Camera app 分析（三）拍照流程

最新推荐文章于 2024-12-18 11:13:31 发布

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最新推荐文章于 2024-12-18 11:13:31 发布 · 803 阅读

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拍照过程：
首先来看下拍照按键的点击按钮事件：

ShutterButton.java

    protected void drawableStateChanged() {
        super.drawableStateChanged();
        final boolean pressed = isPressed();
        if (pressed != mOldPressed) {
            if (!pressed) {
                // When pressing the physical camera button the sequence of
                // events is:
                //    focus pressed, optional camera pressed, focus released.
                // We want to emulate this sequence of events with the shutter
                // button. When clicking using a trackball button, the view
                // system changes the drawable state before posting click
                // notification, so the sequence of events is:
                //    pressed(true), optional click, pressed(false)
                // When clicking using touch events, the view system changes the
                // drawable state after posting click notification, so the
                // sequence of events is:
                //    pressed(true), pressed(false), optional click
                // Since we're emulating the physical camera button