从Tablayout中检索EditText值

时间：2016-03-13 18:32:16

标签： android android-edittext android-tablayout

我需要有关如何从tablayout中的edittext检索userinput值的帮助。我有4个选项卡，每个选项卡都有相同的editText小部件，这意味着我只实现了一个edittext视图。问题是，如果我在每个editText中放置一个值，我不知道如何检索它们，因为我不知道如何找到每个editText的位置，我甚至需要将它们放在我的数据库中，这是在sqlite中。有人会指导我吗感谢。

PS。如果需要，将添加代码。

编辑：

My_Notes_Add_Main.java 

package com.zaid.recyclerviewsqlite.addNotes;

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.ImageButton;

import com.zaid.recyclerviewsqlite.R;
import com.zaid.recyclerviewsqlite.mynote_databases.DatabaseHelper;
import com.zaid.recyclerviewsqlite.notes.DataModel;

public class My_Notes_Add_Main extends AppCompatActivity implements View.OnClickListener {

    private final int numOfPages = 4; //viewpager has 4 pages
    private final String[] pageTitle = {"Terms", "Definition", "Syntax", "Code"};
    private ImageButton addNew;

    My_Notes_Add_MyPagerAdapter adapter = new My_Notes_Add_MyPagerAdapter( null, numOfPages);

    DatabaseHelper db;


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

        db = new DatabaseHelper(this);        

        addNew = (ImageButton)findViewById(R.id.addNew);
        addNewTerms();

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar1);
        setSupportActionBar(toolbar);

        TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);

        for (int i = 0; i < numOfPages; i++) {
            tabLayout.addTab(tabLayout.newTab().setText(pageTitle[i]));
        }

        //set gravity for tab bar
        tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

        final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
        final PagerAdapter adapter = new My_Notes_Add_MyPagerAdapter(getSupportFragmentManager(), numOfPages);

        viewPager.setAdapter(adapter);
        viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
        tabLayout.setOnTabSelectedListener(onTabSelectedListener(viewPager));

    }

    private TabLayout.OnTabSelectedListener onTabSelectedListener(final ViewPager pager) {
        return new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                pager.setCurrentItem(tab.getPosition());
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {

            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        };
    }

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

    public void addNewTerms(){
        addNew.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub



                ArrayList<String> listNotes= new ArrayList<String>();
                for (int i = 0; i < adapter.getCount(); i++) {
                    My_Notes_Add_TabFragment fragment = adapter.getFragment(i);
                    if(fragment != null)
                        listNotes.add(fragment.getText());



                }

                DataModel model = new DataModel(listNotes.get(0),listNotes.get(1),
                                 listNotes.get(2),listNotes.get(3));

                db.InsertNewRecord(model); 
            }

    });
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

    }






}

My_Notes_Add_MyPagerAdapter.java 

package com.zaid.recyclerviewsqlite.addNotes;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.util.SparseArray;

public class My_Notes_Add_MyPagerAdapter extends FragmentStatePagerAdapter {
     int numOfTabs;
    private final SparseArray<Fragment> mPageReferences = new SparseArray<Fragment>();



    public My_Notes_Add_MyPagerAdapter(FragmentManager fm, int numOfTabs) {
        super(fm);
        this.numOfTabs = numOfTabs;
    }

    @Override
    public Fragment getItem(int position) {

        My_Notes_Add_TabFragment fragment = (My_Notes_Add_TabFragment) My_Notes_Add_TabFragment.getInstance(position);
        mPageReferences.put(position, fragment);
        return fragment;
    }

    public int getCount() {
        return numOfTabs;
    }

    public My_Notes_Add_TabFragment getFragment(int key) {
        return (My_Notes_Add_TabFragment) mPageReferences.get(key);
     }



    }

My_Notes_Add_TabFragment.java 

package com.zaid.recyclerviewsqlite.addNotes;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;

import com.zaid.recyclerviewsqlite.R;

public class My_Notes_Add_TabFragment extends Fragment {

    private int position;
    public TextView content;
    //private ImageView image;



    public static Fragment getInstance(int position) {
        My_Notes_Add_TabFragment f = new My_Notes_Add_TabFragment();
        Bundle args = new Bundle();
        args.putInt("position", position);
        f.setArguments(args);
        return f;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //get data from Argument
        position = getArguments().getInt("position");
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.my_notes_add_tab_fragment, container, false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);


        content = (EditText) view.findViewById(R.id.textView);





    }

    public String getText(){
           return content.getText().toString();
        }






}

DatabaseHelper.java 注意数据库的注释插入是为了测试我的数据库是否正常工作

package com.zaid.recyclerviewsqlite.mynote_databases;

import java.util.ArrayList;
import java.util.List;

import com.zaid.recyclerviewsqlite.notes.DataModel;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class DatabaseHelper extends SQLiteOpenHelper {

    public static final String DBASE = "my_notes";
    public static final String TBLMYNOTES = "tblnotes";
    public static final int DBVERSION = 1;
    public static final String NOTE_TERM = "note_term";
    public static final String NOTE_ID = "note_id";
    public static final String NOTE_DEF = "note_def";
    public static final String NOTE_SYNTAX = "note_syntax";
    public static final String NOTE_CODE = "note_code";

    public int currentID;

    public DatabaseHelper(Context context) {
        super(context, DBASE, null, DBVERSION);
        // TODO Auto-generated constructor stub
        SQLiteDatabase db = this.getWritableDatabase();

    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL("CREATE TABLE "+TBLMYNOTES+" ("+ NOTE_ID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+NOTE_TERM+" TEXT, "+NOTE_DEF+" TEXT, "+NOTE_SYNTAX+" TEXT, "+NOTE_CODE+" TEXT )");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TABLE IF EXISTS "+TBLMYNOTES);

        onCreate(db);
    }

    public void InsertNewRecord( DataModel datamodel ) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues db_values = new ContentValues();
        db_values.put(NOTE_TERM, datamodel.getTerm());
        db_values.put(NOTE_DEF, datamodel.getDefinition());
        db_values.put(NOTE_SYNTAX, datamodel.getSyntax());
        db_values.put(NOTE_CODE, datamodel.getCode());
        /** int countArr = values.size();

        for( int i = 0; i < countArr; i++  ) {

            db_values.put( fields.get(i), values.get(i) );

        }
*/      
        db.insert(TBLMYNOTES, null, db_values);

        db.close();
    }


    public Cursor getAllData(String tblname) {
        SQLiteDatabase db = this.getWritableDatabase();

        Cursor result = db.rawQuery("SELECT * FROM "+tblname, null);

        return result;
    }

    /**
     * @return
     */
    public List<DataModel> getAllDataModel(){

        List<DataModel> dataList = new ArrayList<DataModel>();
        String query = "SELECT * FROM " + TBLMYNOTES;

        SQLiteDatabase db = this.getWritableDatabase();
        Cursor c = db.rawQuery(query, null);

        while(c.moveToNext()){
            /**     DataModel model= new DataModel();
            model.setId(Integer.parseInt(c.getString(0)));
            model.setTerm(c.getString(1));
            model.setDefinition(c.getString(2));
            model.setSyntax(c.getString(3));
            model.setCode(c.getString(4));
    */  
            int index0 = c.getColumnIndex(NOTE_ID);
            int index1 = c.getColumnIndex(NOTE_TERM);
            int index2 = c.getColumnIndex(NOTE_DEF);
            int index3 = c.getColumnIndex(NOTE_SYNTAX);
            int index4 = c.getColumnIndex(NOTE_CODE);

            int id = c.getInt(index0);

            String term = c.getString(index1);
            String def = c.getString(index2);
            String syn = c.getString(index3);
            String code = c.getString(index4);
            DataModel model = new DataModel(id, term, def, syn, code);
            dataList.add(model);

        }

        return dataList;
    }

    public int DeleteRecord(String tblname, String strField, String strValue) {
        SQLiteDatabase db = this.getWritableDatabase();

        int status = db.delete(TBLMYNOTES , " "+strField+" = ? ", new String[] { strValue });

        return status;
    }

    public int UpdateRecord(String tblname, ArrayList<String> Fields, ArrayList<String> Values) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues db_values = new ContentValues();

        int countMaxArr = Fields.size();

        String strFieldID = Fields.get(0);
        String strFieldValue = Values.get(0);


        for( int i = 0; i < countMaxArr; i++ ) {

            db_values.put(Fields.get(i), Values.get(i));

        }

        int status = db.update(TBLMYNOTES, db_values, strFieldID+" = ? ", new String[] { strFieldValue });

        return status;
    }

    public void setcurrID(int ID) {     
        currentID = ID;
    }       

    public int getcurrID() {
        return currentID;
    }


    public Cursor getRecordByID(String tblname, String Fieldname, String Fieldvalue) {
        SQLiteDatabase db = this.getWritableDatabase();

        Cursor result = db.rawQuery("SELECT * FROM "+ TBLMYNOTES+" WHERE "+Fieldname+" = "+Fieldvalue, null);

        return result;

    }


}

DataModel.java 

package com.zaid.recyclerviewsqlite.notes;

public class DataModel {

    String term_;
    String definition_;
    int id_;
    String syntax_;
    String code_;

    public DataModel(){

    }

    public DataModel(int id, String term, String def, String syntax, String code) {
        this.term_ = term;
        this.id_ = id;
        this.definition_=def;
        this.syntax_=syntax;
        this.code_=code;
    }

    public DataModel(String term, String def, String syntax, String code) {
        this.term_ = term;
        this.definition_=def;
        this.syntax_=syntax;
        this.code_=code;
    }

    public String getTerm() {
        return term_;
    } 

    public String getDefinition(){
        return definition_;
    }

    public String getSyntax() {
        return syntax_;
    }

    public String getCode() {
        return code_;
    }


    public int getId() {
        return id_;
    }

    public void setTerm(String term){
        this.term_= term;
    }

    public void setId(int id){
        this.id_= id;
    }
    public void setDefinition(String definition){
        this.definition_= definition;
    }
    public void setSyntax(String syntax){
        this.syntax_= syntax;
    }
    public void setCode(String code){
        this.code_= code;
    }
}

logcat的

03-14 23:37:37.230: D/AndroidRuntime(4640): Shutting down VM
03-14 23:37:37.230: W/dalvikvm(4640): threadid=1: thread exiting with uncaught exception (group=0x55d52b20)
03-14 23:37:37.230: I/Process(4640): Sending signal. PID: 4640 SIG: 9
03-14 23:37:37.230: D/AndroidRuntime(4640): procName from cmdline: com.zaid.recyclerviewsqlite
03-14 23:37:37.230: E/AndroidRuntime(4640): in writeCrashedAppName, pkgName :com.zaid.recyclerviewsqlite
03-14 23:37:37.230: D/AndroidRuntime(4640): file written successfully with content: com.zaid.recyclerviewsqlite StringBuffer : ;com.zaid.recyclerviewsqlite
03-14 23:37:37.230: E/AndroidRuntime(4640): FATAL EXCEPTION: main
03-14 23:37:37.230: E/AndroidRuntime(4640): Process: com.zaid.recyclerviewsqlite, PID: 4640
03-14 23:37:37.230: E/AndroidRuntime(4640): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.zaid.recyclerviewsqlite/com.zaid.recyclerviewsqlite.addNotes.My_Notes_Add_Main}: java.lang.NullPointerException
03-14 23:37:37.230: E/AndroidRuntime(4640):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2121)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at android.os.Handler.dispatchMessage(Handler.java:102)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at android.os.Looper.loop(Looper.java:136)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at android.app.ActivityThread.main(ActivityThread.java:5021)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at java.lang.reflect.Method.invokeNative(Native Method)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at java.lang.reflect.Method.invoke(Method.java:515)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:827)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:643)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at dalvik.system.NativeStart.main(Native Method)
03-14 23:37:37.230: E/AndroidRuntime(4640): Caused by: java.lang.NullPointerException
03-14 23:37:37.230: E/AndroidRuntime(4640):     at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:256)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:224)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at com.zaid.recyclerviewsqlite.mynote_databases.DatabaseHelper.<init>(DatabaseHelper.java:30)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at com.zaid.recyclerviewsqlite.addNotes.My_Notes_Add_Main.<init>(My_Notes_Add_Main.java:24)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at java.lang.Class.newInstanceImpl(Native Method)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at java.lang.Class.newInstance(Class.java:1208)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at android.app.Instrumentation.newActivity(Instrumentation.java:1064)
03-14 23:37:37.230: E/AndroidRuntime(4640):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2112)
03-14 23:37:37.230: E/AndroidRuntime(4640):     ... 11 more

1 个答案:

答案 0 :(得分：1)

这是一个工作样本

public class My_Notes_Add_MyPagerAdapter extends FragmentPagerAdapter {
    int numOfTabs;
    private final SparseArray<Fragment> mPageReferences = new SparseArray<>();

    public My_Notes_Add_MyPagerAdapter(FragmentManager fm, int numOfTabs) {
        super(fm);
        this.numOfTabs = numOfTabs;
    }

    @Override
    public Fragment getItem(int position) {
       My_Notes_Add_TabFragment fragment = My_Notes_Add_TabFragment.getInstance(position);
       mPageReferences.put(position, fragment);
       return     }

    @Override
    public int getCount() {
        return numOfTabs;
    }   

    public My_Notes_Add_TabFragment getFragment(int key) {
       return (My_Notes_Add_TabFragment) mPageReferences.get(key);
    }

}

在您的片段My_Notes_Add_TabFragment.java中添加getText方法

public String getText(){
   return content.getText().toString();
}

如何使用它。在你的My_Notes_Add_Main.java

中 
@Override
public void onClick(View v) {
    List<String> listNotes= new ArrayList<>();
    for (int i = 0; i < adapter.getCount(); i++) {
        My_Notes_Add_TabFragment fragment = adapter.getFragment(i);
        if(fragment != null)
            listNotes.add(fragment.getText());
        else{
            Toast.makeText(this,
                            "You need to fill " + pageTitle[i], Toast.LENGTH_LONG)
                            .show();
            return;
        }
    }

    DataModel model = new DataModel(yourId,listNotes.get(0),listNotes.get(1),
                     listNotes.get(2),listNotes.get(3))
    //create your save to DB method with listText parameter
    yourSaveToDB(listNotes);
}

希望它有所帮助!!

相关问题
最新问题