Android 实现按钮在没有触摸事件时几秒钟之后自动隐藏
实现按钮在没有触摸事件时几秒钟之后自动隐藏
大概意思就是用一个线程来控制时间。
下面我实现一个Button的自动隐藏
获取控件
mButton = (Button)findViewById(R.id.btn);
控件的隐藏需要有一个Handler机制监听消息和发送消息
class MyHandler extends Handler{
//发送消息的id
private final int MSG_HIDE = 0x001;
//WeakReference垃圾回收机制
privateWeakReference
public MyHandler(MainActivitypMainActivity){
weakRef = newWeakReference
}
@Override
public void handleMessage(Message msg) {
final MainActivity mainActivity = weakRef.get();
if (mainActivity != null) {
switch (msg.what) {
case MSG_HIDE:
mainActivity.hide();
break;
}
}
super.handleMessage(msg);
}
/**
* 发送消息
*/
public void sendHideControllMessage(){
obtainMessage(MSG_HIDE).sendToTarget();
}
然后需要开启一个新的线程，控制按钮的定时隐藏
private class CountTimeThread extends Thread{
private final long maxVisibleTime ;
private long startVisibleTime;
/**
* 设置控件显示时间second单位是秒
* @param second
*/
public CountTimeThread(int second){
maxVisibleTime = second * 1000;//换算为毫秒
setDaemon(true);//设置为后台进程
}
/**
* 如果用户有操作，则重新开始计时隐藏时间
*/
private synchronized void reset() {
startVisibleTime = System.currentTimeMillis();
}
@Override
public void run() {
startVisibleTime = System.currentTimeMillis();//初始化开始时间
while (true) {
//如果时间达到最大时间，则发送隐藏消息
if (startVisibleTime + maxVisibleTime < System.currentTimeMillis()){
mHandler.sendHideControllMessage();
startVisibleTime = System.currentTimeMillis();
}
try {
Thread.sleep(1000);
} catch (Exception e) {
}
}
}
}
然后需要一个开启线程的方法
private void startCountTimeThread(){
countTimeThread = new CountTimeThread(2);
countTimeThread.start();
}
重写触摸监听，如果有触摸事件发送，则需要重置显示的时间
@Override
public boolean onTouchEvent(MotionEvent event) {
countTimeThread.reset();//重置时间
if (event.getAction() == MotionEvent.ACTION_DOWN) {
boolean isVisible = (mButton.getVisibility() == View.VISIBLE);
if (!isVisible) {
mButton.setVisibility(View.VISIBLE);
return true;
}
}
return super.onTouchEvent(event);
}
全部代码如下：
import java.lang.ref.WeakReference;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
public classMainActivity extends ActionBarActivity {
ButtonmButton;
MyHandlermHandler= newMyHandler(MainActivity.this);
CountTimeThreadcountTimeThread;
@Override
protectedvoidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mButton = (Button) findViewById(R.id.btn);
startCountTimeThread();
}
//如果有触摸事件，，则重置显示时间
@Override
publicbooleanonTouchEvent(MotionEvent event) {
countTimeThread.reset();//重置时间
if (event.getAction() == MotionEvent.ACTION_DOWN) {
boolean isVisible = (mButton.getVisibility() ==View.VISIBLE);
if (!isVisible) {
mButton.setVisibility(View.VISIBLE);
return true;
}
}
return super.onTouchEvent(event);
}
/**
* 开启监听控件隐藏的线程
*/
privatevoidstartCountTimeThread(){
countTimeThread = new CountTimeThread(2);
countTimeThread.start();
}
/**
* 隐藏需要隐藏的按钮
*/
privatevoidhide(){
if (mButton.getVisibility() == View.VISIBLE) {
mButton.setVisibility(View.GONE);
}
}
/**
* Handler消息传递机制
*/
classMyHandler extendsHandler{
//发送消息的id
private final int MSG_HIDE= 0x001;
//WeakReference垃圾回收机制
private WeakReference
public MyHandler(MainActivity pMainActivity){
weakRef = newWeakReference
}
@Override
public void handleMessage(Message msg) {
final MainActivity mainActivity = weakRef.get();
if (mainActivity != null) {
switch (msg.what) {
case MSG_HIDE:
mainActivity.hide();
break;
}
}
super.handleMessage(msg);
}
/**
* 发送消息
*/
public void sendHideControllMessage(){
obtainMessage(MSG_HIDE).sendToTarget();
}
}
/**
* 用进程监听按钮控件的显示时间，定时隐藏
* @author zxl
*
*/
privateclassCountTimeThread extends Thread{
private final long maxVisibleTime;
private long startVisibleTime;
/**
* 设置控件显示时间 second单位是秒
* @param second
*/
public CountTimeThread(int second){
maxVisibleTime = second * 1000;//换算为毫秒
setDaemon(true);//设置为后台进程
}
/**
* 如果用户有操作，则重新开始计时隐藏时间
*/
private synchronized void reset() {
startVisibleTime = System.currentTimeMillis();
}
@Override
public void run() {
startVisibleTime = System.currentTimeMillis();//初始化开始时间
while (true) {
//如果时间达到最大时间，则发送隐藏消息
if (startVisibleTime + maxVisibleTime < System.currentTimeMillis()){
mHandler.sendHideControllMessage();
startVisibleTime = System.currentTimeMillis();
}
try {
Thread.sleep(1000);
}catch(Exception e) {
}
}
}
}
}