Question

我按下TestDBIIIIActivity类中的按钮show来改变从main到showdata的界面。和弹出窗口显示强制关闭。

来自LogCat

01-11 16:39:43.434: E/AndroidRuntime(13835): FATAL EXCEPTION: main
01-11 16:39:43.434: E/AndroidRuntime(13835): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.app.testdbiiii/com.app.testdbiiii.ShowData}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
01-11 16:39:43.434: E/AndroidRuntime(13835):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at android.app.ActivityThread.access$1500(ActivityThread.java:117)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at android.os.Handler.dispatchMessage(Handler.java:99)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at android.os.Looper.loop(Looper.java:123)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at android.app.ActivityThread.main(ActivityThread.java:3683)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at java.lang.reflect.Method.invokeNative(Native Method)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at java.lang.reflect.Method.invoke(Method.java:507)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at dalvik.system.NativeStart.main(Native Method)
01-11 16:39:43.434: E/AndroidRuntime(13835): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
01-11 16:39:43.434: E/AndroidRuntime(13835):    at android.app.ListActivity.onContentChanged(ListActivity.java:243)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:210)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at android.app.Activity.setContentView(Activity.java:1657)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at com.app.testdbiiii.ShowData.onCreate(ShowData.java:27)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
01-11 16:39:43.434: E/AndroidRuntime(13835):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
01-11 16:39:43.434: E/AndroidRuntime(13835):    ... 11 more

来自Class TestDBIIIIActivity

public class TestDBIIIIActivity extends Activity {
Button add,show;
EditText name;
TextView time;
private DatabaseAdapter myDatabaseAdapter;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    add = (Button)findViewById(R.id.add);
    show =(Button)findViewById(R.id.show);
    name =(EditText)findViewById(R.id.name);
    time =(TextView)findViewById(R.id.time);

    myDatabaseAdapter = new DatabaseAdapter(this);
    myDatabaseAdapter.openToWrite();

    add.setOnClickListener(buttonAddOnClickListener);
    show.setOnClickListener(buttonShowClickListener);

}

Button.OnClickListener buttonShowClickListener = new Button.OnClickListener() {
    public void onClick(View v) {
        // TODO Auto-generated method stub
        Intent intent = new Intent(getBaseContext(), ShowData.class);
        startActivity(intent);

    }
};

Button.OnClickListener buttonAddOnClickListener = new Button.OnClickListener() {

    @Override
    public void onClick(View arg0) {
        // TODO Auto-generated method stub
        String data1 = name.getText().toString();
        String data2 = time.getText().toString();
        myDatabaseAdapter.insert(data1, data2);

    }

};

}

来自ShowData数据

public class ShowData extends ListActivity {
Button refresh;
private DatabaseAdapter myDatabaseAdapter;
SimpleCursorAdapter cursorAdapter;
Cursor cursor;
ListView listContent;


public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.showdata);
    cursor = myDatabaseAdapter.queueAll();
    refresh = (Button) findViewById(R.id.button1);
    listContent = (ListView) findViewById(R.id.contentlist);   

    String[] from = new String[] { DatabaseAdapter.KEY_ID,DatabaseAdapter.KEY_CONTENT1, DatabaseAdapter.KEY_CONTENT2 };
    int[] to = new int[] { R.id.id, R.id.text1, R.id.text2 };
    cursorAdapter = new SimpleCursorAdapter(this, R.layout.list_item, cursor,from, to);
    listContent.setAdapter(cursorAdapter);

    myDatabaseAdapter = new DatabaseAdapter(this);

    refresh.setOnClickListener(buttonRefreshClickListener);
}

Button.OnClickListener buttonRefreshClickListener = new Button.OnClickListener() {

    @Override
    public void onClick(View arg0) {
        // TODO Auto-generated method stub
        updateList();
    }

};


private void updateList() {
    cursor.requery();
}

}

来自Class DatabaseAdapter

public class DatabaseAdapter {
public static final String MYDATABASE_NAME = "MY_DATABASE";
public static final String MYDATABASE_TABLE = "MY_TABLE";
public static final int MYDATABASE_VERSION = 1;
public static final String KEY_ID = "_id";
public static final String KEY_CONTENT1 = "Name";
public static final String KEY_CONTENT2 = "Time";

// create table MY_DATABASE (ID integer primary key, Content text not null);
private static final String SCRIPT_CREATE_DATABASE = "create table "+ MYDATABASE_TABLE + " (" + KEY_ID+ " integer primary key autoincrement, " + KEY_CONTENT1 + " text not null, " + KEY_CONTENT2 + " text not null);";

private SQLiteHelper sqLiteHelper;
private SQLiteDatabase sqLiteDatabase;

private Context context;

public DatabaseAdapter(Context c) {
    context = c;
}

public DatabaseAdapter openToRead() throws android.database.SQLException {
    sqLiteHelper = new SQLiteHelper(context, MYDATABASE_NAME, null,MYDATABASE_VERSION);
    sqLiteDatabase = sqLiteHelper.getReadableDatabase();
    return this;
}

public DatabaseAdapter openToWrite() throws android.database.SQLException {
    sqLiteHelper = new SQLiteHelper(context, MYDATABASE_NAME, null,MYDATABASE_VERSION);
    sqLiteDatabase = sqLiteHelper.getWritableDatabase();
    return this;
}

public void close() {
    sqLiteHelper.close();
}

public long insert(String name, String time) {

    ContentValues contentValues = new ContentValues();
    contentValues.put(KEY_CONTENT1, name);
    contentValues.put(KEY_CONTENT2, time);
    return sqLiteDatabase.insert(MYDATABASE_TABLE, null, contentValues);
}

public int deleteAll() {
    return sqLiteDatabase.delete(MYDATABASE_TABLE, null, null);
}

public Cursor queueAll() {
    String[] columns = new String[] { KEY_ID, KEY_CONTENT1, KEY_CONTENT2 };
    Cursor cursor = sqLiteDatabase.query(MYDATABASE_TABLE, columns, null,null, null, null, null);
    return cursor;
}

public class SQLiteHelper extends SQLiteOpenHelper {

    public SQLiteHelper(Context context, String name,
            CursorFactory factory, int version) {
        super(context, name, factory, version);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL(SCRIPT_CREATE_DATABASE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
    }
}

}

请帮帮我。

Answer 1

尝试将listview ID用作

 <Listview
  android:id="@android:id/list"
  ./>

也可以使用

      listcontent=getListView();

而不是

    listContent = (ListView) findViewById(R.id.contentlist);

Answer 2

您应该在布局文件中定义一个列表视图

android：id =“@ + id / contentlist”... /＆gt;

或者你必须使用android.R.id.list

访问android listview

强制关闭Android无法启动活动

2 个答案: