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我一直在研究我的應用程序，並且到了需要了解活動生命週期的階段，我不認爲我明白了。我擁有的是一個帶有七個按鈕的活動。當用戶按下按鈕時，會打開一個listActivity，用戶可以在該列表中選擇列表中的項目，將標題發送回調用活動，並且調用活動將該標題旁邊的標題添加到按鈕上的文本中。 （它使用的方法在switch語句中，取決於請求代碼返回到哪個 - 我認爲這對我的目的有點弱）。但是，如果用戶離開活動並返回到它，請通過後退按鈕或任何其他按鈕，當他們返回時沒有任何額外的信息 - 所有剩下的都是帶有原始文本的七個按鈕。我希望信息留下 - 我該如何解決這個問題？Android onPause（）或saveInstanceState（）？
這裏是從主叫活動的代碼：
package com.dinner.live;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast;
public class PlanMenu extends Activity {
static final private int CHOOSE_MONDAY = 0;
static final private int CHOOSE_TUESDAY = 1;
static final private int CHOOSE_WEDNESDAY = 2;
static final private int CHOOSE_THURSDAY = 3;
static final private int CHOOSE_FRIDAY = 4;
static final private int CHOOSE_SATURDAY = 5;
static final private int CHOOSE_SUNDAY = 6;
private boolean ButtonPushed = false;
private NotesDbAdapter mDbHelper;
private MenuDbAdapter menuDbHelper;
private Long menuID;
private String mTitleText;
private String m;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.plan_menu);
Toast.makeText(this, "Choose a day to pick a meal for!", Toast.LENGTH_LONG).show();
mDbHelper = new NotesDbAdapter(this);
mDbHelper.open();
menuDbHelper = new MenuDbAdapter(this);
menuDbHelper.open();
}
public void mButtonHandler(View target)
{
switch(target.getId())
{
case R.id.monday:
if(ButtonPushed == false)
{
// Create new intent object and tell it to call the ColorPicker class
Intent monday = new Intent(this, PlanMenuList.class);
// Start ColorPicker as a new activity and wait for the result
startActivityForResult(monday, CHOOSE_MONDAY);
ButtonPushed = true;
break;
}
else
Toast.makeText(this, "That button has already been pushed." , Toast.LENGTH_LONG).show();
break;
case R.id.tuesday:
// Create new intent object and tell it to call the ColorPicker class
Intent tuesday = new Intent(this, PlanMenuList.class);
// Start ColorPicker as a new activity and wait for the result
startActivityForResult(tuesday, CHOOSE_TUESDAY);
break;
case R.id.wednesday:
// Create new intent object and tell it to call the ColorPicker class
Intent wednesday = new Intent(this, PlanMenuList.class);
// Start ColorPicker as a new activity and wait for the result
startActivityForResult(wednesday, CHOOSE_WEDNESDAY);
break;
case R.id.thursday:
// Create new intent object and tell it to call the ColorPicker class
Intent thursday = new Intent(this, PlanMenuList.class);
// Start ColorPicker as a new activity and wait for the result
startActivityForResult(thursday, CHOOSE_THURSDAY);
break;
case R.id.friday:
// Create new intent object and tell it to call the ColorPicker class
Intent friday = new Intent(this, PlanMenuList.class);
// Start ColorPicker as a new activity and wait for the result
startActivityForResult(friday, CHOOSE_FRIDAY);
break;
case R.id.saturday:
// Create new intent object and tell it to call the ColorPicker class
Intent saturday = new Intent(this, PlanMenuList.class);
// Start ColorPicker as a new activity and wait for the result
startActivityForResult(saturday, CHOOSE_SATURDAY);
break;
case R.id.sunday:
// Create new intent object and tell it to call the ColorPicker class
Intent sunday = new Intent(this, PlanMenuList.class);
// Start ColorPicker as a new activity and wait for the result
startActivityForResult(sunday, CHOOSE_SUNDAY);
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
if(resultCode == RESULT_OK){
switch(requestCode)
{
case CHOOSE_MONDAY:
menuID = intent.getExtras().getLong("newRowId");
menuDbHelper.fetchMenu(menuID);
populateFields();
//String label = intent.getExtras().getString("menuString");//intent.getExtras().getLong(MenuDbAdapter.KEY_ROWID);
Button tv = (Button)findViewById(R.id.monday);
m = mTitleText;
tv.setText("Monday" + " - " + mTitleText);
break;
case CHOOSE_TUESDAY:
String labelT = intent.getExtras().getString("menuString");//intent.getExtras().getLong(MenuDbAdapter.KEY_ROWID);
Button tvT = (Button)findViewById(R.id.tuesday);
tvT.setText("Tuesday" + " - " + labelT);
break;
case CHOOSE_WEDNESDAY:
String labelW = intent.getExtras().getString("menuString");//intent.getExtras().getLong(MenuDbAdapter.KEY_ROWID);
Button tvW = (Button)findViewById(R.id.wednesday);
tvW.setText("Wednesday" + " - " + labelW);
break;
case CHOOSE_THURSDAY:
String labelTh = intent.getExtras().getString("menuString");//intent.getExtras().getLong(MenuDbAdapter.KEY_ROWID);
Button tvTh = (Button)findViewById(R.id.thursday);
tvTh.setText("Thursday" + " - " + labelTh);
break;
case CHOOSE_FRIDAY:
String labelFriday = intent.getExtras().getString("menuString");//intent.getExtras().getLong(MenuDbAdapter.KEY_ROWID);
Button tvFriday = (Button)findViewById(R.id.friday);
tvFriday.setText("Friday" + " - " + labelFriday);
break;
case CHOOSE_SATURDAY:
String labelS = intent.getExtras().getString("menuString");//intent.getExtras().getLong(MenuDbAdapter.KEY_ROWID);
Button tvS = (Button)findViewById(R.id.saturday);
tvS.setText("Saturday" + " - " + labelS);
break;
case CHOOSE_SUNDAY:
String labelSa = intent.getExtras().getString("menuString");//intent.getExtras().getLong(MenuDbAdapter.KEY_ROWID);
Button tvSa = (Button)findViewById(R.id.sunday);
tvSa.setText("Sunday" + " - " + labelSa);
break;
}
}
}
private void populateFields() {
if (menuID != null) {
Cursor note = menuDbHelper.fetchMenu(menuID);
startManagingCursor(note);
mTitleText = (note.getString(
note.getColumnIndexOrThrow(MenuDbAdapter.KEY_TITLE)));
}
}
}
我對你的代碼進行了格式化，但它仍然是一團糟。把它清理一下，把它切成相關的部分，你會得到更好的迴應。 – 2010-09-05 21:27:01