android查看网络图片的实现方法_Android

本文实例为大家分享了android查看网络图片的具体代码，供大家参考，具体内容如下

需求描述：输入一个图片地址，下载到本地展示。

效果展示

android查看网络图片的实现方法

代码清单

MainActivity.java

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									package com.example.www.checkimage;

									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.EditText;

									import android.widget.ImageView;

									import android.widget.Toast;

									import java.io.InputStream;

									import java.net.HttpURLConnection;

									import java.net.URL;

									public class MainActivity extends AppCompatActivity {

									 private EditText mPt_url;

									 private ImageView mIv_show;

									 private Handler mHandler = new Handler(){

									 @Override

									 public void handleMessage(Message msg) {

									 if(msg.what == 1){

									 Bitmap bitmap = (Bitmap) msg.obj;

									 mIv_show.setImageBitmap(bitmap);

									 Toast.makeText(getApplicationContext(), "图片展示成功", Toast.LENGTH_LONG).show();

									 }

									 }

									 };

									 @Override

									 protected void onCreate(Bundle savedInstanceState) {

									 super.onCreate(savedInstanceState);

									 setContentView(R.layout.activity_main);

									 mPt_url = (EditText) findViewById(R.id.pt_url);

									 mIv_show = (ImageView) findViewById(R.id.imageCon);

									 }

									 public void checkImage(View v) {

									 new Thread(){

									 @Override

									 public void run() {

									 try {

									  String path = mPt_url.getText().toString().trim();

									  URL url = new URL(path);

									  HttpURLConnection conn = (HttpURLConnection) url.openConnection();

									  conn.setRequestMethod("GET");

									  conn.setConnectTimeout(5000);

									  int responseCode = conn.getResponseCode();

									  if(responseCode == 200) {

									  InputStream is = conn.getInputStream();

									  Bitmap bitmap = BitmapFactory.decodeStream(is);

									  Message msg = Message.obtain(); // 创建 消息

									  msg.obj = bitmap;

									  msg.what = 1;

									  mHandler.sendMessage(msg);

									  }

									 } catch (Exception e) {

									  e.printStackTrace();

									 }

									 }

									 }.start();

									 }

									}

activiity_main.xml

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									<?xml version="1.0" encoding="utf-8"?>

									<android.support.constraint.ConstraintLayout 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">

									 <EditText

									 android:id="@+id/pt_url"

									 android:layout_width="368dp"

									 android:layout_height="wrap_content"

									 android:layout_marginStart="8dp"

									 android:layout_marginTop="8dp"

									 android:layout_marginEnd="8dp"

									 android:ems="10"

									 android:hint="请输入与图片地址"

									 android:inputType="textPersonName"

									 app:layout_constraintEnd_toEndOf="parent"

									 app:layout_constraintStart_toStartOf="parent"

									 app:layout_constraintTop_toTopOf="parent" />

									 <Button

									 android:id="@+id/button"

									 android:layout_width="wrap_content"

									 android:layout_height="wrap_content"

									 android:layout_marginStart="8dp"

									 android:layout_marginTop="8dp"

									 android:layout_marginEnd="8dp"

									 android:text="Button"

									 app:layout_constraintEnd_toEndOf="parent"

									 app:layout_constraintHorizontal_bias="0.0"

									 app:layout_constraintStart_toStartOf="parent"

									 android:onClick="checkImage"

									 app:layout_constraintTop_toBottomOf="@+id/pt_url" />

									 <ImageView

									 android:id="@+id/imageCon"

									 android:layout_width="0dp"

									 android:layout_height="0dp"

									 android:layout_marginStart="8dp"

									 android:layout_marginTop="8dp"

									 android:layout_marginEnd="8dp"

									 android:layout_marginBottom="8dp"

									 app:layout_constraintBottom_toBottomOf="parent"

									 app:layout_constraintEnd_toEndOf="parent"

									 app:layout_constraintStart_toStartOf="parent"

									 app:layout_constraintTop_toBottomOf="@+id/button"

									 app:srcCompat="@mipmap/ic_launcher" />

									</android.support.constraint.ConstraintLayout>

AndroidManifest.xml

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									<?xml version="1.0" encoding="utf-8"?>

									<manifest xmlns:android="http://schemas.android.com/apk/res/android"

									 package="com.example.www.checkimage">

									 <uses-permission android:name="android.permission.INTERNET"/>

									 <application

									 android:allowBackup="true"

									 android:icon="@mipmap/ic_launcher"

									 android:label="@string/app_name"

									 android:roundIcon="@mipmap/ic_launcher_round"

									 android:supportsRtl="true"

									 android:theme="@style/AppTheme">

									 <activity android:name=".MainActivity">

									 <intent-filter>

									 <action android:name="android.intent.action.MAIN" />

									 <category android:name="android.intent.category.LAUNCHER" />

									 </intent-filter>

									 </activity>

									 </application>

									</manifest>