从指定网址下载文件 并读出其内容 && 从网上下载文件放在本地&&从网上获取图片设在imageView里

第一部分 从指定网址下载文件 并读出其内容

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需要在AndroidManifest.xml里加入如下句

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

/*检测是否需要网络升级*/        try{    CheckForSystemNetUpdate();        }catch(IOException e){                }

private void CheckForSystemNetUpdate() throws IOException {Log.d(TAG, "CheckForSystemNetUpdate...");if(isNetworkAvailable()){Log.d(TAG, "NetworkAvailable..."); URL url = null;try {url = new URL("http://update.egreatworld.com:8080/software/update/M6/update_signed.ini");} catch (MalformedURLException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}        InputStream inputStream = null;        BufferedReader bufferedReader = null;        StringBuffer buffer = new StringBuffer();        HttpURLConnection httpUrlConnection = (HttpURLConnection) url.openConnection();        try{            httpUrlConnection.connect();        } catch(IOException e){            Log.e(TAG, "httpUrlConnection connect error!!!!!");            e.printStackTrace();        }        Log.d(TAG, "response code = " + httpUrlConnection.getResponseCode());        inputStream = httpUrlConnection.getInputStream();        bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "utf-8"));        String line = "";        while ((line = bufferedReader.readLine()) != null) {            buffer.append(line);            buffer.append("\r\n");        }        httpUrlConnection.disconnect();                Log.d(TAG, "---------ini = "+buffer);                parseIni(buffer.toString());}}

/** * 解析ini文件里的字符串 * @param string 要解析的字符串 */private void parseIni(String str) { String parts[] = str.split("\r\n"); boolean isEnforcement = false;  String version = ""; String updateinfo = ""; int i=0;for(;i<parts.length;i++){Log.d(TAG, "==============test = "+parts[i]);if("updatemode=0".equals(parts[i].trim())){isEnforcement = false;}else if("updatemode=1".equals(parts[i].trim())){isEnforcement = true;}else if("[version]".equals(parts[i].trim())){version = parts[i+1].trim();}else if("[updateinfo]".equals(parts[i].trim())){i++;break;}}String temp[] = version.split("=");version = temp[1].trim();/*读取当前版本号*/String tempString = (Build.VERSION.INCREMENTAL.substring(1)).trim();Log.d(TAG, "-------------system version="+tempString);if(tempString.equals(version)){}else{/*得到升级信息*/for(;i<parts.length;i++){updateinfo +=parts[i]+"\r\n";Log.d(TAG, "==============test = "+parts[i]);}showNetUpdateDialog(isEnforcement,version,updateinfo);}}

private void showNetUpdateDialog(boolean isEnforcement,String version,String updateinfo){Log.d(TAG, "isEnforcement="+isEnforcement+"\n"+"updateinfo="+updateinfo);/*添加蒙层*/    mHomeActivity.findViewById(R.id.gray_background).setVisibility(View.VISIBLE);    final DialogNetUpdate mDialogNetUpdate= new DialogNetUpdate(mContext, isEnforcement, version, updateinfo);mDialogNetUpdate.setOnclickCancel().setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {mDialogNetUpdate.dismiss();/*去除蒙层*/    mHomeActivity.findViewById(R.id.gray_background).setVisibility(View.GONE);}});mDialogNetUpdate.setOnclickConfirm().setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent();ComponentName name = null;name = new ComponentName("com.android.settings", "com.android.settings.update.SystemNetUpdateActivity");intent.setComponent(name);mContext.startActivity(intent);//加入转场动画((Activity) mContext).overridePendingTransition(R.anim.zoom_enter,R.anim.zoom_exit);}});mDialogNetUpdate.show();}

Dialog代码如下

package com.egreat.commonComponent;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.Context;import android.content.DialogInterface;import android.content.DialogInterface.OnKeyListener;import android.view.KeyEvent;import android.view.LayoutInflater;import android.view.View;import android.widget.Button;import android.widget.TextView;import com.egreat.elauncher.HomeActivity;import com.egreat.elauncher.R;import com.egreat.elauncher.R.id;import com.egreat.elauncher.R.layout;/** * @author peter.wen * */public class DialogNetUpdate {Dialog mDialog;TextView mTextViewLeftTitle,mTextViewRightTitle,mTextViewContent;Context mContext;//要现实的文字String mVersionString,mInfoString;//取消按钮Button mDialog_cancal,mDialog_confirm;LayoutInflater inflater;//自定义的dialog布局View linearlayout;public DialogNetUpdate(Context mContext,boolean isEnforcement,String version,String updateinfo) {// TODO Auto-generated constructor stubthis.mContext = mContext;inflater = LayoutInflater.from(mContext);linearlayout = inflater.inflate(R.layout.dialog_net_update, null);//取消按钮mDialog_cancal = (Button) linearlayout.findViewById(R.id.dl_cancal);//确认按钮mDialog_confirm = (Button) linearlayout.findViewById(R.id.dl_confirm);mTextViewLeftTitle = (TextView) linearlayout.findViewById(R.id.dl_text_left_title);mTextViewRightTitle = (TextView) linearlayout.findViewById(R.id.dl_text_right_title);mTextViewContent = (TextView) linearlayout.findViewById(R.id.dl_text_content);if(isEnforcement){mDialog_cancal.setVisibility(View.GONE);}mTextViewRightTitle.setText(version);mTextViewContent.setText(updateinfo);//用Dialog 用R.style.dialog 可以去除白边 不能用 new AlertDialog.Builder(mContext).setView(linearlayout).show();去做mDialog = new Dialog(mContext,R.style.dialog);mDialog.setContentView(linearlayout);mDialog.setCanceledOnTouchOutside(false);// 设置点击屏幕Dialog不消失 /*屏蔽按键*/mDialog.setOnKeyListener(new OnKeyListener() {@Overridepublic boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {switch (keyCode) {case KeyEvent.KEYCODE_DPAD_CENTER:case KeyEvent.KEYCODE_DPAD_UP:case KeyEvent.KEYCODE_DPAD_DOWN:case KeyEvent.KEYCODE_DPAD_LEFT:case KeyEvent.KEYCODE_DPAD_RIGHT:case KeyEvent.KEYCODE_ENTER:return false;default:break;}return true;}});mDialog_confirm.requestFocus();}public void show(){mDialog.show();}//关闭对话框public void dismiss(){mDialog.dismiss();}public Button setOnclickCancel(){return mDialog_cancal;}public Button setOnclickConfirm(){return mDialog_confirm;}public void setCancelName(String cancel) {mDialog_cancal.setText(cancel);}public void setConfirmName(String confirm) {mDialog_confirm.setText(confirm);}}

dialog对应的xml文件如下

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:gravity="center" ><FrameLayout    android:id="@+id/dialog"    android:layout_width="454dp"    android:layout_height="500dp"    android:background="@drawable/common_dialog_net_update"    android:orientation="vertical" >    <LinearLayout        android:layout_width="match_parent"        android:layout_height="50dp"        android:orientation="horizontal"        android:layout_marginTop="10dp"        android:layout_marginLeft="20dp"        android:layout_marginRight="20dp"        android:layout_gravity="top">        <TextView            android:id="@+id/dl_text_left_title"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_gravity="left"            android:text="@string/new_software"            android:textSize="25sp" />                <TextView            android:id="@+id/dl_text_right_title"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:gravity="right"            android:text="@string/software_version"            android:textSize="25sp" />    </LinearLayout>        <ScrollView         android:id="@+id/ScrollView"        android:layout_width="match_parent"        android:layout_height="wrap_content"android:layout_marginTop="55dp"        android:layout_gravity="center_horizontal"        android:scrollbarThumbVertical="@drawable/indicate"        android:scrollbarTrackVertical="@drawable/indicatebg"        android:nextFocusDown="@+id/dl_confirm"        >          <TextView            android:id="@+id/dl_text_content"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginLeft="20dp"            android:layout_marginRight="20dp"            android:lineSpacingExtra="8dp"            android:text="@string/test"            android:textSize="25sp" />    </ScrollView>    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_gravity="bottom"        android:layout_marginBottom="0dp"        android:orientation="horizontal" >        <Button            android:id="@+id/dl_cancal"            android:layout_width="wrap_content"            android:layout_height="50dp"            android:textColor="#FFFFFFFF"            android:background="@drawable/dialog_button_selector"            android:textSize="25dp"            android:layout_gravity="bottom"            android:layout_marginBottom="0dp"            android:nextFocusUp="@+id/ScrollView"            android:text="@string/cancal" />        <Button            android:id="@+id/dl_confirm"            android:layout_width="match_parent"            android:layout_height="50dp"            android:textColor="#FFFFFFFF"            android:background="@drawable/dialog_button_selector"            android:textSize="25dp"            android:layout_gravity="bottom"            android:layout_marginBottom="0dp"            android:nextFocusUp="@+id/ScrollView"            android:text="@string/update_now" />            </LinearLayout></FrameLayout></LinearLayout>

第二部分 从网上下载文件放在本地

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package com.example.hello;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import android.app.Activity;import android.os.Bundle;import android.util.Log;public class MainActivity extends Activity {String TAG = "MainActivity";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);new Thread(new Runnable() {@Overridepublic void run() {downloadXml();}}).start();}protected boolean downloadXml() {Log.d(TAG, "---------downloadXml");HttpURLConnection httpConnection = null;InputStream is = null;FileOutputStream fos = null;URL url = null;String localPath = getCacheDir() + "/wen.txt";try {url = new URL("http://192.168.4.4/111111.txt");httpConnection = (HttpURLConnection) url.openConnection();httpConnection.connect();is = httpConnection.getInputStream();fos = new FileOutputStream(new File(localPath));byte[] buffer = new byte[1024];int len = 0;while ((len = is.read(buffer)) > -1) {fos.write(buffer, 0, len);fos.flush();}return true;} catch (Exception e) {e.printStackTrace();return false;} finally {try {if (httpConnection != null) {httpConnection.disconnect();}if (is != null) {is.close();}if (fos != null) {fos.close();}} catch (Exception e) {e.printStackTrace();}Log.d(TAG, "---------downloadXml finally");}}}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.hello"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        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="com.example.hello.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>

第三部分 从网上获取图片设在imageView里

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对第二部分代码稍加改造即可

protected Bitmap downloadXml() {Log.d(TAG, "---------downloadXml");Bitmap mBitmap;HttpURLConnection httpConnection = null;InputStream is = null;FileOutputStream fos = null;URL url = null;String localPath = getCacheDir() + "/22.jpg";try {url = new URL("http://192.168.4.4/11.jpg");httpConnection = (HttpURLConnection) url.openConnection();httpConnection.connect();is = httpConnection.getInputStream();fos = new FileOutputStream(new File(localPath));byte[] buffer = new byte[1024];int len = 0;while ((len = is.read(buffer)) > -1) {fos.write(buffer, 0, len);fos.flush();}return BitmapFactory.decodeFile(localPath);} catch (Exception e) {e.printStackTrace();return null;} finally {try {if (httpConnection != null) {httpConnection.disconnect();}if (is != null) {is.close();}if (fos != null) {fos.close();}} catch (Exception e) {e.printStackTrace();}Log.d(TAG, "---------downloadXml finally");}}

@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ImageView iamge;iamge = (ImageView) findViewById(R.id.iamge);new Thread(new Runnable() {@Overridepublic void run() {b = downloadXml();}}).start();try {Thread.sleep(1000);} catch (Exception e) {// TODO: handle exception}iamge.setImageBitmap(b);}