Android 在程序中动态添加 View 布局或控件

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		//setContentView(R.layout.activity_main);
		
		LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
		LinearLayout lineLayout = new LinearLayout(this);
		lineLayout.setOrientation(LinearLayout.VERTICAL);
		lineLayout.setLayoutParams(params);
		lineLayout.setGravity(Gravity.TOP );
		addView(lineLayout);
		setContentView(lineLayout);
		
	}
    
	private void addView(final LinearLayout lineLayout)
	{
		final TextView showText = new TextView(this);
		showText.setTextColor(Color.GREEN);
		showText.setTextSize(30);
		showText.setId(10001);//设置 id
		showText.setText("我是在程序中添加的第一个文本");
		showText.setBackgroundColor(Color.GRAY);
		// set 文本大小
		LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT,
				LayoutParams.WRAP_CONTENT);
		//set 四周距离
		params.setMargins(10, 10, 10, 10);
	 
		showText.setLayoutParams(params);
		
		//添加文本到主布局
		lineLayout.addView(showText );
 		
		//创建按钮
		Button btn = new Button(this);
		btn.setText("点击删除文本");
		btn.setBackgroundColor(Color.GRAY) ;
		LinearLayout.LayoutParams btn_params = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
				LayoutParams.WRAP_CONTENT); 
		btn_params.setMargins(0, 60, 60, 0);
		btn_params.gravity = Gravity.CENTER_HORIZONTAL;
		btn.setLayoutParams(btn_params);
		// 动态添加按钮到主布局
		lineLayout.addView(btn);
		
		//点击按钮 动态删除文本
		btn.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				if(null != lineLayout.findViewById(10001))
				{
					lineLayout.removeView(showText);
				}
				else
				{
					Toast.makeText(MainActivity.this, "文本已被删除", Toast.LENGTH_SHORT).show();
				}
			}
		});
		
	    //动态创建一个相对布局
		RelativeLayout relaLayout = new RelativeLayout(this);
		relaLayout.setBackgroundColor(Color.BLUE);
	    RelativeLayout.LayoutParams lp11 = new RelativeLayout.LayoutParams(
	    		ViewGroup.LayoutParams.MATCH_PARENT, 120);
	    
	   
	    relaLayout.setLayoutParams(lp11);
	    //动态创建一个文本
		final TextView RelaText = new TextView(this);
		RelaText.setTextColor(Color.GREEN);
		RelaText.setTextSize(20);
		RelaText.setText("我是在程序中添加的第二个文本，在相对布局中");
		RelaText.setBackgroundColor(Color.GRAY);
		
		//设置文本的布局
	    RelativeLayout.LayoutParams lp2 = new RelativeLayout.LayoutParams(
	    		ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
	     
	    lp2.addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE);
	    lp2.setMargins(10, 10, 10, 10);
	    //将文本添加到相对布局中
		relaLayout.addView(RelaText,lp2);
		//将这个布局添加到主布局中
	    lineLayout.addView(relaLayout);
 
	}
}