启动画面 - 如何?
Splash Screen - how to?
我的启动画面有问题,因为应用程序启动后我首先看到 MainActivity,然后是启动画面,错误是什么?
public class MainActivity extends AppCompatActivity {
int time = 3000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent i = new Intent(MainActivity.this, Splash_screen.class);
startActivity(i);
finish();
}
}, time);
XML MainActivity 代码。
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
tools:context=".MainActivity">
<ImageButton
android:id="@+id/b10"
android:layout_width="166dp"
android:layout_height="166dp"
android:layout_marginTop="450dp"
android:layout_marginEnd="30dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/b9"
android:layout_width="166dp"
android:layout_height="166dp"
android:layout_marginStart="30dp"
android:layout_marginTop="450dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/b8"
android:layout_width="166dp"
android:layout_height="166dp"
android:layout_marginTop="250dp"
android:layout_marginEnd="30dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/b7"
android:layout_width="166dp"
android:layout_height="166dp"
android:layout_marginStart="30dp"
android:layout_marginTop="250dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/b"
android:layout_width="166dp"
android:layout_height="166dp"
android:layout_marginTop="50dp"
android:layout_marginEnd="30dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/b1"
android:layout_width="166dp"
android:layout_height="166dp"
android:layout_marginStart="30dp"
android:layout_marginTop="50dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
XML Splash_screen 的代码。
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"
tools:context=".Splash_screen">
<ImageView
android:id="@+id/imageView2"
android:layout_width="427dp"
android:layout_height="588dp"
app:srcCompat="@drawable/beb"
tools:layout_editor_absoluteX="-8dp"
tools:layout_editor_absoluteY="16dp" />
这些是 MainActivity 文件和 Splash_screen 的 xml 代码。
感谢您的帮助,我是 android studio 和 Stack Overflow
的新手
首先去清单并像那样更改 intent-filter
<activity android:name=".SPLASH">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MainActivity" >
</activity>
这里是你需要先启动程序才能启动启动画面 activity,而不是 splash.java
int time = 3000;
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent i = new Intent(Splash_screen.this, MainActivity.class);
startActivity(i);
finish();
}
}, time);
您是从 MainActivity
调用启动画面,因此创建 activity 并显示启动画面是正常的;你应该按照@moon 的回答,但是有点不对:
您必须编辑 AndroidManifest.xml
以使 Splash_creen
首先被调用(确保 Splash_screen
是 Activity
):
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="your.pack.age"
android:installLocation="preferExternal" >
<!-- Your permissions -->
<application
android:allowBackup="true"
android:icon="@drawable/app_image" <!-- You'll have to modify these 3 lines -->
android:label="@string/app_name"
android:roundIcon="@drawable/app_round_image"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".Splash_screen">
<intent-filter>
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.pitibi.boulas.MainActivity"/>
</application>
</manifest>
然后你从 Splash_screen
的 OnCreate
调用 MainActivity
:
public class Splash_screen extends AppCompatActivity {
int time = 3000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_splash_layout);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent i = new Intent(Splash_screen.this, MainActivity.class);
startActivity(i);
finish();
}
}, time);
我的启动画面有问题,因为应用程序启动后我首先看到 MainActivity,然后是启动画面,错误是什么?
public class MainActivity extends AppCompatActivity {
int time = 3000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent i = new Intent(MainActivity.this, Splash_screen.class);
startActivity(i);
finish();
}
}, time);
XML MainActivity 代码。
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
tools:context=".MainActivity">
<ImageButton
android:id="@+id/b10"
android:layout_width="166dp"
android:layout_height="166dp"
android:layout_marginTop="450dp"
android:layout_marginEnd="30dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/b9"
android:layout_width="166dp"
android:layout_height="166dp"
android:layout_marginStart="30dp"
android:layout_marginTop="450dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/b8"
android:layout_width="166dp"
android:layout_height="166dp"
android:layout_marginTop="250dp"
android:layout_marginEnd="30dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/b7"
android:layout_width="166dp"
android:layout_height="166dp"
android:layout_marginStart="30dp"
android:layout_marginTop="250dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/b"
android:layout_width="166dp"
android:layout_height="166dp"
android:layout_marginTop="50dp"
android:layout_marginEnd="30dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/b1"
android:layout_width="166dp"
android:layout_height="166dp"
android:layout_marginStart="30dp"
android:layout_marginTop="50dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
XML Splash_screen 的代码。
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"
tools:context=".Splash_screen">
<ImageView
android:id="@+id/imageView2"
android:layout_width="427dp"
android:layout_height="588dp"
app:srcCompat="@drawable/beb"
tools:layout_editor_absoluteX="-8dp"
tools:layout_editor_absoluteY="16dp" />
这些是 MainActivity 文件和 Splash_screen 的 xml 代码。 感谢您的帮助,我是 android studio 和 Stack Overflow
的新手首先去清单并像那样更改 intent-filter
<activity android:name=".SPLASH">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MainActivity" >
</activity>
这里是你需要先启动程序才能启动启动画面 activity,而不是 splash.java
int time = 3000;
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent i = new Intent(Splash_screen.this, MainActivity.class);
startActivity(i);
finish();
}
}, time);
您是从 MainActivity
调用启动画面,因此创建 activity 并显示启动画面是正常的;你应该按照@moon 的回答,但是有点不对:
您必须编辑 AndroidManifest.xml
以使 Splash_creen
首先被调用(确保 Splash_screen
是 Activity
):
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="your.pack.age"
android:installLocation="preferExternal" >
<!-- Your permissions -->
<application
android:allowBackup="true"
android:icon="@drawable/app_image" <!-- You'll have to modify these 3 lines -->
android:label="@string/app_name"
android:roundIcon="@drawable/app_round_image"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".Splash_screen">
<intent-filter>
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.pitibi.boulas.MainActivity"/>
</application>
</manifest>
然后你从 Splash_screen
的 OnCreate
调用 MainActivity
:
public class Splash_screen extends AppCompatActivity {
int time = 3000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_splash_layout);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent i = new Intent(Splash_screen.this, MainActivity.class);
startActivity(i);
finish();
}
}, time);