android布局


Android布局
当你看到android手机上的展现出漂亮的页面的时候，你就会想这是怎么做出来。其实这也不难。在每一个页面绝对会有一个相对应的布局。下面我就给大家介绍下在android开发中用到的最多的3个布局—线性布局，表格布局，相对布局。
1：线性布局（LinearLayout）
       其实布局都会有2种实现方式，一种是用布局管理器xml文件，另外一种则是用代码生成。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"à这里是要在string.xml文件定义的
    />
   <Button android:id="@+id/testButton4"
           android:layout_width="fill_parent"
           android:layout_height="wrap_content"
           android:text="@string/myRalativeLayoutButton3"/>
</LinearLayout>
以上代码线性布局的垂直布局，控制线性布局的水平与垂直是用线性的一个orientation来控制的，这样就可以达到你想要展现方式。
第二种代码生成，其实在开发中会大量的采用上面的这样的方式，但是用代码生成的，也要掌握，因为当你展现出来的控件是不确定的，当某一个按键才展现的话，这样用代码生成的话，就方便很多。
       publicclass myLinearLayout extends Activity{
    privatebooleanflag=true;
    protectedvoid onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       final LinearLayout layout=new LinearLayout(this);
       LinearLayout.LayoutParams layoutParams=new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.FILL_PARENT);
       layout.setOrientation(LinearLayout.VERTICAL);
      
       LinearLayout.LayoutParams textParams=new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
       TextView tv=new TextView(this);
       tv.setLayoutParams(textParams);
       tv.setText(R.string.myLinearLayoutText);
       tv.setTextSize(20);
      
       layout.addView(tv);
      
       LinearLayout.LayoutParams buttonParams=new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
       Button button =new Button(this);
        button.setLayoutParams(buttonParams);
       button.setText(R.string.myLinearLayoutButton1);
       layout.addView(button,buttonParams);
      
       LinearLayout.LayoutParams radioGroupParams=new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
       final RadioGroup radioGroup=new RadioGroup(myLinearLayout.this);
       radioGroup.setLayoutParams(radioGroupParams);
      
       LinearLayout.LayoutParams radioButton1Parms=new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
       final RadioButton radioButton1=new RadioButton(myLinearLayout.this);
       radioButton1.setId(1);
       radioButton1.setLayoutParams(radioButton1Parms);
       radioButton1.setText(R.string.maleText);
       radioButton1.setChecked(true);
       radioGroup.addView(radioButton1);
      
       LinearLayout.LayoutParams radioButton2Params=new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
       final RadioButton radioButton2=new RadioButton(myLinearLayout.this);
       radioButton2.setId(2);
       radioButton2.setLayoutParams(radioButton2Params);
       radioButton2.setText(R.string.famaleText);
       radioGroup.addView(radioButton2);
      
       layout.addView(radioGroup);
      
       radioGroup.setVisibility(View.GONE);
      
       super.setContentView(layout,layoutParams);
      
       button.setOnClickListener(new View.OnClickListener(){
           publicvoid onClick(View v) {
              if(flag){
                  radioGroup.setVisibility(View.VISIBLE);
                  flag=false;
              }else{
                  radioGroup.setVisibility(View.GONE);
                  flag=true;
              }
             
              radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener(){
                  publicvoid onCheckedChanged(RadioGroup group, int checkedId) {
                     if(checkedId==1){
                         radioButton2.setChecked(true);
                     }else{
            &n

补充：移动开发 , Android ,