Java 定期更改图像视图
我希望我的图像视图在4秒钟内周期性地改变,我照做了,但是代码不起作用 图像视图出现在emulator中,但图像不会间歇性更改。我已经附上了我的Java代码和XML文件Java 定期更改图像视图,java,android,imageview,Java,Android,Imageview,我希望我的图像视图在4秒钟内周期性地改变,我照做了,但是代码不起作用 图像视图出现在emulator中,但图像不会间歇性更改。我已经附上了我的Java代码和XML文件 /* Java Code*/ package com.serverphone.healthyfoods; import android.content.Intent; import android.os.Bundle; import android.support.design.widget.FloatingActionBut
/* Java Code*/
package com.serverphone.healthyfoods;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.logging.Handler;
import java.util.logging.LogRecord;
public class Menu1 extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
ImageView iv;
TextView tv;
int i = 0;
int imageArray[] = {R.drawable.chicken_curry1,R.drawable.chicken_biriyani,R.drawable.paneer_butter};
String textArray[] = {"Chicken curry","Chicken Biriyani","Paneer Butter Masala"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu1);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle("Main Menu");
tv=(TextView)findViewById(R.id.info_text);
iv=(ImageView)findViewById(R.id.image);
Runnable r = new Runnable() {
@Override
public void run() {
iv.setImageResource(imageArray[i]);
i++;
if(i >= imageArray.length)
i=0;
//iv.postDelayed(r,4000);
}
};
iv.postDelayed(r,4000);
/*FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});*/
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu1, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.iov) {
// Handle the camera action
Intent i=new Intent(Menu1.this,InstantOrderVeg.class);
startActivity(i);
} else if (id == R.id.ionv) {
Intent i=new Intent(Menu1.this,InstantOrderNveg.class);
startActivity(i);
} else if (id == R.id.alaca) {
Intent i=new Intent(Menu1.this,AlaCarte.class);
startActivity(i);
} else if (id == R.id.cater) {
Intent i=new Intent(Menu1.this,Catering.class);
startActivity(i);
} else if (id == R.id.cont) {
Intent i=new Intent(Menu1.this,ContactUs.class);
startActivity(i);
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
<!-- XML file-->
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/app_bar_menu1" tools:context="com.serverphone.healthyfoods.Menu1">
<android.support.v7.widget.CardView
android:id="@+id/card_view"
card_view:cardElevation="10dp"
android:layout_centerHorizontal="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
card_view:cardBackgroundColor="#E8EAF6"
card_view:cardCornerRadius="4dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/info_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="\t\t\t\t\t\t\t\t\t\tChicken Curry"
android:textSize="30dp"
android:textStyle="italic"
/>
<ImageView
android:id="@+id/image"
android:layout_below="@id/info_text"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_marginTop="20dp"
android:scaleType="fitXY"
android:src="@drawable/chicken_curry1"/>
</RelativeLayout>
</android.support.v7.widget.CardView>
</RelativeLayout>
/*Java代码*/
包com.serverphone.healthyfoods;
导入android.content.Intent;
导入android.os.Bundle;
导入android.support.design.widget.FloatingActionButton;
导入android.support.design.widget.Snackbar;
导入android.view.view;
导入android.support.design.widget.NavigationView;
导入android.support.v4.view.GravityCompat;
导入android.support.v4.widget.DrawerLayout;
导入android.support.v7.app.ActionBarDrawerToggle;
导入android.support.v7.app.AppActivity;
导入android.support.v7.widget.Toolbar;
导入android.view.Menu;
导入android.view.MenuItem;
导入android.widget.ImageView;
导入android.widget.TextView;
导入java.util.logging.Handler;
导入java.util.logging.LogRecord;
公共类Menu1扩展AppCompatActivity实现NavigationView.OnNavigationItemSelectedListener{
ImageView iv;
文本视图电视;
int i=0;
int imageArray[]={R.drawable.chicken\u curry1,R.drawable.chicken\u biriyani,R.drawable.paneer\u butter};
字符串textary[]={“鸡肉咖喱”、“鸡肉比里亚尼”、“Paneer Butter Masala”};
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu1);
Toolbar Toolbar=(Toolbar)findViewById(R.id.Toolbar);
设置支持操作栏(工具栏);
getSupportActionBar().setTitle(“主菜单”);
tv=(TextView)findViewById(R.id.info\u text);
iv=(ImageView)findViewById(R.id.image);
Runnable r=新的Runnable(){
@凌驾
公开募捐{
iv.setImageResource(imageArray[i]);
i++;
如果(i>=imageArray.length)
i=0;
//iv.延迟(r,4000);
}
};
iv.延迟(r,4000);
/*FloatingActionButton fab=(FloatingActionButton)findViewById(R.id.fab);
fab.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图){
Snackbar.make(查看“替换为您自己的操作”,Snackbar.LENGTH\u LONG)
.setAction(“Action”,null).show();
}
});*/
抽屉布局抽屉=(抽屉布局)findViewById(R.id.抽屉布局);
ActionBarDrawerToggle切换=新建ActionBarDrawerToggle(
这,抽屉,工具栏,R.string.navigation\u drawer\u open,R.string.navigation\u drawer\u close);
抽屉。设置抽屉定位器(开关);
toggle.syncState();
NavigationView NavigationView=(NavigationView)findViewById(R.id.nav_视图);
navigationView.setNavigationItemSelectedListener(此);
}
@凌驾
public void onBackPressed(){
抽屉布局抽屉=(抽屉布局)findViewById(R.id.抽屉布局);
if(抽屉isDrawerOpen(重力压缩机启动)){
抽屉。关闭抽屉(重力压缩机启动);
}否则{
super.onBackPressed();
}
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(R.menu.menu1,菜单);
返回true;
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
//处理操作栏项目单击此处。操作栏将
//自动处理Home/Up按钮上的点击,只要
//在AndroidManifest.xml中指定父活动时。
int id=item.getItemId();
//noinspection SimplifiableIf语句
if(id==R.id.action\u设置){
返回true;
}
返回super.onOptionsItemSelected(项目);
}
@SuppressWarnings(“StatementWithEmptyBody”)
@凌驾
公共布尔值onNavigationItemSelected(MenuItem项){
//处理导航视图项单击此处。
int id=item.getItemId();
if(id==R.id.iov){
//处理相机的动作
Intent i=新Intent(Menu1.this,InstantOrderVeg.class);
星触觉(i);
}else if(id==R.id.ionv){
Intent i=新Intent(Menu1.this,InstantOrderNveg.class);
星触觉(i);
}else if(id==R.id.alaca){
意图i=新意图(Menu1.this,AlaCarte.class);
星触觉(i);
}else if(id==R.id.cate){
意向i=新意向(菜单1.this,Catering.class);
星触觉(i);
}else if(id==R.id.cont){
意向i=新意向(Menu1.this,ContactUs.class);
星触觉(i);
}
抽屉布局抽屉=(抽屉布局)findViewById(R.id.抽屉布局);
抽屉。关闭抽屉(重力压缩机启动);
返回true;
}
}
第一次从oncreate()启动
}`
Runnable changeImage=new Runnable(){
}) 尝试使用。它允许在线程中轻松地进行UI更改。这可能会对您有所帮助。尝试在runnable()中调用
requestLayout
对语句“iv.postDelated(r,4000);”进行注释,因此从注释中删除它可能会有所帮助。当我删除该注释行时,它会显示一个错误:“变量r是从内部类中声明的,需要声明为final”,当我声明它为final时,它说它必须被初始化。
public void onCreate(Bundle b){
handler.postDelayed(changeImage, 1000);
Handler handler = new Handler();
@Override
public void run(){
if(flag>1)
handler.removeCallbacks(changeImage);
else{
iv.setImageResource(v[flag++]);
handler.postDelayed(changeImage, 1000);
}
}