[英]Checkbox should saved and retrieved after closing the app, i tried it with sharedpreferences but it doesnt work and i dont know why
[英]Android - I dont know why my intent doesnt work
所以,大家好,我是這里的新手,也是 android 的新手,但是自從我第一次在學校開始編程以來,我已經在 StackOverflow 上搜索了 3 年,目前我被這個問題困了 2 周,因為我打算開始一項活動是行不通的,我搜索了很多,看了幾個視頻,但我就是想不通,我在學校根本沒有學過 Android 這就是為什么我正在做一個項目,我真的很喜歡編程和學習。~
所以我的項目包括為 Android 上的應用程序構建一個數據庫(顯然)和一個我目前也在開發 WordPress 的網站,我的應用程序和網站是為餐館、咖啡館制作的,類似於比薩餅屋網站,但更好(如果我能做到,我會向你們展示)。 好吧,對不起,我只是想我需要介紹一下我的“工作”和我自己。
讓我們進入正題:
我有這張圖片向您展示了我的噩夢,它可能很容易解決。
protected void cl_login (View view)
{
txt_email.requestFocus();
if(txt_email.getText().toString().equals("") == false && txt_pw.getText().toString().equals("") == false ) {
Toast.makeText(this, "A entrar..", Toast.LENGTH_LONG).show();
Intent ploginconta = new Intent(this, login_conta.class);
startActivity(ploginconta);
}
else {
Toast.makeText(this, "Tem de preencher os campos para entrar na sua conta", Toast.LENGTH_LONG).show();
txt_pw.setText("");
txt_email.setText("");
}
}
protected void cl_semconta (View view)
{
Intent paginaregisto = new Intent(this, registar.class);
startActivity(paginaregisto);
}
protected void cl_esqueceupw (View view)
{
Intent paginaesqueceupw = new Intent(this, esqueceu_pw.class);
startActivity(paginaesqueceupw);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
txt_pw = findViewById(R.id.txt_pw);
txt_email = findViewById(R.id.txt_email);
bt_login = findViewById(R.id.bt_login);
}
布局 1
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorPrimary"
tools:context=".login">
<ImageView
android:id="@+id/img_linha3"
android:layout_width="399dp"
android:layout_height="8dp"
android:layout_marginTop="32dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.466"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/rtl_login"
app:srcCompat="@drawable/txt_view_linha" />
<TextView
android:id="@+id/rtl_pwesquecida"
android:layout_width="wrap_content"
android:layout_height="20dp"
android:layout_marginEnd="2dp"
android:layout_marginRight="2dp"
android:onClick="cl_esqueceupw"
android:text="@string/pwesquecida"
android:textColor="@android:color/holo_orange_light"
app:fontFamily="@font/allerta"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.508"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/rtl_ntemconta"
app:layout_constraintVertical_bias="0.095" />
<Button
android:id="@+id/bt_login"
android:layout_width="259dp"
android:layout_height="35dp"
android:layout_marginTop="48dp"
android:background="@drawable/botao_redondo"
android:onClick="cl_login"
android:text="LOGIN"
android:textColor="@color/colorPrimary"
android:textSize="16dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/txt_pw" />
<EditText
android:id="@+id/txt_email"
android:layout_width="259dp"
android:layout_height="39dp"
android:layout_marginTop="70dp"
android:drawableLeft="@drawable/ic_action_email"
android:ems="10"
android:hint="EMAIL"
android:inputType="textWebEmailAddress"
android:textColor="@android:color/holo_orange_light"
android:textColorHint="@android:color/holo_orange_light"
android:textSize="12sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.504"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/rtl_login" />
<EditText
android:id="@+id/txt_pw"
android:layout_width="259dp"
android:layout_height="39dp"
android:layout_marginTop="24dp"
android:drawableLeft="@drawable/ic_action_pw"
android:ems="10"
android:hint="PALAVRA-PASSE"
android:inputType="textPassword"
android:textColor="@android:color/holo_orange_light"
android:textColorHint="@android:color/holo_orange_light"
android:textSize="12sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.504"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/txt_email" />
<TextView
android:id="@+id/rtl_login"
android:layout_width="wrap_content"
android:layout_height="47dp"
android:layout_marginTop="36dp"
android:text="LOGIN"
android:textAllCaps="false"
android:textColor="@android:color/holo_orange_light"
android:textSize="30sp"
android:textStyle="bold"
app:fontFamily="@font/biryani_extralight"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.501"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/rtl_ntemconta"
android:layout_width="wrap_content"
android:layout_height="20dp"
android:layout_marginTop="20dp"
android:layout_marginBottom="8dp"
android:onClick="cl_semconta"
android:text="@string/naotemconta"
android:textColor="@android:color/holo_orange_light"
app:fontFamily="@font/allerta"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.503"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/bt_login"
app:layout_constraintVertical_bias="0.023" />
</android.support.constraint.ConstraintLayout>
以及我試圖開始的活動(我在這里只更改了一些代碼)
public class login_conta extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login_conta);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.login_conta, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_menu) {
} else if (id == R.id.nav_promocao) {
} else if (id == R.id.nav_takeaway) {
} else if (id == R.id.nav_domicilio) {
} else if (id == R.id.nav_definicoes) {
} else if (id == R.id.nav_facebook) {
} else if (id == R.id.nav_avaliacao) {
} else if (id == R.id.nav_contacte) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
布局 2
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<include
layout="@layout/app_bar_login_conta"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.design.widget.NavigationView
android:id="@+id/vw_conta"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_login_conta"
app:menu="@menu/activity_login_conta_drawer" />
</android.support.v4.widget.DrawerLayout>
我真的希望你們幫幫我,因為我找不到代碼上的錯誤或者我應該怎么做,因為我又是 Android Studio 的新手我正在通過搜索和嘗試來學習,請不要給我發火,謝謝。
我的安卓清單:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.aluno.pap">
<!-- To auto-complete the email text field in the login form with the user's emails -->
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_PROFILE" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".esqueceu_pw"></activity>
<activity android:name=".pap">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".login_conta"
android:label="@string/title_activity_login_conta"
android:theme="@style/AppTheme.NoActionBar" />
<activity android:name=".login" />
<activity android:name=".registar" />
<meta-data
android:name="preloaded_fonts"
android:resource="@array/preloaded_fonts" />
</application>
</manifest>
確保您的 AndroidManifest.xml 文件聲明了 login_conta 活動。 像這樣的東西。
<activity android:name=".login_conta" />
注意:為活動使用更好的命名。 例如,LoginActivity 和 LoginContaActivity。 (我不知道什么是 login_conta)。
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