLUE);

LinearLayout maze1 = new LinearLayout();

maze1.setLayoutParams(new LinearLayout.LayoutParams(20, 20));
maze1.setBackgroundColor(Color.RED);

maze.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));

maze.addView(maze1);
setContentView(maze);