我尝试了一切，只是获得了一个JAVA：NULL指针EXCEPTION在我尝试将一个布局放入另一个布局的行。
import java.util.ArrayList;
import java.util.Set;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.widget.Spinner;
import android.widget.TableLayout;
import android.widget.TextView;
public class MainActivity extends Activity {
private SharedPreferences sp;
private TableLayout enterstockTableLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayList<ItemData> list= new ArrayList<ItemData>();
list.add(new ItemData("Indian Rupee",R.drawable.india));
list.add(new ItemData("Us Dollar",R.drawable.usa_dollar));
Spinner sp1=(Spinner) findViewById(R.id.spinner1);
SpinnerAdapter adapter=newSpinnerAdapter(this,R.layout.spinnerlayout,R.id.txt,list);
sp1.setAdapter(adapter);
Spinner sp2=(Spinner) findViewById(R.id.spinner2);
sp2.setAdapter(adapter);
sp= getSharedPreferences("CurrList",MODE_PRIVATE);
insertIntoSp(sp);
updateCurrList(sp);
}
public void updateCurrList(SharedPreferences spd)
{
String[] curr=spd.getAll().entrySet().toArray(new String[0]);
for(int i=0;i<curr.length;i++)
{
String yqlquerryFirst="";
String yqlquerrySecond="";
String yqlFinalquery=yqlquerryFirst+curr[i]+yqlquerrySecond;
insertIntoLayout(curr[i],i);
}
}
private void insertIntoLayout(String string, int i)
{
LayoutInflater inflater=(LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View newRow=inflater.inflate(R.layout.currencylistview,null);
TextView newRowTextView=(TextView) newRow.findViewById(R.id.currtextView);
TextView newRowRateView=(TextView) newRow.findViewById(R.id.changetextView);
TextView newRowotherView=(TextView) newRow.findViewById(R.id.valuetextView);
newRowTextView.setText(string);
enterstockTableLayout.addView(newRow,i);
}
public void insertIntoSp(SharedPreferences spd)
{
Editor edt=spd.edit();
edt.putString("Eur/Usd","EURUSD");
edt.putString("Usd/Jpy","USDJPY");
edt.putString("Gbp/Usd","GBPUSD");
edt.putString("Usd/Chf","USDCHF");
edt.putString("Usd/Cad","USDCAD");
edt.putString("Eur/Jpy","EURJPY");
edt.putString("Aud/Usd","AUDUSD");
edt.commit();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
<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:background="#126180"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TableRow
android:id="@+id/tableRowhead"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >
<TextView
android:id="@+id/curenheadtextview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/CurrencyCon"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#ffffff" />
</TableRow>
<ScrollView
android:id="@+id/scrollView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/tableRowhead"
android:layout_below="@+id/tableRowhead"
android:background="@drawable/splash" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="700dp"
android:layout_marginTop="14dp"
android:background="@android:color/transparent" >
<TableRow
android:id="@+id/tableRow1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="29dp" >
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="7"
android:inputType="numberDecimal"
android:textColor="#ffffff" />
<Spinner
android:id="@+id/spinner1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#ffffff"
android:entries="@array/countrylist1" />
</TableRow>
<TableRow
android:id="@+id/tableRow2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/tableRow1"
android:layout_marginTop="38dp" >
<EditText
android:id="@+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="7"
android:inputType="numberDecimal"
android:textColor="#ffffff" />
<Spinner
android:id="@+id/spinner2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#ffffff"
android:entries="@array/countrylist1" />
</TableRow>
<TableRow
android:id="@+id/tableRow3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/tableRow2"
android:layout_marginTop="11dp"
android:background="#126180" >
<TextView
android:id="@+id/currtextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
android:text="@string/currennciesLabel"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#ffffff" />
</TableRow>
<TableLayout
android:id="@+id/enterstockTableLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/tableRow3"
android:padding="5dp"
android:stretchColumns="yes" >
</TableLayout>
</RelativeLayout>
</ScrollView>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/currencylistviewLayout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/currtextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/valuetextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp" />
<TextView
android:id="@+id/changetextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#d3d3d3"
android:padding="5dp" />
</TableRow>
<TextView
android:id="@+id/desctextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</TableLayout>
我希望动态地将值插入currencylistview.xml，并将此表格布局在currencylistview.xml中插入activity_main.xml。
答案 0 :(得分：1)
您的变量entertockTableLayout未初始化。在setContentView：
之后，您应该在onCreate中执行以下操作enterstockTableLayout = (TableLayout)findViewById(R.id.enterstockTableLayout);