Question

我制作了一个简单的应用程序，用于保存和显示书签通过单击主活动中的菜单项来调用视图书签活动。

问题是当我单击选项查看存储在视图书签Activity中的书签时，我的应用程序崩溃了。
我认为问题在于书签Activity，因为我有一个未使用的导入语句AdapterView.OnItemClickListener＆amp; content.Context。

如何解决此问题？

PS：当我点击主Activity中的选项以通过启动保存书签活动来保存书签时，它可以很好地工作。

这是我的代码：

BookmarkPage.class

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;

import android.view.KeyEvent;
import android.view.View;

import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

import java.util.ArrayList;




public class BookmarkPage extends Activity {
public final static String EXTRA_MESSAGE = "MESSAGE";
private ListView obj;
DBHelper mydb;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.bookmark_page);

    mydb = new DBHelper(this);
    ArrayList array_list = mydb.getAllBookmarks();
    ArrayAdapter arrayAdapter=new ArrayAdapter(this,android.R.layout.simple_list_item_1, array_list);

    obj = (ListView)findViewById(R.id.listView1);
    obj.setAdapter(arrayAdapter);
    obj.setOnItemClickListener(new AdapterView.OnItemClickListener(){
        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {
            // TODO Auto-generated method stub
            int id_To_Search = arg2 + 1;

            Bundle dataBundle = new Bundle();
            dataBundle.putInt("id", id_To_Search);

            Intent intent = new Intent(getApplicationContext(),DisplayBookmarks.class);

            intent.putExtras(dataBundle);
            startActivity(intent);
        }
    });
}

public boolean onKeyDown(int keycode, KeyEvent event) {
    if (keycode == KeyEvent.KEYCODE_BACK) {
        moveTaskToBack(true);
    }
    return super.onKeyDown(keycode, event);
}
}

bookmark_page.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=".BookmarkPage">



<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:text="Bookmarks"
    android:textSize="30sp" />

<ListView
    android:id="@+id/listView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/textView">
</ListView>


</RelativeLayout>

logcat的：

    OpenGL ES Shader Compiler Version: E031.25.03.00
Build Date: 12/04/14 Thu
Local Branch:
Remote Branch: quic/LA.BF.1.1_rb1.14
Local Patches: NONE
Reconstruct Branch: AU_LINUX_ANDROID_LA.BF.1.1_RB1.05.00.00.002.030 +  NOTHING
10-03 18:10:35.793  18581-18642/com.carsaleindiaofficial.csitestapp W/cr.media﹕ Requires BLUETOOTH permission
10-03 18:10:35.830  18581-18581/com.carsaleindiaofficial.csitestapp E/libEGL﹕ validate_display:255 error 3008 (EGL_BAD_DISPLAY)
10-03 18:10:35.890  18581-18581/com.carsaleindiaofficial.csitestapp I/art﹕ Rejecting re-init on previously-failed class java.lang.Class<com.android.webview.chromium.FloatingSelectActionModeCallback>
10-03 18:10:35.891  18581-18581/com.carsaleindiaofficial.csitestapp I/art﹕ Rejecting re-init on previously-failed class java.lang.Class<com.android.webview.chromium.FloatingSelectActionModeCallback>
10-03 18:10:35.922  18581-18581/com.carsaleindiaofficial.csitestapp I/art﹕ Rejecting re-init on previously-failed class java.lang.Class<com.android.webview.chromium.WebViewContentsClientAdapter$WebResourceErrorImpl>
10-03 18:10:35.922  18581-18581/com.carsaleindiaofficial.csitestapp I/art﹕ Rejecting re-init on previously-failed class java.lang.Class<com.android.webview.chromium.WebViewContentsClientAdapter$WebResourceErrorImpl>
10-03 18:10:36.276  18581-18581/com.carsaleindiaofficial.csitestapp W/art﹕ Attempt to remove local handle scope entry from IRT, ignoring
10-03 18:10:36.318  18581-18581/com.carsaleindiaofficial.csitestapp W/AwContents﹕ onDetachedFromWindow called when already detached. Ignoring
10-03 18:10:36.836  18581-18681/com.carsaleindiaofficial.csitestapp D/OpenGLRenderer﹕ Render dirty regions requested: true
10-03 18:10:36.902  18581-18581/com.carsaleindiaofficial.csitestapp D/Atlas﹕ Validating map...
10-03 18:10:36.944  18581-18639/com.carsaleindiaofficial.csitestapp W/chromium﹕ [WARNING:data_reduction_proxy_config.cc(630)] SPDY proxy OFF at startup
10-03 18:10:37.192  18581-18681/com.carsaleindiaofficial.csitestapp I/OpenGLRenderer﹕ Initialized EGL, version 1.4
10-03 18:10:37.201  18581-18681/com.carsaleindiaofficial.csitestapp D/OpenGLRenderer﹕ Enabling debug mode 0
10-03 18:10:38.109  18581-18581/com.carsaleindiaofficial.csitestapp I/Choreographer﹕ Skipped 49 frames!  The application may be doing too much work on its main thread.
10-03 18:10:38.213  18581-18581/com.carsaleindiaofficial.csitestapp I/progressBar﹕ Visible
10-03 18:10:38.222  18581-18596/com.carsaleindiaofficial.csitestapp I/art﹕ Background sticky concurrent mark sweep GC freed 10653(792KB) AllocSpace objects, 6(92KB) LOS objects, 12% free, 6MB/7MB, paused 1.507ms total 130.800ms
10-03 18:10:38.894  18581-18581/com.carsaleindiaofficial.csitestapp W/cr.BindingManager﹕ Cannot call determinedVisibility() - never saw a connection for the pid: 18581
10-03 18:10:41.925  18581-18596/com.carsaleindiaofficial.csitestapp I/art﹕ Background partial concurrent mark sweep GC freed 12880(607KB) AllocSpace objects, 1(39KB) LOS objects, 40% free, 7MB/11MB, paused 1.053ms total 158.419ms
10-03 18:10:42.812  18581-18581/com.carsaleindiaofficial.csitestapp W/cr.BindingManager﹕ Cannot call determinedVisibility() - never saw a connection for the pid: 18581
10-03 18:10:43.549  18581-18581/com.carsaleindiaofficial.csitestapp W/cr.BindingManager﹕ Cannot call determinedVisibility() - never saw a connection for the pid: 18581

问题在进度条之后开始：消失（即当我按下查看保存的书签选项时）

10-03 21:13:12.096  18489-18489/com.carsaleindiaofficial.csitestapp I/pageFinished﹕ yesss
10-03 21:13:12.353  18489-18489/com.carsaleindiaofficial.csitestapp I/progressBar﹕ Gone
10-03 21:13:26.413  18489-18489/com.carsaleindiaofficial.csitestapp I/Choreographer﹕ Skipped 64 frames!  The application may be doing too much work on its main thread.
10-03 21:13:28.701  18489-18489/com.carsaleindiaofficial.csitestapp W/art﹕ Before Android 4.1, method int android.support.v7.internal.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
10-03 21:13:30.289  18489-18489/com.carsaleindiaofficial.csitestapp I/Choreographer﹕ Skipped 129 frames!  The application may be doing too much work on its main thread.
10-03 21:13:31.604  18489-18489/com.carsaleindiaofficial.csitestapp I/Choreographer﹕ Skipped 78 frames!  The application may be doing too much work on its main thread.
10-03 21:13:33.328  18489-18489/com.carsaleindiaofficial.csitestapp I/Choreographer﹕ Skipped 80 frames!  The application may be doing too much work on its main thread.
10-03 21:13:35.714  18489-18489/com.carsaleindiaofficial.csitestapp I/Choreographer﹕ Skipped 38 frames!  The application may be doing too much work on its main thread.
10-03 21:13:36.532  18489-18489/com.carsaleindiaofficial.csitestapp I/Choreographer﹕ Skipped 44 frames!  The application may be doing too much work on its main thread.
10-03 21:13:37.719  18489-18489/com.carsaleindiaofficial.csitestapp E/CursorWindow﹕ Failed to read row 0, column -1 from a CursorWindow which has 9 rows, 2 columns.
10-03 21:13:37.777  18489-18489/com.carsaleindiaofficial.csitestapp D/AndroidRuntime﹕ Shutting down VM
10-03 21:13:37.892  18489-18489/com.carsaleindiaofficial.csitestapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.carsaleindiaofficial.csitestapp, PID: 18489
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.carsaleindiaofficial.csitestapp/com.carsaleindiaofficial.csitestapp.BookmarkPage}: java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2314)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2388)
        at android.app.ActivityThread.access$800(ActivityThread.java:148)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5312)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
 Caused by: java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.
        at android.database.CursorWindow.nativeGetString(Native Method)
        at android.database.CursorWindow.getString(CursorWindow.java:438)
        at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51)
        at com.carsaleindiaofficial.csitestapp.DBHelper.getAllBookmarks(DBHelper.java:90)
        at com.carsaleindiaofficial.csitestapp.BookmarkPage.onCreate(BookmarkPage.java:32)
        at android.app.Activity.performCreate(Activity.java:5953)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1128)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2267)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2388)
        at android.app.ActivityThread.access$800(ActivityThread.java:148)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5312)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
10-03 21:13:43.601  18489-18489/com.carsaleindiaofficial.csitestapp I/Process﹕ Sending signal. PID: 18489 SIG: 9

我的数据库：DBHelper.class

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Hashtable;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.DatabaseUtils;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase;

public class DBHelper extends SQLiteOpenHelper {

public static final String DATABASE_NAME = "MyDBName.db";
public static final String BOOKMARKS_TABLE_NAME = "bookmarks";
public static final String BOOKMARKS_COLUMN_ID = "id";
public static final String BOOKMARKS_COLUMN_NAME = "bmtitle";
private HashMap hp;

public DBHelper(Context context)
{
    super(context, DATABASE_NAME , null, 1);
}

@Override
public void onCreate(SQLiteDatabase db) {
    // TODO Auto-generated method stub
    db.execSQL(
            "create table bookmarks " +
                    "(id integer primary key, bmtitle text)"
    );
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // TODO Auto-generated method stub
    db.execSQL("DROP TABLE IF EXISTS bookmarks");
    onCreate(db);
}

public boolean insertBookmark  (String title)
{
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues contentValues = new ContentValues();
    contentValues.put("dbtitle", title);
    db.insert("bookmarks", null, contentValues);
    return true;
}

public Cursor getData(int id){
    SQLiteDatabase db = this.getReadableDatabase();
    Cursor res =  db.rawQuery( "select * from bookmarks where id="+id+"", null );
    return res;
}

public int numberOfRows(){
    SQLiteDatabase db = this.getReadableDatabase();
    int numRows = (int) DatabaseUtils.queryNumEntries(db, BOOKMARKS_TABLE_NAME);
    return numRows;
}

public boolean updateBookmark (Integer id, String title)
{
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues contentValues = new ContentValues();
    contentValues.put("name", title);
    db.update("bookmarks", contentValues, "id = ? ", new String[] { Integer.toString(id) } );
    return true;
}

public Integer deleteBookmark (Integer id)
{
    SQLiteDatabase db = this.getWritableDatabase();
    return db.delete("bookmarks",
            "id = ? ",
            new String[] { Integer.toString(id) });
}

public ArrayList<String> getAllBookmarks()
{
    ArrayList<String> array_list = new ArrayList<String>();

    //hp = new HashMap();
    SQLiteDatabase db = this.getReadableDatabase();
    Cursor res =  db.rawQuery( "select * from bookmarks", null );
    res.moveToFirst();

    while(res.isAfterLast() == false){
        array_list.add(res.getString(res.getColumnIndex(BOOKMARKS_COLUMN_NAME)));
        res.moveToNext();
    }
    return array_list;
}
}

MainActivity.class

import android.annotation.SuppressLint;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ImageView;
import android.widget.ProgressBar;

@SuppressLint("SetJavaScriptEnabled")

public class MainActivity extends  AppCompatActivity {



private WebView view;
ProgressBar progressBar;
ImageView im;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getSupportActionBar().setDisplayShowHomeEnabled(true);
    getSupportActionBar().setLogo(R.drawable.ic_launcher);
    getSupportActionBar().setDisplayUseLogoEnabled(true);
    setContentView(R.layout.activity_main);

    progressBar = (ProgressBar) this.findViewById(R.id.progressBar1);
    im = (ImageView) this.findViewById(R.id.imageView2);
    String url = "http://www.carsaleindiaofficial.com/?m=1";
    view = (WebView) this.findViewById(R.id.webView);
    view.setWebViewClient(new MyWebViewClient());
    view.getSettings().setJavaScriptEnabled(true);
    view.getSettings().setDomStorageEnabled(true);
    view.loadUrl(url);

}

public class MyWebViewClient extends WebViewClient {

    @Override
    public void onPageFinished(WebView view, String url) {
        super.onPageFinished(view, url);
        Log.i("pageFinished", "yesss");
        progressBar.setVisibility(View.GONE);
        im.setVisibility(View.GONE);
        Log.i("progressBar", "Gone");
    }

    @Override
    public void onPageStarted(WebView view, String url, Bitmap favicon) {
        progressBar.setVisibility(View.VISIBLE);
        Log.i("progressBar", "Visible");
        super.onPageStarted(view, url, favicon);
    }


    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        if(Uri.parse(url).getHost().endsWith("carsaleindiaofficial.com"))  {
            Log.i("ShldOvrideUrl", "CSI");
            return false;
        }
        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
        view.getContext().startActivity(intent);
        Log.i("ShldOvrideUrl", "OtherSite");
        return true;

    }

}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}


@Override
public boolean onOptionsItemSelected(MenuItem item){
    super.onOptionsItemSelected(item);

    switch(item.getItemId())
    {
        case R.id.add_bookmark:
            Bundle dataBundle = new Bundle();
            dataBundle.putInt("id", 0);
            Log.i("addBookmark", "loadingAddBookmark");
            Intent intent = new Intent(getApplicationContext(),DisplayBookmarks.class);
            intent.putExtras(dataBundle);

            startActivity(intent);
            return true;

        case R.id.show_bookmark:
            Log.i("showBookmark", "loadingShowBookmark");
            Intent intent2 = new Intent(getApplicationContext(),BookmarkPage.class);
            startActivity(intent2);
            return true;

        case R.id.action_reload:
        Log.i("actionReload", "ReloadingURL");
        view.loadUrl(view.getUrl());


        default:
            return super.onOptionsItemSelected(item);
    }
}



@Override
public void onBackPressed() {
    if (view.canGoBack()) {
        view.goBack();
    } else {
        super.onBackPressed();
    }
}

}

Answer 1

这是你的错误：

Failed to read row 0, column -1 from a CursorWindow which has 9 rows, 2 columns. ... Caused by: java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.

这是因为你创建了这个表：

@Override
public void onCreate(SQLiteDatabase db) {
    // TODO Auto-generated method stub
    db.execSQL(
            "create table bookmarks " +
                    "(id integer primary key, dbtitle text)"
    );
}

然后您尝试访问不存在的列：

while(res.isAfterLast() == false){
    array_list.add(res.getString(res.getColumnIndex(BOOKMARKS_COLUMN_NAME)));
    res.moveToNext();
}

其定义为字符串常量：

public static final String BOOKMARKS_COLUMN_NAME = "bmtitle";

但它不是作为表格列创建的。

column -1表示您的表格中没有名为bmtitle的列这是正确的，因为相反，有一个名为dbtitle的列。

快速修复：

只需更改

public static final String BOOKMARKS_COLUMN_NAME = "bmtitle";

到

public static final String BOOKMARKS_COLUMN_NAME = "dbtitle";

错误：未使用的Import语句 - 导入android.widget.AdapterView.OnItemClickListener; ＆安培; import android.content.Context;

1 个答案: