fragment中的ImagView+Text多條目,點選ImageView二次取樣切換相簿圖片
##Fragmentd的 XML:
<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout
xmlns:android=“http://schemas.android.com/apk/res/android” android:layout_width=“match_parent”
android:layout_height=“match_parent”>
</android.support.constraint.ConstraintLayout>
二次取樣寫入到工具類中:
package com.example.work09_07;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.AsyncTask;
import android.provider.MediaStore;
import android.support.v4.content.CursorLoader;
import com.google.gson.Gson;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class NetUntil {
private static NetUntil instance;
private NetUntil(){
} public static NetUntil getInstance(){ if (instance==null){ instance=new NetUntil(); } return instance; } //1.根據相簿路徑得到真實路徑 public String geturi(Context con,Uri uri){ String[] strings={MediaStore.Images.Media.DATA}; CursorLoader loader = new CursorLoader(con, uri, strings, null, null, null); Cursor cursor = loader.loadInBackground(); int indexOrThrow = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst(); return cursor.getString(indexOrThrow); } //2.根據真實路徑進行二次取樣 public Bitmap getBit(Context con,Uri uri,int weidth,int height){ BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds=true; String geturi = geturi(con, uri); BitmapFactory.decodeFile(geturi,options); int outWidth = options.outWidth; int outHeight = options.outHeight; options.inSampleSize=Math.max(outWidth/weidth,outHeight/height); options.inJustDecodeBounds=false; Bitmap bitmap = BitmapFactory.decodeFile(geturi, options); return bitmap; } public interface Callback<T> { void onSuccess(T t); } //非同步任務 public void getRequest(String lujing, final Class clazz, final Callback callBack) { new AsyncTask<String, Void, Object>() { @Override protected Object doInBackground(String... strings) { return getRequest(strings[0], clazz); } @Override protected void onPostExecute(Object o) { callBack.onSuccess(o); } }.execute(lujing); } //網路解析 public <T> T getRequest(String urlPath, Class clazz) { T t = (T) new Gson().fromJson(getRequest(urlPath), clazz); return t; } //網路請求 public String getRequest(String urlPath) { String result = ""; try { //定義地址 URL url = new URL(urlPath); //開啟連線 HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); //請求方法 urlConnection.setRequestMethod("GET"); //讀取超時 urlConnection.setReadTimeout(5000); //連線超時 urlConnection.setConnectTimeout(5000); if (urlConnection.getResponseCode() == 200) { result = stream2String(urlConnection.getInputStream()); } } catch (Exception e) { e.printStackTrace(); } //return null; return result; } //位元組流轉換為字元流 private String stream2String(InputStream inputStream) throws IOException { InputStreamReader inputStreamReader = new InputStreamReader(inputStream); BufferedReader buff = new BufferedReader(inputStreamReader); StringBuilder builder = new StringBuilder(); for (String tmp = buff.readLine(); tmp != null; tmp = buff.readLine()) { builder.append(tmp); } return builder.toString(); }
}
Fragment:
package com.example.work09_07;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;
import com.example.work09_07.Adapter.Left_Adapter;
public class LeftFragment extends Fragment {
//獲取資源ID
private ListView listView;
private Left_Adapter adapter;
private Uri uri;//從相簿中得到圖片的路徑
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
//有圖片和條目
View view=inflater.inflate(R.layout.leftfragment,container,false);
return view;
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
listView=view.findViewById(R.id.left_listview);
//條目點選,viewpager跳轉到互動的fragment
//通過Activity聯絡
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView <?> parent, View view, int position, long id) {
if (position == 0) {
//對圖片進行切換
//1.從相簿獲取圖片
Intent it = new Intent(Intent.ACTION_PICK);
it.setType("image/*");
startActivityForResult(it,100);
}
// else { //position為側拉的
// ((MainActivity) getActivity()).getData(position - 1);
// }
}
});
//介面卡
adapter=new Left_Adapter(getActivity());
listView.setAdapter(adapter);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Toast.makeText(getActivity(),“12”,Toast.LENGTH_LONG).show();
if (requestCode100&&resultCodegetActivity().RESULT_OK){
Uri uri = data.getData();
//2.二次取樣
Bitmap bit = NetUntil.getInstance().getBit(getActivity(), uri, 100, 100);
adapter.getImage(bit);
return;
}
}
}
Fragment的介面卡:
package com.example.work09_07.Adapter;
import android.content.Context;
import android.graphics.Bitmap;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.work09_07.R;
public class Left_Adapter extends BaseAdapter {
private Context con;
private String[] menus=new String[]{“我的”,“視訊”,“遊戲”};
private Bitmap bit;
public Left_Adapter(Context con) {
this.con = con;
}
//多條目
@Override
public int getViewTypeCount() {
return 2;
}
@Override
public int getItemViewType(int position) {
return position==0?0:1;
}
//傳遞引數
public void getImage(Bitmap bit){
this.bit=bit;
notifyDataSetChanged();
}
@Override
public int getCount() {
return menus.length+1;
}
@Override
public String getItem(int position) {
if (position==0){
return null;
}
return menus[position-1];
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView==null){
convertView=LayoutInflater.from(con)
.inflate(getItemViewType(position)==0? R.layout.has_image:R.layout.no_image,parent,false);
holder=new ViewHolder();
holder.textView=convertView.findViewById(R.id.no_textview);
holder.imageView=convertView.findViewById(R.id.has_image);
convertView.setTag(holder);
}else {
holder= (ViewHolder) convertView.getTag();
}
//記住!!!!!!!!要判斷
if (getItemViewType(position)==1){
holder.textView.setText(getItem(position));
}else if (getItemViewType(position)==0){
if (bit!=null){
holder.imageView.setImageBitmap(bit);
}
}
return convertView;
}
class ViewHolder{
ImageView imageView;
TextView textView;
}
}