如何将联系人备份为.csv或.vcf android

Question

我是android开发新手。我正在创建联系人备份应用程序。联系人如何在android中备份什么工作过程在这里.please解释一些。在此也恢复 在此使用何种方法和过程解释我

Answer 1

对于备份：

1. 向联系人从用户的读取权限。
2. 逐个阅读联系人并创建一个VCF文件。

对于恢复：

1. 向联系人从用户的写权限。
2. 阅读VCF文件并解析它。
3. 根据VCF文件中的内容创建联系人。

Answer 2

package com.example.dekrinssoft.contactsbackup; 
import android.app.ProgressDialog; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.content.res.AssetFileDescriptor; 
import android.database.Cursor; 
import android.net.Uri; 
import android.os.AsyncTask; 
import android.os.Environment; 
import android.provider.ContactsContract; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.webkit.MimeTypeMap; 
import android.widget.Button; 
import android.widget.Toast; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.util.ArrayList; 

public class MainActivity extends AppCompatActivity { 
Button backup, restore; 
String vfile; 
FileOutputStream mFileOutputStream = null; 
Cursor cursor; 
ArrayList<String> vCard; 
File f; 
String storage_path; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    backup = (Button) findViewById(R.id.btnbkp); 
    restore = (Button) findViewById(R.id.btnres); 

    vfile = "contacts.vcf"; 
    storage_path = Environment.getExternalStorageDirectory().toString() + "/" + vfile; 
    f = new File(storage_path); 


    backup.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

      new LongOperation().execute(""); 

     } 
    }); 
    restore.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      final Intent intent = new Intent(); 

      final MimeTypeMap mime = MimeTypeMap.getSingleton(); 
      String tmptype = mime.getMimeTypeFromExtension("vcf"); 
      final File file = new File(Environment.getExternalStorageDirectory().toString() + "/contacts.vcf"); 

      intent.setDataAndType(Uri.fromFile(file), tmptype); 
      startActivity(intent); 
     } 
    }); 

} 

private class LongOperation extends AsyncTask<String, Void, String> { 

    ProgressDialog progress; 

    @Override 
    protected void onPreExecute() { 
     progress = new ProgressDialog(MainActivity.this); 
     progress.setMessage("Loading.... "); 
     progress.setProgressStyle(ProgressDialog.STYLE_SPINNER); 
     progress.setIndeterminate(true); 
     progress.setProgress(0); 
     progress.show(); 
    } 

    @Override 
    protected String doInBackground(String... params) { 
     try { 
      if (!f.exists()) 
       f.createNewFile(); 
      mFileOutputStream = new FileOutputStream(storage_path, false); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
     getVcardString(); 
     return "Executed"; 
    } 

    @Override 
    protected void onPostExecute(String result) { 
     Toast.makeText(MainActivity.this, " Succesfully backed up", Toast.LENGTH_LONG).show(); 
     progress.dismiss(); 
    } 

} 

private void getVcardString() { 
    vCard = new ArrayList<String>(); 
    cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null); 
    if (cursor != null && cursor.getCount() > 0) { 
     cursor.moveToFirst(); 
     for (int i = 0; i < cursor.getCount(); i++) { 

      get(cursor); 
      Log.d("TAG", "Contact " + (i + 1) + "VcF String is" + vCard.get(i)); 
      cursor.moveToNext(); 
     } 

    } else { 
     Log.d("TAG", "No Contacts in Your Phone"); 
    } 
    try { 
     mFileOutputStream.close(); 
    } catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 

} 

public void get(Cursor cursor) { 
    //cursor.moveToFirst(); 
    String lookupKey = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.LOOKUP_KEY)); 
    Uri uri = Uri.withAppendedPath(ContactsContract.Contacts.CONTENT_VCARD_URI, lookupKey); 
    AssetFileDescriptor fd; 
    try { 
     fd = this.getContentResolver().openAssetFileDescriptor(uri, "r"); 
     FileInputStream fis = fd.createInputStream(); 
     byte[] buf = new byte[(int) fd.getDeclaredLength()]; 
     fis.read(buf); 
     String vcardstring = new String(buf); 
     vCard.add(vcardstring); 

     mFileOutputStream.write(vcardstring.toString().getBytes()); 

    } catch (Exception e1) { 
     // TODO Auto-generated catch block 
     e1.printStackTrace(); 
    } 
} 


@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_main, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_settings) { 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 
} 

这是代码联系备份在Android开发 任何感觉只要按一下按钮打勾， 如果引发的任何错误，问我有用，我跑它成功运行 如果你想检查。这是我的应用程序链接 click to see my app