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[英]How can i open new activity clicking an item in listview in Android Studio?
[英]How open new activity clicking an item in listview?
我無法啟動新活動,點擊列表視圖中的項目。 我希望onItemClick
可以打開ApkInfoActivity
。實際上當我點擊什么都沒發生。
protected void onItemClick(ListView l, View v, int position, long id, AdapterView<?> parent) {
super.onListItemClick(l, v, position, id);
final ApplicationInfo app = applist.get(position);
PackageInfo packageInfo = (PackageInfo) parent.getItemAtPosition(position);
AppDataActivity appData = (AppDataActivity) getApplicationContext();
appData.setPackageInfo(packageInfo);
Intent appInfo = new Intent(getApplicationContext(), ApkInfoActivity.class);
startActivity(appInfo);
}
我找不到問題。我怎么解決?
用logcat編輯:
10-29 17:14:07.710: E/AndroidRuntime(3535): FATAL EXCEPTION: main
10-29 17:14:07.710: E/AndroidRuntime(3535): java.lang.ClassCastException: android.content.pm.ApplicationInfo cannot be cast to android.content.pm.PackageInfo
10-29 17:14:07.710: E/AndroidRuntime(3535): at com.dd.application.MainActivity.onItemClick(MainActivity.java:369)
10-29 17:14:07.710: E/AndroidRuntime(3535): at android.widget.AdapterView.performItemClick(AdapterView.java:297)
10-29 17:14:07.710: E/AndroidRuntime(3535): at android.widget.AbsListView.performItemClick(AbsListView.java:1149)
10-29 17:14:07.710: E/AndroidRuntime(3535): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2939)
10-29 17:14:07.710: E/AndroidRuntime(3535): at android.widget.AbsListView$2.run(AbsListView.java:3622)
10-29 17:14:07.710: E/AndroidRuntime(3535): at android.os.Handler.handleCallback(Handler.java:730)
10-29 17:14:07.710: E/AndroidRuntime(3535): at android.os.Handler.dispatchMessage(Handler.java:92)
10-29 17:14:07.710: E/AndroidRuntime(3535): at android.os.Looper.loop(Looper.java:137)
10-29 17:14:07.710: E/AndroidRuntime(3535): at android.app.ActivityThread.main(ActivityThread.java:5323)
10-29 17:14:07.710: E/AndroidRuntime(3535): at java.lang.reflect.Method.invokeNative(Native Method)
10-29 17:14:07.710: E/AndroidRuntime(3535): at java.lang.reflect.Method.invoke(Method.java:525)
10-29 17:14:07.710: E/AndroidRuntime(3535): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:743)
10-29 17:14:07.710: E/AndroidRuntime(3535): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:559)
10-29 17:14:07.710: E/AndroidRuntime(3535): at dalvik.system.NativeStart.main(Native Method)
用它來做你的工作
list.setOnItemClickListener(new AdapterView.onItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapter, View view, int position, long arg) {
Intent appInfo = new Intent(YourActivity.this, ApkInfoActivity.class);
startActivity(appInfo);
}
});
public class MenuYangu extends ListActivity {
String classes[] = { "Quiz Trivia", "Sign A New User", "Friend List",
"Download A File", "Upload A File", "Select Pdf files", "Memory Game",
"Dzidza Maths", "Write Exam" };
@Override
protected void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setListAdapter(new ArrayAdapter<String>(Menuone.this,
android.R.layout.simple_list_item_1, classes));
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id)
{
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
if (position == 0) {
Intent intent = new Intent(this, QuizActivity.class);
startActivity(intent);
}
else if (position == 1) {
Intent intent = new Intent(this, SignUp.class);
startActivity(intent);
}
else if (position == 2) {
Intent intent = new Intent(this, FriendList.class);
startActivity(intent);
}
}
}
}
您需要使用Intent,您還可以將單擊的listview項數據傳遞給新活動。
String classes[] = { "Quiz Trivia", "Sign A New User", "Friend List",
"Download A File", "Upload A File", "Select Pdf files", "Memory Game",
"Dzidza Maths", "Write Exam" };
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Intent intent = new Intent(getApplicationContext(),ApkInfoActivity.class);
intent.putExtra("name",classes[i]);
startActivity(intent);
}
});
}
輸出:
你可以在這里找到整個教程
為Listview添加setOnItemclickListener()。
用這個:
Intent appInfo = new Intent(CurrentActivity.this, ApkInfoActivity.class); startActivity(appInfo);
嘗試將方法標題從protected
更改為public
。
編輯
現在我看一下,你的方法標題實際上是錯誤的。 它應該是以下內容:
public abstract void onItemClick (AdapterView<?> parent, View view, int position, long id)
變量必須與它們實現的接口中的變量順序相同。
例如,如果你想打開一個基於文本的活動你點擊列表視圖,即如果“abcd”是點擊列表視圖的選項,你想打開具有相同名稱“abcd”的活動,那么執行此操作。 。
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String temp=yourarray[position];
try{
Class myclass=Class.forName("yourpackagename."+temp);
Intent in=new Intent(this,myclass);
startActivity(in);
}catch(Exception e){
}
}
給我的答案解釋。 我假設您已按照發布的代碼順序設置列表視圖。 我只會檢查你的代碼的這一部分:super.onListItemClick(l,v,position,id); 我不這是必要的。 在我給出的例子的情況下:
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapter, View view, int position, long arg) {
if(position==0){
Intent appInfo = new Intent(SwahiliService.this, DisplayActivity.class);
startActivity(appInfo);
}
if(position==1){
Intent english=new Intent(SwahiliService.this,EnglishService.class);
startActivity(english);
}
if(position==2){
Toast.makeText(getApplicationContext(),"You have selected pst3", Toast.LENGTH_LONG).show();
}
我只是設置一個lister到我的listview,我稱之為lv,我的適配器(這是我的listview項目的持有者)設置了三個變量,一個是View,int是位置,long是參數:我參考選擇的項目listview的位置通常從0開始(盡管你可以將它實例化為任何其他數字,如你所願e,g int position = 1,將項目計數開始為1)。 從這里你可以使用任何控件結構來按照單擊的項目啟動活動,在我的情況下,我使用了for循環,因為我假設我的listview只有三個項目,對於更大的listview項目,你可以使用for循環。 請注意我如何通過首先引用當前活動來開始我的新活動,如下所示(SwahiliService.this)可以安全地替換為(僅此關鍵字),然后遵循我想要開始的活動。 我希望現在更加精細。
//添加ArrayList和ArrayAdapter:
final ArrayList<String> listItems = new ArrayList<String>();
listItems.add("image_one");
listItems.add("image_two");
listItems.add("image_three");
ArrayAdapter<String> myArrayAdapter = new ArrayAdapter<>(this,
android.R.layout.simple_list_item_1, listItems);
myListView.setAdapter(myArrayAdapter);
//添加類的ArrayList :
final ArrayList<Class> intents = new ArrayList<Class>();
intents.add(image_one.class);
intents.add(image_two.class);
intents.add(image_three.class);
//單擊列表項以從類的ArrayList打開Class:
myListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int
position, long id) {
Intent listIntent = new Intent(getApplicationContext(),
intents.get(position));
startActivity(listIntent);
}
});
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapter, View view, int position, long arg) {
if(position==0){
Intent appInfo = new Intent(SwahiliService.this, DisplayActivity.class);
startActivity(appInfo);
}
if(position==1){
Intent english=new Intent(SwahiliService.this,EnglishService.class);
startActivity(english);
}
if(position==2){
Toast.makeText(getApplicationContext(),"You have selected pst3", Toast.LENGTH_LONG).show();
}
}});
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