android代码里面写布局简单示例

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);
}