我总共有 9 个活动，我想使用向上导航按钮。我使用了 2 个父活动，即一个用于登录活动，另一个用于选项活动。请看代码。
它适用于：ResetActivity -> Loginactivity；忘记密码活动 -> 登录活动
其余的都不起作用请帮助我解决问题。
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".LoginActivity"
android:label=" Login"
android:launchMode="singleTop" >
</activity>
<activity
android:name=".RegisterActivity"
android:label="Register"
android:parentActivityName=".LoginActivity" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value=".LoginActivity" />
</activity>
<activity
android:name=".ForgotPasswordActivity"
android:label="Forgot password"
android:parentActivityName=".LoginActivity" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value=".LoginActivity" />
</activity>
<activity
android:name=".ResetActivity"
android:label="Reseting password"
android:parentActivityName=".LoginActivity" >
</activity>
<activity
android:name=".OptionActivity"
android:label="Option details"
android:launchMode="singleTop" >
</activity>
<activity
android:name=".ProductActivity"
android:label="Add Product"
android:parentActivityName=".OptionActivity" >
</activity>
<activity
android:name=".MapsActivity"
android:label=":location"
android:parentActivityName=".OptionActivity" >
</activity>
<activity
android:name=".HelpActivity"
android:label="How to use App"
android:parentActivityName=".OptionActivity" >
</activity>
<activity
android:name=".ViewActivity"
android:label="View"
android:parentActivityName=".OptionActivity" >
</activity>
我的登录活动代码：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
getActionBar().setDisplayHomeAsUpEnabled(true);
Button btnLinkToRegister = (Button) findViewById(R.id.btnlinkregister);
Button btnToForgot = (Button) findViewById(R.id.btnforgot);
Button signIn = (Button) findViewById(R.id.signin);
inputUsername = (EditText) findViewById(R.id.name);
inputPassword = (EditText) findViewById(R.id.password);
// Progress dialog
pDialog = new ProgressDialog(this);
pDialog.setCancelable(false);
// SqLite database handler
db = new UserData(getApplicationContext());
btnLinkToRegister.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(LoginActivity.this,
RegisterActivity.class);
startActivity(i);
finish();
}
});
btnToForgot.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent forgot = new Intent(LoginActivity.this,
ForgotPasswordActivity.class);
startActivity(forgot);
}
});
// Login button Click Event
signIn.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
String name = inputUsername.getText().toString();
String password = inputPassword.getText().toString();
if(name.equals("")&&password.equals("")) {
Toast.makeText(getApplicationContext(), "Username or Password is empty",
Toast.LENGTH_LONG).show();
return;
}
try {
if (name.length() > 0 && password.length() > 0) {
db = new UserData(LoginActivity.this); //create again database to retrive
if( db.Login(name, password)){
Toast.makeText(getApplicationContext(), "Login is Successful", Toast.LENGTH_LONG).show();
Intent work = new Intent(LoginActivity.this,
OptionActivity.class);
// work.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//work.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(work);
finish();
} else {
Toast.makeText(getApplicationContext(), "Invalid Username/Password", Toast.LENGTH_LONG).show();
}
}
} catch (Exception e) {
Toast.makeText(LoginActivity.this, "Problem occurred",
Toast.LENGTH_LONG).show();
}
}
});}
private void showDialog() {
if (!pDialog.isShowing())
pDialog.show();
}
private void hideDialog() {
if (pDialog.isShowing())
pDialog.dismiss();
}
@Override
public void onBackPressed() {
super.onBackPressed();
}
}
我的注册活动代码：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
inputUsername = (EditText) findViewById(R.id.name);
inputPassword = (EditText) findViewById(R.id.password);
inputEmail = (EditText) findViewById(R.id.email);
register = (Button) findViewById(R.id.btnRegister);
btnLinkToLogin = (Button) findViewById(R.id.btnLinkToLoginScreen);
ActionBar ab = getActionBar();
ab.setDisplayHomeAsUpEnabled(true);
// Progress dialog
pDialog = new ProgressDialog(this);
pDialog.setCancelable(false);
// SQLite database handler
db = new UserData(getApplicationContext());
//When register button is click the database updated
register.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String name = inputUsername.getText().toString();
String password = inputPassword.getText().toString();
String email = inputEmail.getText().toString();
if (!name.isEmpty() && !email.isEmpty() && !password.isEmpty()) {
//inputUsername.setText("");
//inputPassword.setText("");
//inputEmail.setText("");
//registerUser(name, email, password);
db.addUser(name, email, password);
Toast.makeText(getBaseContext(), "Registration is successful", Toast.LENGTH_LONG).show();
Intent i1 = new Intent(getApplicationContext(),
LoginActivity.class);
startActivity(i1);
}else{
Toast.makeText(getApplicationContext(),
"Please enter your details!", Toast.LENGTH_LONG)
.show();
}
}
});
// Link to Login Screen
btnLinkToLogin.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(),
LoginActivity.class);
startActivity(i);
}
});
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()){
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
private void showDialog() {
if (!pDialog.isShowing())
pDialog.show();
}
private void hideDialog() {
if (pDialog.isShowing())
pDialog.dismiss();
}
@Override
public void onBackPressed() {
Intent reg = new Intent(RegisterActivity.this,
LoginActivity.class);
startActivity(reg);
finish();
}
}