我需要帮助找出这段代码有什么问题，我已经搜索了如何实现 ListView OnItemClickListeners，但我无法让它们工作。
如果没有设置 OnItemClickListeners 的方法，应用程序运行良好，当我设置它们时，应用程序崩溃。
此活动的目的是加载与微调器对应的客户端列表（微调器包含不同的城市），然后每当单击项目时，启动不同的活动。
public class MainActivity extends Activity {
private Spinner spinner2;
private Button sync;
private static String selectedOption = "";
private ListView listview;
private static ArrayList<String> values;
private static Client[] clientArray;
final Context context = this;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sync = (Button) findViewById(R.id.bSync);
//Client list
clientArray = new Client[5];
//Populate the client list
clientArray[0] = new Client("Roberto Herrero", "Resistencia", "Calle Falsa 123", 10.0f);
clientArray[1] = new Client("Carlos Stigeslts", "Resistencia", "Calle Falsa 123", 10.0f);
clientArray[2] = new Client("Pedro Zaragoza", "Resistencia", "Calle Falsa 123", 10.0f);
clientArray[3] = new Client("Pablo Pedroso", "Charata", "Calle Falsa 123", 10.0f);
clientArray[4] = new Client("Juan Jose Falalalala", "Resistencia", "Calle Falsa 123", 10.0f);
spinner2 = (Spinner) findViewById(R.id.spinner2);
List<String> list = new ArrayList<String>();
int count = 0;
if(clientArray != null && clientArray.length != 0) {
String local = clientArray[0].getLocality();
list.add(local);
for(int i = 0; i < clientArray.length; i++) {
if(!local.equals(clientArray[i].getLocality())) {
if(!list.contains(clientArray[i].getLocality())) {
list.add(clientArray[i].getLocality());
}
}
}
}
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, list);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner2.setAdapter(dataAdapter);
addSpinnerListener();
addButtonListeners();
//THIS IS CAUSING THE APP TO CRASH, WITHOUT THIS METHOD CALL, THE APPS RUNS FINE
setListviewListeners();
}
public void setListviewListeners() {
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Intent intent = new Intent("android.intent.action.CLIENTVIEW");
startActivity(intent);
}
});
}
public void addSpinnerListener() {
spinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long l) {
String selected= parent.getItemAtPosition(position).toString();
selectedOption = selected;
//List Values
values = new ArrayList<String>();
for(int i = 0; i < clientArray.length; i++) {
if(clientArray[i].getLocality().equalsIgnoreCase(selectedOption)) {
values.add(clientArray[i].getName() + "\n" + clientArray[i].getAddress());
}
}
//Declare, Define and find the ListView
listview = (ListView) findViewById(R.id.listview);
ArrayList<String> vlist = new ArrayList<String>();
for (int i = 0; i < values.size(); ++i) {
vlist.add(values.get(i));
}
ArrayAdapter adapter = new ArrayAdapter(context,
android.R.layout.simple_list_item_1, vlist);
listview.setAdapter(adapter);
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
}
public void addButtonListeners() {
sync.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);
// set title
alertDialogBuilder.setTitle("REPORT");
// set dialog message
alertDialogBuilder.setMessage("NOT IMPLEMENTED");
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
}
});
}
}
这是xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/bSync"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="SINCRONIZAR" />
<Spinner
android:id="@+id/spinner2"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/listview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
这是清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.sistel.listview"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="8" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.sistel.listview.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.sistel.listview.ClientView"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.CLIENTVIEW" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
这是我想开始的活动
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TableLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/tableLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:baselineAligned="false"
android:weightSum="100">
<TableRow
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dip">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="80"
android:text="Nombre"
android:id="@+id/textView"
android:layout_column="0"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="15"
android:text="Saldo"
android:id="@+id/textView2"
android:layout_column="1"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="5"
android:text="Cascos"
android:id="@+id/textView3"
android:layout_column="2"/>
</TableRow>
<TableRow
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dip">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="80"
android:text="Saldo Anterior"
android:id="@+id/textView"
android:layout_column="0"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="15"
android:text="SaldoA"
android:id="@+id/textView2"
android:layout_column="1"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="5"
android:text="CascosA"
android:id="@+id/textView3"
android:layout_column="2"/>
</TableRow>
<TableRow
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dip">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="80"
android:text="Retiros"
android:id="@+id/textView"
android:layout_column="0"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="15"
android:text="SaldoA"
android:id="@+id/textView2"
android:layout_column="1"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="5"
android:inputType="number"
android:ems="2"
android:id="@+id/editText"/>
</TableRow>
<TableRow
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dip">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="80"
android:text="Entrega"
android:id="@+id/textView"
android:layout_column="0"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="15"
android:text="Entrega"
android:id="@+id/textView2"
android:layout_column="1"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="5"
android:inputType="number"
android:ems="2"
android:id="@+id/editText"/>
</TableRow>
<TableRow
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dip">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="80"
android:text="Pagos"
android:id="@+id/textView"
android:layout_column="0"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="15"
android:inputType="number"
android:ems="2"
android:id="@+id/editText"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="5"
android:text=""
android:id="@+id/textView2"
android:layout_column="1"/>
</TableRow>
<TableRow
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dip">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="80"
android:text="Pagos"
android:id="@+id/textView"
android:layout_column="0"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="15"
android:text="SaldoAc"
android:id="@+id/textView2"
android:layout_column="1"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="5"
android:text="CascosAc"
android:id="@+id/textView2"
android:layout_column="1"/>
</TableRow>
这是我要开始的活动的 JAVA
public class ClientView extends Activity {
private Button update;
private Context context = this;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.client);
initComponets();
buttonListener();
}
public void initComponets() {
update = (Button) findViewById(R.id.bUpdate);
}
public void buttonListener() {
update.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View view) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);
// set title
alertDialogBuilder.setTitle("REPORT");
// set dialog message
alertDialogBuilder.setMessage("DUMMY PROCEDURE");
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
}
});
}
}