首页 / 移动开发 / Android / Android使用线程获取网络图片的方法

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.zdcrobot.handlermessage"><uses-permission android:name="android.permission.INTERNET"></uses-permission><applicationandroid:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:supportsRtl="true"android:theme="@style/AppTheme"><activityandroid:name=".MainActivity"android:label="@string/app_name"android:theme="@style/AppTheme.NoActionBar"><intent-filter><action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application> </manifest>

<?xml version="1.0" encoding="utf-8"?><android.support.design.widget.CoordinatorLayout 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"android:fitsSystemWindows="true"tools:context="com.zdcrobot.handlermessage.MainActivity"> <LinearLayoutandroid:orientation="vertical"android:layout_width="match_parent"android:layout_height="match_parent"><Buttonandroid:id="@+id/button1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="加载图片"/><ImageViewandroid:id="@+id/image1"android:layout_width="match_parent"android:layout_height="500dp" /></LinearLayout> </android.support.design.widget.CoordinatorLayout>

package com.zdcrobot.handlermessage; import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.ImageView; import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL; public class MainActivity extends AppCompatActivity {private Button button;private ImageView imageView;private String imagPath = "http://pica.nipic.com/2007-11-09/200711912453162_2.jpg";private final int IS_FINISH = 1;private Handler handler = new Handler（）{@Overridepublic void handleMessage（Message msg） {Bitmap bitmap = （Bitmap）msg.obj;imageView.setImageBitmap（bitmap）;}};@Overrideprotected void onCreate（Bundle savedInstanceState） {super.onCreate（savedInstanceState）;setContentView（R.layout.activity_main）;button = （Button）findViewById（R.id.button1）;imageView = （ImageView）findViewById（R.id.image1）;button.setOnClickListener（new View.OnClickListener（） {@Overridepublic void onClick（View v） {new Thread（new MyClass（））.start（）;}}）;} public class MyClass implements Runnable{ @Overridepublic void run（） {Bitmap bitmap = null;try {URL url = new URL（imagPath）;HttpURLConnection httpURLConnection = （HttpURLConnection）url.openConnection（）;httpURLConnection.setDoInput（true）;httpURLConnection.connect（）;InputStream inputStream = httpURLConnection.getInputStream（）;bitmap = BitmapFactory.decodeStream（inputStream）;} catch （MalformedURLException e） {e.printStackTrace（）;} catch （IOException e） {e.printStackTrace（）;}Message message = Message.obtain（）;message.obj = bitmap;message.what = IS_FINISH;handler.sendMessage（message）;}}}