我尝试将SQLite示例代码导入到我的Android应用程序中，以使用ListView通过SQLite保存和管理我的数据。
在我填写新联系人的文本字段时实现AddressBook的SQLite示例中，我按下＆＃34; Save＆＃34;按钮将它们保存到我的SQLite，然后我的Android应用程序崩溃，显示不幸的是我的应用程序已经终止。我相信我的问题集中在按钮保存（button1），尤其是行：android：onClick =＆＃34;运行＆＃ 34;但是我不明白确切的问题。为方便起见，＆＃34;跑步＆＃34;在DisplayContact.java存档中实现。
我的activity_display_contact.xml布局中我的button1的代码是：
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editTextCity"
android:layout_alignParentBottom="true"
android:layout_marginBottom="28dp"
android:onClick="run"
android:text="@string/save" />
负责ListView布局的DisplayContact.java的代码是：
package com.qualcomm.QCARSamples.ImageTargets;
import com.qualcomm.QCARSamples.ImageTargets1.R;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class DisplayContact extends Activity {
int from_Where_I_Am_Coming = 0;
private DBHelper mydb ;
TextView name ;
TextView phone;
TextView email;
TextView street;
TextView place;
int id_To_Update = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_contact);
name = (TextView) findViewById(R.id.editTextName);
phone = (TextView) findViewById(R.id.editTextPhone);
email = (TextView) findViewById(R.id.editTextStreet);
street = (TextView) findViewById(R.id.editTextEmail);
place = (TextView) findViewById(R.id.editTextCity);
mydb = new DBHelper(this);
Bundle extras = getIntent().getExtras();
if(extras !=null)
{
int Value = extras.getInt("id");
if(Value>0){
//means this is the view part not the add contact part.
Cursor rs = mydb.getData(Value);
id_To_Update = Value;
rs.moveToFirst();
String nam = rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_NAME));
String phon = rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_PHONE));
String emai = rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_EMAIL));
String stree = rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_STREET));
String plac = rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_CITY));
if (!rs.isClosed())
{
rs.close();
}
Button b = (Button)findViewById(R.id.button1);
b.setVisibility(View.INVISIBLE);
name.setText((CharSequence)nam);
name.setFocusable(false);
name.setClickable(false);
phone.setText((CharSequence)phon);
phone.setFocusable(false);
phone.setClickable(false);
email.setText((CharSequence)emai);
email.setFocusable(false);
email.setClickable(false);
street.setText((CharSequence)stree);
street.setFocusable(false);
street.setClickable(false);
place.setText((CharSequence)plac);
place.setFocusable(false);
place.setClickable(false);
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
Bundle extras = getIntent().getExtras();
if(extras !=null)
{
int Value = extras.getInt("id");
if(Value>0){
getMenuInflater().inflate(R.menu.display_contact, menu);
}
else{
getMenuInflater().inflate(R.menu.mainmenu, menu);
}
}
return true;
}
public boolean onOptionsItemSelected(MenuItem item)
{
super.onOptionsItemSelected(item);
switch(item.getItemId())
{
case R.id.Edit_Contact:
Button b = (Button)findViewById(R.id.button1);
b.setVisibility(View.VISIBLE);
name.setEnabled(true);
name.setFocusableInTouchMode(true);
name.setClickable(true);
phone.setEnabled(true);
phone.setFocusableInTouchMode(true);
phone.setClickable(true);
email.setEnabled(true);
email.setFocusableInTouchMode(true);
email.setClickable(true);
street.setEnabled(true);
street.setFocusableInTouchMode(true);
street.setClickable(true);
place.setEnabled(true);
place.setFocusableInTouchMode(true);
place.setClickable(true);
return true;
case R.id.Delete_Contact:
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(R.string.deleteContact)
.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
mydb.deleteContact(id_To_Update);
Toast.makeText(getApplicationContext(), "Deleted Successfully", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getApplicationContext(),com.qualcomm.QCARSamples.ImageTargets.MainActivity.class);
startActivity(intent);
}
})
.setNegativeButton(R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User cancelled the dialog
}
});
AlertDialog d = builder.create();
d.setTitle("Are you sure");
d.show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void run(View view)
{
Bundle extras = getIntent().getExtras();
if(extras !=null)
{
int Value = extras.getInt("id");
if(Value>0){
if(mydb.updateContact(id_To_Update,name.getText().toString(), phone.getText().toString(), email.getText().toString(), street.getText().toString(), place.getText().toString())){
Toast.makeText(getApplicationContext(), "Updated", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getApplicationContext(),com.qualcomm.QCARSamples.ImageTargets.MainActivity.class);
startActivity(intent);
}
else{
Toast.makeText(getApplicationContext(), "not Updated", Toast.LENGTH_SHORT).show();
}
}
else{
if(mydb.insertContact(name.getText().toString(), phone.getText().toString(), email.getText().toString(), street.getText().toString(), place.getText().toString())){
Toast.makeText(getApplicationContext(), "done", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(getApplicationContext(), "not done", Toast.LENGTH_SHORT).show();
}
Intent intent = new Intent(getApplicationContext(),com.qualcomm.QCARSamples.ImageTargets.MainActivity.class);
startActivity(intent);
}
}
}
}
我的Logcat代码如下：
04-07 04:09:25.113: E/AndroidRuntime(7943): FATAL EXCEPTION: main
04-07 04:09:25.113: E/AndroidRuntime(7943): java.lang.IllegalStateException: Could not find a method run(View) in the activity class com.qualcomm.QCARSamples.ImageTargets.ImageTargets for onClick handler on view class android.widget.Button with id 'button1'
04-07 04:09:25.113: E/AndroidRuntime(7943): at android.view.View$1.onClick(View.java:3050)
04-07 04:09:25.113: E/AndroidRuntime(7943): at android.view.View.performClick(View.java:3534)
04-07 04:09:25.113: E/AndroidRuntime(7943): at android.view.View$PerformClick.run(View.java:14263)
04-07 04:09:25.113: E/AndroidRuntime(7943): at android.os.Handler.handleCallback(Handler.java:605)
04-07 04:09:25.113: E/AndroidRuntime(7943): at android.os.Handler.dispatchMessage(Handler.java:92)
04-07 04:09:25.113: E/AndroidRuntime(7943): at android.os.Looper.loop(Looper.java:137)
04-07 04:09:25.113: E/AndroidRuntime(7943): at android.app.ActivityThread.main(ActivityThread.java:4441)
04-07 04:09:25.113: E/AndroidRuntime(7943): at java.lang.reflect.Method.invokeNative(Native Method)
04-07 04:09:25.113: E/AndroidRuntime(7943): at java.lang.reflect.Method.invoke(Method.java:511)
04-07 04:09:25.113: E/AndroidRuntime(7943): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-07 04:09:25.113: E/AndroidRuntime(7943): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-07 04:09:25.113: E/AndroidRuntime(7943): at dalvik.system.NativeStart.main(Native Method)
04-07 04:09:25.113: E/AndroidRuntime(7943): Caused by: java.lang.NoSuchMethodException: run [class android.view.View]
04-07 04:09:25.113: E/AndroidRuntime(7943): at java.lang.Class.getConstructorOrMethod(Class.java:460)
04-07 04:09:25.113: E/AndroidRuntime(7943): at java.lang.Class.getMethod(Class.java:915)
04-07 04:09:25.113: E/AndroidRuntime(7943): at android.view.View$1.onClick(View.java:3043)
04-07 04:09:25.113: E/AndroidRuntime(7943): ... 11 more
答案 0 :(得分：0)
这很奇怪：您的Java代码创建一个名为“DisplayContact”的Activity，但堆栈跟踪表示它无法在名为“ImageTargets”的Activity中找到名为“run”的onClick处理程序。我会检查你的开发项目的设置方式。