本篇文章给大家分享的是有关Android开发中怎么显示一个九宫格图片，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。
具体方法如下：
public abstract class NineGridAdapter {
protected Context context;
protected List list;
public NineGridAdapter(Context context, List list) {
this.context = context;
this.list = list;
}
public abstract int getCount();
public abstract String getUrl(int positopn);
public abstract Object getItem(int position);
public abstract long getItemId(int position);
public abstract View getView(int i, View view);
}package com.wd.weidologin.pic;
import android.content.Context;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
public class NineGridlayout extends ViewGroup {
private NineGridAdapter adapter;
private OnItemClickListerner onItemClickListerner;
// 行间距
private int lineSpace;
//列间距
private int gap;
private final int DEFAULT_WIDTH = 140;
private int columns;//
private int rows;//
private int totalWidth;
private Context context;
int singleWidth = 0, singleHeight = 0;
private int defaultWidth, defaultHeight;
private int oldCount;
public NineGridlayout(Context context) {
this(context, null);
}
public NineGridlayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public NineGridlayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.context = context;
gap = dip2px(context, 10);
lineSpace = dip2px(context,10);
ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
defaultWidth = defaultHeight = dip2px(context, DEFAULT_WIDTH);
}
public void setDefaultWidth(int defaultWidth) {
this.defaultWidth = defaultWidth;
}
public void setDefaultHeight(int defaultHeight) {
this.defaultHeight = defaultHeight;
}
public void setAdapter(NineGridAdapter adapter) {
this.adapter = adapter;
if (adapter == null) {
return;
}
//初始化布局形状
generateChildrenLayout(adapter.getCount());
//这里做一个重用view的处理
// if (oldCount == 0) {
removeAllViews();
for (int i = 0; i < adapter.getCount(); i++) {
View itemView = adapter.getView(i, null);
addView(itemView, generateDefaultLayoutParams());
}
// }
/*else {
//以前添加过view
int newViewCount = adapter.getCount();
if (oldCount > newViewCount) {
removeViews(newViewCount - 1, oldCount - newViewCount);
for (int i = 0; i < newViewCount - 1; i++) {
adapter.getView(i, getChildAt(i));
}
} else if (oldCount < newViewCount) {
for (int i = 0; i < newViewCount - oldCount; i++) {
View itemView = adapter.getView(i, null);
addView(itemView, generateDefaultLayoutParams());
}
}
}*/
oldCount = adapter.getCount();
requestLayout();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
totalWidth = sizeWidth - getPaddingLeft() - getPaddingRight();
if (adapter != null && adapter.getCount() > 0) {
int measureWidth, measureHeight;
int childrenCount = adapter.getCount();
if (childrenCount == 1) {
singleWidth = defaultWidth;
singleHeight = defaultHeight;
} else {
singleWidth = (totalWidth - gap * (3 - 1)) / 3;
singleHeight = singleWidth;
}
measureChildren(MeasureSpec.makeMeasureSpec(singleWidth, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(singleHeight, MeasureSpec.EXACTLY));
measureWidth = singleWidth * columns + gap * (columns - 1);
measureHeight = singleHeight * rows + lineSpace * (rows - 1);
setMeasuredDimension(sizeWidth, measureHeight);
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
layoutChildrenView();
}
private void layoutChildrenView() {
if (adapter == null || adapter.getCount() == 0) {
return;
}
int childrenCount = adapter.getCount();
for (int i = 0; i < childrenCount; i++) {
int[] position = findPosition(i);
int left = (singleWidth + gap) * position[1] + getPaddingLeft();
int top = (singleHeight + lineSpace) * position[0] + getPaddingTop();
int right = left + singleWidth;
int bottom = top + singleHeight;
ImageView childrenView = (ImageView) getChildAt(i);
if (childrenCount == 1) {
//只有一张图片
childrenView.setScaleType(ImageView.ScaleType.FIT_CENTER);
} else {
childrenView.setScaleType(ImageView.ScaleType.CENTER_CROP);
}
final int itemPosition = i;
childrenView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (onItemClickListerner != null) {
onItemClickListerner.onItemClick(v, itemPosition);
}
}
});
childrenView.layout(left, top, right, bottom);
}
}
private int[] findPosition(int childNum) {
int[] position = new int[2];
for (int i = 0; i < rows; i++) {
for (int j = 0; j < columns; j++) {
if ((i * columns + j) == childNum) {
position[0] = i;//行
position[1] = j;//列
break;
}
}
}
return position;
}
public int getGap() {
return gap;
}
public void setGap(int gap) {
this.gap = gap;
}
/**
* 根据图片个数确定行列数量
* 对应关系如下
* num row column
* 1 1 1
* 2 1 2
* 3 1 3
* 4 2 2
* 5 2 3
* 6 2 3
* 7 3 3
* 8 3 3
* 9 3 3
*
* @param length
*/
private void generateChildrenLayout(int length) {
if (length <= 3) {
rows = 1;
columns = length;
} else if (length <= 6) {
rows = 2;
columns = 3;
if (length == 4) {
columns = 2;
}
} else {
rows = 3;
columns = 3;
}
}
/**
* dp to px
*/
public static int dip2px(Context context, double dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
public void setOnItemClickListerner(OnItemClickListerner onItemClickListerner) {
this.onItemClickListerner = onItemClickListerner;
}
public interface OnItemClickListerner {
public void onItemClick(View view, int position);
}
}package com.wd.weidologin.home;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.Toast;
import com.bumptech.glide.Glide;
import com.google.gson.Gson;
import com.wd.weidologin.R;
import com.wd.weidologin.adapter.AttentionRequestAdapter;
import com.wd.weidologin.okutil.okRE;
import com.wd.weidologin.pic.NineGridAdapter;
import com.wd.weidologin.pic.NineGridlayout;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class MainActivity2 extends AppCompatActivity {
private RecyclerView ry;
private AttentionRequestAdapter attentionRequestAdapter;
private ArrayList<CircleBean.ResultEntity> lists=new ArrayList<>();
private NineGridlayout mGV;
private CircleBean.ResultEntity result;
private String picture;
private List<String> list = new ArrayList<String>();
private Adapter adapter;
public static final String ACTION ="com.example.casts";
private String msg;
private SharedPreferences canfig;
private SharedPreferences.Editor edited;
private String imageUrl = "http://pic1.nipic.com/2008-09-08/200898163242920_2.jpg";//如果没有接口可以用这个简单代替这个就不需要进行切割了
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
init();//（有接口的情况）
list.add(imageUrl);//没有接口的情况 ---====================
if (adapter == null){
adapter = new Adapter(this,list);
mGV.setAdapter(adapter);
}
mGV.setOnItemClickListerner(new NineGridlayout.OnItemClickListerner() {
@Override
public void onItemClick(View view, int position) {
Toast.makeText(getApplicationContext(), String.valueOf(position),Toast.LENGTH_LONG).show();
}
});//没有接口的情况 ---====================不要混
}
private void init() {
// int sickCircleId = getIntent().getIntExtra("sickCircleId", 0);
canfig = getSharedPreferences("canfig", Context.MODE_PRIVATE);
edited = canfig.edit();
int resultkey = canfig.getInt("resultkey", 0);
String url="http:....."+resultkey;
HashMap<String, String> headmap = new HashMap<>();
headmap.put("userId","287");
headmap.put("sessionId","1604985492394287");
okRE.getInstance().getCircledetails(url,headmap, new okRE.NetCallBack() {
@Override
public void onSuccess(String string) {
CircleBean circleBean = new Gson().fromJson(string, CircleBean.class);
picture = circleBean.getResult().getPicture();
Toast.makeText(MainActivity2.this, picture+"", Toast.LENGTH_SHORT).show();
mGV = findViewById(R.id.d);
String[] split = picture.split(",");//一般多图上传后需要将图片进行切割
if (picture.equals("")){//在这里我进行了是否有图片的判断以免没有图片还进行占位
mGV.setVisibility(View.GONE);
}
for (int i = 0; i < split.length; i++) {
list.add(split[i]);
}
if (adapter == null){
adapter = new Adapter(MainActivity2.this,list);
mGV.setAdapter(adapter);
}
mGV.setOnItemClickListerner(new NineGridlayout.OnItemClickListerner() {图片点击事件
@Override
public void onItemClick(View view, int position) {
Toast.makeText(getApplicationContext(), String.valueOf(position),Toast.LENGTH_LONG).show();
}
});
}
@Override
public void onFail(String string) {
// Toast.makeText(MainActivity.this, string+"", Toast.LENGTH_SHORT).show();
}
});
}
private class Adapter extends NineGridAdapter {//适配器
public Adapter(Context context, List list){
super(context,list);
}
@Override
public int getCount() {
return list == null?0:list.size();
}
@Override
public String getUrl(int positon) {
return getItem(positon) == null ? null : getItem(positon).toString();
}
@Override
public Object getItem(int position) {
return (list == null) ? null : list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int i, View view) {
ImageView imageView = new ImageView(getApplicationContext());
ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setBackgroundColor(Color.parseColor("#f5f5f5"));
imageView.setLayoutParams(lp);
Glide.with(context).load(getUrl(i)).into(imageView);
return imageView;
}
}
}最后因为这个包含网络请求所以需要进行设置
在res下创建xml文件夹创建network_security_config.xml
<?xml version="1.0" encoding="utf-8"?> <network-security-config> <base-config cleartextTrafficPermitted="true" /> </network-security-config>
放到
并且添加网络权限
<uses-permission android:name="android.permission.INTERNET" />
以上就是Android开发中怎么显示一个九宫格图片，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注亿速云行业资讯频道。
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