Android笔记之动态地添加View

使用ViewGroup.addView(View)可动态添加部件，ViewGroup.removeAllViews()用于移除所有部件

示例如下

MainActivity.java

package com.bu_ish.add_view_test;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.Random;

public class MainActivity extends AppCompatActivity {
    private LinearLayout llWidgets;
    private Button btnAddWidgets, btnClearWidgets;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        llWidgets = findViewById(R.id.llWidgets);
        btnAddWidgets = findViewById(R.id.btnAddWidgets);
        btnClearWidgets = findViewById(R.id.btnClearWidgets);
        btnAddWidgets.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int total = new Random().nextInt(10) + 1;
                for (int i = 0; i < total; ++i) {
                    Button btn = new Button(MainActivity.this);
                    btn.setText("按钮" + (i + 1));
                    TextView tv = new TextView(MainActivity.this);
                    tv.setText("文本视图" + (i + 1));
                    LinearLayout ll = new LinearLayout(MainActivity.this);
                    ll.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
                    ll.addView(btn);
                    ll.addView(tv);
                    llWidgets.addView(ll);
                }
            }
        });
        btnClearWidgets.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                llWidgets.removeAllViews();
            }
        });
    }
}