Activity 中动态增加控件

静态: layout/*.xml 布局 UI? 。通过(ControlType)findViewById(R.id.name)来实例化。

动态: 通过 Java code 增加， ControlType control?= new ControlType control 来实例化。

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动态增加控件的基本思路就是：实例化控件-> 布局.addView(控件) -> OnCreat中绑定布局控件 setContentView(布局）

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例1：在LinearLayout中动态增加Button,EditText等控件，并且点击Button后，动态增加EditText等控件。

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@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);final LinearLayout linearLayout=new LinearLayout(this);  linearLayout.setOrientation(LinearLayout.VERTICAL);LinearLayout linearLayout1 = new LinearLayout(this);linearLayout1.setOrientation(LinearLayout.VERTICAL);Button button1= new Button(this);button1.setText("增加新项目");Button button2 = new Button(this);button2.setText("增加新组");linearLayout.addView(button1);linearLayout.addView(button2);//设定按钮单击监听器,动态增加控件.button2.setOnClickListener(new Button.OnClickListener(){public void onClick(View v) {Context context = v.getContext();LinearLayout linearLayout2 = new LinearLayout(context);linearLayout2.setOrientation(LinearLayout.HORIZONTAL);EditText groupNameEditText = new EditText(context);//设置控件大小.groupNameEditText.setWidth(160);ImageButton imagebutton1 = new ImageButton(context);Button saveButton = new Button(context);Button exitButton = new Button(context);linearLayout2.addView(groupNameEditText);linearLayout2.addView(imagebutton1);linearLayout2.addView(saveButton);linearLayout2.addView(exitButton);linearLayout.addView(linearLayout2);}});setContentView(linearLayout);}

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