Android：解析XML的三种方式_安卓读取xml目录的value值

1、首先，在布局文件中写一个Button控件和用来展示数据的ListView控件。

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="获取XML"
    android:onClick="getdata"/>

    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/lv_main_data">
    </ListView>

2、新建一个布局文件，用于listview展示数据，在这个布局文件中增加你要显示数据的TextView控件。代码如下：

 <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="dfd"
        android:id="@+id/tv_listview_one"

        />
    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="dfd"
        android:id="@+id/tv_listview_two"

        />
    <TextView
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="dfd"
    android:id="@+id/tv_listview_three"

    />

然后在MainActivity.java通过解析XML拿到数据。解析XML有三种方法，方法如下：

一、DOM解析器

      DOM(Document Object Model)：是一种用于XML文档的对象模型，直接访问XML文档中所有部分。

     特点：解析速度快，一次性解析整个文档。加载大文件时候效率低。代码如下:

public class MainActivity extends AppCompatActivity {
    private ListView lv_main_data;
    private ProgressDialog pd;
    private List<UserEntity> lists = new ArrayList<>();
    private MainActivity.myadapter myadapter;
    String currentTag=null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv_main_data = (ListView) findViewById(R.id.lv_main_data);//拿到listview的ID
        myadapter = new myadapter();
        lv_main_data.setAdapter(myadapter);
        pd = new ProgressDialog(this);//动画加载中
        pd.setMessage("locaging.....");
    }
    class myadapter extends BaseAdapter{
 
        @Override
        public int getCount() {
            return lists.size();
        }
        @Override
        public Object getItem(int position) {
            return lists.get(position);
        }
        @Override
        public long getItemId(int position) {
            return position;
        }
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
              if (convertView==null){
                  convertView= LayoutInflater.from(MainActivity.this).inflate(R.layout.dom_listview,null);
                  DomActivity activity=new DomActivity();
                  activity.uname= (TextView) convertView.findViewById(R.id.tv_listview_one);
                  activity.content= (TextView) convertView.findViewById(R.id.tv_listview_two);
                  activity.anthour= (TextView) convertView.findViewById(R.id.tv_listview_three);
                  convertView.setTag(activity);
              }
            DomActivity domActivity= (DomActivity) convertView.getTag();
            domActivity.uname.setText(lists.get(position).getUname());
            domActivity.content.setText(lists.get(position).getContent());
            domActivity.anthour.setText(lists.get(position).getAnthour());
            return convertView;
        }
    }
//获取xml数据
    public void getdata(View view){
      new mytask().execute();
        pd.show();
    }
    //写一个继承AsyncTask，重写它的两个方法
    // 1、获取网络数据：doInBackground
    // 2、更新UI（数据）：onPostExecute
    class mytask extends AsyncTask{
 
        private UserEntity userEntity;
        private UserEntity userEntity1;
 
        @Override
        protected Object doInBackground(Object[] params)