模仿Toast实现提示框

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模仿Toast实现提示框

Toast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

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。

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_WINDOWparams.type = WindowManager.LayoutParams.TYPE_PRIORITY_PHONE; wm.addView(view, params);

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;        }    });}

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);

实现双击事件

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
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();                }                           }        });    }}

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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