Android(安卓)图片自动切换
16lz
2021-01-26
Android 图片自动切换
效果图：
思路： 利用 android.support.v4.view.ViewPager 和线程实现图片切换。
1. 首先把图片放入分别放入不同的 ImageView
2.然后重写一下 ViewPager 的 适配器 PagerAdapter
3.然后重写一个实现更新界面等操作
4：在onStart里面切换图片
配置文件代码如下：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" > <FrameLayout android:layout_width="fill_parent" android:layout_height="200dip" > <android.support.v4.view.ViewPager android:id="@+id/vp" android:layout_width="match_parent" android:layout_height="match_parent" /> <LinearLayout android:layout_width="match_parent" android:layout_height="35dip" android:orientation="vertical" android:layout_gravity="bottom" android:gravity="center" android:background="#33000000" > <TextView android:id="@+id/tv_test_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="图片标题" android:textColor="@android:color/white" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" android:layout_marginTop="3dip" > <View android:id="@+id/dot_0" android:layout_width="5dip" android:layout_height="5dip" android:layout_marginLeft="2dip" android:layout_marginRight="2dip" android:background="@drawable/background" /> <View android:id="@+id/dot_1" android:layout_width="5dip" android:layout_height="5dip" android:layout_marginLeft="2dip" android:layout_marginRight="2dip" android:background="@drawable/background1" /> <View android:id="@+id/dot_2" android:layout_width="5dip" android:layout_height="5dip" android:layout_marginLeft="2dip" android:layout_marginRight="2dip" android:background="@drawable/background2" /> <View android:id="@+id/dot_3" android:layout_width="5dip" android:layout_height="5dip" android:layout_marginLeft="2dip" android:layout_marginRight="2dip" android:background="@drawable/background3" /> <View android:id="@+id/dot_4" android:layout_width="5dip" android:layout_height="5dip" android:layout_marginLeft="2dip" android:layout_marginRight="2dip" android:background="@drawable/background4" /> LinearLayout> LinearLayout> FrameLayout>RelativeLayout>java 文件为：
package androidstudio.android_test_ck;import android.os.Handler;import android.os.Message;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.TextView;import java.util.ArrayList;import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;public class MainTestActivity extends AppCompatActivity { private int imageIds[] = {R.drawable.background, R.drawable.background1, R.drawable.background2, R.drawable.background3, R.drawable.background4}; private ArrayList images = new ArrayList<>(); private ViewPager vp; private int oldPosition = 0;//记录上一次点的位置 private int currentItem; //当前页面 private ScheduledExecutorService scheduledExecutorService; //图片标题 private String titles[] = new String[]{"图片1", "图片2", "图片3", "图片4", "图片5"}; private ArrayList dots = new ArrayList();; private TextView title; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main_test); for (int i = 0; i < imageIds.length; i++) { ImageView imageView = new ImageView(this); imageView.setImageResource(imageIds[i]); images.add(imageView); } //显示的点 加入集合 dots.add(findViewById(R.id.dot_0)); dots.add(findViewById(R.id.dot_1)); dots.add(findViewById(R.id.dot_2)); dots.add(findViewById(R.id.dot_3)); dots.add(findViewById(R.id.dot_4)); //获取图片标题的id title = (TextView) findViewById(R.id.tv_test_title); //获取ViewPager 的id vp = (ViewPager) findViewById(R.id.vp); vp.setAdapter(new ViewPagerAdapter()); vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { //设置页面刷新后的图片标题 title.setText(titles[position]); oldPosition = position; currentItem = position; } @Override public void onPageScrollStateChanged(int state) { } }); } class ViewPagerAdapter extends PagerAdapter{ @Override public int getCount() { return images.size(); } @Override public boolean isViewFromObject(View view, Object object) { return view==object; } @Override public void destroyItem(ViewGroup container, int position, Object object) { //将试图移除试图组 View v =images.get(position); container.removeView(v); } @Override public Object instantiateItem(ViewGroup container, int position) { //将试图添加进试图组 View v =images.get(position); container.addView(v); return v; } } @Override protected void onStart() { super.onStart(); scheduledExecutorService = Executors.newSingleThreadScheduledExecutor(); //每隔两秒换一张图片 scheduledExecutorService.scheduleWithFixedDelay(new ViewPagerTask(),2,2, TimeUnit.SECONDS); } //实现一个碎片的接口 class ViewPagerTask implements Runnable{ @Override public void run() { currentItem = (currentItem+1)%imageIds.length; //更新界面 handler.obtainMessage().sendToTarget(); } } //在handler进行碎片跳转 Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { vp.setCurrentItem(currentItem); } };} 更多相关文章
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