最近.一個朋友跟我說想,我給她弄個鬧鐘APP軟件...功能其實很簡單...只需要弄個簡單的鬧鐘.自己設計設計時間.然后時間到了的時候,鬧鈴放的聲音是男朋友錄制好的聲音...于是就開始整了....
第一次做這種的時候.我想把首頁界面做成一個GIF動畫特效的.這樣看起來可愛點...適合妹子用,于是就有了下面這個效果圖
上代碼
ndroid中的Android.graphics.Movie 這個類，這是android提供給我們的一個非常方便的工具。
首先，重寫控件View,自定義一個展示gif圖的GifView
Movie其實管理著GIF動畫中的多個幀，只需要通過 setTime() 一下就可以讓它在draw()的時候繪出相應的那幀圖像。通過當前時間與duration之間的換算關系，是很容易實現GIF動起來的效果。
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public class GifView extends View { /** * 默認為1秒 */ private static final int DEFAULT_MOVIE_DURATION = 1000; private int mMovieResourceId; private Movie mMovie; private long mMovieStart; private int mCurrentAnimationTime = 0; private float mLeft; private float mTop; private float mScale; private int mMeasuredMovieWidth; private int mMeasuredMovieHeight; private boolean mVisible = true; private volatile boolean mPaused = false; public GifView(Context context) { this(context, null); } public GifView(Context context, AttributeSet attrs) { this(context, attrs, R.styleable.CustomTheme_gifViewStyle); } public GifView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); setViewAttributes(context, attrs, defStyle); } @SuppressLint("NewApi") private void setViewAttributes(Context context, AttributeSet attrs, int defStyle) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { setLayerType(View.LAYER_TYPE_SOFTWARE, null); } // 從描述文件中讀出gif的值，創建出Movie實例 final TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.GifView, defStyle, R.style.Widget_GifView); mMovieResourceId = array.getResourceId(R.styleable.GifView_gif, -1); mPaused = array.getBoolean(R.styleable.GifView_paused, false); array.recycle(); if (mMovieResourceId != -1) { mMovie = Movie.decodeStream(getResources().openRawResource( mMovieResourceId)); } } /** * 設置gif圖資源 * * @param movieResId */ public void setMovieResource(int movieResId) { this.mMovieResourceId = movieResId; mMovie = Movie.decodeStream(getResources().openRawResource( mMovieResourceId)); requestLayout(); } public void setMovie(Movie movie) { this.mMovie = movie; requestLayout(); } public Movie getMovie() { return mMovie; } public void setMovieTime(int time) { mCurrentAnimationTime = time; invalidate(); } /** * 設置暫停 * * @param paused */ public void setPaused(boolean paused) { this.mPaused = paused; if (!paused) { mMovieStart = android.os.SystemClock.uptimeMillis() - mCurrentAnimationTime; } invalidate(); } /** * 判斷gif圖是否停止了 * * @return */ public boolean isPaused() { return this.mPaused; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { if (mMovie != null) { int movieWidth = mMovie.width(); int movieHeight = mMovie.height(); int maximumWidth = MeasureSpec.getSize(widthMeasureSpec); float scaleW = (float) movieWidth / (float) maximumWidth; mScale = 1f / scaleW; mMeasuredMovieWidth = maximumWidth; mMeasuredMovieHeight = (int) (movieHeight * mScale); setMeasuredDimension(mMeasuredMovieWidth, mMeasuredMovieHeight); } else { setMeasuredDimension(getSuggestedMinimumWidth(), getSuggestedMinimumHeight()); } } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); mLeft = (getWidth() - mMeasuredMovieWidth) / 2f; mTop = (getHeight() - mMeasuredMovieHeight) / 2f; mVisible = getVisibility() == View.VISIBLE; } @Override protected void onDraw(Canvas canvas) { if (mMovie != null) { if (!mPaused) { updateAnimationTime(); drawMovieFrame(canvas); invalidateView(); } else { drawMovieFrame(canvas); } } } @SuppressLint("NewApi") private void invalidateView() { if (mVisible) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { postInvalidateOnAnimation(); } else { invalidate(); } } } private void updateAnimationTime() { long now = android.os.SystemClock.uptimeMillis(); // 如果第一幀，記錄起始時間 if (mMovieStart == 0) { mMovieStart = now; } // 取出動畫的時長 int dur = mMovie.duration(); if (dur == 0) { dur = DEFAULT_MOVIE_DURATION; } // 算出需要顯示第幾幀 mCurrentAnimationTime = (int) ((now - mMovieStart) % dur); } private void drawMovieFrame(Canvas canvas) { // 設置要顯示的幀，繪制即可 mMovie.setTime(mCurrentAnimationTime); canvas.save(Canvas.MATRIX_SAVE_FLAG); canvas.scale(mScale, mScale); mMovie.draw(canvas, mLeft / mScale, mTop / mScale); canvas.restore(); } @SuppressLint("NewApi") @Override public void onScreenStateChanged(int screenState) { super.onScreenStateChanged(screenState); mVisible = screenState == SCREEN_STATE_ON; invalidateView(); } @SuppressLint("NewApi") @Override protected void onVisibilityChanged(View changedView, int visibility) { super.onVisibilityChanged(changedView, visibility); mVisible = visibility == View.VISIBLE; invalidateView(); } @Override protected void onWindowVisibilityChanged(int visibility) { super.onWindowVisibilityChanged(visibility); mVisible = visibility == View.VISIBLE; invalidateView(); } } |
其次，在xml布局文件中，把這個view定義進去，代碼如下：
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#ffffff" android:gravity="center" android:orientation="vertical" > <com.example.alarmtest.GifView android:id="@+id/gif1" android:layout_width="300dp" android:layout_height="300dp" android:layout_gravity="center_horizontal" android:enabled="false"/> <Button android:id="@+id/bu" android:text="進入" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal"/> </LinearLayout> |
最后，在MainActivity中的使用，代碼如下：
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public class FirstActivity extends Activity { private GifView gif; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_first); gif = (GifView) findViewById(R.id.gif1); // 設置背景gif圖片資源 gif.setMovieResource(R.raw.a123); } } |
Styles.xml
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<declare-styleable name="GifView"> <attr name="gif" format="reference" /> <attr name="paused" format="boolean" /> </declare-styleable> <declare-styleable name="CustomTheme"> <attr name="gifViewStyle" format="reference" /> </declare-styleable> <style name="Widget_GifView"></style> |
raw是res下面的一個文件放的是GIF動畫圖噢
我這里放了一個動畫圖 跟一個 音樂文件,因為我要做的是一個有聲音的鬧鈴
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原文鏈接：https://blog.csdn.net/bfboys/article/details/53183171
