在 Android 中读取外部 XML 文件

Question

如何在 android 应用程序中读取外部 XML 文件的此类数据并在视图中设置

<?XML version="1.0"?>  
<OKV
r="129120190116115414009" 
a="Address" g="male" m="123456" 
e="email" d="14021996" i="imagelink" 
n="My Name" v="1"/>

Answer 1

对于上面的 xml 示例，您可以尝试下面的解析器

public class MainActivity extends Activity {

    ArrayList<String> r_no;
    int count;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         r_no = new ArrayList<String>();

         try {
         File file = new File("mnt/sdcard/yourxmlfile.xml");
         InputStream is = new FileInputStream(file.getPath());
         DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
         DocumentBuilder db = dbf.newDocumentBuilder();
         Document doc = db.parse(new InputSource(is));
         doc.getDocumentElement().normalize();

         NodeList n = doc.getElementsByTagName("OKV");

         for (int j = 0; j < n.getLength(); j++) {
             Node node = n.item(j);

             Element fstElmnt = (Element) node;

             r_no.add(fstElmnt.getAttribute("r"));

        }
     } catch (Exception e) {
         System.out.println("XML Pasing Excpetion = " + e);
     }
 }
}

更多信息请查看official Document

Answer 2

Android

中的XML有3种解析方式

DOM Parsers
SAX Parsers
XMLPullParser

按照以下步骤操作

首先，在清单文件

中添加READ_EXTERNAL_STORAGE的权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

然后检查 runtime permission android 棉花糖及以上

Because Beginning in Android 6.0 (API level 23), users grant permissions to apps while the app is running, not when they install the app

 int grant = ContextCompat.checkSelfPermission(this, permission);
 if (grant != PackageManager.PERMISSION_GRANTED) {
     String[] permission_list = new String[1];
     permission_list[0] = permission;
     ActivityCompat.requestPermissions(this, permission_list, 1);
 }

然后解析你的xml

这里是使用DOM Parsers

的示例代码

示例代码

Create a model class

public class Model {

    String rValue, aValue, eValue, nValue, gValue, dValue, vValue, mValue, iValue;

    public String getrValue() {
        return rValue;
    }

    public void setrValue(String rValue) {
        this.rValue = rValue;
    }

    public String getaValue() {
        return aValue;
    }

    public void setaValue(String aValue) {
        this.aValue = aValue;
    }

    public String geteValue() {
        return eValue;
    }

    public void seteValue(String eValue) {
        this.eValue = eValue;
    }

    public String getnValue() {
        return nValue;
    }

    public void setnValue(String nValue) {
        this.nValue = nValue;
    }

    public String getgValue() {
        return gValue;
    }

    public void setgValue(String gValue) {
        this.gValue = gValue;
    }

    public String getdValue() {
        return dValue;
    }

    public void setdValue(String dValue) {
        this.dValue = dValue;
    }

    public String getvValue() {
        return vValue;
    }

    public void setvValue(String vValue) {
        this.vValue = vValue;
    }

    public String getmValue() {
        return mValue;
    }

    public void setmValue(String mValue) {
        this.mValue = mValue;
    }

    public String getiValue() {
        return iValue;
    }

    public void setiValue(String iValue) {
        this.iValue = iValue;
    }
}

MainActivity code

public class MainActivity extends AppCompatActivity {

    List<Model> modelArrayList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // first check for runtime permission
        String permission = Manifest.permission.READ_EXTERNAL_STORAGE;
        int grant = ContextCompat.checkSelfPermission(this, permission);
        if (grant != PackageManager.PERMISSION_GRANTED) {
            String[] permission_list = new String[1];
            permission_list[0] = permission;
            ActivityCompat.requestPermissions(this, permission_list, 1);
        }else {
            ParseXML();
        }

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == 1) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(MainActivity.this, "READ_EXTERNAL_STORAGE permission granted", Toast.LENGTH_SHORT).show();
                ParseXML();
            } else {
                Toast.makeText(MainActivity.this, " READ_EXTERNAL_STORAGE permission not granted", Toast.LENGTH_SHORT).show();
            }
        }

    }

    private void ParseXML() {

        File dir = Environment.getExternalStorageDirectory();
        File yourFile = new File(dir, "test.xml");

        DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder dBuilder;

        try {

            dBuilder = dbFactory.newDocumentBuilder();
            Document doc = dBuilder.parse(yourFile);
            doc.getDocumentElement().normalize();

            Log.e("Root_element" , doc.getDocumentElement().getNodeName());
            NodeList nodeList = doc.getElementsByTagName("OKV");

            modelArrayList = new ArrayList<Model>();


            for (int i = 0; i < nodeList.getLength(); i++) {

                Element element = (Element) nodeList.item(i);

                Model model = new Model();
                model.setrValue(element.getAttribute("r"));
                model.setaValue(element.getAttribute("a"));
                model.setgValue(element.getAttribute("g" ));
                model.setmValue(element.getAttribute("m" ));
                model.seteValue(element.getAttribute("e" ));
                model.setdValue(element.getAttribute("d" ));
                model.setiValue(element.getAttribute("i"));
                model.setnValue(element.getAttribute("n" ));
                model.setvValue(element.getAttribute("v"));

                modelArrayList.add(model);



            }

            for (int i = 0; i < modelArrayList.size(); i++) {

                Log.e("DATA_VALUE", modelArrayList.get(i).getaValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).getdValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).geteValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).getnValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).getvValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).getgValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).getrValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).getiValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).getmValue());
            }
        } catch (SAXException | ParserConfigurationException | IOException e1) {
            e1.printStackTrace();
        }

    }


}

输出

01-19 13:23:39.545 15689-15689/neel.com.demo E/Root_element: OKV
01-19 13:23:39.545 15689-15689/neel.com.demo E/DATA_VALUE: Address
01-19 13:23:39.545 15689-15689/neel.com.demo E/DATA_VALUE: 14021996
01-19 13:23:39.545 15689-15689/neel.com.demo E/DATA_VALUE: email
01-19 13:23:39.545 15689-15689/neel.com.demo E/DATA_VALUE: My Name
01-19 13:23:39.545 15689-15689/neel.com.demo E/DATA_VALUE: 1
01-19 13:23:39.545 15689-15689/neel.com.demo E/DATA_VALUE: male
01-19 13:23:39.545 15689-15689/neel.com.demo E/DATA_VALUE: 129120190116115414009
01-19 13:23:39.545 15689-15689/neel.com.demo E/DATA_VALUE: imagelink
01-19 13:23:39.545 15689-15689/neel.com.demo E/DATA_VALUE: 123456

for more information please check below article

更新

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;


import com.nbsp.materialfilepicker.MaterialFilePicker;
import com.nbsp.materialfilepicker.ui.FilePickerActivity;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;


public class MainActivity extends AppCompatActivity {

    List<Model> modelArrayList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        // first check for runtime permission
        String permission = Manifest.permission.READ_EXTERNAL_STORAGE;
        int grant = ContextCompat.checkSelfPermission(this, permission);
        if (grant != PackageManager.PERMISSION_GRANTED) {
            String[] permission_list = new String[1];
            permission_list[0] = permission;
            ActivityCompat.requestPermissions(this, permission_list, 1);
        } else {
            pickFile();
        }
    }

    private void pickFile() {
        new MaterialFilePicker()
                .withActivity(this)
                .withRequestCode(1)
                .withFilterDirectories(true)
                .withHiddenFiles(true)
                .start();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 1 && resultCode == RESULT_OK) {

            String filePath = data.getStringExtra(FilePickerActivity.RESULT_FILE_PATH);
            Log.e("FILE_PATH", filePath);
            ParseXML(filePath);
        }

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == 1) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(MainActivity.this, "READ_EXTERNAL_STORAGE permission granted", Toast.LENGTH_SHORT).show();

                pickFile();
            } else {
                Toast.makeText(MainActivity.this, " READ_EXTERNAL_STORAGE permission not granted", Toast.LENGTH_SHORT).show();
            }
        }

    }

    private void ParseXML(String path) {


        File yourFile = new File(path);

        DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder dBuilder;

        try {

            dBuilder = dbFactory.newDocumentBuilder();
            Document doc = dBuilder.parse(yourFile);
            doc.getDocumentElement().normalize();

            Log.e("Root_element", doc.getDocumentElement().getNodeName());
            NodeList nodeList = doc.getElementsByTagName("OKV");

            modelArrayList = new ArrayList<Model>();


            for (int i = 0; i < nodeList.getLength(); i++) {

                Element element = (Element) nodeList.item(i);

                Model model = new Model();
                model.setrValue(element.getAttribute("r"));
                model.setaValue(element.getAttribute("a"));
                model.setgValue(element.getAttribute("g"));
                model.setmValue(element.getAttribute("m"));
                model.seteValue(element.getAttribute("e"));
                model.setdValue(element.getAttribute("d"));
                model.setiValue(element.getAttribute("i"));
                model.setnValue(element.getAttribute("n"));
                model.setvValue(element.getAttribute("v"));

                modelArrayList.add(model);


            }

            for (int i = 0; i < modelArrayList.size(); i++) {

                Log.e("DATA_VALUE", modelArrayList.get(i).getaValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).getdValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).geteValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).getnValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).getvValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).getgValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).getrValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).getiValue());
                Log.e("DATA_VALUE", modelArrayList.get(i).getmValue());
            }
        } catch (SAXException | ParserConfigurationException | IOException e1) {
            e1.printStackTrace();
        }

    }


}

注意我使用的文件选择器 AndroidFileExplorer

在 Android 中读取外部 XML 文件

read external XML files in Android

android

xml

xml-parsing

android-xml

更新