我正在尝试运行一个应用程序，但当我选择一个菜单项时，该应用程序立即停止工作，并且出现以下错误:
logcat:
03-23 19:54:11.029: E/AndroidRuntime(1316): FATAL EXCEPTION: main
03-23 19:54:11.029: E/AndroidRuntime(1316): Process: com.example.testcalnd2, PID: 1316
03-23 19:54:11.029: E/AndroidRuntime(1316): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.testcalnd2/com.example.testcalnd2.ActivityDiaryEdit}: java.lang.IllegalAccessException: class com.example.testcalnd2.ActivityDiaryEdit is not accessible from class android.app.Instrumentation
03-23 19:54:11.029: E/AndroidRuntime(1316): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2236)
03-23 19:54:11.029: E/AndroidRuntime(1316): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
03-23 19:54:11.029: E/AndroidRuntime(1316): at android.app.ActivityThread.access$800(ActivityThread.java:151)
03-23 19:54:11.029: E/AndroidRuntime(1316): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
03-23 19:54:11.029: E/AndroidRuntime(1316): at android.os.Handler.dispatchMessage(Handler.java:102)
03-23 19:54:11.029: E/AndroidRuntime(1316): at android.os.Looper.loop(Looper.java:135)
03-23 19:54:11.029: E/AndroidRuntime(1316): at android.app.ActivityThread.main(ActivityThread.java:5257)
03-23 19:54:11.029: E/AndroidRuntime(1316): at java.lang.reflect.Method.invoke(Native Method)
03-23 19:54:11.029: E/AndroidRuntime(1316): at java.lang.reflect.Method.invoke(Method.java:372)
03-23 19:54:11.029: E/AndroidRuntime(1316): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
03-23 19:54:11.029: E/AndroidRuntime(1316): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
03-23 19:54:11.029: E/AndroidRuntime(1316): Caused by: java.lang.IllegalAccessException: class com.example.testcalnd2.ActivityDiaryEdit is not accessible from class android.app.Instrumentation
03-23 19:54:11.029: E/AndroidRuntime(1316): at java.lang.Class.newInstance(Class.java:1591)
03-23 19:54:11.029: E/AndroidRuntime(1316): at android.app.Instrumentation.newActivity(Instrumentation.java:1066)
03-23 19:54:11.029: E/AndroidRuntime(1316): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2226)
03-23 19:54:11.029: E/AndroidRuntime(1316): ... 10 more
03-23 19:54:20.399: I/Process(1316): Sending signal. PID: 1316 SIG: 9
MainActivity 类:
package com.example.testcalnd2;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
public class MainActivity extends ListActivity {
private static final int ACTIVITY_CREATE = 0;
private static final int ACTIVITY_EDIT = 1;
private static final int INSERT_ID = Menu.FIRST;
private static final int DELETE_ID = Menu.FIRST + 1;
private DiaryDbAdapter mDbHelper;
private Cursor mDiaryCursor;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.diary_list);
mDbHelper = new DiaryDbAdapter(this);
mDbHelper.open();
renderListView();
}
private void renderListView() {
mDiaryCursor = mDbHelper.getAllNotes();
startManagingCursor(mDiaryCursor);
String[] from = new String[] { DiaryDbAdapter.KEY_TITLE,
DiaryDbAdapter.KEY_CREATED };
int[] to = new int[] { R.id.text1, R.id.created };
SimpleCursorAdapter notes = new SimpleCursorAdapter(this,
R.layout.diary_now, mDiaryCursor, from, to);
setListAdapter(notes);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
menu.add(0, INSERT_ID, 0, R.string.menu_insert);
menu.add(0, DELETE_ID, 0, R.string.menu_delete);
return true;
}
@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
switch (item.getItemId()) {
case INSERT_ID:
createDiary();
return true;
case DELETE_ID:
mDbHelper.deleteDiary(getListView().getSelectedItemId());
renderListView();
return true;
}
return super.onMenuItemSelected(featureId, item);
}
private void createDiary() {
Intent i = new Intent(this, ActivityDiaryEdit.class);
startActivityForResult(i, ACTIVITY_CREATE);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
Cursor c = mDiaryCursor;
c.moveToPosition(position);
Intent i = new Intent(this, ActivityDiaryEdit.class);
i.putExtra(DiaryDbAdapter.KEY_ROWID, id);
i.putExtra(DiaryDbAdapter.KEY_TITLE, c.getString(c
.getColumnIndexOrThrow(DiaryDbAdapter.KEY_TITLE)));
i.putExtra(DiaryDbAdapter.KEY_BODY, c.getString(c
.getColumnIndexOrThrow(DiaryDbAdapter.KEY_BODY)));
startActivityForResult(i, ACTIVITY_EDIT);
}
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
renderListView();
}
}
package com.example.testcalnd2;
import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
DiaryDbAdapter:
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import java.util.Calendar;
import java.util.Date;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
class DiaryDbAdapter {
public static final String KEY_TITLE = "title";
public static final String KEY_BODY = "body";
public static final String KEY_ROWID = "_id";
public static final String KEY_CREATED = "created";
private static final String TAG = "DiaryDbAdapter";
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;
private static final String DATABASE_CREATE = "create table diary (_id integer primary key autoincrement, "
+ "title text not null, body text not null, created text not null);";
private static final String DATABASE_NAME = "database";
private static final String DATABASE_TABLE = "diary";
private static final int DATABASE_VERSION = 1;
private final Context mCtx;
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS diary");
onCreate(db);
}
}
public DiaryDbAdapter(Context ctx) {
this.mCtx = ctx;
}
public DiaryDbAdapter open() throws SQLException {
mDbHelper = new DatabaseHelper(mCtx);
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void closeclose() {
mDbHelper.close();
}
public long createDiary(String title, String body) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_TITLE, title);
initialValues.put(KEY_BODY, body);
Calendar calendar = Calendar.getInstance();
String created = calendar.get(Calendar.YEAR) + ""
+ calendar.get(Calendar.MONTH) + ""
+ calendar.get(Calendar.DAY_OF_MONTH) + ""
+ calendar.get(Calendar.HOUR_OF_DAY) + ""
+ calendar.get(Calendar.MINUTE) + "";
initialValues.put(KEY_CREATED, created);
return mDb.insert(DATABASE_TABLE, null, initialValues);
}
public boolean deleteDiary(long rowId) {
return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}
public Cursor getAllNotes() {
return mDb.query(DATABASE_TABLE, new String[] { KEY_ROWID, KEY_TITLE,
KEY_BODY, KEY_CREATED }, null, null, null, null, null);
}
public Cursor getDiary(long rowId) throws SQLException {
Cursor mCursor =
mDb.query(true, DATABASE_TABLE, new String[] { KEY_ROWID, KEY_TITLE,
KEY_BODY, KEY_CREATED }, KEY_ROWID + "=" + rowId, null, null,
null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
public boolean updateDiary(long rowId, String title, String body) {
ContentValues args = new ContentValues();
args.put(KEY_TITLE, title);
args.put(KEY_BODY, body);
Calendar calendar = Calendar.getInstance();
String created = calendar.get(Calendar.YEAR) + ""
+ calendar.get(Calendar.MONTH) + ""
+ calendar.get(Calendar.DAY_OF_MONTH) + ""
+ calendar.get(Calendar.HOUR_OF_DAY) + ""
+ calendar.get(Calendar.MINUTE) + "";
args.put(KEY_CREATED, created);
return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
}
}
ActivityDiaryEdit Activity :
class ActivityDiaryEdit extends Activity {
private EditText mTitleText;
private EditText mBodyText;
private Long mRowId;
private DiaryDbAdapter mDbHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDbHelper = new DiaryDbAdapter(this);
mDbHelper.open();
setContentView(R.layout.diary_edit);
mTitleText = (EditText) findViewById(R.id.title);
mBodyText = (EditText) findViewById(R.id.body);
Button confirmButton = (Button) findViewById(R.id.confirm);
mRowId = null;
Bundle extras = getIntent().getExtras();
if (extras != null) {
String title = extras.getString(DiaryDbAdapter.KEY_TITLE);
String body = extras.getString(DiaryDbAdapter.KEY_BODY);
mRowId = extras.getLong(DiaryDbAdapter.KEY_ROWID);
if (title != null) {
mTitleText.setText(title);
}
if (body != null) {
mBodyText.setText(body);
}
}
confirmButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
String title = mTitleText.getText().toString();
String body = mBodyText.getText().toString();
if (mRowId != null) {
mDbHelper.updateDiary(mRowId, title, body);
} else
mDbHelper.createDiary(title, body);
Intent mIntent = new Intent();
setResult(RESULT_OK, mIntent);
finish();
}
});
}
}
list :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.testcalnd2"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="22" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".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>
<activity
android:name=".DiaryDbAdapter"
android:label="@string/title_activity_diary_db_adapter" >
</activity>
<activity
android:name="com.example.testcalnd2.ActivityDiaryEdit">
</activity>
</application>
</manifest>
最佳答案
像这样公开你的类ActivityDiaryEdit:
public class ActivityDiaryEdit extends Activity {
...
希望这对您有所帮助!
关于android - java.lang.RuntimeException : Unable to instantiate activity ComponentInfo/is not accessible from class 错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36187928/