我想让我的应用看起来更专业，所以我决定添加一个启动画面。
我应该如何进行实现呢?
当前回答
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Thread t=new Thread()
{
public void run()
{
try {
sleep(2000);
finish();
Intent cv=new Intent(MainActivity.this,HomeScreen.class/*otherclass*/);
startActivity(cv);
}
catch (InterruptedException e) {
e.printStackTrace();
}
}
};
t.start();
}
其他回答
启动画面示例:
public class MainActivity extends Activity {
private ImageView splashImageView;
boolean splashloading = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
splashImageView = new ImageView(this);
splashImageView.setScaleType(ScaleType.FIT_XY);
splashImageView.setImageResource(R.drawable.ic_launcher);
setContentView(splashImageView);
splashloading = true;
Handler h = new Handler();
h.postDelayed(new Runnable() {
public void run() {
splashloading = false;
setContentView(R.layout.activity_main);
}
}, 3000);
}
}
虽然有很好的答案，但我将展示谷歌推荐的方法:
1)首先为启动画面创建一个主题: 你有一个名为splashscreenTheme的主题，你的启动器主题将是:
<style name="splashscreenTheme">
<item name="android:windowBackground">@drawable/launch_screen</item>
</style>
注意:
android:windowBackground已经设置了你的溅屏图像编号 需要在UI中再次这样做。
你也可以在这里使用颜色来代替绘图。
2)设置主题为splashscreenActivity的manifest
<activity
android:name=".activity.splashscreenActivity"
android:screenOrientation="portrait"
android:theme="@style/splashscreenTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
3)确保你的launch_screen drawable不在drawable文件夹如果你的图像不小。
这将导致更快的启动屏幕启动和拯救你从黑屏
这也避免了额外的透支
- Add in SplashActivity
public class SplashActivity extends Activity {
private ProgressBar progressBar;
int i=0;
Context context;
private GoogleApiClient googleApiClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
context = this;
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
startActivity(new Intent(Splash.this, LoginActivity.class));
finish();
}
}, 2000);
}
}
- Add in activity_splash.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:custom="http://schemas.android.com/apk/res-auto"
android:background="@color/colorAccent"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Splash">
<ImageView
android:id="@+id/ivLogo"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@mipmap/icon_splash"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"/>
<ProgressBar
android:id="@+id/circle_progress"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="5dp"
android:max="100"
android:progressTint="@color/green"
android:visibility="visible" />
</RelativeLayout>
- Add in AndroidManifest.xml
<activity android:name="ex.com.SplashActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
这是我所见过的关于启动画面的最好的帖子:http://saulmm.github.io/avoding-android-cold-starts
Saúl Molinero介绍了两种不同的启动画面选项:利用窗口背景动画进入初始屏幕和显示占位符UI(这是谷歌目前在大多数应用程序中使用的流行选择)。
每当我需要考虑冷启动时间和避免由于长启动时间而导致用户流失时，我都会参考这篇文章。
希望这能有所帮助!
在Android Marshmallow之后，我想到的另一个有效使用启动画面的方法是在应用的启动画面中请求必要的Android权限。
似乎大多数应用程序都是这样处理权限请求的。
对话框是糟糕的ui，它们破坏了主要流程，让你决定运行时间，事实上，大多数用户甚至可能不在乎你的应用程序是否想在SD卡上写东西。他们中的一些人甚至不明白我们试图传达什么，直到我们用简单的英语翻译出来。 一次请求权限可以减少每次操作前的“if else”次数，使代码看起来不那么杂乱。
这是一个例子，你可以在你的splash活动中请求运行Android OS 23+的设备的权限。
如果所有权限都被授予或已经授予或应用程序正在Pre Marshmallow上运行，那么只需去显示主要内容，几乎半秒的延迟，以便用户可以欣赏我们在阅读这个问题时所付出的努力，并试图给予我们最好的。
import android.Manifest;
import android.annotation.TargetApi;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;
import com.c2h5oh.beer.R;
import com.c2h5oh.beer.utils.Animatrix;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class SplashActivity extends AppCompatActivity {
final private int REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS = 124;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
//show animations
Animatrix.scale(findViewById(R.id.title_play), 100);
Animatrix.scale(findViewById(R.id.title_edit), 100);
Animatrix.scale(findViewById(R.id.title_record), 100);
Animatrix.scale(findViewById(R.id.title_share), 100);
if (Build.VERSION.SDK_INT >= 23) {
// Marshmallow+ Permission APIs
fuckMarshMallow();
} else {
// Pre-Marshmallow
///Display main contents
displaySplashScreen();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode) {
case REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS: {
Map<String, Integer> perms = new HashMap<String, Integer>();
// Initial
perms.put(Manifest.permission.READ_EXTERNAL_STORAGE, PackageManager.PERMISSION_GRANTED);
perms.put(Manifest.permission.RECORD_AUDIO, PackageManager.PERMISSION_GRANTED);
perms.put(Manifest.permission.MODIFY_AUDIO_SETTINGS, PackageManager.PERMISSION_GRANTED);
perms.put(Manifest.permission.VIBRATE, PackageManager.PERMISSION_GRANTED);
// Fill with results
for (int i = 0; i < permissions.length; i++)
perms.put(permissions[i], grantResults[i]);
// Check for ACCESS_FINE_LOCATION
if (perms.get(Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED
&& perms.get(Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED
&& perms.get(Manifest.permission.MODIFY_AUDIO_SETTINGS) == PackageManager.PERMISSION_GRANTED
&& perms.get(Manifest.permission.VIBRATE) == PackageManager.PERMISSION_GRANTED) {
// All Permissions Granted
// Permission Denied
Toast.makeText(SplashActivity.this, "All Permission GRANTED !! Thank You :)", Toast.LENGTH_SHORT)
.show();
displaySplashScreen();
} else {
// Permission Denied
Toast.makeText(SplashActivity.this, "One or More Permissions are DENIED Exiting App :(", Toast.LENGTH_SHORT)
.show();
finish();
}
}
break;
default:
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
@TargetApi(Build.VERSION_CODES.M)
private void fuckMarshMallow() {
List<String> permissionsNeeded = new ArrayList<String>();
final List<String> permissionsList = new ArrayList<String>();
if (!addPermission(permissionsList, Manifest.permission.READ_EXTERNAL_STORAGE))
permissionsNeeded.add("Read SD Card");
if (!addPermission(permissionsList, Manifest.permission.RECORD_AUDIO))
permissionsNeeded.add("Record Audio");
if (!addPermission(permissionsList, Manifest.permission.MODIFY_AUDIO_SETTINGS))
permissionsNeeded.add("Equilizer");
if (!addPermission(permissionsList, Manifest.permission.VIBRATE))
permissionsNeeded.add("Vibrate");
if (permissionsList.size() > 0) {
if (permissionsNeeded.size() > 0) {
// Need Rationale
String message = "App need access to " + permissionsNeeded.get(0);
for (int i = 1; i < permissionsNeeded.size(); i++)
message = message + ", " + permissionsNeeded.get(i);
showMessageOKCancel(message,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
requestPermissions(permissionsList.toArray(new String[permissionsList.size()]),
REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS);
}
});
return;
}
requestPermissions(permissionsList.toArray(new String[permissionsList.size()]),
REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS);
return;
}
Toast.makeText(SplashActivity.this, "No new Permission Required- Launching App .You are Awesome!!", Toast.LENGTH_SHORT)
.show();
displaySplashScreen();
}
private void showMessageOKCancel(String message, DialogInterface.OnClickListener okListener) {
new AlertDialog.Builder(SplashActivity.this)
.setMessage(message)
.setPositiveButton("OK", okListener)
.setNegativeButton("Cancel", null)
.create()
.show();
}
@TargetApi(Build.VERSION_CODES.M)
private boolean addPermission(List<String> permissionsList, String permission) {
if (checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) {
permissionsList.add(permission);
// Check for Rationale Option
if (!shouldShowRequestPermissionRationale(permission))
return false;
}
return true;
}
/**
* Display main content with little delay just so that user can see
* efforts I put to make this page
*/
private void displaySplashScreen() {
new Handler().postDelayed(new Runnable() {
/*
* Showing splash screen with a timer. This will be useful when you
* want to show case your app logo / company
*/
@Override
public void run() {
startActivity(new Intent(SplashActivity.this, AudioPlayerActivity.class));
finish();
}
}, 500);
}
}
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