不能点击的ListView中的项目与自定义适配器 [英] Can't click on items in ListView with custom adapter
问题描述
我试图写一个应用程序,它从数据库中需要的物品并填充一个ListView内的行。轻敲行后,我不能点击的项目和DPAD不会去任何行任。我使用的是自定义的适配器。
Tweet.xml
< XML版本=1.0编码=UTF-8&GT?;
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =FILL_PARENT
机器人:layout_height =机器人:ATTR /列表preferredItemHeight
机器人:填充=6dip
机器人:方向=垂直>
<的LinearLayout
机器人:layout_width =FILL_PARENT
机器人:layout_height =WRAP_CONTENT
机器人:方向=横向>
<的TextView
机器人:ID =@ + ID / textUser
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:TEXTSTYLE =黑体
机器人:文本=NAME/>
<的TextView
机器人:ID =@ + ID / textDate
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:文字颜色=#333333
机器人:文本=DATE/>
< / LinearLayout中>
<的TextView
机器人:ID =@ + ID / textTweet
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:文本=鸣叫/>
< / LinearLayout中>
Activity_main.xml
< XML版本=1.0编码=UTF-8&GT?;
< ListView控件的xmlns:机器人=http://schemas.android.com/apk/res/android
的xmlns:工具=http://schemas.android.com/tools
机器人:ID =@ + ID / ListView控件
机器人:layout_width =match_parent
机器人:layout_height =match_parent
机器人:layout_alignParentLeft =真
机器人:layout_alignParentTop =真
工具:上下文=MainActivity。>
< / ListView控件>
onCreate方法
@覆盖
保护无效的onCreate(包savedInstanceState)
{
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
ListView的视图=(ListView控件)findViewById(R.id.listView);
MyArrayAdapter theAdapter =新MyArrayAdapter(tweetDb,这一点);
//setContentView(theAdapter.getView(0,NULL,NULL));
view.setAdapter(theAdapter);
view.setOnItemClickListener(新OnItemClickListener()
{
@覆盖
公共无效onItemClick(适配器视图<>母公司,视图V,INT位置,
长ID)
{
//分享Tweet theTweet =(鸣叫)parent.getAdapter()的getItem(位置)。
//saved.insert(theTweet);
Toast.makeText(getApplicationContext(),拯救,Toast.LENGTH_LONG).show();
Log.v(纲目,onItemClick被解雇了!);
}
});
}
适配器类getView
@覆盖
公共查看getView(INT位置,查看convertView,父母的ViewGroup)
{
LayoutInflater充气=(LayoutInflater)context.getSystemService(
Context.LAYOUT_INFLATER_SERVICE
);
查看tweetView = inflater.inflate(R.layout.tweet,NULL);
TextView的textTweet =(TextView中)tweetView.findViewById(R.id.textTweet);
textTweet.setText(items.get(位置).getTweet());
textTweet =(TextView中)tweetView.findViewById(R.id.textUser);
textTweet.setText(items.get(位置).getName());
textTweet =(TextView中)tweetView.findViewById(R.id.textDate);
textTweet.setText(textFormat.format(items.get(位置).getCreated()));
返回tweetView;
}
MyArrayAdapter类
进口java.text.SimpleDateFormat的;
进口的java.util.ArrayList;
进口java.util.Date;
进口android.content.Context;
进口android.database.Cursor;
进口android.database.DataSetObserver;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.view.ViewGroup;
进口android.widget.ListAdapter;
进口android.widget.TextView;
进口android.widget.Toast;
公共类MyArrayAdapter实现ListAdapter
{
私人的ArrayList<分享Tweet>项目;
私人上下文的背景下;
私人的SimpleDateFormat的textFormat =新的SimpleDateFormat(E MMM DD HH:MM:SSžYYYY);
公共MyArrayAdapter(TweetDbSource分贝,上下文语境)
{
项目=新的ArrayList<分享Tweet>();
this.context =背景;
光标光标= db.getReadableDatabase()查询(鸣叫,NULL,NULL,NULL,NULL,NULL,NULL);
而(!cursor.isLast())
{
cursor.moveToNext();
items.add(新资料Tweet(cursor.getLong(0),cursor.getLong(1),cursor.getString(2),cursor.getString(3),
cursor.getString(4),新日期(),cursor.getInt(6)));
}
}
@覆盖
公众诠释getCount将()
{
返回items.size();
}
@覆盖
公共对象的getItem(INT位置)
{
返回items.get(位置);
}
@覆盖
众长getItemId(INT位置)
{
返回的位置;
}
@覆盖
公众诠释getItemViewType(INT为arg0)
{
// TODO自动生成方法存根
返回0;
}
@覆盖
公共查看getView(INT位置,查看convertView,父母的ViewGroup)
{
LayoutInflater充气=(LayoutInflater)context.getSystemService(
Context.LAYOUT_INFLATER_SERVICE
);
OnClickListener saveTweet =新OnClickListener()
{
公共无效的onClick(视图v)
{
Toast.makeText(v.getContext(),拯救,Toast.LENGTH_LONG).show();
}
};
查看tweetView = inflater.inflate(R.layout.tweet,NULL);
TextView的textTweet =(TextView中)tweetView.findViewById(R.id.textTweet);
textTweet.setText(items.get(位置).getTweet());
textTweet =(TextView中)tweetView.findViewById(R.id.textUser);
textTweet.setText(items.get(位置).getName());
textTweet =(TextView中)tweetView.findViewById(R.id.textDate);
textTweet.setText(textFormat.format(items.get(位置).getCreated()));
返回tweetView;
}
@覆盖
公众诠释getViewTypeCount()
{
// TODO自动生成方法存根
返回1;
}
@覆盖
公共布尔hasStableIds()
{
// TODO自动生成方法存根
返回false;
}
@覆盖
公共布尔的isEmpty()
{
// TODO自动生成方法存根
返回items.size()== 0;
}
@覆盖
公共无效registerDataSetObserver(DataSetObserver为arg0)
{
// TODO自动生成方法存根
}
@覆盖
公共无效unregisterDataSetObserver(DataSetObserver为arg0)
{
// TODO自动生成方法存根
}
@覆盖
公共布尔areAllItemsEnabled()
{
// TODO自动生成方法存根
返回false;
}
@覆盖
公共布尔的IsEnabled(INT为arg0)
{
// TODO自动生成方法存根
返回false;
}
}
吐司或记录不工作,那就是我可以告诉它不工作
更新getView方法
公开查看getView(INT位置,查看convertView,父母的ViewGroup)
{
OnClickListener SaveView =新OnClickListener(){
@燮pressLint(NewApi)
公共无效的onClick(视图v)
{
Toast.makeText(v.getContext(),拯救,Toast.LENGTH_LONG).show();
v.callOnClick();
}
};
LayoutInflater充气=(LayoutInflater)context.getSystemService(
Context.LAYOUT_INFLATER_SERVICE
);
查看tweetView = inflater.inflate(R.layout.tweet,NULL);
TextView的textTweet =(TextView中)tweetView.findViewById(R.id.textTweet);
textTweet.setText(items.get(位置).getTweet());
textTweet =(TextView中)tweetView.findViewById(R.id.textUser);
textTweet.setText(items.get(位置).getName());
textTweet =(TextView中)tweetView.findViewById(R.id.textDate);
textTweet.setText(textFormat.format(items.get(位置).getCreated()));
tweetView.setOnClickListener(SaveView);
返回tweetView;
}
更新
这个问题解决了,我想通了:DI必须在这两种方法在我的适配器类返回的假真不是
@覆盖
公共布尔areAllItemsEnabled()
{
返回true;
}
@覆盖
公共布尔的IsEnabled(INT为arg0)
{
返回true;
}
这通常是因为你的列表视图中的项目都在关注的焦点。尝试添加
安卓descendantFocusability =blocksDescendants
在自定义列表视图行
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =FILL_PARENT
机器人:layout_height =机器人:ATTR /列表preferredItemHeight
机器人:填充=6dip
机器人:方向=垂直
机器人:descendantFocusability =blocksDescendants>
I am trying to write an application which takes items from a database and populates rows within a ListView. I can't click on the items after tapping on the rows and the dpad won't go to any of the rows either. I am using a custom Adapter.
Tweet.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="?android:attr/listPreferredItemHeight"
android:padding="6dip"
android:orientation="vertical">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/textUser"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textStyle="bold"
android:text="NAME"/>
<TextView
android:id="@+id/textDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#333333"
android:text="DATE" />
</LinearLayout>
<TextView
android:id="@+id/textTweet"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TWEET" />
</LinearLayout>
Activity_main.xml
<?xml version="1.0" encoding="UTF-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
tools:context=".MainActivity" >
</ListView>
Oncreate Method
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView view = (ListView) findViewById(R.id.listView);
MyArrayAdapter theAdapter = new MyArrayAdapter(tweetDb,this);
//setContentView(theAdapter.getView(0, null, null));
view.setAdapter(theAdapter);
view.setOnItemClickListener( new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> parent, View v, int position,
long id)
{
//Tweet theTweet = (Tweet)parent.getAdapter().getItem(position);
//saved.insert(theTweet);
Toast.makeText(getApplicationContext(), "Saved", Toast.LENGTH_LONG).show();
Log.v("SCHEMA", "onItemClick fired!");
}
} );
}
Adapter Class getView
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
LayoutInflater inflater = (LayoutInflater)context.getSystemService(
Context.LAYOUT_INFLATER_SERVICE
);
View tweetView = inflater.inflate(R.layout.tweet, null);
TextView textTweet = (TextView) tweetView.findViewById(R.id.textTweet);
textTweet.setText(items.get(position).getTweet());
textTweet = (TextView)tweetView.findViewById(R.id.textUser);
textTweet.setText(items.get(position).getName());
textTweet = (TextView)tweetView.findViewById(R.id.textDate);
textTweet.setText(textFormat.format(items.get(position).getCreated()));
return tweetView;
}
MyArrayAdapter Class
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import android.content.Context;
import android.database.Cursor;
import android.database.DataSetObserver;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.TextView;
import android.widget.Toast;
public class MyArrayAdapter implements ListAdapter
{
private ArrayList<Tweet> items;
private Context context;
private SimpleDateFormat textFormat = new SimpleDateFormat("E MMM dd HH:mm:ss z yyyy");
public MyArrayAdapter(TweetDbSource db, Context context)
{
items = new ArrayList<Tweet>();
this.context = context;
Cursor cursor = db.getReadableDatabase().query("Tweet", null, null, null, null, null, null);
while (!cursor.isLast())
{
cursor.moveToNext();
items.add(new Tweet(cursor.getLong(0),cursor.getLong(1),cursor.getString(2),cursor.getString(3),
cursor.getString(4),new Date(),cursor.getInt(6)));
}
}
@Override
public int getCount()
{
return items.size();
}
@Override
public Object getItem(int position)
{
return items.get(position);
}
@Override
public long getItemId(int position)
{
return position;
}
@Override
public int getItemViewType(int arg0)
{
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
LayoutInflater inflater = (LayoutInflater)context.getSystemService(
Context.LAYOUT_INFLATER_SERVICE
);
OnClickListener saveTweet = new OnClickListener()
{
public void onClick(View v)
{
Toast.makeText(v.getContext(), "Saved", Toast.LENGTH_LONG).show();
}
};
View tweetView = inflater.inflate(R.layout.tweet, null);
TextView textTweet = (TextView) tweetView.findViewById(R.id.textTweet);
textTweet.setText(items.get(position).getTweet());
textTweet = (TextView)tweetView.findViewById(R.id.textUser);
textTweet.setText(items.get(position).getName());
textTweet = (TextView)tweetView.findViewById(R.id.textDate);
textTweet.setText(textFormat.format(items.get(position).getCreated()));
return tweetView;
}
@Override
public int getViewTypeCount()
{
// TODO Auto-generated method stub
return 1;
}
@Override
public boolean hasStableIds()
{
// TODO Auto-generated method stub
return false;
}
@Override
public boolean isEmpty()
{
// TODO Auto-generated method stub
return items.size() == 0;
}
@Override
public void registerDataSetObserver(DataSetObserver arg0)
{
// TODO Auto-generated method stub
}
@Override
public void unregisterDataSetObserver(DataSetObserver arg0)
{
// TODO Auto-generated method stub
}
@Override
public boolean areAllItemsEnabled()
{
// TODO Auto-generated method stub
return false;
}
@Override
public boolean isEnabled(int arg0)
{
// TODO Auto-generated method stub
return false;
}
}
Toast or log is not working, that's how I can tell it's not working
Updated getView Method
public View getView(int position, View convertView, ViewGroup parent)
{
OnClickListener SaveView = new OnClickListener() {
@SuppressLint("NewApi")
public void onClick(View v)
{
Toast.makeText(v.getContext(), "Saved", Toast.LENGTH_LONG).show();
v.callOnClick();
}
};
LayoutInflater inflater = (LayoutInflater)context.getSystemService(
Context.LAYOUT_INFLATER_SERVICE
);
View tweetView = inflater.inflate(R.layout.tweet, null);
TextView textTweet = (TextView) tweetView.findViewById(R.id.textTweet);
textTweet.setText(items.get(position).getTweet());
textTweet = (TextView)tweetView.findViewById(R.id.textUser);
textTweet.setText(items.get(position).getName());
textTweet = (TextView)tweetView.findViewById(R.id.textDate);
textTweet.setText(textFormat.format(items.get(position).getCreated()));
tweetView.setOnClickListener(SaveView);
return tweetView;
}
UPDATE
The issue was solved and I figured it out :D I had to return true instead of false in these two methods within my adapter class!
@Override
public boolean areAllItemsEnabled()
{
return true;
}
@Override
public boolean isEnabled(int arg0)
{
return true;
}
Usually this happens because the items in your listview are in focus. Try adding
android:descendantFocusability="blocksDescendants"
in your custom listview row
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:padding="6dip"
android:orientation="vertical"
android:descendantFocusability="blocksDescendants">
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