这是我在Androin的第一个应用程序，我不明白错误在哪里！当按下按钮在数据库中插入数据时，应用程序意外停止并且logcat为：
05-13 11:15:12.684: E/AndroidRuntime(15566): FATAL EXCEPTION: main
05-13 11:15:12.684: E/AndroidRuntime(15566): Process: com.n2d.survey, PID: 15566
05-13 11:15:12.684: E/AndroidRuntime(15566): java.lang.IllegalStateException: Could not find a method Adddata(View) in the activity class com.n2d.survey.MainActivity for onClick handler on view class android.widget.Button with id 'button1'
05-13 11:15:12.684: E/AndroidRuntime(15566): at android.view.View$1.onClick(View.java:3852)
05-13 11:15:12.684: E/AndroidRuntime(15566): at android.view.View.performClick(View.java:4480)
05-13 11:15:12.684: E/AndroidRuntime(15566): at android.view.View$PerformClick.run(View.java:18673)
05-13 11:15:12.684: E/AndroidRuntime(15566): at android.os.Handler.handleCallback(Handler.java:733)
05-13 11:15:12.684: E/AndroidRuntime(15566): at android.os.Handler.dispatchMessage(Handler.java:95)
05-13 11:15:12.684: E/AndroidRuntime(15566): at android.os.Looper.loop(Looper.java:157)
05-13 11:15:12.684: E/AndroidRuntime(15566): at android.app.ActivityThread.main(ActivityThread.java:5872)
05-13 11:15:12.684: E/AndroidRuntime(15566): at java.lang.reflect.Method.invokeNative(Native Method)
05-13 11:15:12.684: E/AndroidRuntime(15566): at java.lang.reflect.Method.invoke(Method.java:515)
05-13 11:15:12.684: E/AndroidRuntime(15566): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1069)
05-13 11:15:12.684: E/AndroidRuntime(15566): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:885)
05-13 11:15:12.684: E/AndroidRuntime(15566): at dalvik.system.NativeStart.main(Native Method)
05-13 11:15:12.684: E/AndroidRuntime(15566): Caused by: java.lang.NoSuchMethodException: Adddata [class android.view.View]
05-13 11:15:12.684: E/AndroidRuntime(15566): at java.lang.Class.getConstructorOrMethod(Class.java:472)
05-13 11:15:12.684: E/AndroidRuntime(15566): at java.lang.Class.getMethod(Class.java:857)
05-13 11:15:12.684: E/AndroidRuntime(15566): at android.view.View$1.onClick(View.java:3845)
05-13 11:15:12.684: E/AndroidRuntime(15566): ... 11 more
这是我的活动：
public class MainActivity extends Activity {
String zone,adress,number,families;
TableRow tableRow;
TextView textView,textView1,textView2,textView3,textView4,textView5,textView6,textView7;
SQLiteDatabase db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
db=openOrCreateDatabase("Survey",MODE_PRIVATE, null);
db.execSQL("CREATE TABLE IF NOT EXISTS Rilevamenti(zone VARCHAR,adress VARCHAR,number VARCHAR,families VARCHAR);");
}
public void Adddata(View view) {
//riferimento alla TextEdit
EditText edittext1=(EditText )findViewById(R.id.zone);
EditText edittext2=(EditText )findViewById(R.id.adress);
EditText edittext3=(EditText )findViewById(R.id.number);
EditText edittext4=(EditText )findViewById(R.id.families);
zone=edittext1.getText().toString();
adress=edittext2.getText().toString();
number=edittext3.getText().toString();
families=edittext4.getText().toString();
db.execSQL("INSERT INTO Rilevamenti VALUES('"+zone+"','"+adress+"','"+number+"'+'"+families+"');");
}
public void Showdata(View view)
{
Cursor c=db.rawQuery("SELECT * from Rilevamenti", null);
int count= c.getCount();
c.moveToFirst();
TableLayout tableLayout = new TableLayout(getApplicationContext());
tableLayout.setVerticalScrollBarEnabled(true);
tableRow = new TableRow(getApplicationContext());
textView = new TextView(getApplicationContext());
textView.setText("Zona");
textView.setTextColor(Color.RED);
textView.setTypeface(null, Typeface.BOLD);
textView.setPadding(20, 20, 20, 20);
tableRow.addView(textView);
textView5 = new TextView(getApplicationContext());
textView5.setText("Indirizzo");
textView5.setTextColor(Color.RED);
textView5.setTypeface(null, Typeface.BOLD);
textView5.setPadding(20, 20, 20, 20);
tableRow.addView(textView5);
textView6 = new TextView(getApplicationContext());
textView6.setText("Numero civico");
textView6.setTextColor(Color.RED);
textView6.setTypeface(null, Typeface.BOLD);
textView6.setPadding(20, 20, 20, 20);
tableRow.addView(textView6);
textView7 = new TextView(getApplicationContext());
textView7.setText("Numero di famiglie");
textView7.setTextColor(Color.RED);
textView7.setTypeface(null, Typeface.BOLD);
textView7.setPadding(20, 20, 20, 20);
tableRow.addView(textView7);
tableLayout.addView(tableRow);
for (Integer j = 0; j < count; j++)
{
tableRow = new TableRow(getApplicationContext());
textView1 = new TextView(getApplicationContext());
textView1.setText(c.getString(c.getColumnIndex("zone")));
textView2 = new TextView(getApplicationContext());
textView2.setText(c.getString(c.getColumnIndex("adress")));
textView3 = new TextView(getApplicationContext());
textView3.setText(c.getString(c.getColumnIndex("number")));
textView4 = new TextView(getApplicationContext());
textView4.setText(c.getString(c.getColumnIndex("families")));
textView1.setPadding(20,20,20,20);
textView2.setPadding(20,20,20,20);
textView3.setPadding(20,20,20,20);
textView4.setPadding(20,20,20,20);
tableRow.addView(textView1);
tableRow.addView(textView2);
tableRow.addView(textView3);
tableRow.addView(textView4);
tableLayout.addView(tableRow);
c.moveToNext();
}
setContentView(tableLayout);
db.close();
}
//funzione per uscire App
public void close(View view)
{
System.exit(0);
}
}
和我的xml：
<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: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="com.n2d.survey.MainActivity$PlaceholderFragment" >
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="zona" />
<EditText
android:id="@+id/zone"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView1"
android:ems="10" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/zone"
android:layout_marginTop="16dp"
android:text="Ti rovi in (via/piazza/...)" />
<EditText
android:id="@+id/adress"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView2"
android:layout_below="@+id/textView2"
android:ems="10" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/adress"
android:layout_below="@+id/adress"
android:layout_marginTop="14dp"
android:text="Numero civico" />
<EditText
android:id="@+id/number"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView3"
android:layout_below="@+id/textView3"
android:ems="10" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/number"
android:layout_centerVertical="true"
android:text="Numero di famiglie" />
<EditText
android:id="@+id/families"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView4"
android:layout_below="@+id/textView4"
android:ems="10"
android:inputType="number" />
<Button
android:id="@+id/bottone_crea"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/textView3"
android:layout_below="@+id/families"
android:layout_marginTop="28dp"
android:onClick="Adddata"
android:text="Crea" />
<Button
android:id="@+id/bottone_mostra"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button1"
android:layout_alignParentBottom="true"
android:layout_marginBottom="25dp"
android:onClick="Showdata"
android:text="Mostra tabella" />
<Button
android:id="@+id/bottone_chiudi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/bottone_crea"
android:layout_alignBottom="@+id/bottone_crea"
android:layout_marginLeft="23dp"
android:layout_toRightOf="@+id/textView2"
android:onClick="close"
android:text="Chiudi" />
</RelativeLayout>
这是清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.n2d.survey"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.n2d.survey.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>
</application>
</manifest>
现在logcat说：
05-13 12:44:06.315: E/SQLiteLog(25213): (1) table Rilevamenti has 4 columns but 3 values were supplied
05-13 12:44:06.325: W/dalvikvm(25213): threadid=1: thread exiting with uncaught exception (group=0x416dee18)
05-13 12:44:06.335: E/AndroidRuntime(25213): FATAL EXCEPTION: main
05-13 12:44:06.335: E/AndroidRuntime(25213): Process: com.n2d.survey, PID: 25213
05-13 12:44:06.335: E/AndroidRuntime(25213): java.lang.IllegalStateException: Could not execute method of the activity
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.view.View$1.onClick(View.java:3865)
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.view.View.performClick(View.java:4480)
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.view.View$PerformClick.run(View.java:18673)
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.os.Handler.handleCallback(Handler.java:733)
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.os.Handler.dispatchMessage(Handler.java:95)
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.os.Looper.loop(Looper.java:157)
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.app.ActivityThread.main(ActivityThread.java:5872)
05-13 12:44:06.335: E/AndroidRuntime(25213): at java.lang.reflect.Method.invokeNative(Native Method)
05-13 12:44:06.335: E/AndroidRuntime(25213): at java.lang.reflect.Method.invoke(Method.java:515)
05-13 12:44:06.335: E/AndroidRuntime(25213): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1069)
05-13 12:44:06.335: E/AndroidRuntime(25213): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:885)
05-13 12:44:06.335: E/AndroidRuntime(25213): at dalvik.system.NativeStart.main(Native Method)
05-13 12:44:06.335: E/AndroidRuntime(25213): Caused by: java.lang.reflect.InvocationTargetException
05-13 12:44:06.335: E/AndroidRuntime(25213): at java.lang.reflect.Method.invokeNative(Native Method)
05-13 12:44:06.335: E/AndroidRuntime(25213): at java.lang.reflect.Method.invoke(Method.java:515)
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.view.View$1.onClick(View.java:3860)
05-13 12:44:06.335: E/AndroidRuntime(25213): ... 11 more
05-13 12:44:06.335: E/AndroidRuntime(25213): Caused by: android.database.sqlite.SQLiteException: table Rilevamenti has 4 columns but 3 values were supplied (code 1): , while compiling: INSERT INTO Rilevamenti VALUES('zbz','',''+'');
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:917)
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:528)
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1728)
05-13 12:44:06.335: E/AndroidRuntime(25213): at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1659)
05-13 12:44:06.335: E/AndroidRuntime(25213): at com.n2d.survey.MainActivity.Adddata(MainActivity.java:48)
05-13 12:44:06.335: E/AndroidRuntime(25213): ... 14 more
答案 0 :(得分：0)
请在插入声明中将+number+"'+'"+families+"替换为+number+"','"+families+"
另外，请注意这一点
通过以编程方式设置onClickListener（而不是通过XML），您可以省去很多麻烦。这可以帮助您完成您尝试做的事情：
Button button = findViewById(R.id.button);
button.setOnClickListener(
new OnClickListener() {
@Override
public void onClick(View v) {
/* DO SOMETHING UPON THE CLICK */
}
}
);