Android提示框效果
Scofield_Phil 人气:0Toast提示只要提示的时间够长，就可以浮动到其他任何界面之上，所以我们可以模仿Toast来实现来电号码归属地的提示框
1、WindowManager
The interface that apps use to talk to the window manager. Use Context.getSystemService(Context.WINDOW_SERVICE) to get one of these. Each window manager instance is bound to a particular Display.
1）.void addView(View view,ViewGroup.LayoutParams params)
将一个View视图显示到当前窗口，LayoutParams are used by views to tell their parents how they want to be laid out.
2）.void removeView(View view); 将一个View视图从当前窗口中移除。
2、自定义窗体提示框(参考Toast源码)
WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
View view = View.inflate(getApplicationContext(), R.layout.toast_location,
null);
TextView tv = (TextView) view.findViewById(R.id.tv_toast_address);
tv.setText(address);
LayoutParams params = new LayoutParams();
params.height = WindowManager.LayoutParams.WRAP_CONTENT;
params.width = WindowManager.LayoutParams.WRAP_CONTENT;
params.gravity = Gravity.LEFT | Gravity.TOP;
params.x = sp.getInt("lastx", 0);
params.y = sp.getInt("lasty", 0);
//本来还有一个FLAG_NOTUCHALBE为了让下面能触摸把这个给去掉了
params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
params.format = PixelFormat.TRANSLUCENT; //源码中这里是TYPE_TAOST但是这里为了下面要进行点击拖动事件，而Toast不能拖动，
所以这里改成了TYPE_PRIORITY_PHONE,这是一个系统类型的提示框，使用这个提示框必须要申请权限,android.permission.SYSTEM_ALERT_WINDOW
params.type = WindowManager.LayoutParams.TYPE_PRIORITY_PHONE;
wm.addView(view, params); 3、WindowManager添加的显示框的简单拖动
该这个View注册一个onTouchListener
public void showLocation(String address) {
view = View.inflate(getApplicationContext(), R.layout.toast_location,
null);
// 得到spint which = sp.getInt("which", 0);
view.setBackgroundResource(bgs[which]);
view.setOnTouchListener(new OnTouchListener() {
int startX ,startY;
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:Log.i(TAG,"摸到");
startX = (int) event.getRawX();
startY = (int) event.getRawY();
break;
case MotionEvent.ACTION_MOVE:Log.i(TAG,"移动");
int newX = (int) event.getRawX();
int newY = (int) event.getRawY();
int dx = newX - startX;
int dy = newY - startY;
params.x+=dx;
params.y+=dy; //这里在WindowManager中不能够使用layout方法了，无效，只能使用layoutparams来更新位置，这里的params就是上面的那个params
wm.updateViewLayout(view, params);
//重新初始化 手指的位置
startX = (int) event.getRawX();
startY = (int) event.getRawY();
break;
}
return true;
}
});
}4、普通ImageView随手指拖动改变位置
iv_drag_view.setOnTouchListener(new OnTouchListener() {
//记录住最初手指按下时的位置int startX , startY;
//onTouch方法的返回值如果是true监听器会把这个事件给消费掉, false则监听器不会消费掉这个事件public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:Log.i(TAG,"摸到这个控件了");
startX = (int) event.getRawX();//记录手指第一次点击到屏幕时候距离x和y轴的距离
startY = (int) event.getRawY();
break;
case MotionEvent.ACTION_MOVE:// 手指在屏幕上移动的事件Log.i(TAG,"移动");
int newX = (int) event.getRawX(); //在移动的过程中不断的获取到手指当前移动到的位置int newY = (int) event.getRawY();
int dx = newX - startX; //计算出手指移动了多少int dy = newY - startY;
int l = iv_drag_view.getLeft(); //获取图片上下左右的长度int r = iv_drag_view.getRight();
int b = iv_drag_view.getBottom();
int t = iv_drag_view.getTop();
int newl = l+dx; //计算图片应该移动的距离int newr = r+dx;
int newt = t+dy;//imageview 在窗体中新的位置int newb = b+dy;
//判断如果图片准备移动到的位置超出了屏幕就不让它移动,这里减去30是减去窗体上面的状态栏的高度if(newl<0||newt < 0 ||newb>display.getHeight()-30||newr>display.getWidth()){
break;
}
//将图片移动到新的位置。直接调用ImageView的layout方法
iv_drag_view.layout(newl, newt, newr, newb);
//一旦图片移动到新的位置就重新计算手指当前的位置，这样循环下去就能实现随着手指的拖动
startX = (int) event.getRawX();
startY = (int) event.getRawY();
break;
case MotionEvent.ACTION_UP: // 手指在离开屏幕的一瞬间对应的事件.Log.i(TAG,"放手");
int lasty = iv_drag_view.getTop();//得到最后在离屏幕上方的距离int lastx = iv_drag_view.getLeft();//得到最后离屏幕左边的距离Editor editor = sp.edit();
editor.putInt("lastx", lastx);
editor.putInt("lasty", lasty);
editor.commit();
break;
}
return true; //这地方一定要返回true告诉系统这个事件做完了
}
});注意：在onCreate方法中使用layout方法是没有效果的，因为在进入一个Activity中系统首先会执行一个计算的操作，计算各个控件的布局，然后调用setContentView方法显示出来这个控件，第二步才会执行这个layout方法，但是在onCreate方法中设置了layout，在执行layout这段代码的时候，窗体有可能还没有计算完控件的布局，所以先执行了这个layout，然后又执行了计算控件布局来显示，这样layout就没效了，这里要怎么弄呢只能是通过设置这个控件的layout布局，这样在计算位置的时候就能计算了，这样设置布局能让它在计算的时候就计算了。如下，在onCreate方法中去这样设置。
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
sp = getSharedPreferences("config", MODE_PRIVATE);
// Have the system blur any windows behind this one.
getWindow().setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND,
WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
wm = (WindowManager) getSystemService(WINDOW_SERVICE);//窗体管理者
display = wm.getDefaultDisplay();
setContentView(R.layout.activity_drag_view);
tv_drag_view = (TextView) findViewById(R.id.tv_drag_view);
iv_drag_view = (ImageView) findViewById(R.id.iv_drag_view);
int lastx = sp.getInt("lastx", 0);
int lasty = sp.getInt("lasty", 0);
RelativeLayout.LayoutParams params = (LayoutParams) iv_drag_view.getLayoutParams();
params.leftMargin = lastx;
params.topMargin = lasty;
iv_drag_view.setLayoutParams(params);
}注意：在WindowManager中要想更新控件的距离就不能用layout方法了，只能用mWindowManager.updateViewLayout(view, params);
5、实现双击事件
1）.双击的定义 Android中没有提供双击的点击事件，双击就是单位时间内的两次点击
2）.触摸和点击事件的区别 点击事件: 一组动作的集合 点击 - 停留 - 离开. 触摸事件: 手指按下屏幕 手指在屏幕上移动 手指离开屏幕的一瞬间
public class DragViewActivity extends Activity {
protected static final String TAG = "DragViewActivity";
private ImageView iv_drag_view;
private TextView tv_drag_view;
private SharedPreferences sp;
private WindowManager wm;
private Display display; //窗体的显示的分辨率private long firstClickTime;//第一次点击时候的事件@Overrideprotected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
sp = getSharedPreferences("config", MODE_PRIVATE);
// Have the system blur any windows behind this one.
getWindow().setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND,
WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
wm = (WindowManager) getSystemService(WINDOW_SERVICE);//窗体管理者
display = wm.getDefaultDisplay();
setContentView(R.layout.activity_drag_view);
tv_drag_view = (TextView) findViewById(R.id.tv_drag_view);
iv_drag_view = (ImageView) findViewById(R.id.iv_drag_view);
int lastx = sp.getInt("lastx", 0);
int lasty = sp.getInt("lasty", 0);
RelativeLayout.LayoutParams params = (LayoutParams) iv_drag_view.getLayoutParams();
params.leftMargin = lastx;
params.topMargin = lasty;
iv_drag_view.setLayoutParams(params);
iv_drag_view.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Log.i(TAG,"被点击了.");
if(firstClickTime>0){//说明这是第二次点击.long secondTime = System.currentTimeMillis();
long dtime = secondTime - firstClickTime;
if(dtime<500){
//双击事件.Log.i(TAG,"双击居中");
int iv_width = iv_drag_view.getRight() - iv_drag_view.getLeft();
iv_drag_view.layout(display.getWidth()/2-iv_width/2, iv_drag_view.getTop(), display.getWidth()/2+iv_width/2, iv_drag_view.getBottom());
int lasty = iv_drag_view.getTop();//得到最后在离屏幕上方的距离int lastx = iv_drag_view.getLeft();//得到最后离屏幕左边的距离Editor editor = sp.edit();
editor.putInt("lastx", lastx);
editor.putInt("lasty", lasty);
editor.commit();
}
firstClickTime = 0;//将第一次点击的时间还原成0。return;
} else {
//第一次点击
firstClickTime = System.currentTimeMillis();// 记录第一次点击的时间//新开一个线程，在这个子线程中如果是500毫秒内没有再点击就将第一次点击的时间设置为0new Thread(){
public void run() {
try {
Thread.sleep(500);
firstClickTime = 0;
} catch (InterruptedException e) {
e.printStackTrace();
}
};
}.start();
}
}
});
}
}6、触摸和双击同时发生时候的返回值
//onTouch方法的返回值，True if the listener has consumed the event, false otherwise,true 监听器会把这个事件给消费掉, false 不会消费掉这个事件
iv_drag_view.setOnTouchListener(new OnTouchListener() {
int startX , startY;
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:// 手指触摸到屏幕的事件Log.i(TAG,"摸到这个控件了");
startX = (int) event.getRawX();
startY = (int) event.getRawY();
break;
case MotionEvent.ACTION_MOVE:// 手指在屏幕上移动的事件Log.i(TAG,"移动");
int newX = (int) event.getRawX();
int newY = (int) event.getRawY();
int dx = newX - startX;
int dy = newY - startY;
int l = iv_drag_view.getLeft();
int r = iv_drag_view.getRight();
int b = iv_drag_view.getBottom();
int t = iv_drag_view.getTop();
int newl = l+dx;
int newr = r+dx;
int newt = t+dy;//imageview 在窗体中新的位置int newb = b+dy;
if(newl<0||newt < 0 ||newb>display.getHeight()-30||newr>display.getWidth()){
break;
}
int tv_height = tv_drag_view.getBottom() - tv_drag_view.getTop();
if(newt>display.getHeight()/2){//imageview在窗体的下方//textview在窗体的上方
tv_drag_view.layout(tv_drag_view.getLeft(), 0, tv_drag_view.getRight(), tv_height);
}else{
tv_drag_view.layout(tv_drag_view.getLeft(), display.getHeight()-tv_height-30, tv_drag_view.getRight(), display.getHeight()-30);
//textview在窗体的下方
}
iv_drag_view.layout(newl, newt, newr, newb);
//更新手指开始的位置.
startX = (int) event.getRawX();
startY = (int) event.getRawY();
break;
case MotionEvent.ACTION_UP: // 手指在离开屏幕的一瞬间对应的事件.Log.i(TAG,"放手");
int lasty = iv_drag_view.getTop();//得到最后在离屏幕上方的距离int lastx = iv_drag_view.getLeft();//得到最后离屏幕左边的距离Editor editor = sp.edit();
editor.putInt("lastx", lastx);
editor.putInt("lasty", lasty);
editor.commit();
break;
}
// 这里对于触摸事件应该是返回true为什么这里返回false呢，因为这里这一个控件同时实现了点击和触摸这两个事件，如果返回true，// 那么就不可能发生点击事件了，所以对于同时实现点击和触摸的控件返回值要为falsereturn false;
}
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