我是Android应用开发的新手。我有一个问题。 在第一个活动中，我创建了10行。每行包含一个链接到第二个活动的下一个按钮。 在第二个活动中，我有edittext字段输入用户详细信息，如帐户名，密码等。每次我更新我的帐户名称，当我按下android后退按钮时，该行应包含更新的名称。但我无法将帐户名称传递给第一个活动。
以下是我的第一项活动代码：
public class AccountSetup extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.account_main);
this.initViews();
}
private void initViews(){
TextView user1 = (TextView)findViewById(R.id.user1);
Button iconNext1 = (Button)findViewById(R.id.iconNext1);
iconNext1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent Intent1 = new Intent(AccountSetup.this, AccountSettingActivity1.class);
Intent1.putExtra("rowid","1");
startActivityForResult(Intent1, 100);
}
});
Button iconNext2 = (Button)findViewById(R.id.iconNext2);
iconNext2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent Intent2 = new Intent(AccountSetup.this, AccountSettingActivity2.class);
startActivity(Intent2);
finish();
}
});
Button iconNext3 = (Button)findViewById(R.id.iconNext3);
iconNext3.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent Intent3 = new Intent(AccountSetup.this, AccountSettingActivity3.class);
//onNewIntent((Intent) v.getTag());
Intent3.putExtra("rowid","3");
startActivity(Intent3);
finish();
}
});
Button iconNext4 = (Button)findViewById(R.id.iconNext4);
iconNext4.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent Intent4 = new Intent(AccountSetup.this, AccountSettingActivity4.class);
//onNewIntent((Intent) v.getTag());
Intent4.putExtra("rowid","4");
startActivity(Intent4);
finish();
}
});
Button iconNext5 = (Button)findViewById(R.id.iconNext5);
iconNext5.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent Intent5 = new Intent(AccountSetup.this, AccountSettingActivity5.class);
//onNewIntent((Intent) v.getTag());
Intent5.putExtra("rowid","5");
startActivity(Intent5);
finish();
}
});
Button iconNext6 = (Button)findViewById(R.id.iconNext6);
iconNext6.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent Intent6 = new Intent(AccountSetup.this, AccountSettingActivity6.class);
//onNewIntent((Intent) v.getTag());
Intent6.putExtra("rowid","6");
startActivity(Intent6);
finish();
}
});
Button iconNext7 = (Button)findViewById(R.id.iconNext7);
iconNext7.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent Intent7 = new Intent(AccountSetup.this, AccountSettingActivity7.class);
//onNewIntent((Intent) v.getTag());
Intent7.putExtra("rowid","7");
startActivity(Intent7);
finish();
}
});
Button iconNext8 = (Button)findViewById(R.id.iconNext8);
iconNext8.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent Intent8 = new Intent(AccountSetup.this, AccountSettingActivity8.class);
//onNewIntent((Intent) v.getTag());
Intent8.putExtra("rowid","8");
startActivity(Intent8);
finish();
}
});
Button iconNext9 = (Button)findViewById(R.id.iconNext9);
iconNext9.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent Intent9 = new Intent(AccountSetup.this, AccountSettingActivity9.class);
//onNewIntent((Intent) v.getTag());
Intent9.putExtra("rowid","9");
startActivity(Intent9);
finish();
}
});
Button iconNext10 = (Button)findViewById(R.id.iconNext10);
iconNext10.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent Intent10 = new Intent(AccountSetup.this, AccountSettingActivity10.class);
//onNewIntent((Intent) v.getTag());
Intent10.putExtra("rowid","10");
startActivity(Intent10);
finish();
}
});
}
@Override
public void onBackPressed() {
Intent i = new Intent(AccountSetup.this, WelcomeActivity.class);
startActivity(i);
finish();
super.onBackPressed();
}
@Override
protected void onActivityResult(int requestCode,int resultCode, Intent data) {
if (requestCode == 100) {
if (resultCode == RESULT_OK) {
String accountName1 = data.getStringExtra("accountName1");
}
}
}
}
以下是第二项活动的代码。
public class AccountSettingActivity1 extends Activity{
private EditText etAccountName;
private EditText etWanIp;
private EditText etLocalIp;
private EditText etPort;
private EditText etPassword;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.account_tab_content_setting);
this.initViews();
}
private void initViews(){
etAccountName = (EditText)this.findViewById(R.id.etAccountName);
etWanIp = (EditText)this.findViewById(R.id.etWanIp);
etLocalIp = (EditText)this.findViewById(R.id.etLocalIp);
etPort = (EditText)this.findViewById(R.id.etPort);
etPassword = (EditText)this.findViewById(R.id.etPassword);
// Assigns value
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
etAccountName.setText(sp.getString("accountName1", ""));
etWanIp.setText(sp.getString("wanIp1", ""));
etLocalIp.setText(sp.getString("localIp1", ""));
etPort.setText(sp.getString("port1", ""));
etPassword.setText(sp.getString("password1", ""));
etWanIp.setOnFocusChangeListener(new OnFocusChangeListener(){
@Override
public void onFocusChange(View arg0, boolean hasFocus) {
if(!hasFocus){
System.out.println("lost focus");
AccountSettingActivity1.this.saveSettings();
}
}
});
}
private void saveSettings(){
String accountName1 = etAccountName.getText().toString();
String wanIp1 = etWanIp.getText().toString();
String localIp1 = etLocalIp.getText().toString();
String port1 = etPort.getText().toString();
String password1 = etPassword.getText().toString();
accountName1 = (accountName1.trim().length() == 0)? "User": accountName1;
wanIp1 = (wanIp1.trim().length() == 0)? "0.0.0.0": wanIp1;
localIp1 = (localIp1.trim().length() == 0)? "0.0.0.0": localIp1;
port1 = (port1.trim().length() == 0)? "8000": port1;
password1 = (password1.trim().length() == 0)? "xxxx": password1;
etAccountName.setText(accountName1);
etWanIp.setText(wanIp1);
etLocalIp.setText(localIp1);
etPort.setText(port1);
etPassword.setText(password1);
SharedPreferences.Editor editor = PreferenceManager
.getDefaultSharedPreferences(this).edit();
editor.putString("accountName1", etAccountName.getText().toString());
editor.putString("wanIp1", etWanIp.getText().toString());
editor.putString("localIp1", etLocalIp.getText().toString());
editor.putString("port1", etPort.getText().toString());
editor.putString("password1", etPassword.getText().toString());
editor.commit();
}
/* @Override
public void onBackPressed() {
saveSettings();
Intent i = new Intent(AccountSettingActivity1.this, AccountSetup.class);
startActivity(i);
finish();
super.onBackPressed();
}*/
public void onBackPressed() {
saveSettings();
//final EditText Eclass1;
EditText et = (EditText)findViewById(R.id.etAccountName);
String s= et.getText().toString();
Intent i = new Intent(AccountSettingActivity1.this, AccountSetup.class);
i.putExtra("accountName1" ,s);
setResult(RESULT_OK, i);
finish();
super.onBackPressed();
}
@Override
protected void onPause() {
// When user leaves this tab, saves the values
this.saveSettings();
super.onPause();
}
}
第一个活动xml代码：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:AccountSetup="http://schemas.android.com/apk/res/com.example.play"
android:id="@+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<!-- Account Toolbar -->
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#324F85" >
<Button
android:layout_width="54dp"
android:layout_height="30dp"
android:layout_alignParentLeft="true"
android:background="@drawable/ic_btn_done"
android:layout_centerVertical="true"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/selectAccount"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textSize="15dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:gravity="center"
android:textStyle="bold" />
<Button
android:id="@+id/btnAdd"
android:layout_width="54dp"
android:layout_height="30dp"
android:layout_alignParentRight="true"
android:background="@drawable/ic_btn_add_account"
android:layout_centerVertical="true" />
<ImageView
android:layout_width="4dp"
android:layout_height="30dp"
android:layout_alignTop="@+id/btnDone"
android:layout_toRightOf="@+id/btnDone"
android:src="@drawable/toolbar_seperator" />
<ImageView
android:layout_width="4dp"
android:layout_height="30dp"
android:layout_alignTop="@+id/btnAdd"
android:layout_toLeftOf="@+id/btnAdd"
android:src="@drawable/toolbar_seperator" />
</RelativeLayout>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:background="@drawable/logo_small_white" >
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TableLayout
android:id="@+id/tlStatus"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:stretchColumns="1" >
<TableRow
style="@style/tableRow"
android:id="@+id/row1"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_weight="1"
android:gravity="center_vertical" >
<TextView
android:id="@+id/user1"
style="@style/textSettingLabel"
android:layout_weight="1" />
<Button
android:id="@+id/iconNext1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:layout_weight="1"
android:background="@drawable/icon_next" />
</TableRow>
<View style="@style/tableRowBorder" />
<TableRow
style="@style/tableRow"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_weight="1"
android:gravity="center_vertical" >
<TextView
android:id="@+id/user2"
style="@style/textSettingLabel"
android:layout_weight="1" />
<Button
android:id="@+id/iconNext2"
android:layout_width="wrap_content"
android:layout_gravity="right"
android:layout_weight="1"
android:scaleType="fitEnd"
android:background="@drawable/icon_next" />
</TableRow>
<View style="@style/tableRowBorder" />
<TableRow
style="@style/tableRow"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_weight="1"
android:gravity="center_vertical" >
<TextView
android:id="@+id/user3"
style="@style/textSettingLabel"
android:layout_weight="1" />
<Button
android:id="@+id/iconNext3"
android:layout_width="wrap_content"
android:layout_gravity="right"
android:layout_weight="1"
android:scaleType="fitEnd"
android:background="@drawable/icon_next" />
</TableRow>
<View style="@style/tableRowBorder" />
<TableRow
style="@style/tableRow"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_weight="1"
android:gravity="center_vertical" >
<TextView
android:id="@+id/user4"
style="@style/textSettingLabel"
android:layout_weight="1" />
<Button
android:id="@+id/iconNext4"
android:layout_width="wrap_content"
android:layout_gravity="right"
android:layout_weight="1"
android:scaleType="fitEnd"
android:background="@drawable/icon_next" />
</TableRow>
<View style="@style/tableRowBorder" />
<TableRow
style="@style/tableRow"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_weight="1"
android:gravity="center_vertical" >
<TextView
style="@style/textSettingLabel"
android:id="@+id/user5"
android:layout_alignBaseline="@+id/etZone_1_1"
android:text="User 1" />
<Button
android:id="@+id/iconNext5"
android:layout_width="wrap_content"
android:layout_gravity="right"
android:layout_weight="1"
android:scaleType="fitEnd"
android:background="@drawable/icon_next" />
</TableRow>
<View style="@style/tableRowBorder" />
<TableRow
style="@style/tableRow"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_weight="1"
android:gravity="center_vertical" >
<TextView
style="@style/textSettingLabel"
android:id="@+id/user6"
android:layout_alignBaseline="@+id/etZone_1_1"
android:text="User 1" />
<Button
android:id="@+id/iconNext6"
android:layout_width="wrap_content"
android:layout_gravity="right"
android:layout_weight="1"
android:scaleType="fitEnd"
android:background="@drawable/icon_next" />
</TableRow>
<View style="@style/tableRowBorder" />
<TableRow
style="@style/tableRow"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_weight="1"
android:gravity="center_vertical" >
<TextView
style="@style/textSettingLabel"
android:id="@+id/user7"
android:layout_alignBaseline="@+id/etZone_1_1"
android:text="User 1" />
<Button
android:id="@+id/iconNext7"
android:layout_width="wrap_content"
android:layout_gravity="right"
android:layout_weight="1"
android:scaleType="fitEnd"
android:background="@drawable/icon_next" />
</TableRow>
<View style="@style/tableRowBorder" />
<TableRow
style="@style/tableRow"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_weight="1"
android:gravity="center_vertical" >
<TextView
style="@style/textSettingLabel"
android:id="@+id/user8"
android:layout_alignBaseline="@+id/etZone_1_1"
android:text="User 1" />
<Button
android:id="@+id/iconNext8"
android:layout_width="wrap_content"
android:layout_gravity="right"
android:layout_weight="1"
android:scaleType="fitEnd"
android:background="@drawable/icon_next" />
</TableRow>
<View style="@style/tableRowBorder" />
<TableRow
style="@style/tableRow"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_weight="1"
android:gravity="center_vertical" >
<TextView
style="@style/textSettingLabel"
android:id="@+id/user9"
android:layout_alignBaseline="@+id/etZone_1_1"
android:text="User 1" />
<Button
android:id="@+id/iconNext9"
android:layout_width="wrap_content"
android:layout_gravity="right"
android:layout_weight="1"
android:scaleType="fitEnd"
android:background="@drawable/icon_next" />
</TableRow>
<View style="@style/tableRowBorder" />
<TableRow
style="@style/tableRow"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_weight="1"
android:gravity="center_vertical" >
<TextView
style="@style/textSettingLabel"
android:id="@+id/user10"
android:layout_alignBaseline="@+id/etZone_1_1"
android:text="User 1" />
<Button
android:id="@+id/iconNext10"
android:layout_width="wrap_content"
android:layout_gravity="right"
android:layout_weight="1"
android:scaleType="fitEnd"
android:background="@drawable/icon_next" />
</TableRow>
<View style="@style/tableRowBorder" />
</TableLayout>
</ScrollView>
</RelativeLayout>
</LinearLayout>
第二个活动的xml代码：
<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ToolBar="http://schemas.android.com/apk/res/com.example.play"
xmlns:TextViewMyRiadPro="http://schemas.android.com/apk/res/com.example.play"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<ViewSwitcher
android:id="@+id/switcher"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ScrollView
android:id="@+id/settingsView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/logo_small_white" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="565dp"
android:padding="15dp" >
<TextView
android:id="@+id/tvAccount"
android:text="Name"
android:layout_alignBaseline="@+id/etAccountName"
style="@style/textSettingLabel" />
<EditText
android:id="@+id/etAccountName"
style="@style/textSettingEdit"
android:layout_alignLeft="@+id/etWanIp"
android:inputType="text" />
<TextView
android:id="@+id/tvAccount"
android:layout_below="@+id/etAccountName"
android:text="User Account Name"
style="@style/textSettingHint" />
<TextView
android:id="@+id/tvWan"
android:text="Wan IP"
android:layout_alignBaseline="@+id/etWanIp"
style="@style/textSettingLabel" />
<EditText
android:id="@+id/etWanIp"
android:layout_below="@+id/tvAccount"
android:layout_toRightOf="@+id/tvWan"
style="@style/textSettingEdit" android:inputType="text"/>
<TextView
android:id="@+id/tvWanHint"
android:layout_below="@+id/etWanIp"
android:text="Port forwarding is required in order to establish connection from the internet"
style="@style/textSettingHint" />
<TextView
android:id="@+id/tvLocal"
android:text="Local IP"
android:layout_alignBaseline="@+id/etLocalIp"
style="@style/textSettingLabel" />
<EditText
android:id="@+id/etLocalIp"
android:layout_below="@+id/tvWanHint"
android:layout_toRightOf="@+id/tvLocal"
style="@style/textSettingEdit" android:inputType="text"/>
<TextView
android:id="@+id/tvLocalHint"
android:layout_below="@+id/etLocalIp"
android:text="The IP address of the alarm system in the local area network. 192.168.1.234 is the default address."
style="@style/textSettingHint" />
<TextView
android:id="@+id/tvPort"
android:text="Port"
android:layout_alignBaseline="@+id/etPort"
style="@style/textSettingLabel" />
<EditText
android:id="@+id/etPort"
android:layout_below="@+id/tvLocalHint"
android:layout_toRightOf="@+id/tvPort"
android:inputType="number"
style="@style/textSettingEdit" />
<TextView
android:id="@+id/tvPortHint"
android:layout_below="@+id/etPort"
android:text="The connection port of the alarm system. 8000 is the default port."
style="@style/textSettingHint" />
<TextView
android:id="@+id/tvPassword"
android:text="Password"
android:layout_alignBaseline="@+id/etPassword"
style="@style/textSettingLabel" />
<EditText
android:id="@+id/etPassword"
android:layout_below="@+id/tvPortHint"
android:layout_toRightOf="@+id/tvPassword"
style="@style/textSettingEdit" android:inputType="textPassword"/>
<TextView
android:layout_below="@+id/etPassword"
android:id="@+id/tvPasswordHint"
android:text="Your 4 digits password to access the alarm system."
style="@style/textSettingHint" />
</RelativeLayout>
</ScrollView>
</ViewSwitcher>
</LinearLayout>
答案 0 :(得分：1)
使用startActivityForResult（）开始第二个活动
startActivityForResult(intent, requestcode)
当第二个活动完成后，执行以下操作，意图可以保存您需要传递回activity1的值
setResult(RESULT_OK, intent)
finish();
现在在Activity1上，覆盖onActivityResult（）
onActivityResult()
{
//update your textview here.
}
答案 1 :(得分：0)
deepdroid的回答是正确的，但你有另外一种选择
设置public static String value=null;因此，它不依赖于整个活动。