Android SQLite 将 gridview 中选择的 Item 传递给另一个 Activity 进行编辑

Question

基本上我有一个包含帐户的数据库。我使用 GridView 查看它们，您可以从那里选择一个 Account，它会将您定向到我的 Activity AccountManagement，您可以在其中进行修改，从 GridView 中删除或仅查看所选 Account 的所有详细信息。

我的问题是将数据从 GridView 中的选择传递到 AccountManagement。我不完全确定如何正确地使用 Intents。到目前为止，下面的代码不起作用，因为我不知道如何将数据传递到我的 AccountManagement 并从那里正确引用它。

代码在这里，任何带有 Acc 的东西都是有问题的，因为 Acc 是我应该从 GridView 中放置数据的地方。我用很长的 ------ 标记了所有这些行，以便更容易识别。随时询问任何缺少的代码。

在下面编辑最终代码以供引用。

AccountManagement fragment :

public class AccountDetails extends Activity {

DatabaseHelper dbHelper;
static public LinearLayout Linlay;
EditText txtName;
EditText txtAmt;
EditText txtPurpose;
TextView txtDate;
TextView txtEditDate;
Spinner spinStat;
Spinner spinTerm;

@Override
public void onCreate(Bundle savedInstanceState) {

    Intent intent = getIntent();
    Bundle bundle = intent.getExtras();

    super.onCreate(savedInstanceState);
    setContentView(R.layout.accdetails);

    Linlay = (LinearLayout) findViewById(R.id.Linlay);
    spinStat = (Spinner) findViewById(R.id.spinStat);
    spinTerm = (Spinner) findViewById(R.id.spinTerm);
    txtName = (EditText) findViewById(R.id.txtDelName);
    txtAmt = (EditText) findViewById(R.id.txtDelAmt);
    txtPurpose = (EditText) findViewById(R.id.txtDelPurpose);
    spinTerm = (Spinner) findViewById(R.id.spinTerm);
    txtDate = (TextView) findViewById(R.id.colDate);
    txtEditDate = (TextView) findViewById(R.id.colEditDate);
    spinStat = (Spinner) findViewById(R.id.spinStat);


    Utilities.ManageTermSpinner(AccountDetails.this, spinTerm);
    for(int i=0;i<spinTerm.getCount();i++)
    {
        long id=spinTerm.getItemIdAtPosition(i);
        if(id==Acc.getTerms())--------------------------------------------
        {
            spinTerm.setSelection(i, true);
            break;
        }
    }

    Utilities.ManageStatSpinner(AccountDetails.this, spinStat);
    for(int j=0;j<spinStat.getCount();j++)
    {
        long id=spinStat.getItemIdAtPosition(j);
        if(id==Acc.getStatus())--------------------------------------------
        {
            spinStat.setSelection(j, true);
            break;
        }
    }


    txtName.setText(Acc.getName());---------------------------------------
    txtAmt.setText(String.valueOf(Acc.getAmt()));-------------------------
    txtPurpose.setText(Acc.getPurpose());---------------------------------



    Button delete = (Button) findViewById(R.id.delete);
    delete.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            AlertDialog diag = Alerts.DeleteConfirm(AccountDetails.this, Acc );--------------------------------
            diag.show();
        }
    });
}

GridView fragment :

这是我应该将数据放入 Acc 的地方，但我不确定如何，所以这里的所有内容都可以更改，因为我不确定这是否是理想的方式做吧。

        try {
        grid.setOnItemClickListener(new OnItemClickListener() {

            @Override
                public void onItemClick(AdapterView<?> parent, View v, int position,
                                                                long id) {
                try {



                    SQLiteCursor cr = (SQLiteCursor) parent.getItemAtPosition(position);
                    String name = cr.getString(cr.getColumnIndex(DatabaseHelper.colName));
                    int amount = cr.getInt(cr.getColumnIndex(DatabaseHelper.colAmount));
                    String purpose = cr.getString(cr.getColumnIndex(DatabaseHelper.colPurpose));
                    String Terms = cr.getString(cr.getColumnIndex(DatabaseHelper.colTermsClass));
                    String Status = cr.getString(cr.getColumnIndex(DatabaseHelper.colStatClass));
                    String date = cr.getString(cr.getColumnIndex(DatabaseHelper.colDate));
                    String editdate = cr.getString(cr.getColumnIndex(DatabaseHelper.colEditDate));
                    Account acc = new Account(name, amount, purpose, db.GetTermsID(Terms),date,editdate,db.GetStatID(Status));
                    acc.SetID((int) id);

                    Intent myIntent = new Intent(AccountManager.this, AccountDetails.class);
                    Bundle extras = new Bundle();
                    myIntent.putExtras(extras);
                    startActivityForResult(myIntent, 0);


                    } catch (Exception ex) {
                           Alerts.CatchError(AccountManager.this, ex.toString());
                    }
                }


        });
    } catch (Exception ex) {

    }

编辑:

GridView 最终 fragment :

        try {
        grid.setOnItemClickListener(new OnItemClickListener() {

            @Override
                public void onItemClick(AdapterView<?> parent, View v, int position,
                                                                long id) {
                try {



                    SQLiteCursor cr = (SQLiteCursor) parent.getItemAtPosition(position);
                    String name = cr.getString(cr.getColumnIndex(DatabaseHelper.colName));
                    int amount = cr.getInt(cr.getColumnIndex(DatabaseHelper.colAmount));
                    String purpose = cr.getString(cr.getColumnIndex(DatabaseHelper.colPurpose));
                    String Terms = cr.getString(cr.getColumnIndex(DatabaseHelper.colTermsClass));
                    String Status = cr.getString(cr.getColumnIndex(DatabaseHelper.colStatClass));
                    String date = cr.getString(cr.getColumnIndex(DatabaseHelper.colDate));
                    String editdate = cr.getString(cr.getColumnIndex(DatabaseHelper.colEditDate));
                    Account acc = new Account(name, amount, purpose, db.GetTermsID(Terms),date,editdate,db.GetStatID(Status));
                    acc.SetID((int) id);


                    Intent myIntent = new Intent(AccountManager.this, AccountDetails.class);
                    myIntent.putExtra("AccountObject", acc);
                    startActivityForResult(myIntent, 0);


                    } catch (Exception ex) {
                           Alerts.CatchError(AccountManager.this, ex.toString());
                    }
                }


        });
    } catch (Exception ex) {

    }

AccountManagement 最终 fragment :

 @Override
public void onCreate(Bundle savedInstanceState) {


    final Account Acc = (Account) getIntent().getSerializableExtra("AccountObject");

    super.onCreate(savedInstanceState);
    setContentView(R.layout.accdetails);

    Linlay = (LinearLayout) findViewById(R.id.Linlay);
    spinStat = (Spinner) findViewById(R.id.spinStat);
    spinTerm = (Spinner) findViewById(R.id.spinTerm);
    txtName = (EditText) findViewById(R.id.txtDelName);
    txtAmt = (EditText) findViewById(R.id.txtDelAmt);
    txtPurpose = (EditText) findViewById(R.id.txtDelPurpose);
    spinTerm = (Spinner) findViewById(R.id.spinTerm);
    txtDate = (TextView) findViewById(R.id.colDate);
    txtEditDate = (TextView) findViewById(R.id.colEditDate);
    spinStat = (Spinner) findViewById(R.id.spinStat);


    Utilities.ManageTermSpinner(AccountDetails.this, spinTerm);
    for(int i=0;i<spinTerm.getCount();i++)
    {
        long id=spinTerm.getItemIdAtPosition(i);
        if(id==Acc.getTerms())
        {
            spinTerm.setSelection(i, true);
            break;
        }
    }

    Utilities.ManageStatSpinner(AccountDetails.this, spinStat);
    for(int j=0;j<spinStat.getCount();j++)
    {
        long id=spinStat.getItemIdAtPosition(j);
        if(id==Acc.getStatus())
        {
            spinStat.setSelection(j, true);
            break;
        }
    }


    txtName.setText(Acc.getName());
    txtAmt.setText(String.valueOf(Acc.getAmt()));
    txtPurpose.setText(Acc.getPurpose());



    Button delete = (Button) findViewById(R.id.delete);
    delete.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            AlertDialog diag = Alerts.DeleteConfirm(AccountDetails.this, Acc );
            diag.show();
        }
    });

    Button modify = (Button) findViewById(R.id.modify);
    modify.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
           AlertDialog diag = Alerts.ShowEditDialog(AccountDetails.this, Acc);
           diag.show();
        }
    });
}

Answer 1

您并没有将该“acc”对象放入 Bundle 中，而是在此处以空 Intent 启动 AccountDetails Activity 。

这是一个例子:Send object from one activity to another Activity using Intent