I can not pass info from one ListView to another Activity (ANDROID)

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I can not pass info from one ListView to another Activity (ANDROID)

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After a long time trying to solve the problem I'm not left other than resorting to this means where I hope someone can help me with this problem. what happens is that I try to send information from a row of a ListView to a new activity where there are TextViews where I can modify the information that remains there, but I can not get the info to pass from the Activity list to the Activity Modify. when I touch a row the screen goes blank and returns to the Main Activity

LISTING

package com.example.adminclases.appsensor;

import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.ArrayList;

public class Listado extends AppCompatActivity {

ListView listView;
ArrayList<String> listado;



protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_listado);
    listView = (ListView) findViewById(R.id.listaView);
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

            int id = Integer.parseInt(listado.get(i).split(" ")[0]);
            String nombre=listado.get(i).split(" ")[1];
            String usuario=listado.get(i).split(" ")[2];
            String password=listado.get(i).split(" ")[3];
            String correo=listado.get(i).split(" ")[4];
            Intent intent=new Intent(Listado.this,Modificar.class);
            intent.putExtra("ID",id);
            intent.putExtra("NOMBRE",nombre);
            intent.putExtra("USUARIO",usuario);
            intent.putExtra("PASSWORD",password);
            intent.putExtra("CORREO",correo);
            startActivity(intent);
        }
    });
}

@Override
protected void onPostResume () {
    super.onPostResume();
    cargarlistado();
}

private void cargarlistado() {
    listado = ListaPersonas();
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, listado);
    listView.setAdapter(adapter);
}

private ArrayList<String> ListaPersonas() {
    ArrayList<String> datos = new ArrayList<String>();
    BaseHelper helper = new BaseHelper(this, "DEMO", null, 1);
    SQLiteDatabase db = helper.getWritableDatabase();
    String sql = "Select * from PERSONAS";
    Cursor c = db.rawQuery(sql, null);
    if (c.moveToFirst()) {
        do {
            String linea = " " + c.getInt(0) + " " + c.getString(1) + " " + c.getString(2) + " " + c.getString(3) + " " + c.getString(4);
            datos.add(linea);
        } while (c.moveToNext());
    }
    db.close();
    return datos;
}

}

MODIFY

package com.example.adminclases.appsensor;

import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class Modificar extends AppCompatActivity {

EditText ed_nombre,ed_usuario, ed_password, ed_correo;
Button btn_modificar,btn_eliminar;
int id_recibe;
String nombre_recibe,usuario_recibe, password_recibe, correo_recibe;


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

ed_nombre=(EditText) findViewById(R.id.ed_nombre);
ed_usuario=(EditText) findViewById(R.id.ed_usuario);
ed_password=(EditText) findViewById(R.id.ed_password);
ed_correo=(EditText) findViewById(R.id.ed_correo);
btn_modificar=(Button) findViewById(R.id.btn_modificar);
btn_eliminar=(Button) findViewById(R.id.btn_eliminar);

Bundle b=getIntent().getExtras();

if(b!=null)
{
    id_recibe=b.getInt("ID");
    nombre_recibe=b.getString("NOMBRE");
    usuario_recibe=b.getString("USUARIO");
    password_recibe=b.getString("PASSWORD");
    correo_recibe=b.getString("CORREO");
}
ed_nombre.setText(nombre_recibe);
ed_usuario.setText(usuario_recibe);
ed_password.setText(password_recibe);
ed_correo.setText(correo_recibe);


btn_modificar.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        modificar(id_recibe,ed_nombre.getText().toString(),ed_usuario.getText().toString(),ed_password.getText().toString(),ed_correo.getText().toString());
        onBackPressed();
    }
});

btn_eliminar.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        eliminar(id_recibe);
        onBackPressed();
    }
});
}

private void modificar(int id, String nombre, String usuario, String password, String correo)
{
    BaseHelper helper=new BaseHelper(this,"DEMO",null,1);
    SQLiteDatabase db=helper.getWritableDatabase();
    String sql="UPDATE PERSONAS SET NOMBRE='"+nombre+"', USUARIO='"+usuario+"', PASSWORD='"+password+"', CORREO='"+correo+"' WHERE ID="+id;
    db.execSQL(sql);
}

private void eliminar(int id)
{
    BaseHelper helper=new BaseHelper(this,"DEMO",null,1);
    SQLiteDatabase db=helper.getWritableDatabase();
    String sql="DELETE FROM PERSONAS WHERE ID="+id;
    db.execSQL(sql);
}
}

ACTIVITY_LISTADO.XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.adminclases.appsensor.Listado"
android:weightSum="1">

<ListView
    android:id="@+id/listaView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

</LinearLayout>

ACTIVITY_MODIFY.XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.adminclases.appsensor.Modificar"
android:weightSum="1">

<TextView
    android:id="@+id/Nombre"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Nombre"
    android:textSize="24sp"
    android:gravity="center"/>

<EditText
    android:id="@+id/ed_nombre"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:background="@drawable/redondeoedittext"
    android:inputType="textPersonName"
    android:layout_weight="0.10" />

<TextView
    android:id="@+id/Usuario"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="2dp"
    android:text="Usuario"
    android:textSize="24sp"
    android:gravity="center"/>

<EditText
    android:id="@+id/ed_usuario"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:background="@drawable/redondeoedittext"
    android:inputType="textPersonName"
    android:layout_weight="0.10" />

<TextView
    android:id="@+id/Password"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="2dp"
    android:text="Password"
    android:textSize="24sp"
    android:gravity="center"/>

<EditText
    android:id="@+id/ed_password"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:background="@drawable/redondeoedittext"
    android:inputType="textPersonName"
    android:layout_weight="0.10" />

<TextView
    android:id="@+id/Correo"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Correo"
    android:textSize="24sp"
    android:gravity="center"/>

<EditText
    android:id="@+id/ed_correo"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:background="@drawable/redondeoedittext"
    android:inputType="textPersonName"
    android:layout_weight="0.10" />

<Button
    android:id="@+id/btn_modificar"
    android:layout_width="100dp"
    android:layout_height="50dp"
    android:layout_marginLeft="150dp"
    android:layout_marginTop="40dp"
    android:background="#649dd9"
    android:hint="Modificar" />

<Button
    android:id="@+id/btn_eliminar"
    android:layout_width="100dp"
    android:layout_height="50dp"
    android:layout_marginLeft="150dp"
    android:layout_marginTop="40dp"
    android:background="#649dd9"
    android:hint="Eliminar" />
</LinearLayout>

ANDROID MANIFEST

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.adminclases.appsensor">

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".ActivityIngreso" />
    <activity android:name=".Listado" />
    <activity android:name=".Modificar" />
</application>

LOGCAT

12-05 20:05:23.457 31835-31835/? I/art: Late-enabling -Xcheck:jni
12-05 20:05:23.569 31835-31835/com.example.adminclases.appsensor W/art: 
Before Android 4.1, method android.graphics.PorterDuffColorFilter 


android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter
(android.
graphics.PorterDuffColorFilter, android.content.res.ColorStateList, 
android.graphics.PorterDuff$Mode)
would have incorrectly overridden the package-
private method in android.graphics.drawable.Drawable
12-05 20:05:23.734 31835-31865/com.example.adminclases.appsensor 
D/OpenGLRenderer: Render dirty regions requested: true
12-05 20:05:23.740 31835-31835/com.example.adminclases.appsensor D/Atlas: 
Validating map...
12-05 20:05:23.804 31835-31865/com.example.adminclases.appsensor I/Adreno-
EGL: <qeglDrvAPI_eglInitialize:379>: EGL 1.4 QUALCOMM build: 


 AU_LINUX_ANDROID_LA.BR.1.1.3.C4.05.00.02.094.015_msm8916_64_refs/tags/
 AU_LINUX_
 ANDROID_LA.BR.1.1.3.C4.05.00.02.094.015__release_AU (I68fa98814b)

OpenGL ES Shader Compiler Version: E031.25.03.02

Build Date: 07/16/15 Thu

Local Branch: 

Remote Branch: refs/tags/AU_LINUX_ANDROID_LA.BR.1.1.3.C4.05.00.02.094.015

Local Patches: NONE

Reconstruct Branch: NOTHING
12-05 20:05:23.804 31835-31865/com.example.adminclases.appsensor 
I/OpenGLRenderer: Initialized EGL, version 1.4
12-05 20:05:23.817 31835-31865/com.example.adminclases.appsensor 
D/OpenGLRenderer: Enabling debug mode 0
12-05 20:05:23.950 31835-31835/com.example.adminclases.appsensor I/Timeline: 
Timeline: Activity_idle id: android.os.BinderProxy@3338690f time:843740706

android android-studio listview android-listview

asked by xander 05.12.2017 в 23:49

source

2 answers

Why can not I see a JSON query using the Volley library (Web Services)? Filter data from a gridview according to a second table

score 0 · Answer 1

the error sounds to me that your activity modify is not being created correctly, you may be doing some null reference, in your activity Modify, try changing these lines of code

 if(b!=null)
     { id_recibe=b.getInt("ID"); 
       nombre_recibe=b.getString("NOMBRE"); 
       usuario_recibe=b.getString("USUARIO"); 
       password_recibe=b.getString("PASSWORD"); 
       correo_recibe=b.getString("CORREO"); 
      } 
ed_nombre.setText(nombre_recibe); 
ed_usuario.setText(usuario_recibe); 
ed_password.setText(password_recibe); 
ed_correo.setText(correo_recibe);

for these:

 if(b!=null)
     { id_recibe=b.getInt("ID"); 
       nombre_recibe=b.getString("NOMBRE"); 
       usuario_recibe=b.getString("USUARIO"); 
       password_recibe=b.getString("PASSWORD"); 
       correo_recibe=b.getString("CORREO"); 

       ed_nombre.setText(nombre_recibe); 
       ed_usuario.setText(usuario_recibe); 
       ed_password.setText(password_recibe); 
       ed_correo.setText(correo_recibe);
      }

It is possible that some of the values you are sending through the Intent is null, so it never initializes any of these variables, so when you put it in an edittext, it is null and your activity crashes.

score 0 · Answer 2

First you must call the method load list from onCreate() and do not use onPostResume() :

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_listado);
    listView = (ListView) findViewById(R.id.listaView);
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

            int id = Integer.parseInt(listado.get(i).split(" ")[0]);
            String nombre=listado.get(i).split(" ")[1];
            String usuario=listado.get(i).split(" ")[2];
            String password=listado.get(i).split(" ")[3];
            String correo=listado.get(i).split(" ")[4];
            Intent intent=new Intent(Listado.this,Modificar.class);
            intent.putExtra("ID",id);
            intent.putExtra("NOMBRE",nombre);
            intent.putExtra("USUARIO",usuario);
            intent.putExtra("PASSWORD",password);
            intent.putExtra("CORREO",correo);
            startActivity(intent);
        }
    });

     cargarlistado();
}

/*@Override
protected void onPostResume () {
    super.onPostResume();
    cargarlistado();
}*/