Question

我有一个带自定义适配器的ListView。它显示左侧的图像和两行文字。

mylist.xml

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

<ImageView
    android:id="@+id/icon"
    android:layout_width="60dp"
    android:layout_height="60dp"
    android:padding="5dp" />

<LinearLayout android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <LinearLayout android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id="@+id/item"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Medium Text"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="5dp"
            android:padding="2dp"
            android:textColor="#33CC33" />

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="TextView"
            android:layout_marginLeft="10dp"/>

     </LinearLayout>

    <View
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <Switch
        android:id="@+id/switch1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="21dp"
        android:layout_marginBottom="21dp" />

</LinearLayout>

我想设置动态文本来编辑id“textView1”的文本，但是这个textview将显示在listview的每一行上，我只想更改第二行的文本。

我在MainActivity.java中使用了这段代码

package com.chinmay.callblocker;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.media.AudioManager;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Switch;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends ListActivity {

private TextView extraTxt;

...

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

    CustomListAdapter adapter = new CustomListAdapter(this, itemname, imgid, textDescription);
    setListAdapter(adapter);

    View inflatedView = getLayoutInflater().inflate(R.layout.mylist, null);
    extraTxt = (TextView) inflatedView.findViewById(R.id.textView1);

    final AlertDialog.Builder alert = new AlertDialog.Builder(this);

    SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(this);
    final SharedPreferences.Editor e = settings.edit();
    e.putBoolean("switch", false);
    e.commit();

    getListView().setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
            /*String selected_item = "List View";
            Toast.makeText(getBaseContext(), selected_item, Toast.LENGTH_SHORT).show();*/
            if(position == 1) {


                alert.setTitle("Message");
                alert.setMessage("This message will be sent when call blocking is on");

                // Set an EditText view to get user input
                final EditText input = new EditText(getBaseContext());
                alert.setView(input);

                alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        String value = input.getText().toString();
                        extraTxt.setText(value);
                        //Toast.makeText(getBaseContext(), value, Toast.LENGTH_LONG).show();
                        // Do something with value!
                    }
                });

                alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        // Canceled.
                    }
                });

                alert.show();
            }
        }
    });
}

public void onListItemClick(ListView lv ,View view,int position,int imgid) {
    /*String selected_item = "List View";
    Toast.makeText(this, selected_item, Toast.LENGTH_SHORT).show();*/
}


@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) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}
}

CustomListAdapter.java

package com.chinmay.callblocker;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.media.AudioManager;
import android.preference.PreferenceManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CompoundButton;
import android.widget.ImageView;
import android.widget.Switch;
import android.widget.TextView;
import android.widget.Toast;

/**
 * Created by user on 11/4/2014.
 */

public class CustomListAdapter extends ArrayAdapter<String> {

private final Activity context;
private final String[] itemname;
private final Integer[] imgid;
private final String[] textDescription;
AudioManager mAudio;


public CustomListAdapter(Activity context, String[] itemname, Integer[] imgid, String[] textDescription) {
    super(context, R.layout.mylist, itemname);
// TODO Auto-generated constructor stub
    this.context=context;
    this.itemname=itemname;
    this.imgid=imgid;
    this.textDescription = textDescription;


}
public View getView(int position,View view,ViewGroup parent) {
    LayoutInflater inflater=context.getLayoutInflater();
    View rowView=inflater.inflate(R.layout.mylist, null,true);
    TextView txtTitle = (TextView) rowView.findViewById(R.id.item);
    final Switch mSwitch = (Switch) rowView.findViewById(R.id.switch1);
    ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
    TextView extra_txt = (TextView) rowView.findViewById(R.id.textView1);
    txtTitle.setText(itemname[position]);
    imageView.setImageResource(imgid[position]);
    extra_txt.setText(textDescription[position]);

    mAudio = (AudioManager) getContext().getSystemService(Context.AUDIO_SERVICE);

    if(position == 0) {

        imageView.setVisibility(View.GONE);

        SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(context);
        final SharedPreferences.Editor e = settings.edit();

        mSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){

            @Override
            public void onCheckedChanged(CompoundButton arg0, boolean isChecked) {
                if(isChecked) {
                    mAudio.setRingerMode(AudioManager.RINGER_MODE_SILENT);
                    e.putBoolean("switch", mSwitch.isChecked());
                    e.commit();
                } else {
                    mAudio.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
                    e.putBoolean("switch", mSwitch.isChecked());
                    e.commit();
                }
            }

        });

    } else if(position != 0) {
        mSwitch.setVisibility(View.GONE);

        if(position == 1) {

        }
    }

    return rowView;
};
}

现在这段代码不起作用，因为显然无法获取第2行的文本视图然后更改它。但我认为必须有一些方法来处理ListView上的这些问题。

Answer 1

您需要在CustomListAdapter上调用notifyDataSetChanged（）

如何设置文本到ListView的editText？

1 个答案: