android網路請求的圖片輪播效果
阿新 • • 發佈：2019-02-15
我們首先畫小圓點我們在res-drawable 資料夾下首先我們建立 別如果是當前的圖片是紅色
shape_select.xml檔案
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval"> <corners android:radius="2dp"/> <solid android:color="@color/colorAccent"/> </shape>
第二個畫小圓點我們在res-drawable 資料夾下首先我們建立 別如果是當前的圖片是藍色
shape_notxml.xml檔案
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval"> <corners android:radius="2dp"/> <solid android:color="@color/colorPrimary"/> </shape>
接下來我們就在activity-main 佈局檔案中寫入ViewPager 控和小圓點的佈局空間
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="test.bwie.com.wzq_lunbo.MainActivity"> <android.support.v4.view.ViewPager android:layout_width="match_parent" android:layout_height="150dp" android:id="@+id/vp"></android.support.v4.view.ViewPager> <LinearLayout android:orientation="horizontal" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/linear" android:layout_centerHorizontal="true" android:layout_alignBottom="@id/vp" android:layout_marginBottom="25dp"></LinearLayout> <com.limxing.xlistview.view.XListView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/xlistview" android:layout_below="@id/vp"></com.limxing.xlistview.view.XListView> </RelativeLayout>
主要的我們還有對圖片的快取 使用的是Imagerloader對網路圖片快取 點選藍色字型進行檢視。
好了以上操作完成之後我們就要對MainActivity類進行操作了
package test.bwie.com.wuzeqiang1507d20170825;
import android.os.AsyncTask;
import android.os.Bundle;
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.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;
import com.google.gson.Gson;
import com.limxing.xlistview.view.XListView;
import com.nostra13.universalimageloader.core.ImageLoader;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Arrays;
import java.util.List;
public class MainActivity extends AppCompatActivity{
private ViewPager vp;
private LinearLayout linear;
private List<String> imagelist;
private int currentindext=0;
private int oldindext=0;
Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
vp.setCurrentItem(currentindext);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
InitData();
//做適配
vp.setAdapter(new myPager());
//呼叫執行緒中做無限迴圈
autoplay();
init();
getdata();
}
/**
* vViewpager 新增小圓點
* 做監聽事件
*/
private void init() {
//做對應相同圖片的小圓點
for ( int i =0;i<imagelist.size();i++){
//自己定義的檢視空間
View img = new View(MainActivity.this);
//檢視的長和寬
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(30,30);
//左間距
params.leftMargin=10;
//右間距
params.rightMargin=10;
img.setLayoutParams(params);
if(i==0){
img.setBackgroundResource(R.drawable.shape_select);
}else{
img.setBackgroundResource(R.drawable.shape_notxml);
}
//填充給Linearlayout 控制元件中
linear.addView(img);
}
//對viewpager 做滑動監聽
vp.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
//當前的介面是成功的 紅色的小圓點
linear.getChildAt(position % imagelist.size()).setBackgroundResource(R.drawable.shape_select);
//當前介面不是的顯示的圖片的時候就 藍色的小圓點
linear.getChildAt(oldindext %imagelist.size()).setBackgroundResource(R.drawable.shape_notxml);
oldindext=position;
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
//初始化控制元件的iD
private void InitData() {
vp = (ViewPager) findViewById(R.id.vp);linear = (LinearLayout) findViewById(R.id.linear);
//網路快取的圖片地址
imagelist = Arrays.asList("http://p2.so.qhmsg.com/bdr/_240_/t01e8378dd608d74de7.jpg",
"http://p0.so.qhmsg.com/bdr/_240_/t0137613c27d5b716a5.jpg",
"http://p4.so.qhimgs1.com/bdr/_240_/t01b03cca59569f456a.jpg",
"http://p2.so.qhimgs1.com/bdr/_240_/t01ebd4aba75daf1cee.jpg"
);
}
/**
* 線上程中做無限迴圈
* 通過handler 更新主執行緒UI
*/
private void autoplay(){
new Thread(){
@Override
public void run() {
while (true){
try {
currentindext++;
Thread.sleep(3000);
handler.sendEmptyMessage(0);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}.start();
}
//viewpager做適配
class myPager extends PagerAdapter{
@Override
public int getCount() {
return Integer.MAX_VALUE;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view==object;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView image = new ImageView(MainActivity.this);
ImageLoader.getInstance().displayImage(imagelist.get(position %imagelist.size()),image,Myapplication.GetOptios());
container.addView(image);
return image;
}
}
}