访问网络图片
2015-07-01 17:24
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开发步骤
1 建立UI界面
2 MainActivity.java代码
3 .AndroidManifest.xml
添加网络访问权限
android:name=”android.permission.INTERNET”/>
1 建立UI界面
<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" > <ImageView android:id="@+id/image1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="143dp" android:src="@drawable/ic_launcher" /> <EditText android:id="@+id/etLianJie" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/image1" android:layout_centerHorizontal="true" android:layout_marginTop="95dp" android:hint="@string/etLianJie" android:ems="10" > <requestFocus /> </EditText> <Button android:id="@+id/btnLiuLan" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/etLianJie" android:layout_centerHorizontal="true" android:layout_marginTop="23dp" android:onClick="showImage" android:text="@string/liulan" /> </RelativeLayout>
2 MainActivity.java代码
package cn.edu.bzu; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import android.os.Bundle; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.text.TextUtils; import android.view.Menu; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.Toast; public class MainActivity extends Activity { private Button btnLiuLan; private EditText etLianjie; private ImageView image1; public static final int CHANGE_UI = 1; public static final int ERROR = 2; // 在主线程中创建消息处理器 @SuppressLint("HandlerLeak") private Handler handler = new Handler() { // 接受处理消息 public void handleMessage(android.os.Message msg) { if(msg.what == CHANGE_UI) { Bitmap bitmap = (Bitmap) msg.obj; iv.setImageBitmap(bitmap); } else if(msg.what == ERROR) { Toast.makeText(MainActivity.this, "获取图片失败", Toast.LENGTH_SHORT).show(); } }; }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findId(); etLianjie.setText("http://img0.bdstatic.com/img/image/liuyifei_cover.png"); btnLiuLan.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { final String path = et_path.getText().toString().trim(); if(TextUtils.isEmpty(path)) { Toast.makeText(MainActivity.this, "图片的路径不能为空", Toast.LENGTH_SHORT).show(); } else { new Thread() { public void run() { //连接服务器,请求获取图片 try { URL url = new URL(path); //发送http的请求 HttpURLConnection httpURLConnection= (HttpURLConnection) url.openConnection(); httpURLConnection.setRequestMethod("GET"); //设置连接超时的时间 httpURLConnection.setConnectTimeout(5000); //得到服务器返回的响应码 int code = httpURLConnection.getResponseCode(); if(code == 200) { InputStream is = httpURLConnection.getInputStream(); Bitmap bitmap = BitmapFactory.decodeStream(is); // 告诉主线程帮忙修改线程 Message msg = new Message(); msg.what = CHANGE_UI; msg.obj = bitmap; handler.sendMessage(msg); } else { Toast.makeText(MainActivity.this, "获取图片失败", Toast.LENGTH_SHORT).show(); } } catch (Exception e) { e.printStackTrace(); Message msg = new Message(); msg.what = ERROR; handler.sendMessage(msg); 9fc3 Toast.makeText(MainActivity.this, "显示图片失败", Toast.LENGTH_SHORT).show(); } }; }.start(); } } }); } private void findId(){ btnLiuLan=(Button) findViewById(R.id.btnLiuLan); etLianjie=(EditText) findViewById(R.id.etLianJie); image1=(ImageView) findViewById(R.id.image1); } }
3 .AndroidManifest.xml
添加网络访问权限
android:name=”android.permission.INTERNET”/>
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="cn.edu.bzu" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="15" android:targetSdkVersion="17" /> <uses-permission **android:name="android.permission.INTERNET"/>** <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="cn.edu.bzu.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>
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