聯繫人android應用程序開發

Question

我寫了添加聯繫人Android應用程序，其中包含一個名稱字段和一個號碼字段和保存按鈕，當輸入名稱和號碼，然後按保存按鈕它會將該聯繫人添加到聯繫人列表..它工作正常..但是當你沒有輸入任何東西，並按保存按鈕它保存與「noname」的聯繫..爲此我寫了如果和其他條件，但它不工作..請給我解決方案 這是我的源代碼：

package com.example.contacts; 

    import java.util.ArrayList; 

    import android.app.Activity; 
    import android.content.ContentProviderOperation; 
    import android.os.Bundle; 
    import android.provider.ContactsContract; 
    import android.view.Menu; 
    import android.view.View; 
    import android.widget.EditText; 
    import android.widget.Toast; 
    //import android.view.Menu; 

    public class ContactDetails extends Activity { 

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


     @Override 
     public boolean onCreateOptionsMenu(Menu menu) { 
      // Inflate the menu; this adds items to the action bar if it is present. 
      getMenuInflater().inflate(R.menu.contact_details, menu); 
      return true; 
     } 
     public void onSave(View view) 
     { 
      EditText mytext=(EditText)findViewById(R.id.editText1); 
      String name=mytext.getText().toString(); 
      Toast.makeText(this,name,Toast.LENGTH_LONG).show(); 
      EditText mytext1=(EditText)findViewById(R.id.editText2); 
      String number=mytext1.getText().toString(); 
      Toast.makeText(this,number,Toast.LENGTH_LONG).show(); 
      ArrayList <ContentProviderOperation> ops = new ArrayList <ContentProviderOperation>(); 

      ops.add(ContentProviderOperation.newInsert(
      ContactsContract.RawContacts.CONTENT_URI) 
       .withValue(ContactsContract.RawContacts.ACCOUNT_TYPE, null) 
       .withValue(ContactsContract.RawContacts.ACCOUNT_NAME, null) 
       .build()); 
       if (name != "") { 
       ops.add(ContentProviderOperation.newInsert(
       ContactsContract.Data.CONTENT_URI) 
        .withValueBackReference(ContactsContract.Data.RAW_CONTACT_ID, 0) 
        .withValue(ContactsContract.Data.MIMETYPE, 
       ContactsContract.CommonDataKinds.StructuredName.CONTENT_ITEM_TYPE) 
        .withValue(
       ContactsContract.CommonDataKinds.StructuredName.DISPLAY_NAME, 
       name).build()); 
      } 
       else 
       { 
        Toast.makeText(this, "Enter Valid Name",Toast.LENGTH_LONG).show(); 
        return; 
       } 


      if (number != null) { 
       ops.add(ContentProviderOperation. 
       newInsert(ContactsContract.Data.CONTENT_URI) 
        .withValueBackReference(ContactsContract.Data.RAW_CONTACT_ID, 0) 
        .withValue(ContactsContract.Data.MIMETYPE, 
       ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE) 
        .withValue(ContactsContract.CommonDataKinds.Phone.NUMBER, number) 
        .withValue(ContactsContract.CommonDataKinds.Phone.TYPE, 
       ContactsContract.CommonDataKinds.Phone.TYPE_MOBILE) 
        .build()); 
      } 
      else 
      { 
       Toast.makeText(this, "Enter Valid Number",Toast.LENGTH_LONG).show(); 
       return; 
     }     
      try { 
       getContentResolver().applyBatch(ContactsContract.AUTHORITY, ops); 
        Toast.makeText(this,"Contact Added",Toast.LENGTH_LONG).show(); 
      } catch (Exception e) { 
       e.printStackTrace(); 
       Toast.makeText(this, "Exception: " + e.getMessage(), Toast.LENGTH_SHORT).show(); 
      } 
     } 
     public void onCancel(View v) 
     {`enter code here` 
      EditText et1=(EditText) findViewById(R.id.editText1); 
      et1.setText(""); 
      EditText et2=(EditText) findViewById(R.id.editText2); 
      et2.setText(""); 
     } 
    } 

Answer 1

嘗試使用檢查字符串這樣

if ((!name.equals("")) && name !=null) { 
       ops.add(ContentProviderOperation.newInsert(
       ContactsContract.Data.CONTENT_URI) 
        .withValueBackReference(ContactsContract.Data.RAW_CONTACT_ID, 0) 
        .withValue(ContactsContract.Data.MIMETYPE, 
       ContactsContract.CommonDataKinds.StructuredName.CONTENT_ITEM_TYPE) 
        .withValue(
       ContactsContract.CommonDataKinds.StructuredName.DISPLAY_NAME, 
       name).build()); 
      } 
       else 
       { 
        Toast.makeText(this, "Enter Valid Name",Toast.LENGTH_LONG).show(); 
        return; 
       } 


      if (!(number.equals("")) && number !=null) { 
       ops.add(ContentProviderOperation. 
       newInsert(ContactsContract.Data.CONTENT_URI) 
        .withValueBackReference(ContactsContract.Data.RAW_CONTACT_ID, 0) 
        .withValue(ContactsContract.Data.MIMETYPE, 
       ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE) 
        .withValue(ContactsContract.CommonDataKinds.Phone.NUMBER, number) 
        .withValue(ContactsContract.CommonDataKinds.Phone.TYPE, 
       ContactsContract.CommonDataKinds.Phone.TYPE_MOBILE) 
        .build()); 
      } 
      else 
      { 
       Toast.makeText(this, "Enter Valid Number",Toast.LENGTH_LONG).show(); 
       return; 
     }