Android 启动画面 ImageView 未加载

Question

我的 Android 应用程序在加载时应该显示一个仅由 ImageView 组成的启动画面。 ImageView 应该只显示本地资源。这是我的代码：

public class GameActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        ImageView splash = new ImageView(this);
        splash.setImageResource(R.drawable.splashImage);

        RelativeLayout layout = new RelativeLayout(this);
        layout.setId(R.id.gameView);
        uilayout addView(splash, someLayoutParams);
        setContentView(layout, someOtherLayoutParams);
        // with a return-statement, the image would be displayed now

        final GameActivity activity = this;
        this.findViewById(R.id.gameView).getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                // this is supposed to wait until the image has been fully loaded
                activity.init(this);
            }
        });
    }

    public void init(ViewTreeObserver.OnGlobalLayoutListener listener) {
        try {
            findViewById(R.id.gameView).getViewTreeObserver().removeOnGlobalLayoutListener(listener);
        } catch (NoSuchMethodError x) {
            findViewById(R.id.gameView).getViewTreeObserver().removeGlobalOnLayoutListener(listener);
        } finally {
            LinearLayout layout = new LinearLayout(this);
            // lots of stuff
            setContentView(layout);
        }
    }
}

我的问题是，一旦我在第一次调用 setContentView() 后执行代码，我的 初始屏幕图像就不会显示 并且新布局会立即显示。我将不胜感激任何有关如何解决此问题的帮助。

编辑： 认为我的代码是启动画面的理想解决方案是我的错。 This 教程真的帮了我大忙。我基于本教程的解决方案：

@drawable/layer-list_splash:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:drawable="@color/color_background"/>

    <item>
        <bitmap
            android:gravity="center"
            android:src="@drawable/sprite_splash"/>
    </item>
</layer-list>

和我的styles.xml:

<resources>
    <style name="AppTheme" parent="Theme.AppCompat.NoActionBar">
        <item name="android:windowBackground">@drawable/layers_splash</item>
    </style>
</resources>

Answer 1

你可以这样做

通过以下Activity (SplashScreen.java) 作为您的启动器 Activity（您应用的主要入口点）。
为初始图像创建单独的布局。

splash.xml

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/TheSplashLayout"
    android:layout_gravity="center"
    >
    <ImageView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/SplashImageView"
        android:layout_gravity="center"
        android:src="@drawable/your_splash_image"
        />
</LinearLayout>

SplashScreen.java

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.MotionEvent;

import com.example.harsh.gmfbp.R;

public class SplashScreen extends Activity {

    /**
     * The thread to process splash screen events
     */
    private Thread mSplashThread;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Splash screen view
        setContentView(R.layout.splash);

        final SplashScreen sPlashScreen = this;

        // The thread to wait for splash screen events
        mSplashThread =  new Thread(){
            @Override
            public void run(){
                try {
                    synchronized(this){
                        // Wait given period of time or exit on touch
                        wait(5000);
                    }
                }
                catch(InterruptedException ex){
                }

                finish();

                // Run next activity which is your GameActivity
                Intent intent = new Intent();
                intent.setClass(sPlashScreen, MainActivity.class); //Here You Can Replace MainActivity.class with your GameActivity

                startActivity(intent);

            }
        };

        mSplashThread.start();
    }

    /**
     * Processes splash screen touch events
     */
    @Override
    public boolean onTouchEvent(MotionEvent evt)
    {
        if(evt.getAction() == MotionEvent.ACTION_DOWN)
        {
            synchronized(mSplashThread){
                mSplashThread.notifyAll();
            }
        }
        return true;
    }
}

Answer 2

运行 activity.init() 2 秒后显示启动画面如何？

new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            activity.init();
        }
    }, 2000)

Android 启动画面 ImageView 未加载

Android splash screen ImageView not loading

android

splash-screen

imageview