android app主程序启动前加载图片

2021-07-04 15:59:11

android app加载启动图片需要新创建一个activity，在主activity先加载图片activity，展示过程结束后，显示主activity。具体流程如下：

一、创建图片activity的运行类

package com.smallart.myapplication;

import android.content.Context;

import android.content.Intent;

import android.content.res.Resources;

import android.media.MediaPlayer;

import android.net.Uri;

import android.os.Build;

import android.os.Message;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.os.Handler;

import android.util.Log;

import android.view.MotionEvent;

import android.view.View;

import android.view.ViewConfiguration;

import android.view.WindowManager;

import android.widget.Toast;

import android.widget.ImageView;

import com.nostra13.universalimageloader.core.ImageLoader;

import java.lang.reflect.Method;

public class HomeActivity extends AppCompatActivity {

    private ImageView mImageView;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,

                WindowManager.LayoutParams.FLAG_FULLSCREEN);

        getWindow().setFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON,

                WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

        hideBottomUIMenu(this);

        setContentView(R.layout.activity_home);

    }

}

二、在AndroidManisest.xml文件中，添加activity的注册

    <application

        android:name="com.smallart.myapplication.Application"

        android:configChanges="orientation|keyboardHidden"

        android:allowBackup="true"

        android:icon="@mipmap/ic_app_icon"

        android:label="@string/app_name"

        android:roundIcon="@mipmap/ic_app_icon_round"

        android:largeHeap="true"

        android:supportsRtl="true"

        android:theme="@style/Theme.AppCompat.Light.NoActionBar">

        <activity android:name=".MainActivity"

            android:screenOrientation="sensorLandscape"

            android:configChanges="orientation|keyboardHidden|screenSize">

        </activity>

        <activity android:name=".HomeActivity"

            android:screenOrientation="sensorLandscape"

            android:configChanges="orientation|keyboardHidden|screenSize">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

三、显示图片，在HomeActivity.java中的onCreate中添加图片显示代码：

        this.mImageView = ((ImageView)findViewById(R.id.img));

        ImageLoader.getInstance().displayImage("drawable://bg_app_start.jpg", this.mImageView);

四、增加线程，5秒后切换activity，完整代码如下：

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,

                WindowManager.LayoutParams.FLAG_FULLSCREEN);

        getWindow().setFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON,

                WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

        hideBottomUIMenu(this);

        setContentView(R.layout.activity_home);

        this.mImageView = ((ImageView)findViewById(R.id.img));

        ImageLoader.getInstance().displayImage("drawable://bg_app_start.jpg", this.mImageView);

        handler.sendEmptyMessageDelayed(,);

    }

    private Handler handler = new Handler() {

        //Intent intent = new Intent(MainActivity.this, HomeActivity.class);

        @Override

        public void handleMessage(Message msg) {

            getHome();

            super.handleMessage(msg);

        }

    };

    public void getHome(){

        Intent intent = new Intent(HomeActivity.this, MainActivity.class);

        startActivity(intent);

        overridePendingTransition(, );

        finish();

    }

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