Question

android:below用java代码怎么实现

Answer 1

android：below表示在某个控件下面，用代码首先是设置一个布局参数，如下代码：

public class MyActivity extends Activity {
    /**
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
//        setContentView(R.layout.main);

        RelativeLayout rl=new RelativeLayout(this);
        //创建TextView1
        TextView tv1=new TextView(this);
        tv1.setText("111111111111111111111111111");
        tv1.setTextSize(20);
        //设定 tv1 的 id ，后面规则要用到
        tv1.setId(1);
        //将tv1加入布局
        rl.addView(tv1);
        //创建TextView2
        TextView tv2=new TextView(this);
        tv2.setText("2222222222222222222222222222");
        tv2.setTextSize(20);
        //创建RelativeLayout.LayoutParams
        RelativeLayout.LayoutParams params=new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
        //添加规则  1为tv1的id
        params.addRule(RelativeLayout.BELOW,1);
        //将tv2加入布局 传入参数params
        rl.addView(tv2,params);

        setContentView(rl);
    }

Answer 2

public class MyActivity extends Activity {
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.main);

RelativeLayout rl=new RelativeLayout(this);
//创建TextView1
TextView tv1=new TextView(this);
tv1.setText("111111111111111111111111111");
tv1.setTextSize(20);
//设定 tv1 的 id ，后面规则要用到
tv1.setId(1);
//将tv1加入布局
rl.addView(tv1);
//创建TextView2
TextView tv2=new TextView(this);
tv2.setText("2222222222222222222222222222");
tv2.setTextSize(20);
//创建RelativeLayout.LayoutParams
RelativeLayout.LayoutParams params=new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
//添加规则 1为tv1的id
params.addRule(RelativeLayout.BELOW,1);
//将tv2加入布局 传入参数params
rl.addView(tv2,params);

setContentView(rl);
}