https://github.com/nispok/snackbarjava
默認Snackbar支持底部或者頂部顯示,不支持居中顯示android
查看Snackbar.java的源碼能夠看到createMarginLayoutParams方法中有位置的處理SnackbarPosition ,git
針對不一樣的顯示位置設置對應的params規則,這裏咱們將表示位置的枚舉SnackbarPosition中添加一種類型PARENT_CENTERgithub
public static enum SnackbarPosition { TOP(Gravity.TOP), BOTTOM(Gravity.BOTTOM), BOTTOM_CENTER(Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL) , PARENT_CENTER(Gravity.CENTER_VERTICAL); }
createMarginLayoutParams方法中部分邏輯修改以下:ide
else if (viewGroup instanceof RelativeLayout) { RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(width, height); if (position == SnackbarPosition.TOP) params.addRule(RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.TRUE); else if(position == SnackbarPosition.BOTTOM) params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, RelativeLayout.TRUE); else if(position == SnackbarPosition.PARENT_CENTER) params.addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE); return params; }
若是viewgGroup的類型不是RelativeLayout,也能夠不修改createMarginLayoutParams方法中的邏輯。函數
由於,提示條在中間顯示默認位移的動畫效果有些突兀,這裏咱們修改下居中顯示時的動畫效果,修改成透明度動畫。動畫
修改兩個獲取動畫資源函數:this
/** * @param snackbarPosition * @return the animation resource used by this {@link com.nispok.snackbar.Snackbar} instance * to enter the view */ @AnimRes public static int getInAnimationResource(SnackbarPosition snackbarPosition) { return snackbarPosition == SnackbarPosition.TOP ? R.anim.sb__top_in : (snackbarPosition == SnackbarPosition.PARENT_CENTER ? R.anim.sb__center_in : R.anim.sb__bottom_in); } /** * @param snackbarPosition * @return the animation resource used by this {@link com.nispok.snackbar.Snackbar} instance * to exit the view */ @AnimRes public static int getOutAnimationResource(SnackbarPosition snackbarPosition) { return snackbarPosition == SnackbarPosition.TOP ? R.anim.sb__top_out : (snackbarPosition == SnackbarPosition.PARENT_CENTER ? R.anim.sb__center_out : R.anim.sb__bottom_out); }
anim文件夾下增長sb__center_in sb__center_out兩個配置文件以下:spa
sb__center_in.xmlcode
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <alpha xmlns:android="http://schemas.android.com/apk/res/android" android:duration="500" android:fromAlpha="0" android:interpolator="@interpolator/sb__decelerate_cubic" android:toAlpha="1" /> </set>
sb__center_out.xml
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <alpha xmlns:android="http://schemas.android.com/apk/res/android" android:duration="500" android:fromAlpha="1" android:interpolator="@interpolator/sb__decelerate_cubic" android:toAlpha="0" /> </set>
在sample的示例代碼SnackSampleActivity中單行顯示文本的Snackbar的代碼修改以下:
singleLineButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { SnackbarManager.show( Snackbar.with(SnackbarSampleActivity.this) .position(Snackbar.SnackbarPosition.PARENT_CENTER) .margin(25) .text("Center Single-line snackbar")); } });
最終顯示效果以下: