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前段时间学习线程，想通过子线程获取网络图片，进而更新主UI界面的学习。发现大部分的Demo都是基于HttpClient的使用，但google似乎削弱了HttpClient，我甚至只能找到HttpURLConnection的相关类。没办法，只能寻找新的途径，这就是这篇译文的由来。
1.下载最新版本的OKHttp的Jar包，和Okio的Jar包。
2.在Android studio 中，导入Jar包。
最快捷的方式是：（但是我有时候我这样操作没用，不知道问什么，之后乖乖下载再导入Jar包）
compile ‘com.squareup.okhttp:okhttp:2.5.0‘
compile ‘com.squareup.okio:okio:1.6.0‘
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity"> <LinearLayout android:id="@+id/linearLayout1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:weightSum="1"> <EditText android:id="@+id/editText1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight=".2" /> <Button android:id="@+id/button1" style="?android:attr/buttonStyleSmall" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight=".8" android:onClick="downloadUrl" android:text="Go" /> </LinearLayout> <TextView android:id="@+id/textView1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/linearLayout1" android:layout_centerHorizontal="true" android:layout_marginTop="35dp" android:text="" android:textAppearance="?android:attr/textAppearanceSmall" /> </RelativeLayout>
package com.ryan.handler_messagedemo; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.EditText; import android.widget.TextView; import com.squareup.okhttp.OkHttpClient; import java.util.concurrent.ExecutionException; public class MainActivity extends AppCompatActivity { private EditText edtText; private TextView outputText; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); edtText = (EditText) findViewById(R.id.editText1); outputText = (TextView) findViewById(R.id.textView1); } public void downloadUrl(View view) { String url = "http://" + edtText.getText().toString(); OkHttpHandler handler = new OkHttpHandler(); String result = null; try { result = (String) handler.execute(url).get(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ExecutionException e) { // TODO Auto-generated catch block e.printStackTrace(); } outputText.append(result + "\n"); } }
package com.ryan.handler_messagedemo; import android.os.AsyncTask; import com.squareup.okhttp.OkHttpClient; import com.squareup.okhttp.Request; import com.squareup.okhttp.Response; /** * Created by air on 15-9-1. */ public class OkHttpHandler extends AsyncTask { OkHttpClient client = new OkHttpClient(); @Override protected Object doInBackground(Object[] params) { Request.Builder builder = new Request.Builder(); builder.url((String) params[0]); Request request = builder.build(); try { Response response = client.newCall(request).execute(); return response.body().string(); } catch (Exception e) { } return null; } }
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.ryan.handler_messagedemo" > <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.skholingua.android.okhttp_getanimage.MainActivity" > <ImageView android:id="@+id/imageView1" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:visibility="invisible" android:src="@drawable/ic_launcher" /> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:text="Download Image" /> </RelativeLayout>
package com.ryan.okhttp_getimagedemo01; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.ImageView; public class MainActivity extends AppCompatActivity { Button downloadBtn; ImageView mImage; private final String URL = "http://pic.cnblogs.com/avatar/790633/20150727124352.png"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); downloadBtn = (Button) findViewById(R.id.button1); mImage = (ImageView) findViewById(R.id.imageView1); downloadBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { downloadBtn.setVisibility(View.INVISIBLE); OkHttpHandler handler = new OkHttpHandler(); byte[] image = new byte[0]; try { image = (byte[]) handler.execute(URL).get(); if (image != null && image.length > 0) { Bitmap bitmap = BitmapFactory.decodeByteArray(image, 0, image.length); mImage.setImageBitmap(bitmap); mImage.setVisibility(View.VISIBLE); } } catch (Exception e) { } } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } }
package com.ryan.okhttp_getimagedemo01; import android.os.AsyncTask; import com.squareup.okhttp.OkHttpClient; import com.squareup.okhttp.Request; import com.squareup.okhttp.Response; /** * Created by air on 15-9-1. */ public class OkHttpHandler extends AsyncTask { OkHttpClient client = new OkHttpClient(); @Override protected Object doInBackground(Object[] params) { Request.Builder builder = new Request.Builder(); builder.url((String) params[0]); Request request = builder.build(); try { Response response = client.newCall(request).execute(); return response.body().bytes(); } catch (Exception e) { } return null; } }
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.ryan.okhttp_getimagedemo01" > <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
至此，简单的使用已经完成，后续将具体的学习有关 OkHttp的内容和 线程的学习。
关于3. Post To Server 4. Authentication 现在还没有学习到，
更多内容可以查看我的译文来源：http://www.skholingua.com/android-basic/other-sdk-n-libs/okhttp#
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原文地址：http://www.cnblogs.com/ryan-ys/p/4776265.html
