Я пытаюсь получить значение входного сигнала от EditText в SearchUser для запроса в SEARCHRESULTjava.lang.RuntimeException: Невозможно начать деятельность ComponentInfo (Android Eclipse)
Вот мой код для SearchUser:
package com.example.yearbookmuict9sec2;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.EditText;
public class SearchUser extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search_user);
addButtonListenerHomeButton();
addButtonListenerViewAll();
addButtonListenerSearchButton();
}
private void addButtonListenerSearchButton() {
// TODO Auto-generated method stub
Button button = (Button) findViewById(R.id.SearchButton);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
EditText edtSearch;
String Answer;
edtSearch = (EditText)findViewById(R.id.answer);
Answer = edtSearch.getText().toString();
Intent goAnswer = new Intent(getApplicationContext(),SearchResult.class);
goAnswer.putExtra("Answer", Answer);
startActivity(goAnswer);
}
});
}
private void addButtonListenerViewAll() {
// TODO Auto-generated method stub
Button button = (Button) findViewById(R.id.viewALLBUTTON);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent i = new Intent(SearchUser.this,ViewAll.class);
startActivity(i);
}
});
}
private void addButtonListenerHomeButton() {
// TODO Auto-generated method stub
ImageButton button = (ImageButton) findViewById(R.id.HomeButton);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent i = new Intent(SearchUser.this,Home.class);
startActivity(i);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.search_user, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Вот мой activity_search_user:
<ScrollView
android:id="@+id/scrollView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ImageButton
android:id="@+id/HomeButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/home1"
android:layout_alignTop="@+id/scrollView4"
android:background="#fffbf8f0"
android:src="@drawable/ic_home_black_24dp" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/home1"
android:layout_below="@+id/HomeButton"
android:text="Back Home" />
<Button
android:id="@+id/viewALLBUTTON"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/SearchButton"
android:layout_alignBottom="@+id/SearchButton"
android:layout_marginRight="20dp"
android:layout_toLeftOf="@+id/HomeButton"
android:background="#ffff6c41"
android:text="View All"
android:textColor="#ffffffff" />
<ImageView
android:id="@+id/home1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView1"
android:layout_centerHorizontal="true"
android:layout_marginTop="27dp"
android:src="@drawable/logo_180" />
<Button
android:id="@+id/SearchButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/home1"
android:layout_below="@+id/home1"
android:layout_marginLeft="56dp"
android:layout_marginTop="47dp"
android:background="#ff606efd"
android:nestedScrollingEnabled="false"
android:text="Search"
android:textColor="#ffffffff" />
<EditText
android:id="@+id/answer"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/viewALLBUTTON"
android:layout_alignParentRight="true"
android:ems="10"
android:inputType="text" >
<requestFocus />
</EditText>
Вот мой код SEARCHRESULT:
package com.example.yearbookmuict9sec2;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
public class SearchResult extends Activity {
SQLiteDatabase mDb;
Database mHelper;
Cursor mCursor;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search_result);
EditText txtAnswer;
Button btnBack;
String showAnswer;
txtAnswer = (EditText)findViewById(R.id.answer);
btnBack = (Button)findViewById(R.id.SearchButton);
showAnswer = getIntent().getStringExtra("Answer");
txtAnswer.setText(showAnswer);
ListView listView1 = (ListView)findViewById(R.id.listView1);
mHelper = new Database(this);
mDb = mHelper.getWritableDatabase();
mHelper.onUpgrade(mDb, 1, 1);
mCursor = mDb.rawQuery("SELECT " + Database.COL_StudentID + ", "
+ Database.COL_FNAME + ", " + Database.COL_LNAME+ ", "
+ Database.COL_NNAME + " FROM " + Database.TABLE_NAME +" WHERE "
+ Database.COL_StudentID + " = ?", new String[] {showAnswer});
ArrayList<String> dirArray = new ArrayList<String>();
mCursor.moveToFirst();
while (!mCursor.isAfterLast()){
dirArray.add("ID : " + mCursor.getString(mCursor.getColumnIndex(Database.COL_StudentID)) + "\n"
+ "Firstname : " + mCursor.getString(mCursor.getColumnIndex(Database.COL_FNAME)) + "\n"
+ "Lastname : " + mCursor.getString(mCursor.getColumnIndex(Database.COL_LNAME)) + "\n"
+ "Nickname : " + mCursor.getString(mCursor.getColumnIndex(Database.COL_NNAME)));
mCursor.moveToNext();
}
ArrayAdapter<String> adapterDir = new ArrayAdapter<String>(getApplicationContext()
, android.R.layout.simple_list_item_1, dirArray);
listView1.setAdapter(adapterDir);
List<Map<String, String>> data = new ArrayList<Map<String, String>>();
Map<String, String> datum = new HashMap<String, String>(2);
datum.put("First Line", "First line of text");
datum.put("Second Line","Second line of text");
data.add(datum);
SimpleAdapter adapter = new SimpleAdapter(this, data,
android.R.layout.simple_list_item_2,
new String[] {"First Line", "Second Line" },
new int[] {android.R.id.text1, android.R.id.text2 });
}
public void onPause() {
super.onPause();
mHelper.close();
mDb.close();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.search_result, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Вот мой activity_search_result:
<Button
android:id="@+id/backToHome"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignRight="@+id/listView1"
android:layout_toEndOf="@+id/imageView"
android:background="#ffafff9b"
android:text="Back to Home" />
<TextView
android:id="@+id/textView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:gravity="center"
android:text="Student"
android:textColor="#FFFFFF"
android:textSize="40dp" />
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/textView1"
android:layout_centerHorizontal="true"
android:layout_margin="30dp"
android:cacheColorHint="#00000000" >
</ListView>
</RelativeLayout>
Вот мой LogCat:
12-09 03:57:09.421: E/AndroidRuntime(4961): FATAL EXCEPTION: main
12-09 03:57:09.421: E/AndroidRuntime(4961): Process: com.example.yearbookmuict9sec2, PID: 4961
12-09 03:57:09.421: E/AndroidRuntime(4961): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.yearbookmuict9sec2/com.example.yearbookmuict9sec2.SearchResult}: java.lang.NullPointerException
12-09 03:57:09.421: E/AndroidRuntime(4961): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
12-09 03:57:09.421: E/AndroidRuntime(4961): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
12-09 03:57:09.421: E/AndroidRuntime(4961): at android.app.ActivityThread.access$800(ActivityThread.java:135)
12-09 03:57:09.421: E/AndroidRuntime(4961): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
12-09 03:57:09.421: E/AndroidRuntime(4961): at android.os.Handler.dispatchMessage(Handler.java:102)
12-09 03:57:09.421: E/AndroidRuntime(4961): at android.os.Looper.loop(Looper.java:136)
12-09 03:57:09.421: E/AndroidRuntime(4961): at android.app.ActivityThread.main(ActivityThread.java:5001)
12-09 03:57:09.421: E/AndroidRuntime(4961): at java.lang.reflect.Method.invokeNative(Native Method)
12-09 03:57:09.421: E/AndroidRuntime(4961): at java.lang.reflect.Method.invoke(Method.java:515)
12-09 03:57:09.421: E/AndroidRuntime(4961): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
12-09 03:57:09.421: E/AndroidRuntime(4961): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
12-09 03:57:09.421: E/AndroidRuntime(4961): at dalvik.system.NativeStart.main(Native Method)
12-09 03:57:09.421: E/AndroidRuntime(4961): Caused by: java.lang.NullPointerException
12-09 03:57:09.421: E/AndroidRuntime(4961): at com.example.yearbookmuict9sec2.SearchResult.onCreate(SearchResult.java:39)
12-09 03:57:09.421: E/AndroidRuntime(4961): at android.app.Activity.performCreate(Activity.java:5231)
12-09 03:57:09.421: E/AndroidRuntime(4961): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
12-09 03:57:09.421: E/AndroidRuntime(4961): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
12-09 03:57:09.421: E/AndroidRuntime(4961): ... 11 more
Помогите мне пожалуйста. Что я должен сделать, чтобы исправить эту проблему? Я здесь новенький.
Что такое линия (SearchResult.java:39).Вы получаете NULL там –
Может ли один из ваших элементов оставаться неинициализированным, проверить его – Saif