android启动界面的两种方式_android怎么调出手机界面

MainActiviy.java

package com.example.administrator.logopage;
 
import android.animation.Animator;
import android.animation.AnimatorSet;
import android.animation.TimeInterpolator;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.PixelFormat;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.WindowManager;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.widget.ImageView;
import android.widget.TextView;
 
public class MainActivity extends Activity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        new Handler().postDelayed(new Runnable() {
            public void run() {
                /* Create an Intent that will start the Main WordPress Activity. */
                Intent mainIntent = new Intent(MainActivity.this, Main2Activity.class);
                MainActivity.this.startActivity(mainIntent);
                MainActivity.this.finish();
            }
        }, 3000);
    }
 
}

在跳转到的Main2Activity中添加按键监听

 @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode==KeyEvent.KEYCODE_BACK){
            Intent i= new Intent(Intent.ACTION_MAIN);  //主启动，不期望接收数据
 
            i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);       //新的activity栈中开启，或者已经存在就调到栈前
 
            i.addCategory(Intent.CATEGORY_HOME);            //添加种类，为设备首次启动显示的页面
 
            startActivity(i);
        }
        return super.onKeyDown(keyCode, event);
    }

按下返回就会跟按下home键操作一致，效果自行尝试。

2.直接在主页中实现，这样可能会好些，代码如下

package com.example.administrator.logopage;
 
import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.widget.LinearLayout;
 
public class Main2Activity extends Activity {
    LinearLayout linearLayout;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        AlphaAnimation animation=new AlphaAnimation(1.0f,1.0f);
        animation.setDuration(2000);
        linearLayout= (LinearLayout) findViewById(R.id.ll);
        linearLayout.setAnimation(animation);
        animation.setAnimationListener(new Animation.AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {
                linearLayout.setVisibility(View.VISIBLE);
            }
 
            @Override
            public void onAnimationEnd(Animation animation) {
                linearLayout.setVisibility(View.GONE);  //隐藏起来，不需要任何布局空间
            }
 
            @Override
            public void onAnimationRepeat(Animation animation) {
                //linearLayout.setVisibility(View.GONE);
            }
        }
        );
    }
 
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode==KeyEvent.KEYCODE_BACK){
            Intent i= new Intent(Intent.ACTION_MAIN);  //主启动，不期望接收数据
 
            i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);       //新的activity栈中开启，或者已经存在就调到栈前
 
            i.addCategory(Intent.CATEGORY_HOME);            //添加种类，为设备首次启动显示的页面
 
            startActivity(i);
        }
        return super.onKeyDown(keyCode, event);
    }
}

在布局文件的前面添加了一个线形布局，放入要设置的启动image,给他设置了一个2秒的动画，监听动画结束时，设置他为隐藏。也为它设置了返回按钮的监听，设置和home功能相同布局文件如下

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.administrator.logopage.Main2Activity">
    <LinearLayout
        android:orientation="vertical"
        android:id="@+id/ll"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@mipmap/ic_launcher">
    </LinearLayout>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="过来了"/>
</LinearLayout>

效果是显示两秒的背景同，然后文本视图就出来了。