Android启动页及其相关_安卓activity_main可以当启动页吗

一、新建一个启动页Activity（Main2Activity .java），代码如下

package com.bignerdranch.android.myapplication;
 
import android.content.Intent;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.TextView;
 
import java.util.Timer;
import java.util.TimerTask;
 
public class Main2Activity extends AppCompatActivity implements View.OnClickListener{
 
    private int recLen = 5;//跳过倒计时提示5秒
    private TextView tv;
    Timer timer = new Timer();
    private Handler handler;
    private Runnable runnable;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //定义全屏参数
        int flag = WindowManager.LayoutParams.FLAG_FULLSCREEN;
        //设置全屏
        getWindow().setFlags(flag,flag);
        //隐藏标题栏
        getSupportActionBar().hide();
        setContentView(R.layout.activity_main2);
        initView();
        //等待一秒，停留一秒
        timer.schedule(task,1000,1000);
 
        handler = new Handler();
        handler.postDelayed(runnable = new Runnable() {
            @Override
            public void run() {
                //从启动界面跳转到主界面
                Intent intent = new Intent(Main2Activity.this,MainActivity.class);
                startActivity(intent);
                finish();
            }
            //延时5s发送handler信息
        },5000);
    }
 
    private void initView() {
        //跳过监听
        tv = findViewById(R.id.textView2);
        tv.setOnClickListener(this);
    }
 
    TimerTask task = new TimerTask() {
        @Override
        public void run() {
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    recLen--;
                    tv.setText("跳过 "+recLen );
                    if (recLen < 0){
                        timer.cancel();
                        tv.setVisibility(View.GONE);
                    }
                }
            });
        }
    };
    //点击跳过
    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.textView2:
                Intent intent = new Intent(Main2Activity.this,MainActivity.class);
                startActivity(intent);
                finish();
                if (runnable != null){
                    handler.removeCallbacks(runnable);
                }
                break;
                default:
                    break;
        }
    }
}

二、新建一个对应的布局文件（activity_main2.xml），这个布局中包括一个跳过按钮，一个图片，一个textView，可随意添加，在此之前记得先在drawable文件夹下添加需要展示的启动页图片。

<?xml version="1.0" encoding="utf-8"?>
<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"
    tools:context=".Main2Activity">
 
    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:contentDescription="@string/todo"
        app:layout_constraintBottom_toTopOf="@+id/textView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="1.0"
        app:srcCompat="@drawable/test" />
 
    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        android:text="@string/coolapk"
        android:textSize="24sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/imageView" />
 
    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:text="TextView"
        android:background="@drawable/shape"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

三、修改AndroidMainifest.xml，先启动启动页Activity，将主Activity中的intent-filter标签移到启动页Activity下。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.bignerdranch.android.myapplication">
 
    <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=".MainActivity">
 
        </activity>
        <activity android:name=".Main2Activity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
 
</manifest>