Android动态生成Relativelayout + button

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要求：输入每行btn个数，输出一共200个btn。

直接上代码，参考了csdn上的博客 android：动态创建多个按钮

不需要任何XML文件即可显示出btn。

import androidx.appcompat.app.AppCompatActivity;import android.content.Context;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RelativeLayout;public class MainActivity extends AppCompatActivity {private EditText editNum;private Button addbtn;DisplayMetrics dm = new DisplayMetrics();//MainActivity().getMetrics(dm);int width = dm.widthPixels;int height = dm.heightPixels;Button[] btt = new Button[205];//RelativeLayout layout = new RelativeLayout(this);@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);final RelativeLayout rlayout = new RelativeLayout(this);RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);layoutParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT );RelativeLayout.LayoutParams layoutParams2 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);layoutParams2.addRule(RelativeLayout.ALIGN_PARENT_LEFT );rlayout.setLayoutParams(layoutParams);editNum = new EditText(MainActivity.this);editNum.setHint("请输入个数");editNum.setLayoutParams(layoutParams2);addbtn = new Button(MainActivity.this);addbtn.setWidth(100);addbtn.setHeight(40);addbtn.setText("add");addbtn.setLayoutParams(layoutParams);rlayout.addView(editNum);rlayout.addView(addbtn);addbtn.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {int linenum = Integer.parseInt(editNum.getText().toString());DisplayMetrics dm = new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(dm);int width = dm.widthPixels;int height = dm.heightPixels;Button Btn[] = new Button[205];int j = -1;for  (int i=0; i<200; i++) {Btn[i]=new Button(MainActivity.this);Btn[i].setId(i);Btn[i].setText("B"+i);RelativeLayout.LayoutParams btParams = new RelativeLayout.LayoutParams ((width-50)/linenum,120);if (i%linenum == 0) {j++;}btParams.leftMargin = 10+ ((width-50)/linenum+10)*(i%linenum);btParams.topMargin = 120 + 120*j;   rlayout.addView(Btn[i],btParams);   }}});setContentView(rlayout);}}

运行效果

参考博文：https://blog.csdn.net/lihengfang/article/details/8204238

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