android代码里面写布局简单示例

在MainActivity中重写oncreate（），用代码造线性布局，此布局上添加TextView用于显示。

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);

        LinearLayout ll_root = new LinearLayout(getApplicationContext());
        //setting width and height to match parent
        LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);

        ll_root.setLayoutParams(params);//set child layout 
        ll_root.setOrientation(LinearLayout.VERTICAL);//setting oreientation as vertical

        LayoutParams params2 = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);
        TextView tv_1 = new TextView(this);
        tv_1.setLayoutParams(params2);
        tv_1.setText("Text111");
        tv_1.setBackgroundColor(Color.GRAY);

        ll_root.addView(tv_1);
        setContentView(ll_root);
    }