Android模仿Toast实现提示框效果
作者:Scofield_Phil
本文实例为大家分享了Android模仿Toast实现提示框效果的具体代码,供大家参考,具体内容如下
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
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; } });
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。