Android 中用于接听电话的滑块按钮

我想为来电开发自己的“接受”和“拒绝”按钮。为了防止从口袋里拿出手机时意外接听或拒绝来电，我想制作一个滑块式按钮或类似的东西。我是，接听电话不仅仅是点击“接听”按钮。这更像是从左向右（或相反）滑动手指，让按钮随着时间变宽。就像安卓一样。

有什么办法可以做到这一点吗？有什么提示吗？

我希望能说清楚。

创建一个图像并将其向右（或向左）滑动，然后将事件发送到您想要处理结果的活动或任何视图怎么样？

为此，您可以创建一个自定义视图来实现OnTouchListener :

public class ImageTouchSlider extends RelativeLayout implements View.OnTouchListener {

private Context mContext;

private ImageView mImage;   
private int mScreenWidthInPixel;
private int mScreenWidthInDp;
private float mDensity;

private int mPaddingInDp = 15;
private int mPaddingInPixel;

private int mLengthOfSlider;

public interface OnImageSliderChangedListener{
    void onChanged();
}

private OnImageSliderChangedListener mOnImageSliderChangedListener;

public ImageTouchSlider(Context context) {
    super(context);
    mContext = context;
    createView();
}

public ImageTouchSlider(Context context, AttributeSet attrs) {
    super(context, attrs);
    mContext = context;
    createView();
}

public ImageTouchSlider(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    mContext = context;
    createView();
}

public void createView() {
    LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    inflater.inflate(R.layout.image_touch_slider, this, true);

    mImage = (ImageView) findViewById(R.id.slider_image);
    mImage.setOnTouchListener(this);

    WindowManager manager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
    Display display = manager.getDefaultDisplay();
    DisplayMetrics outMetrics = new DisplayMetrics ();
    display.getMetrics(outMetrics);

    mDensity  = getResources().getDisplayMetrics().density;
    float dpWidth  = outMetrics.widthPixels / mDensity;
    mScreenWidthInPixel = outMetrics.widthPixels;
    mScreenWidthInDp = (int) (mScreenWidthInPixel / mDensity);

    mLengthOfSlider = (int) (mScreenWidthInDp - mPaddingInDp*2);
}

@Override
public boolean onTouch(View v, MotionEvent event) {
    LayoutParams layoutParams = (LayoutParams) v.getLayoutParams();
    int width = v.getWidth();
    float xPos = event.getRawX();

    switch(event.getAction()) {
    case MotionEvent.ACTION_DOWN:
        // You can add some clicked reaction here.
        break;
    case MotionEvent.ACTION_MOVE:
        if(xPos < (mScreenWidthInPixel - width - mPaddingInDp*mDensity) && xPos > mPaddingInDp*mDensity) {
            mOnImageSliderChangedListener.onChanged();
            layoutParams.leftMargin = (int) xPos - width / 2;
            mImage.setLayoutParams(layoutParams);
        }
        break;
    case MotionEvent.ACTION_UP:
        break;
    default:
        break;
    }

    return true;
}

public void setOnImageSliderChangedListener(OnImageSliderChangedListener listener) {
    mOnImageSliderChangedListener = listener;
}

} //end of class

image_touch_slider.xml 布局：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<ImageView
    android:id="@+id/slider"
    android:layout_width="30dp"
    android:layout_height="30dp"
    android:layout_centerVertical="true"
    android:src="@drawable/your_drawable" />
</RelativeLayout>

您可以修改屏幕宽度计算部分（我当前的代码不太干净），并将此视图添加到.xml像这样 ：

<com.your.package.path.ImageTouchSlider
      android:id="@+id/slider"
      android:layout_width="match_parent"
      android:layout_height="wrap_content" />

在您的班级中，您可以找到以下视图：

ImageTouchSlider slider = (ImageTouchSlider) findViewById(R.id.slider);
slider.setOnImageSliderChangedListener(new ImageTouchSlider.OnImageSliderChangedListener() {

        @Override
        public void onChanged() {
            // do something what you want here.
        }

    });

希望这能有所帮助！ :)