如果還不知道DecorView，那也沒有什么關系 _
先來看看實現(xiàn)的效果
模仿了一個對話框
從屏幕頂部出來一個提示消息
實現(xiàn)的大致思路
首先需要明白什么是DecorView揽涮，他是android中界面的根布局。其實android的activity界面整個就是一個控件樹，DecorView是根節(jié)點桦卒，DecorView的孩子節(jié)點就是一個LinearLayout，這個LinearLayout的孩子系節(jié)點就包括狀態(tài)欄 + 和我們自己寫的布局
DecorView是FramLayout的子類（可以從源碼中看到）
既然DecorView是根節(jié)點匿又，而且還是FrameLayout方灾，所以我們可以把我們自己的布局 添加到DecorView 或者 從DecorView移除，這樣就模擬出了一個Dialog的效果~~ ，當然這個Dialog的樣式裕偿，動畫就可以自己想怎么寫就怎么寫了撒
通過activity.getWindow().getDecorView()可以獲得DecorView
[下面大量 代碼 ]
第一個對話框的實現(xiàn)
public class TipsDialog {
private Activity activity;
private View rootView;
private TextView confirmTextView;
private TextView cancelTextView;
private TextView contentTextView;
private boolean isShowing;
public TipsDialog(Activity activity) {
this.activity = activity;
isShowing = false;
rootView = LayoutInflater.from(activity).inflate(R.layout.view_tips_dialog,null);
confirmTextView = (TextView) rootView.findViewById(R.id.view_tips_dialog_tv_confirm);
cancelTextView = (TextView) rootView.findViewById(R.id.view_tips_dialog_tv_cancel);
contentTextView = (TextView) rootView.findViewById(R.id.view_tips_dialog_tv_content);
}
public void show(){
if(activity == null){
return;
}
if(isShowing){
return;
}
ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView();
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
params.gravity = Gravity.CENTER;
rootView.setLayoutParams(params);
decorView.addView(rootView);
rootView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dismiss();
}
});
RotateAnimation rotateAnimation = new RotateAnimation(0,720f,RotateAnimation.RELATIVE_TO_SELF,0.5f,RotateAnimation.RELATIVE_TO_SELF,0.5f);
rotateAnimation.setDuration(2000);
contentTextView.startAnimation(rotateAnimation);
isShowing = true;
}
public void dismiss(){
if(!isShowing){
return;
}
isShowing = false;
if(rootView.getParent() == null){
return;
}
ViewGroup parent = (ViewGroup) rootView.getParent();
parent.removeView(rootView);
}
public int getRandomColor(){
Random random = new Random();
return Color.argb(random.nextInt(200),random.nextInt(240),random.nextInt(240),random.nextInt(240));
}
public boolean isShowing() {
return isShowing;
}
}
- 其實就是show的時候將布局添加到DecorView上面去洞慎，dismiss的時候將布局從DecorView上面移除
提示的實現(xiàn)（沒有處理完善~~ 僅僅就是說明哈DecorView）
public class TopTipDialog {
private Activity activity;
private View rootView;
private boolean isShowing;
private static final int VIEW_HEIGHT = 64;//px
public TopTipDialog(Activity activity) {
this.activity = activity;
rootView = LayoutInflater.from(activity).inflate(R.layout.view_top_tip_dialog,null);
}
public void show(){
if(isShowing){
return;
}
ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView();
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, VIEW_HEIGHT);
params.gravity = Gravity.TOP;
params.setMargins(0,0,0,-VIEW_HEIGHT);
rootView.setLayoutParams(params);
TranslateAnimation translateAnimation = new TranslateAnimation(0,0,-VIEW_HEIGHT,0);
translateAnimation.setDuration(1500);
translateAnimation.setFillAfter(true);
decorView.addView(rootView);
rootView.startAnimation(translateAnimation);
rootView.postDelayed(new Runnable() {
@Override
public void run() {
TranslateAnimation translateAnimation1 = new TranslateAnimation(0,0,0,-VIEW_HEIGHT);
translateAnimation1.setDuration(1500);
translateAnimation1.setFillAfter(true);
rootView.startAnimation(translateAnimation1);
}
},3000);
}
}
Nothing is certain in this life. The only thing i know for sure is that. I love you and my life. That is the only thing i know. have a good day
:)
