Android用动画实现闪屏效果

这几天在接SDK的时候，发现好多渠道都需接入闪屏，可是很多家的闪屏不是那么好，自己就写了一套，使用Android动画来实现闪屏，废话不多说直接上代码。
先在项目中创建一个类，我这里取名就叫 WelcomeActivity
1、实现代码:
public class WelcomeActivity extends Activity {

private Handler mHandler = new Handler();
private ImageView splashImageView;
private Bitmap imageViewBitmap = null;
private int orientation;
private LruCache<String, Bitmap> mMemoryCache;

private int screenWidth;
private int screenHeight;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_welcome);

    int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
    int cacheSize = maxMemory / 8;
    mMemoryCache = new LruCache<String, Bitmap>(cacheSize) {
        @Override
        protected int sizeOf(String key, Bitmap bitmap) {
            return bitmap.getByteCount() / 1024;
        }
    };
    splashImageView = (ImageView) findViewById(R.id.splashId);
    orientation = getResources().getConfiguration().orientation;
    if (orientation == Configuration.ORIENTATION_PORTRAIT) {
        imageViewBitmap = getBitmap(R.drawable.letv_gamesdk_logo_port);
    } else if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
        imageViewBitmap = getBitmap(R.drawable.letv_gamesdk_logo_land);
    }
    loadSplashIn();
}

public void addBitmapToMemoryCache(String key, Bitmap bitmap) {
    if (getBitmapFromMemCache(key) == null) {
        mMemoryCache.put(key, bitmap);
    }
}

public Bitmap getBitmapFromMemCache(String key) {
    return mMemoryCache.get(key);
}

public void loadSplashIn() {
    AlphaAnimation alphaAnimation_in = new AlphaAnimation(0.0f, 1.0f);
    alphaAnimation_in.setDuration(2000);
    alphaAnimation_in.setAnimationListener(new AnimationListener() {

        @Override
        public void onAnimationStart(Animation animation) {
            // TODO Auto-generated method stub
            if (splashImageView != null) {
                splashImageView.setImageBitmap(imageViewBitmap);
            }
        }

        @Override
        public void onAnimationRepeat(Animation animation) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onAnimationEnd(Animation animation) {
            // TODO Auto-generated method stub

            mHandler.postDelayed(new Runnable() {

                @Override
                public void run() {
                    // TODO Auto-generated method stub
                    loadSplashOut();
                }
            }, 1500);
        }
    });

    splashImageView.startAnimation(alphaAnimation_in);

}

public Bitmap getBitmap(int id) {

    Bitmap bitmap = getBitmapFromMemCache("splash");
    if (bitmap != null) {
        return bitmap;
    }
    WindowManager wm = this.getWindowManager();
    DisplayMetrics dm = new DisplayMetrics();
    wm.getDefaultDisplay().getMetrics(dm);
    screenWidth = dm.widthPixels;
    screenHeight = dm.heightPixels;
    bitmap = decodeSampledBitmapFromResource(getResources(), id, screenWidth, screenHeight);

    addBitmapToMemoryCache("splash", bitmap);

    return bitmap;
}

public void loadSplashOut() {
    AlphaAnimation alphaAnimation_out = new AlphaAnimation(1.0f, 0.0f);
    alphaAnimation_out.setDuration(1000);
    alphaAnimation_out.setAnimationListener(new AnimationListener() {

        @Override
        public void onAnimationStart(Animation animation) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onAnimationRepeat(Animation animation) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onAnimationEnd(Animation animation) {
            // TODO Auto-generated method stub
            splashImageView.setImageBitmap(null);
            Intent intent = new Intent();
            intent.setClass(getApplicationContext(), MainActivity.class);
            startActivity(intent);
            WelcomeActivity.this.finish();
            imageViewBitmap.recycle();
            imageViewBitmap = null;
        }
    });
    splashImageView.startAnimation(alphaAnimation_out);
}

public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;
    if (height > reqHeight || width > reqWidth) {
        if (width > height) {
            inSampleSize = Math.round((float) height / (float) reqHeight);
        } else {
            inSampleSize = Math.round((float) width / (float) reqWidth);
        }
    }
    return inSampleSize;
}

public Bitmap decodeSampledBitmapFromResource(Resources res, int resId, int reqWidth, int reqHeight) {

    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeResource(res, resId, options);
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeResource(res, resId, options);
}

}

2、配置文件

<activity android:name="com.xxx.xxx.xxx.WelcomeActivity" //闪屏Activity android:label="@string/app_name" android:theme="@android:style/Theme.NoTitleBar.Fullscreen" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name="com.xxx.xxx.xxx.MainActivity" //自己的Activity android:label="@string/title_activity_game" android:theme="@android:style/Theme.NoTitleBar.Fullscreen" > </activity>

3、配置xml
activity_welcome.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent" android:layout_height="fill_parent" tools:context="com.qianhuan.yxgsd.leshi.WelcomeActivity" >
<ImageView android:id="@+id/splashId" android:layout_width="fill_parent" android:layout_height="fill_parent" android:contentDescription="@null" />
</RelativeLayout>
`
这样加上自己的MainActivity，就可以测试了，这样一个不错的闪屏界面就出来了，效果杠杠的，亲测！！！