Android(安卓)动态生成布局 （多层嵌套）
16lz
2021-01-26
Android 除了可以加载xml文件，显示布局外，也可以代码生成布局，并通过setContentView(View view)方法显示布局。单独的一层布局，如一个主布局加一个控件（如Button\imageView等）动态生成代码比较简单，下面只给出示例代码：
package com.example.android_dongtaishengcheng;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.Menu;import android.view.View;import android.widget.Button;import android.widget.RelativeLayout;import android.widget.Toast;import android.widget.RelativeLayout.LayoutParams;public class MainActivity extends Activity{ RelativeLayout relativeLayout = null; private Button button; @Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);relativeLayout = new RelativeLayout(this);LayoutParams params = new LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT,RelativeLayout.LayoutParams.MATCH_PARENT);relativeLayout.setLayoutParams(params);relativeLayout.setBackgroundResource(R.color.back);setContentView(relativeLayout);button = new Button(this);LayoutParams params2 = new LayoutParams(300, 300);button.setLayoutParams(params2);params2.addRule(RelativeLayout.CENTER_IN_PARENT);button.setText("hello");relativeLayout.addView(button);button.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v) {// TODO Auto-generated method stubstartActivity(new Intent(MainActivity.this,SecondActivity.class)); }}); }}情景描述：父布局是一个线性布局，其子布局按竖直方向排列，子布局的子布局也是一个线性布局，按水平方向排列。
其实很简单，关键点在于，如何控制主布局的子布局换行显示，即实现Orientation = "vertical"。可以在子布局外在加一层布局，即下面的drawParent()方法，该方法用来生成父布局的直接子布局，drawView()方法用来生成直接子布局的子布局（该布局也是多层嵌套）。可以实现如下图效果：
贴出代码如下：
/** * */package com.example.android_dongtaishengcheng;import android.R.integer;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.view.Gravity;import android.view.View;import android.widget.Button;import android.widget.LinearLayout;import android.widget.RelativeLayout;import android.widget.LinearLayout.LayoutParams;/** * @author zhiyuan * * 2014-5-29 上午10:44:44 * */public class SecondActivity extends Activity{ LinearLayout layout = null; LinearLayout line2 = null; LinearLayout line3 = null; LinearLayout line4 = null; @Override protected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);layout = new LinearLayout(this);LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);layout.setLayoutParams(params);layout.setOrientation(LinearLayout.VERTICAL);setContentView(layout);// layout.addView(drawView(this));line2 = (LinearLayout) drawParent(this);line3 = (LinearLayout) drawParent(this);line4 = (LinearLayout) drawParent(this);for (int i = 0; i < 2; i++){ line2.addView(drawView(SecondActivity.this, i));}for (int i = 0; i < 4; i++){ line3.addView(drawView(SecondActivity.this, i));}for(int i = 0; i < 5; i++){ line4.addView(drawView(SecondActivity.this, i));}layout.addView(line2);layout.addView(line3);layout.addView(line4); } //生成子布局的子布局 public View drawView(Context context, int count) {LinearLayout layout = new LinearLayout(context);LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT, 1);params.gravity = Gravity.CENTER;layout.setOrientation(LinearLayout.HORIZONTAL);layout.setLayoutParams(params);if (count == 1){ layout.setBackgroundResource(R.color.back);}RelativeLayout relativeLayout = new RelativeLayout(context);android.widget.RelativeLayout.LayoutParams params3 = new android.widget.RelativeLayout.LayoutParams(android.widget.RelativeLayout.LayoutParams.MATCH_PARENT,android.widget.RelativeLayout.LayoutParams.WRAP_CONTENT);relativeLayout.setLayoutParams(params3);/* * ImageView imageView = new ImageView(context); LayoutParams params2 = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); */Button imageView = new Button(context);android.widget.RelativeLayout.LayoutParams params2 = new android.widget.RelativeLayout.LayoutParams(android.widget.RelativeLayout.LayoutParams.WRAP_CONTENT,android.widget.RelativeLayout.LayoutParams.WRAP_CONTENT);//imageView.setGravity(RelativeLayout.CENTER_IN_PARENT);imageView.setText("测试");params2.addRule(RelativeLayout.CENTER_IN_PARENT);// imageView.setBackgroundResource(R.drawable.ic_launcher);imageView.setLayoutParams(params2); /* * TextView textView = new TextView(context); LayoutParams params3 = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); textView.setText("测试专用"); * textView.setLayoutParams(params3); */relativeLayout.addView(imageView);// layout.addView(textView); layout.addView(relativeLayout);return layout; } //生成主布局的子布局 public View drawParent(Context context) {LinearLayout layout = new LinearLayout(context);LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);// params.gravity = Gravity.CENTER_HORIZONTAL;layout.setOrientation(LinearLayout.HORIZONTAL);layout.setLayoutParams(params);return layout; }}附Demo下载地址： http://download.csdn.net/detail/laoziyueguo3/7423939
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