More than one Activity : Activity « UI « Android

1. Android
2. UI
3. Activity

More than one Activity

     


package apt.tutorial;

import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.TextView;

public class DetailForm extends Activity {
  EditText name=null;
  EditText address=null;
  EditText notes=null;
  RadioGroup types=null;
  RestaurantHelper helper=null;
  String restaurantId=null;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.detail_form);

    helper=new RestaurantHelper(this);
    
    name=(EditText)findViewById(R.id.name);
    address=(EditText)findViewById(R.id.addr);
    notes=(EditText)findViewById(R.id.notes);
    types=(RadioGroup)findViewById(R.id.types);
    
    Button save=(Button)findViewById(R.id.save);
    
    save.setOnClickListener(onSave);
    
    restaurantId=getIntent().getStringExtra(LunchList.ID_EXTRA);
    
    if (restaurantId!=null) {
      load();
    }
  }
  
  @Override
  public void onDestroy() {
    super.onDestroy();
  
    helper.close();
  }
  
  private void load() {
    Cursor c=helper.getById(restaurantId);

    c.moveToFirst();    
    name.setText(helper.getName(c));
    address.setText(helper.getAddress(c));
    notes.setText(helper.getNotes(c));
    
    if (helper.getType(c).equals("sit_down")) {
      types.check(R.id.sit_down);
    }
    else if (helper.getType(c).equals("take_out")) {
      types.check(R.id.take_out);
    }
    else {
      types.check(R.id.delivery);
    }
    
    c.close();
  }
  
  private View.OnClickListener onSave=new View.OnClickListener() {
    public void onClick(View v) {
      String type=null;
      
      switch (types.getCheckedRadioButtonId()) {
        case R.id.sit_down:
          type="sit_down";
          break;
        case R.id.take_out:
          type="take_out";
          break;
        case R.id.delivery:
          type="delivery";
          break;
      }

      if (restaurantId==null) {
        helper.insert(name.getText().toString(),
                      address.getText().toString(), type,
                      notes.getText().toString());
      }
      else {
        helper.update(restaurantId, name.getText().toString(),
                      address.getText().toString(), type,
                      notes.getText().toString());
      }
      
      finish();
    }
  };
}



//12-Activities\LunchList\src\apt\tutorial\LunchList.java
package apt.tutorial;

import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.LayoutInflater;
import android.widget.AdapterView;
import android.widget.CursorAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class LunchList extends ListActivity {
  public final static String ID_EXTRA="apt.tutorial._ID";
  Cursor model=null;
  RestaurantAdapter adapter=null;
  RestaurantHelper helper=null;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    
    helper=new RestaurantHelper(this);
    model=helper.getAll();
    startManagingCursor(model);
    adapter=new RestaurantAdapter(model);
    setListAdapter(adapter);
  }
  
  @Override
  public void onDestroy() {
    super.onDestroy();
    
    helper.close();
  }
  
  @Override
  public void onListItemClick(ListView list, View view,
                              int position, long id) {
    Intent i=new Intent(LunchList.this, DetailForm.class);

    i.putExtra(ID_EXTRA, String.valueOf(id));
    startActivity(i);
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    new MenuInflater(this).inflate(R.menu.option, menu);

    return(super.onCreateOptionsMenu(menu));
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId()==R.id.add) {
      startActivity(new Intent(LunchList.this, DetailForm.class));
      
      return(true);
    }
    
    return(super.onOptionsItemSelected(item));
  }
  
  class RestaurantAdapter extends CursorAdapter {
    RestaurantAdapter(Cursor c) {
      super(LunchList.this, c);
    }
    
    @Override
    public void bindView(View row, Context ctxt,
                         Cursor c) {
      RestaurantHolder holder=(RestaurantHolder)row.getTag();
      
      holder.populateFrom(c, helper);
    }
    
    @Override
    public View newView(Context ctxt, Cursor c,
                         ViewGroup parent) {
      LayoutInflater inflater=getLayoutInflater();
      View row=inflater.inflate(R.layout.row, parent, false);
      RestaurantHolder holder=new RestaurantHolder(row);
      
      row.setTag(holder);
      
      return(row);
    }
  }
  
  static class RestaurantHolder {
    private TextView name=null;
    private TextView address=null;
    private ImageView icon=null;
    
    RestaurantHolder(View row) {
      name=(TextView)row.findViewById(R.id.title);
      address=(TextView)row.findViewById(R.id.address);
      icon=(ImageView)row.findViewById(R.id.icon);
    }
    
    void populateFrom(Cursor c, RestaurantHelper helper) {
      name.setText(helper.getName(c));
      address.setText(helper.getAddress(c));
  
      if (helper.getType(c).equals("sit_down")) {
        icon.setImageResource(R.drawable.ball_red);
      }
      else if (helper.getType(c).equals("take_out")) {
        icon.setImageResource(R.drawable.ball_yellow);
      }
      else {
        icon.setImageResource(R.drawable.ball_green);
      }
    }
  }
}


//12-Activities\LunchList\src\apt\tutorial\RestaurantHelper.java
package apt.tutorial;

import android.content.Context;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteQueryBuilder;

class RestaurantHelper extends SQLiteOpenHelper {
  private static final String DATABASE_NAME="lunchlist.db";
  private static final int SCHEMA_VERSION=1;
  
  public RestaurantHelper(Context context) {
    super(context, DATABASE_NAME, null, SCHEMA_VERSION);
  }
  
  @Override
  public void onCreate(SQLiteDatabase db) {
    db.execSQL("CREATE TABLE restaurants (_id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, address TEXT, type TEXT, notes TEXT);");
  }

  @Override
  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // no-op, since will not be called until 2nd schema
    // version exists
  }

  public Cursor getAll() {
    return(getReadableDatabase()
            .rawQuery("SELECT _id, name, address, type, notes FROM restaurants ORDER BY name",
                      null));
  }
  
  public Cursor getById(String id) {
    String[] args={id};

    return(getReadableDatabase()
            .rawQuery("SELECT _id, name, address, type, notes FROM restaurants WHERE _ID=?",
                      args));
  }
  
  public void insert(String name, String address,
                     String type, String notes) {
    ContentValues cv=new ContentValues();
          
    cv.put("name", name);
    cv.put("address", address);
    cv.put("type", type);
    cv.put("notes", notes);
    
    getWritableDatabase().insert("restaurants", "name", cv);
  }
  
  public void update(String id, String name, String address,
                     String type, String notes) {
    ContentValues cv=new ContentValues();
    String[] args={id};
    
    cv.put("name", name);
    cv.put("address", address);
    cv.put("type", type);
    cv.put("notes", notes);
    
    getWritableDatabase().update("restaurants", cv, "_ID=?",
                                 args);
  }
  
  public String getName(Cursor c) {
    return(c.getString(1));
  }
  
  public String getAddress(Cursor c) {
    return(c.getString(2));
  }
  
  public String getType(Cursor c) {
    return(c.getString(3));
  }
  
  public String getNotes(Cursor c) {
    return(c.getString(4));
  }
}


//12-Activities\LunchList\res\values\strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">LunchList</string>
</resources>



//12-Activities\LunchList\res\menu\option.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:id="@+id/add"
    android:title="Add"
    android:icon="@drawable/ic_menu_add"
  />
</menu>


//12-Activities\LunchList\res\layout\detail_form.xml
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:stretchColumns="1"
  >
  <TableRow>
    <TextView android:text="Name:" />
    <EditText android:id="@+id/name" />
  </TableRow>
  <TableRow>
    <TextView android:text="Address:" />
    <EditText android:id="@+id/addr" />
  </TableRow>
  <TableRow>
    <TextView android:text="Type:" />
    <RadioGroup android:id="@+id/types">
      <RadioButton android:id="@+id/take_out"
        android:text="Take-Out"
      />
      <RadioButton android:id="@+id/sit_down"
        android:text="Sit-Down"
      />
      <RadioButton android:id="@+id/delivery"
        android:text="Delivery"
      />
    </RadioGroup>
  </TableRow>
  <TableRow>
    <TextView android:text="Notes:" />
    <EditText android:id="@+id/notes"
      android:singleLine="false"
      android:gravity="top"
      android:lines="2"
      android:scrollHorizontally="false"
      android:maxLines="2"
      android:maxWidth="200sp"
    />
  </TableRow>
  <Button android:id="@+id/save"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Save"
  />
</TableLayout>



//12-Activities\LunchList\res\layout\main.xml
<?xml version="1.0" encoding="utf-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@android:id/list"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
/>

//12-Activities\LunchList\res\layout\row.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:orientation="horizontal"
  android:padding="4dip"
  >
  <ImageView android:id="@+id/icon"
    android:layout_width="wrap_content"
    android:layout_height="fill_parent"
    android:layout_alignParentTop="true"
    android:layout_alignParentBottom="true"
    android:layout_marginRight="4dip"
  />
  <LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >  
    <TextView android:id="@+id/title"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:layout_weight="1"
      android:gravity="center_vertical"
      android:textStyle="bold"
      android:singleLine="true"
      android:ellipsize="end"
    />
    <TextView android:id="@+id/address"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:layout_weight="1"
      android:gravity="center_vertical"
      android:singleLine="true"
      android:ellipsize="end"
    />
  </LinearLayout>
</LinearLayout>

   
    
    
    
    
  

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