okHttp上傳圖片\下載圖片
阿新 • • 發佈:2018-11-19
首先我們需要先匯入依賴,或者去看GitHub的官方文件找最新版:
implementation 'com.squareup.okhttp3:okhttp:3.11.0'
其次我們就需要加入許可權
<uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
一、佈局很簡單,就2個按鈕加一個圖片
<LinearLayout 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=".MainActivity" android:orientation="vertical"> <Button android:id="@+id/downLoad" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="下載圖片"/> <Button android:id="@+id/upLoad" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="上傳圖片"/> <ImageView android:id="@+id/imageView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_marginTop="55dp"/> </LinearLayout>
二、MainActivity程式碼
public class MainActivity extends AppCompatActivity implements View.OnClickListener { private ImageView mImageView; private String downLoadUrl = "https://10.url.cn/eth/ajNVdqHZLLAxibwnrOxXSzIxA76ichutwMCcOpA45xjiapneMZsib7eY4wUxF6XDmL2FmZEVYsf86iaw/"; private String upLoadUrl = "https://www.718shop.com/sell/sell.m.picture.upload.do"; //handler成功和失敗的標識 private static final int SUCCESS = 0; private static final int FAILURE = 1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //初始化控制元件 initView(); } @SuppressLint("HandlerLeak") private Handler mHandler = new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); switch (msg.what){ case SUCCESS: //拿到obj中的資料 byte[] bytes = (byte[]) msg.obj; //使用BitmapFactory將位元組轉換成bitmap型別 Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length); //設定圖片 mImageView.setImageBitmap(bitmap); break; case FAILURE: Toast.makeText(MainActivity.this, "請求資料失敗", Toast.LENGTH_SHORT).show(); break; } } }; private void initView() { Button downLoad = findViewById(R.id.downLoad); Button upLoad = findViewById(R.id.upLoad); mImageView = findViewById(R.id.imageView); downLoad.setOnClickListener(this); upLoad.setOnClickListener(this); } //點選 @Override public void onClick(View v) { switch (v.getId()){ //下載 case R.id.downLoad: downLoad(); break; //上傳 case R.id.upLoad: upLoad(); break; } } //下載 private void downLoad() { //建立okHttp OkHttpClient client = new OkHttpClient.Builder() .connectTimeout(8, TimeUnit.SECONDS) .readTimeout(8, TimeUnit.SECONDS) .build(); //建立request Request request = new Request.Builder() .url(downLoadUrl).build(); //建立call Call call = client.newCall(request); call.enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { mHandler.sendEmptyMessage(FAILURE); } @Override public void onResponse(Call call, Response response) throws IOException { //將流轉換成位元組 byte[] bytes = response.body().bytes(); //獲取message物件 Message message = mHandler.obtainMessage(); //將位元組存入obj message.obj = bytes ; //設定一個標識 message.what = SUCCESS; //傳送 mHandler.sendMessage(message); } }); } //這裡需要注意下我們圖片的路徑: /* 檔案儲存:應用程式可以把資料儲存在外儲存卡(sd卡),存放的路徑:/mnt/sdcard/檔名,可以放較的大資料 注意:Android系統版本4.3之前路徑是/mnt/sdcard ,Android系統版本4.3之後storage/sdcard*/ //上傳 private void upLoad() { //建立檔案物件 File file = new File(Environment.getExternalStorageDirectory() + "/Download" , "timg.jpg"); //建立RequestBody封裝引數 RequestBody fileBody = RequestBody.create(MediaType.parse("application/octet-stream"), file); //建立MultiparBody,給RequestBody進行設定 MultipartBody multipartBody = new MultipartBody.Builder() .setType(MultipartBody.FORM) .addFormDataPart("image", "timg.jpg", fileBody) .build(); //建立Request Request request = new Request.Builder() .url(upLoadUrl) .post(multipartBody) .build(); //建立okHttpClient OkHttpClient client = new OkHttpClient.Builder() .readTimeout(8, TimeUnit.SECONDS) .connectTimeout(8, TimeUnit.SECONDS) .writeTimeout(8,TimeUnit.SECONDS) .build(); //建立call物件 Call call = client.newCall(request); call.enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { Log.e("wjh","upLoad 、 e=" + e); } @Override public void onResponse(Call call, Response response) throws IOException { Log.e("wjh","upLoad 、 response = "+response.body().string()); } }); } }