有人可以解释一下，我怎样才能在循环中获得每个ImageView。当我点击BACK按钮时，我想将状态保存到文件中吗？
也许其他解决方案？ THX！
activity_view_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/icon"
android:layout_width="48px"
android:layout_height="48px"
android:layout_marginLeft="4px"
android:layout_marginRight="10px"
android:layout_marginTop="8px"
android:src="@drawable/ic_launcher" >
</ImageView>
<TextView
android:id="@+id/label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@+id/label"
android:textSize="46px" >
</TextView>
</LinearLayout>
ViewList.java
package com.shvedchenko.skleroshop;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.view.KeyEvent;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;
public class ViewList extends ListActivity {
private EditText etInput;
private Button btnAdd;
private ListView lvItem;
private ArrayList<String> itemArrey;
private ArrayAdapter<String> itemAdapter;
private String emptyList = "The SkleroList is empty";
private String listName;
private int ln;
final String DIR_SD = "SkleroShop";
private MyArrayAdapter madapter;
private String fileList[];
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_view_list);
lvItem = (ListView)this.findViewById(R.id.listView_items);
Intent intent = getIntent();
String list = intent.getStringExtra("main");
listName = list;
viewList(list);
}
public int count(String filename) throws IOException {
int lines = 0;
try {
BufferedReader reader = new BufferedReader(new FileReader(filename));
while (reader.readLine() != null) lines++;
reader.close();
} catch (IOException ex) {
Toast.makeText(this,"No File",Toast.LENGTH_SHORT).show();
}
return lines;
}
private void viewList(String list){
//String fileName = "data/data/com.shvedchenko.skleroshop/files/"+list;
if (!Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
Toast.makeText(this,"SD-карта не доступна: " + Environment.getExternalStorageState(),Toast.LENGTH_LONG).show();
return;
}
// получаем путь к SD
File sdPath = Environment.getExternalStorageDirectory();
// добавляем свой каталог к пути
sdPath = new File(sdPath.getAbsolutePath() + "/" + DIR_SD);
File sdFile = new File(sdPath, list);
try {
ln = count(sdFile.toString());
}
catch (IOException ex) {
Toast.makeText(this,"No File",Toast.LENGTH_SHORT).show();
}
fileList = new String[ln];
try {
if (!sdPath.exists()) {
sdPath.mkdirs();
} else {
FileInputStream fis = new FileInputStream(sdFile);
Scanner scanner = new Scanner(fis);
int counter = 0;
while(scanner.hasNextLine()){
fileList[counter] = scanner.nextLine();
counter++;
}
}
setListAdapter(new MyArrayAdapter(this, fileList));
}
catch (java.io.FileNotFoundException e) {
Toast.makeText(this,"Wrong SkleroShop ListName",Toast.LENGTH_SHORT).show();
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
//int count = getListAdapter().getCount();
madapter = new MyArrayAdapter(this,fileList);
int count = madapter.getCount();
madapter.getItem(0);
/*for(int i = 0; i < count; i++) {
Object v = getListAdapter().getItem(i);
Toast.makeText(this,v.toString(),Toast.LENGTH_SHORT).show();
}*/
/*startActivity(intent);
ViewList.this.finish();
return false;*/
}
return super.onKeyDown(keyCode, event);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.list, menu);
return true;
}
}
MyArrayAdapter.java
package com.shvedchenko.skleroshop;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MyArrayAdapter extends ArrayAdapter<String> {
private final Activity context;
private final String[] names;
public MyArrayAdapter(Activity context, String[] names) {
super(context, R.layout.activity_view_list, names);
this.context = context;
this.names = names;
}
// Класс для сохранения во внешний класс и для ограничения доступа
// из потомков класса
static class ViewHolder {
public ImageView imageView;
public TextView textView;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// ViewHolder буферизирует оценку различных полей шаблона элемента
ViewHolder holder;
// Очищает сущетсвующий шаблон, если параметр задан
// Работает только если базовый шаблон для всех классов один и тот же
View rowView = convertView;
if (rowView == null) {
LayoutInflater inflater = context.getLayoutInflater();
rowView = inflater.inflate(R.layout.activity_view_list, null, true);
holder = new ViewHolder();
holder.textView = (TextView) rowView.findViewById(R.id.label);
holder.imageView = (ImageView) rowView.findViewById(R.id.icon);
rowView.setTag(holder);
} else {
holder = (ViewHolder) rowView.getTag();
}
final OnClickListener makeListener = new OnClickListener() {
@Override
public void onClick(View v) {
LinearLayout ll = (LinearLayout)v.getParent();
ImageView iv = (ImageView)ll.getChildAt(0);
assert(R.id.icon == iv.getId());
Integer integer = (Integer) iv.getTag();
integer = integer == null ? 0 : integer;
switch(integer) {
case R.drawable.yes:
iv.setImageResource(R.drawable.no);
iv.setTag(R.drawable.no);
break;
case R.drawable.no:
default:
iv.setImageResource(R.drawable.yes);
iv.setTag(R.drawable.yes);
break;
}
}
};
//holder.textView.setOnClickListener(makeListener);
holder.imageView.setOnClickListener(makeListener);
holder.textView.setText(names[position]);
// Изменение иконки для Windows и iPhone
String s = names[position];
/*if (s.startsWith("Windows7") || s.startsWith("iPhone")
|| s.startsWith("Solaris")) {
holder.imageView.setImageResource(R.drawable.no);
} else {
holder.imageView.setImageResource(R.drawable.yes);
}*/
holder.imageView.setImageResource(R.drawable.no);
holder.imageView.setTag(names[position]);
return rowView;
}
}
答案 0 :(得分：0)
创建一个ImageView数组，并在执行iv.setImageResource(R.drawable.yes);时在数组适配器中执行此操作ivarray[x].setImageResource(R.drawable.yes)并设置一个计数器，为列表的每一行增加x。