因此,無論何時點擊啓動頁面上的按鈕,它都會給我一個強制關閉錯誤。這裏是main.xml佈局文件的類:按下按鈕時強制關閉應用程序錯誤
public class ForeverAloneActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btnstrt = (Button) findViewById(R.id.toq1);
btnstrt.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
// TODO Auto-generated method stub
Intent frstq = new Intent(v.getContext(), QuestionOne.class);
startActivityForResult(frstq, 0);
而這正是我認爲會產生錯誤的原因。這個類是有關頁面,在按下啓動頁面上的按鈕時,你會被帶到:
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView (R.layout.frstq);
Button startQ2 = (Button) findViewById(R.id.toq2);
startQ2.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
// TODO Auto-generated method stub
Intent toQ2 = new Intent(v.getContext(), QuestionTwo.class);
final EditText number = (EditText) findViewById(R.id.editText1);
final Toast error = Toast.makeText(QuestionOne.this, "Please insert a value", Toast.LENGTH_SHORT);
if (number.getText().toString().equals("")) {error.show();
}else{
startActivityForResult(toQ2, 0);}
這if語句是那裏的下一個頁面上,有一個EditText框。我試圖這樣做,如果EditText框中沒有任何內容,它會顯示一條「請插入一個值」的Toast消息。在將整數放入EditText框之前,該按鈕將不起作用。
如果有人可以幫忙,這將是非常感激。
的logcat:
04-07 19:33:58.199: W/dalvikvm(362): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
04-07 19:33:58.221: E/AndroidRuntime(362): FATAL EXCEPTION: main
04-07 19:33:58.221: E/AndroidRuntime(362): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.kenning.foreveralone/com.kenning.foreveralone.QuestionOne}; have you declared this activity in your AndroidManifest.xml?
04-07 19:33:58.221: E/AndroidRuntime(362): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1404)
04-07 19:33:58.221: E/AndroidRuntime(362): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1378)
04-07 19:33:58.221: E/AndroidRuntime(362): at android.app.Activity.startActivityForResult(Activity.java:2817)
04-07 19:33:58.221: E/AndroidRuntime(362): at com.kenning.foreveralone.ForeverAloneActivity$1.onClick(ForeverAloneActivity.java:22)
04-07 19:33:58.221: E/AndroidRuntime(362): at android.view.View.performClick(View.java:2408)
04-07 19:33:58.221: E/AndroidRuntime(362): at android.view.View$PerformClick.run(View.java:8816)
04-07 19:33:58.221: E/AndroidRuntime(362): at android.os.Handler.handleCallback(Handler.java:587)
04-07 19:33:58.221: E/AndroidRuntime(362): at android.os.Handler.dispatchMessage(Handler.java:92)
04-07 19:33:58.221: E/AndroidRuntime(362): at android.os.Looper.loop(Looper.java:123)
04-07 19:33:58.221: E/AndroidRuntime(362): at android.app.ActivityThread.main(ActivityThread.java:4627)
04-07 19:33:58.221: E/AndroidRuntime(362): at java.lang.reflect.Method.invokeNative(Native Method)
04-07 19:33:58.221: E/AndroidRuntime(362): at java.lang.reflect.Method.invoke(Method.java:521)
04-07 19:33:58.221: E/AndroidRuntime(362): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-07 19:33:58.221: E/AndroidRuntime(362): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-07 19:33:58.221: E/AndroidRuntime(362): at dalvik.system.NativeStart.main(Native Method)
什麼是error.show(); – 2012-04-07 18:32:59
如果EditText字段中沒有值,則顯示Toast的名稱。 – MiKenning 2012-04-07 18:35:59
在清單文件中添加QuestionOne活動 – 2012-04-07 18:38:49