Question

我正在开发我的第一个应用程序，它基本上是一个包含注册系统的简单应用程序，能够在“feed”，“wall”页面上发布文本消息我成功完成了注册系统，现在我只需要知道如何将文本写在“post something”框中并将其放在feed页面上，这样每个人都可以看到它。这是代码：

我刚刚在listview中添加了一个文本，但应用程序在打开之前就崩溃了

主：

package com.example.ali.bla;

import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.Arrays;


public class MainActivity extends ActionBarActivity {

    private ListView mainListView ;
    private ArrayAdapter<String> listAdapter ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // Find the ListView resource.
        mainListView = (ListView) findViewById( R.id.mainListView );

        // Create and populate a List of planet names.
        String[] planets = new String[] { "Mercury", "Venus", "Earth", "Mars",
                "Jupiter", "Saturn", "Uranus", "Neptune"};
        ArrayList<String> planetList = new ArrayList<String>();
        planetList.addAll( Arrays.asList(planets) );

        // Create ArrayAdapter using the planet list.
        listAdapter = new ArrayAdapter<String>(this, R.layout.simplerow, planetList);
        // Set the ArrayAdapter as the ListView's adapter.
        mainListView.setAdapter( listAdapter );
    }

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

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            new Intent(MainActivity.this, post.class);
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

这是post class，我想提取由usrs编写的文本并将其添加到listview中：

package com.example.ali.bla;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;


public class post extends ActionBarActivity {

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

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

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

这些是xml文件：

主：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <ListView android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/mainListView">
    </ListView>


</RelativeLayout>

行：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent">

    <TextView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/rowTextView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:textSize="16sp" >
    </TextView>
</LinearLayout>

和帖子：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="com.example.ali.bla.post">


   <EditText
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:id="@+id/post"
       android:hint="share with us !"/>

</RelativeLayout>

谢谢

在listview android教程中发布文本消息

0 个答案: