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所以，我一直在研究這個問題，並發現這個問題似乎發生時，它不能達到的東西，我引用在我的活動。我認爲這個問題可能在於我試圖達到課程申請，但我不確定。我試着評論與地理編碼相關的意圖，但仍然得到相同的錯誤，所以我不確定它在哪裏找到空指針。錯誤：「無法啓動活動ComponentInfo ...顯示java.lang.NullPointerException」
這是錯誤代碼我得到：
05-17 01:50:11.583: E/AndroidRuntime(23183): FATAL EXCEPTION: main
05-17 01:50:11.583: E/AndroidRuntime(23183): Process: com.binarsunset.topic, PID: 23183
05-17 01:50:11.583: E/AndroidRuntime(23183): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.binarsunset.topic/com.binarsunset.topic.CreateTopicActivity}: java.lang.NullPointerException
05-17 01:50:11.583: E/AndroidRuntime(23183): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2198)
05-17 01:50:11.583: E/AndroidRuntime(23183): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257)
05-17 01:50:11.583: E/AndroidRuntime(23183): at android.app.ActivityThread.access$800(ActivityThread.java:139)
05-17 01:50:11.583: E/AndroidRuntime(23183): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
05-17 01:50:11.583: E/AndroidRuntime(23183): at android.os.Handler.dispatchMessage(Handler.java:102)
05-17 01:50:11.583: E/AndroidRuntime(23183): at android.os.Looper.loop(Looper.java:136)
05-17 01:50:11.583: E/AndroidRuntime(23183): at android.app.ActivityThread.main(ActivityThread.java:5097)
05-17 01:50:11.583: E/AndroidRuntime(23183): at java.lang.reflect.Method.invokeNative(Native Method)
05-17 01:50:11.583: E/AndroidRuntime(23183): at java.lang.reflect.Method.invoke(Method.java:515)
05-17 01:50:11.583: E/AndroidRuntime(23183): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
05-17 01:50:11.583: E/AndroidRuntime(23183): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
05-17 01:50:11.583: E/AndroidRuntime(23183): at dalvik.system.NativeStart.main(Native Method)
05-17 01:50:11.583: E/AndroidRuntime(23183): Caused by: java.lang.NullPointerException
05-17 01:50:11.583: E/AndroidRuntime(23183): at com.binarsunset.topic.CreateTopicActivity.updateCharacterCountTextViewText(CreateTopicActivity.java:118)
05-17 01:50:11.583: E/AndroidRuntime(23183): at com.binarsunset.topic.CreateTopicActivity.onCreate(CreateTopicActivity.java:71)
05-17 01:50:11.583: E/AndroidRuntime(23183): at android.app.Activity.performCreate(Activity.java:5248)
05-17 01:50:11.583: E/AndroidRuntime(23183): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110)
05-17 01:50:11.583: E/AndroidRuntime(23183): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2162)
05-17 01:50:11.583: E/AndroidRuntime(23183): ... 11 more
所以我在活動開始TopicActivity但它不是我的主要，這裏是該代碼：
package com.binarsunset.topic;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
/**
* Created by Douglas on 5/3/2015.
*/
public class TopicActivity extends ActionBarActivity {
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_topic);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.topic_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.Create: {
aboutItemCreate();
return true;
}
default:
return super.onOptionsItemSelected(item);
}
}
private void aboutItemCreate(){
Intent intent = new Intent(getApplicationContext(), CreateTopicActivity.class);
startActivity(intent);
}
}
我點擊在操作欄上創建活動，這會將我帶到CreateTopicActivity，並且此處它崩潰的位置是CreateTopicAcvivity的代碼：
package com.binarsunset.topic;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.location.Location;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import com.parse.ParseACL;
import com.parse.ParseException;
import com.parse.ParseGeoPoint;
import com.parse.ParseUser;
import com.parse.SaveCallback;
/**
* Created by Douglas on 5/16/2015.
*/
public class CreateTopicActivity extends Activity {
// UI references.
private EditText createTopicEditText;
private TextView characterCountTextView;
private Button createButton;
private int maxCharacterCount = Application.getConfigHelper().getPostMaxCharacterCount();
private ParseGeoPoint geoPoint;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_topic);
Intent intent = getIntent();
Location location = intent.getParcelableExtra(Application.INTENT_EXTRA_LOCATION);
geoPoint = new ParseGeoPoint(location.getLatitude(), location.getLongitude());
createTopicEditText = (EditText) findViewById(R.id.create_topic_title);
createTopicEditText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
}
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
}
@Override
public void afterTextChanged(Editable s) {
updateTopicButtonState();
updateCharacterCountTextViewText();
}
});
characterCountTextView = (TextView) findViewById(R.id.character_count_textview);
createButton = (Button) findViewById(R.id.create_topic_button);
createButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
createTopic();
}
});
updateTopicButtonState();
updateCharacterCountTextViewText();
}
private void createTopic() {
String text = createTopicEditText.getText().toString().trim();
// Set up a progress dialog
final ProgressDialog dialog = new ProgressDialog(CreateTopicActivity.this);
dialog.setMessage(getString(R.string.progress_topic));
dialog.show();
// Create a post.
AnywallPost topic = new AnywallPost();
// Set the location to the current user's location
topic.setLocation(geoPoint);
topic.setText(text);
topic.setUser(ParseUser.getCurrentUser());
topic.setInt(1);
ParseACL acl = new ParseACL();
// Give public read access
acl.setPublicReadAccess(true);
topic.setACL(acl);
// Save the topic
topic.saveInBackground(new SaveCallback() {
@Override
public void done(ParseException e) {
dialog.dismiss();
finish();
}
});
}
private String getTopicEditTextText() {
return createTopicEditText.getText().toString().trim();
}
private void updateTopicButtonState() {
int length = getTopicEditTextText().length();
boolean enabled = length > 0 && length < maxCharacterCount;
createButton.setEnabled(enabled);
}
private void updateCharacterCountTextViewText() {
String characterCountString = String.format("%d/%d", createTopicEditText.length(), maxCharacterCount);
characterCountTextView.setText(characterCountString);
}
}
這裏是我的清單：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.binarsunset.topic"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="19" />
<permission
android:name="com.binarsunset.Topic.permission.MAPS_RECEIVE"
android:protectionLevel="signature" >
</permission>
<uses-permission android:name="com.parse.anywall.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<!--
The following permission is not required to use
Google Maps Android API v2, but is recommended.
-->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<application
android:name=".Application"
android:allowBackup="true"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:screenOrientation="portrait" />
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyCVz0h90fBZwkcgagi1Q7WV1W_cVgd0_QA" />
<meta-data android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<activity
android:name=".LoginActivity"
android:label="@string/title_activity_login"
android:screenOrientation="portrait" />
<activity
android:name=".SignUpActivity"
android:label="@string/title_activity_signup"
android:screenOrientation="portrait" />
<activity
android:name=".DispatchActivity"
android:noHistory="true" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".WelcomeActivity"
android:label="@string/app_name"
android:screenOrientation="portrait"
android:theme="@android:style/Theme.Holo" />
<activity
android:name=".PostActivity"
android:label="@string/activity_post_title"
android:windowSoftInputMode="adjustResize" />
<activity
android:name=".TopicActivity"
android:label="Topic" />
<activity
android:name=".PostCommentsActivity"
android:label="PostComments" />
<activity
android:name=".SettingsActivity"
android:label="@string/title_activity_settings" />
<activity
android:name=".LocationActivity"
android:label="Location" />
<activity
android:name=".CreateTopicActivity"
android:label="CreateTopic" />
</application>
</manifest>
這裏是我的activity_create_topic.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=".PostActivity"
>
<EditText
android:id="@+id/create_topic_title"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:background="@null"
android:hint="@string/create_topic_title"
android:inputType="text"
android:gravity="top"
android:layout_above="@+id/create_topic_details">
<requestFocus />
</EditText>
<EditText
android:id="@+id/create_topic_details"
android:layout_width="fill_parent"
android:layout_height="300dp"
android:layout_above="@+id/character_count_Create_Details"
android:background="@null"
android:hint="@string/create_topic_details"
android:inputType="textMultiLine"
android:gravity="top" >
<requestFocus />
</EditText>
<Button
android:id="@+id/create_topic_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true"
android:text="@string/Create_text" />
<TextView
android:id="@+id/character_count_Create_Details"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true"
android:layout_marginBottom="@dimen/activity_vertical_margin"
android:layout_above="@id/create_topic_button"
android:text="@string/character_count_placeholder"
android:textAppearance="?android:attr/textAppearanceSmall" />
</RelativeLayout>
讓我知道如果你需要任何額外的代碼。感謝您的時間。
編輯：另外我註釋掉了一切，但佈局創造者在我CreateTopicActivity和它跑不崩潰如此看來問題就出在CreateTopicActivity的代碼。這導致我相信它的地理編碼或應用程序的引用，但即使我知道這是我仍然是新的錯誤，所以我真的不知道我會如何解決這個問題或爲什麼這是一個問題第一個地方。
，的CreateTopicActivity。 – theapache64