Java 当我打开一个活动时,Android应用程序崩溃,但是eclipse没有显示错误
我正在尝试做一个导航抽屉布局。这是我的AddActivity.java:Java 当我打开一个活动时,Android应用程序崩溃,但是eclipse没有显示错误,java,android,eclipse,Java,Android,Eclipse,我正在尝试做一个导航抽屉布局。这是我的AddActivity.java: package de.hoffmann.pod2go; import android.app.Activity; import android.content.res.Configuration; import android.os.Bundle; import android.support.v4.app.ActionBarDrawerToggle; import android.support.v4.app.NavU
package de.hoffmann.pod2go;
import android.app.Activity;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.app.NavUtils;
import android.support.v4.widget.DrawerLayout;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
public class AddActivity extends Activity {
public ActionBarDrawerToggle mDrawerToggle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add);
// Show the Up button in the action bar.
DrawerLayout mDrawerLayout = (DrawerLayout) findViewById(R.id.left_drawer);
ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle(
this, /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.ic_drawer, /* nav drawer icon to replace 'Up' caret */
R.string.drawer_open, /* "open drawer" description */
R.string.drawer_close /* "close drawer" description */
) {
/** Called when a drawer has settled in a completely closed state. */
public void onDrawerClosed(View view) {
getActionBar().setTitle(R.string.title_activity_add);
}
/** Called when a drawer has settled in a completely open state. */
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(R.string.drawer_title);
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
getActionBar().setDisplayHomeAsUpEnabled(true); // Pressing the app icon in the action bar will navigate to the parent activity.
getActionBar().setHomeButtonEnabled(true);
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Pass the event to ActionBarDrawerToggle, if it returns
// true, then it has handled the app icon touch event
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
switch (item.getItemId())
{
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.add, menu);
return true;
}
}
下面是LogCat在我尝试打开活动时所说的:
java.lang.ClassCastException:android.widget.ListView无法强制转换为android.support.v4.widget.DrawerLayout
我做错了什么?您确定R.id.left\u抽屉是抽屉布局,而不是列表视图吗?
R.id.left\u抽屉
必须表示列表视图。您是否尝试清理项目并重新运行?Eclipse有时会为所有id创建混乱。ActionBarDrawerToggle的构造函数仅处理抽屉布局,当使用列表视图时,会出现以下错误:构造函数ActionBarDrawerToggle(AddActivity,ListView,int,int,int)未定义。您可以在这里找到my AddActivity.xml:构造函数的第二个参数是指drawer\u布局(外部xml元素)还是left\u drawer(仅用于导航抽屉中的内容的xml元素)?编辑:当我将第二个参数更改为外部元素(drawer\u layout)时,logcatisgivingmeadifferention错误:your layout.xml请@我想我没有layout.xml文件!什么意思?