Activity常用控件

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一、种类

1. TextView 文本控件

2. Button 按钮控件

3. RadioGroup 单选按钮组控件

RadioButon 单选控件

4. CheckBox 复选框控件

5. Toast控件

6. ProgressBar控件

二、布局文件中添加控件

<widget

android:id="@+id/name"

   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/content"></widget>

对于ProgressBar控件还有选项：

style="?android:attr/progressBarStyleHorizontal" //进度条的风格

android:visibility="gone"//进度条初始不显示

三、Activity中获取控件id

Widget widget = (Widget)findViewById(R.id.name);

四、设置监听器

①Button

button1.setOnClickListener(new MyButtonListener()); //设置监听事件

            class MyButtonListener implements OnClickListener{
   @Override
          public void onClick(View v) { //单击时的动作
           // TODO Auto-generated method stub
          }
      }

②RadioGroup

radioGroup.setOnCheckedChangeListener(new myRadioGroup());

          class myRadioGroup implements RadioGroup.OnCheckedChangeListener{
        @Override
       public void onCheckedChanged(RadioGroup group, int checkedId) {
           // TODO Auto-generated method stub
           if (radioButton1.getId() == checkedId)
           {
               Toast.makeText(MainActivity.this, "male", Toast.LENGTH_SHORT).show();
           }else if (radioButton2.getId() == checkedId)
           {
               Toast.makeText(MainActivity.this, "female", Toast.LENGTH_SHORT).show();
           }
          }
   }

③CheckBox

checkBox1.setOnCheckedChangeListener(new myCheckBox1());

      class myCheckBox1 implements CompoundButton.OnCheckedChangeListener{
        @Override
       public void onCheckedChanged(CompoundButton buttonView,
               boolean isChecked) {
           // TODO Auto-generated method stub
           if (isChecked)
           {
               Toast.makeText(MainActivity.this, "swim", Toast.LENGTH_SHORT).show();
           }
       }
    }

五控件常用函数

Toast:

Toast.makeText(MainActivity.this, "swim", Toast.LENGTH_SHORT).show();

ProgressBar:

firstBar.setVisibility(View.VISIBLE); //显示
firstBar.setMax(150);//设置进度条最大值

firstBar.setProgress(i);//设置进度条第一进度

firstBar.setSecondaryProgress(i+10);//设置进度条第二进度

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