Android在子线程当中更新UI界面（TextView、ImageView）
16lz
2021-12-23
上次写了Android上调用百度人脸识别接口
但是只写到获取JSON字符串，在log当中打印，没有更新UI界面
这次简单写一下Android在子线程当中更新UI界面（TextView、ImageView）
这次调用的本地服务器接口，将图片上传到服务器中，返回JSON解析后再展示
通过Message传递消息给Handler更新界面
MessgActivity
package ss.demo16;import android.Manifest;import android.annotation.TargetApi;import android.content.ContentUris;import android.content.Intent;import android.content.pm.PackageManager;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.net.Uri;import android.os.Build;import android.os.Handler;import android.os.Message;import android.provider.DocumentsContract;import android.provider.MediaStore;import android.support.v4.app.ActivityCompat;import android.support.v4.content.ContextCompat;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.text.TextUtils;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;import com.alibaba.fastjson.JSONObject;import java.io.File;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import static android.speech.tts.TextToSpeech.ERROR;/* *@Author:Swallow *@Date:2018/01/12 */public class MessgActivity extends AppCompatActivity implements View.OnClickListener { public Button addph, putmes; public ImageView ivphoto; public TextView tvnum; public static final int SELECT_PHOTO = 2; public String path = null; private int num; private Bitmap orc_bitmap; private ListView showlv; private Handler handler = new Handler(){ public void handleMessage(Message msg) { if(msg.what == 1){ Bitmap bitmap = (Bitmap)msg.obj; ivphoto.setImageBitmap(bitmap); }else if(msg.what == ERROR){ Toast.makeText(MessgActivity.this,"显示图片错误",Toast.LENGTH_SHORT).show(); }else if(msg.what == 2){ tvnum = (TextView)findViewById(R.id.tv_num) ; tvnum.setText((String) msg.obj); } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_messg); addph = (Button) findViewById(R.id.add_photo); putmes = (Button) findViewById(R.id.b_check); addph.setOnClickListener(this); putmes.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { //添加一张照片，获取照片路径显示到控件上面，并且把路径值传给接口 case R.id.add_photo: //判断权限是否打开 if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1); } *else { openAlbum();//打开相册 } break; case R.id.b_check: if(path!=null){ new Thread(new Runnable() { @Override public void run() { HttpURLConnection conn = null; try{ File file = new File(path); String result = UploadUtil.uploadImage(file, "服务器url"); Log.v("mes",result); String objlist = JSONObject.parseObject(result).getString("obj"); String urlist = JSONObject.parseObject(objlist).getString("imageUrl"); String num = JSONObject.parseObject(objlist).getString("faceNum"); String url = JSONObject.parseObject(urlist).getString("outputImageUrl"); Log.v("mes",num); Log.v("mes",url); Message msg = new Message(); msg.what = 2; msg.obj = num; handler.sendMessage(msg); //通过图片的url显示图片 URL imgurl = new URL(url); conn = (HttpURLConnection)imgurl.openConnection(); conn.setRequestMethod("GET"); conn.setConnectTimeout(5000); int code = conn.getResponseCode(); if(code == 200){ InputStream is = conn.getInputStream(); Bitmap bitmap = BitmapFactory.decodeStream(is); msg = new Message(); msg.what = 1; msg.obj = bitmap; handler.sendMessage(msg); }else { msg = new Message(); msg.what = ERROR; handler.sendMessage(msg); } }catch (Exception e) { e.printStackTrace(); Message msg = new Message(); msg.what = ERROR; handler.sendMessage(msg); } conn.disconnect(); } }).start(); } break; } } private void openAlbum () { Intent intent = new Intent("android.intent.action.GET_CONTENT"); intent.setType("image/*"); startActivityForResult(intent, SELECT_PHOTO); } //@TargetApi(Build.VERSION_CODES.KITKAT) private void handleImgeOnKitKat (Intent data){ //String imagePath = null; Uri uri = data.getData(); Log.d("uri=intent.getData :", "" + uri); if (DocumentsContract.isDocumentUri(this, uri)) { String docId = DocumentsContract.getDocumentId(uri); //数据表里指定的行 Log.d("getDocumentId(uri) :", "" + docId); Log.d("uri.getAuthority() :", "" + uri.getAuthority()); if ("com.android.providers.media.documents".equals(uri.getAuthority())) { String id = docId.split(":")[1]; String selection = MediaStore.Images.Media._ID + "=" + id; path = getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection); } else if ("com.android.providers.downloads.documents".equals(uri.getAuthority())) { Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(docId)); path = getImagePath(contentUri, null); } } else if ("content".equalsIgnoreCase(uri.getScheme())) { path = getImagePath(uri, null); } Log.v("path:", path); displayImage(path); } /** * 通过uri和selection来获取真实的图片路径,从相册获取图片时要用 */ private String getImagePath (Uri uri, String selection){ //String path = null; Cursor cursor = getContentResolver().query(uri, null, selection, null, null); if (cursor != null) { if (cursor.moveToFirst()) { path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)); } cursor.close(); } return path; } //显示图片到控件上面 private void displayImage (String imagePath){ if (!TextUtils.isEmpty(imagePath)) { orc_bitmap = BitmapFactory.decodeFile(imagePath);//获取图片 if (orc_bitmap != null) { ivphoto = (ImageView) findViewById(R.id.imageView); ivphoto.setImageBitmap(orc_bitmap); } } else { Toast.makeText(this, "图片获取失败", Toast.LENGTH_LONG).show(); } } protected void onActivityResult ( int requestCode, int resultCode, Intent data){ super.onActivityResult(requestCode, resultCode, data); switch (requestCode) { //打开相册后返回 case SELECT_PHOTO: if (resultCode == RESULT_OK) { //判断手机系统版本号 if (Build.VERSION.SDK_INT > 19) { //4.4及以上系统使用这个方法处理图片 handleImgeOnKitKat(data); } } break; } } }服务器获取图片的工具类UploadUtil
import android.util.Log;import com.alibaba.fastjson.JSONObject;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.UUID;public class UploadUtil { private static final String TAG = "uploadFile"; private static final int TIME_OUT = 10 * 1000;//超时时间 private static final String CHARSET = "utf-8";//设置编码 /** * android上传文件到服务器 * * @param file 需要上传的文件 * @param RequestURL 请求的url * @return 返回响应的内容 */ public static String uploadImage (File file, String RequestURL) { String result = "error"; String BOUNDARY = UUID.randomUUID().toString();//边界标识 随机生成 String PREFIX = "--", LINE_END = "\r\n"; String CONTENT_TYPE = "multipart/form-data";//内容类型 try { URL url = new URL(RequestURL); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setReadTimeout(TIME_OUT); conn.setConnectTimeout(TIME_OUT); conn.setDoInput(true);//允许输入流 conn.setDoOutput(true);//允许输出流 conn.setUseCaches(false);//不允许使用缓存 conn.setRequestMethod("POST");//请求方式 conn.setRequestProperty("Charset", CHARSET);//设置编码 conn.setRequestProperty("connection", "keep-alive"); conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY); conn.connect(); if (file != null) { //当文件不为空，把文件包装并且上传 DataOutputStream dos = new DataOutputStream(conn.getOutputStream()); /* * 获取响应码 200=成功 * 当响应成功，获取响应的流 */ dos.writeBytes(PREFIX + BOUNDARY + LINE_END); dos.writeBytes("Content-Disposition: form-data; " + "name=\"file\";filename=\"" + file.getName() + "\"" + LINE_END); dos.writeBytes(LINE_END); FileInputStream is = new FileInputStream(file); byte[] bytes = new byte[1024]; int len = -1; while ((len = is.read(bytes)) != -1) { dos.write(bytes, 0, len); } is.close(); dos.write(LINE_END.getBytes()); byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END).getBytes(); dos.write(end_data); dos.flush(); int res = conn.getResponseCode(); if (res == 200) { InputStream input = conn.getInputStream(); StringBuilder sbs = new StringBuilder(); int ss; while ((ss = input.read()) != -1) { sbs.append((char) ss); } result = sbs.toString(); Log.i(TAG, "result------------------>>" + result); } } } catch (IOException e) { e.printStackTrace(); } return result; } public static String upImage(ArrayList files, String RequestURL){ String result = "error"; String BOUNDARY = UUID.randomUUID().toString();//边界标识 随机生成 String PREFIX = "--", LINE_END = "\r\n"; String CONTENT_TYPE = "multipart/form-data"; try { URL url = new URL(RequestURL); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setReadTimeout(TIME_OUT); conn.setConnectTimeout(TIME_OUT); conn.setDoInput(true);//允许输入流 conn.setDoOutput(true);//允许输出流 conn.setUseCaches(false);//不允许使用缓存 conn.setRequestMethod("POST");//请求方式 conn.setRequestProperty("Charset", CHARSET);//设置编码 conn.setRequestProperty("connection", "keep-alive"); conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY); conn.connect(); if (files != null) { //当文件不为空，把文件包装并且上传 DataOutputStream dos = new DataOutputStream(conn.getOutputStream()); int res = conn.getResponseCode(); if (res == 200) { InputStream input = conn.getInputStream(); StringBuilder sbs = new StringBuilder(); int ss; while ((ss = input.read()) != -1) { sbs.append((char) ss); } result = sbs.toString(); Log.i(TAG, "result------------------>>" + result); } } } catch (IOException e) { e.printStackTrace(); } return result; } } 贴下界面
<?xml version="1.0" encoding="utf-8"?> 界面大概长这样
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