java从主activite按意图启动ListActivity并查找错误您是否在AndroidManifest中声明了此活动。xml

Question

代码

 public class Season extends ListActivity {
        private DataBaseHelper db;
        private String[] Name;
        private String[] Teedad;
        private ListView listView;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.season);
                db = new DataBaseHelper(this);

                refresher();
                setListAdapter(new AA());
            listView=(ListView)findViewById(R.id.list);

                }
        class AA extends ArrayAdapter<String>{

            public AA(){
                super(Season.this,R.layout.raw_season,Name);

            }
            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                LayoutInflater in = getLayoutInflater();
                View row = in.inflate(R.layout.raw_season, parent,false);

                TextView name = (TextView) row.findViewById(R.id.name_season);
                TextView teedad = (TextView) row.findViewById(R.id.teedad_dastan);

                name.setText(Name [position]);
                teedad.setText(Teedad [position]);
                return (row);
            }
}
       } 
    private void refresher(){
        db.openDataBase();
        int save = db.shomaresh_field("datastorys", "season");
        Name = new String[save];
        Teedad = new String[save];
        for (int i = 0; i <save; i++) {
            Name[i] = db.namayesh_fasl("datastorys", i);
            Teedad[i] = db.shomaresh_dastan("datastorys", Name[i].toString())+"";
        }
        db.close();
    }
}

舱单

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
        package="com.example.farhad.bookdb">

        <application
            安卓:allowBackup="true"
            安卓:icon="@mipmap/ic_launcher"
            安卓:label="@string/app_name"
            安卓:supportsRtl="true"
            安卓:theme="@style/AppTheme">
            <activity 安卓:name="com.example.farhad.bookdb.MainActivity">
                <intent-filter>
                    <action 安卓:name="安卓.intent.action.MAIN" />
                    <category 安卓:name="安卓.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
            <activity
                安卓:name="com.example.farhad.bookdb.Season">#I think, Is there any problem?#
            </activity>
        </application>
    </manifest>

Xml

    <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
        安卓:layout_width="match_parent"
        安卓:layout_height="match_parent">
        <ListView
            安卓:layout_width="match_parent"
            安卓:layout_height="match_parent"
            安卓:layout_weight="1"
            安卓:drawSelectorOnTop="false"
            安卓:id="@+id/list" />#I define here list#
    </RelativeLayout>

主活动代码

    public class MainActivity extends Activity {

        Button btn;
        Cursor c = null;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            btn = (Button)findViewById(R.id.btn);
            btn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    DataBaseHelper myDbHelper = new DataBaseHelper(MainActivity.this);
                    try {
                        myDbHelper.createDataBase();
                    } catch (IOException ioe) {
                        throw new Error("Unable to create database");
                    }
                    try {
                        myDbHelper.openDataBase();
                        Intent intent = new     Intent(MainActivity.this,Season.class);
                        startActivity(intent);

                    } catch (SQLException sqle) {
                        throw sqle;
                    }
                }
            });
        }
    }

1. [1]： FATAL ERROR : main have you declared this activity in your AndroidManifest.xml?

   FATAL ERROR : main have you declared this activity in your AndroidManifest.xml?

   Android Studio: Unable to find explicit activity class have you declared this activity in your AndroidManifest.xml

Blockquote I have work two days on this application but there is a problem which make confuse. I have read most post about it but I could not solve it please help me.

Answer 1

试试这个

 <activity
            android:name=".Season"/>

而不是

 <activity
            android:name="com.example.farhad.bookdb.Season"/>

这可能对你有帮助

Answer 2

在使用ListActivity创建Listview时，必须有两件事包含一个将android:id属性设置为@android:id/list（非android:id=“@+id/list”）的Listview

如果在定义ListView时将android:id属性设置为@+id/list，则会出现错误