将数据从一个活动传输到另一个活

时间：2016-02-19 05:22:49

标签： android android-intent android-activity

我想将第一个活动中的微调器组件的值传递给第二个活动中的sqlite查询。通过Spinner实现价值。

第一项活动 - Filtro_Activity 

package br.exemplosqlite;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;

public class Filtro_Activity extends Activity implements      AdapterView.OnItemSelectedListener {

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

    //referencia a Spinner
    //Spinner coligada;

    //final TextView nome = (TextView)findViewById(R.id.txvNome);
    //final TextView sobrenome = (TextView)findViewById(R.id.txvSobrenome);
    //final Spinner pday = (Spinner)findViewById(R.id.spinner);
    final Spinner spcoligada = (Spinner)findViewById(R.id.coligada);
    final Spinner spfilial = (Spinner)findViewById(R.id.filial);
    final Spinner splestoque = (Spinner)findViewById(R.id.lestoque);
    final Spinner spgprodutos = (Spinner)findViewById(R.id.gprodutos);
    final Spinner spsubprodutos = (Spinner)findViewById(R.id.subproduto);
    final Spinner spclprodutos = (Spinner)findViewById(R.id.clprodutos);



    //spinner = (Spinner)findViewById(R.id.spinner);

    ArrayAdapter adaptercoligada=ArrayAdapter.createFromResource(this, R.array.coligada, android.R.layout.simple_spinner_item);
    spcoligada.setAdapter(adaptercoligada);

    ArrayAdapter adapterfilial=ArrayAdapter.createFromResource(this, R.array.filial, android.R.layout.simple_spinner_item);
    spfilial.setAdapter(adapterfilial);

    ArrayAdapter adapterlestoque=ArrayAdapter.createFromResource(this, R.array.lestoque, android.R.layout.simple_spinner_item);
    splestoque.setAdapter(adapterlestoque);

    ArrayAdapter adaptergprodutos=ArrayAdapter.createFromResource(this, R.array.gprodutos, android.R.layout.simple_spinner_item);
    spgprodutos.setAdapter(adaptergprodutos);

    ArrayAdapter adaptersubprodutos=ArrayAdapter.createFromResource(this, R.array.subproduto, android.R.layout.simple_spinner_item);
    spsubprodutos.setAdapter(adaptersubprodutos);

    ArrayAdapter adapterclprodutos=ArrayAdapter.createFromResource(this, R.array.clprodutos, android.R.layout.simple_spinner_item);
    spclprodutos.setAdapter(adapterclprodutos);

    Button ok = (Button)findViewById(R.id.btnok);


    ok.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //chamada para a nova Activity
            Intent intent = new Intent(Filtro_Activity.this, ListUsersActivity1.class);
            intent.putExtra("coligada", spcoligada.getSelectedItem().toString());
            intent.putExtra("filial", spfilial.getSelectedItem().toString());
            intent.putExtra("lestoque", splestoque.getSelectedItem().toString());
            intent.putExtra("gprodutos", spgprodutos.getSelectedItem().toString());
            intent.putExtra("subprodutos", spsubprodutos.getSelectedItem().toString());
            intent.putExtra("clprodutos", spclprodutos.getSelectedItem().toString());

            //intent.putExtra("nomePessoa", nome.getText().toString());
            //intent.putExtra("sobrenomePessoa", sobrenome.getText().toString());
            //intent.putExtra("day", pday.getSelectedItem().toString());

            startActivity(intent);
        }
    });
}

@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

}

@Override
public void onNothingSelected(AdapterView<?> parent) {

}

}

另一项活动是：

package br.exemplosqlite;

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

import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

public class BD extends Activity {





private SQLiteDatabase bd;

public BD(Context context) {
    BDCore auxBd = new BDCore(context);
    bd = auxBd.getWritableDatabase();
}



public List<Produtos> buscar2() {

    List<Produtos> list = new ArrayList<Produtos>();
    String[] colunas = new String[]{"_id","item", "coligada","filial"};
    //String whereclausula = "coligada = 'issue'";

    Cursor cursor = bd.rawQuery("select * from produtos2 ", null);
    //Cursor cursor = bd.query("produtos", colunas,null, null, null, null,null);
    if (cursor.getCount() > 0) {
        cursor.moveToFirst();
        do {

            Produtos p = new Produtos();
            p.setId(cursor.getLong(0));
            p.setItem(cursor.getString(1));
            p.setColigada(cursor.getString(2));
            p.setFilial(cursor.getString(3));
            list.add(p);

        } while (cursor.moveToNext());
    }

    return (list);
 }

如您所见，第二个活动有一个db.query，我想用第一个活动的微调器值修改它。这是可能的，最好的方法是什么？

4 个答案:

答案 0 :(得分：1)

您是否想通过选择coligada的值来使用代码中的where子句？

编辑答案

Filtro_Activity

中的

像这样编辑你的确定按钮

Button ok = (Button)findViewById(R.id.btnok);
ok.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        //chamada para a nova Activity

        Intent intent = new Intent(Filtro_Activity.this, BD.class);
        Bundle extras = new Bundle();
        extras.putString("coligada", spcoligada.getSelectedItem().toString());
        intent.putExtras(extras);
        startActivity(intent);
    }
});

在onCreate（Bundle savedInstanceState）中的 BD类/活动中;在setContentView之后放了这个

Bundle extras = getIntent().getExtras();
String coligada = extras.getString("coligada");
List<Produtos> list = buscar2(coligada);

coligada字符串像这样传递给这个函数

public List<Produtos> buscar2(String coligada) {

List<Produtos> list = new ArrayList<Produtos>();
String[] colunas = new String[]{"_id","item", "coligada","filial"};
//String whereclausula = "coligada = 'issue'";

Cursor cursor = bd.rawQuery("select * from produtos2 where coligada = ? ", new String[] {coligada});
//Cursor cursor = bd.query("produtos", colunas,null, null, null, null,null);
if (cursor.getCount() > 0) {
    cursor.moveToFirst();
    do {

        Produtos p = new Produtos();
        p.setId(cursor.getLong(0));
        p.setItem(cursor.getString(1));
        p.setColigada(cursor.getString(2));
        p.setFilial(cursor.getString(3));
        list.add(p);

    } while (cursor.moveToNext());
}
cursor.close()
return (list);
}

更新后的答案检查从此行开始

更新 BD Class ，如下面的代码

public class BD {

    private SQLiteDatabase bd;
    private String coligada;

    public BD(Context context, String coligada) {
        BDCore auxBd = new BDCore(context);
        this.bd = auxBd.getWritableDatabase();
        this.coligada = coligada;
    }

    public static BD newInstance(Context context, String coligada){
        return new BD(context, coligada);
    }

public List<Produtos> buscar2() {

    List<Produtos> list = new ArrayList<Produtos>();
    String[] colunas = new String[]{"_id","item", "coligada","filial"};
//String whereclausula = "coligada = 'issue'";

    Cursor cursor = bd.rawQuery("select * from produtos2 where coligada = ? ", new String[] {coligada});
//Cursor cursor = bd.query("produtos", colunas,null, null, null, null,null);
    if (cursor.getCount() > 0) {
        cursor.moveToFirst();
        do {

            Produtos p = new Produtos();
            p.setId(cursor.getLong(0));
            p.setItem(cursor.getString(1));
            p.setColigada(cursor.getString(2));
            p.setFilial(cursor.getString(3));
            list.add(p);

        } while (cursor.moveToNext());
    }
    cursor.close()
    return (list);
}

}
Filtro_Activity

中的

像这样编辑你的确定按钮

Button ok = (Button)findViewById(R.id.btnok);
ok.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        //chamada para a nova Activity

        Intent intent = new Intent(Filtro_Activity.this, ListUsersActivity1.class);
        Bundle extras = new Bundle();
        extras.putString("coligada", spcoligada.getSelectedItem().toString());
        intent.putExtras(extras);
        startActivity(intent);
    }
});
ListUserActivity1.class 中 onCreate 内的将此代码放在setContentView（）;

之后 
Bundle extras = getIntent().getExtras();
String coligada = extras.getString("coligada");
List<Produtos> list = BD.newInstance(getApplicationContext(), coligada).buscar2();

希望这对你有帮助。

答案 1 :(得分：0)

就在您的BD类上，您必须从第一个Activity传递的意图中获得值

主要的是你将意图中的价值传递给其他活动非BD，因此你无法在该活动中获得它

在fitro_activity中替换此行

Intent intent=new Intent(this,BD.class);intent.putExtra("coligada","Your Spinner selected Value");startActivity(intent);

在你的BD Class On Create中写这个

Intent i = getIntent(); String spn1 = i.getString("coligada");

您在fit_Activity的putextra中设置的任何值，使用＆＃34; coligada＆＃34;你在sp1 string中得到它。你可以使用toast或Log

上的print来检查它

答案 2 :(得分：0)

我假设你真的想在DB中的Filtro_Activity中使用微调器的值。看起来你几乎就在那里。

这一行：

//chamada para a nova Activity
Intent intent = new Intent(Filtro_Activity.this, ListUsersActivity1.class);

应该是：

//chamada para a nova Activity
Intent intent = new Intent(Filtro_Activity.this, DB.class);

使用要将数据发送到的数据库活动。请注意，它可能不应该是一个活动，而是一个从Filtro_Activity实例化的简单类。

＆＃34;活动是用户可以做的一件重点事。几乎所有活动都与用户互动......＆＃34;与DB的后台连接并不合适，而且活动通常具有我在DB中看不到的GUI。

这个答案确实偏离了原始问题，所以如果你真的想发送微调器数据，你可以在第二个活动onCreate方法中运行以下代码。

Intent intent = getIntent();
String coligada = intent.getStringExtra("coligada");

这些来自http://developer.android.com/training/basics/firstapp/starting-activity.html

的安卓教程

顺便说一句，你应该使用style guides for Java。

答案 3 :(得分：0)

要将信息传输到另一个活动，请使用用于启动新活动的intent。以下是示例链接http://www.hackpundit.com/android-transfer-data-activity-intent/

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