Main.java
package src.com;
import java.io.File;
import java.io.FileOutputStream;import java.io.InputStream;import java.net.URL;import java.net.URLConnection;import android.app.Activity;
import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.util.Log;import android.view.View;import android.webkit.URLUtil;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class Main extends Activity {
private TextView mTextView01; private EditText mEditText01; private Button mButton01; private static final String TAG = "DOWNLOADAPK"; private String currentFilePath = ""; private String currentTempFilePath = ""; private String strURL = ""; private String fileEx = ""; private String fileNa = ""; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mTextView01 = (TextView) findViewById(R.id.myTextView1); mButton01 = (Button) findViewById(R.id.myButton1); mEditText01 = (EditText) findViewById(R.id.myEditText1); mButton01.setOnClickListener(new Button.OnClickListener(){@Override
public void onClick(View v) { /* 文件会下载至local端 */ mTextView01.setText("下载中..."); strURL = mEditText01.getText().toString(); /*取得欲安装程序的文件名称*/ fileEx = strURL.substring(strURL.lastIndexOf(".") + 1, strURL.length()).toLowerCase(); fileNa = strURL.substring(strURL.lastIndexOf("/") + 1, strURL.lastIndexOf(".")); getFile(strURL); } }); mEditText01.setOnClickListener(new EditText.OnClickListener(){@Override
public void onClick(View v) { mEditText01.setText(""); mEditText01.setText("远程安装程序(请输入URL)"); } }); } /* 处理下载URL文件自定义函数 */ private void getFile(final String strPath){ try{ if( strPath.equals(currentFilePath) ){ getDataSource(strPath); } currentFilePath = strPath; Runnable r = new Runnable(){@Override
public void run() { try{ getDataSource(strPath); }catch(Exception e){ Log.e(TAG, e.getMessage(), e); } } }; }catch(Exception e){ e.printStackTrace(); } } /* 取得远程文件 */ private void getDataSource(String strPath) throws Exception{ if( !URLUtil.isNetworkUrl(strPath) ){ mTextView01.setText("错误的URL"); }else{ /* 取得URL */ URL myURL = new URL(strPath); /* 创建连接 */ URLConnection conn = myURL.openConnection(); conn.connect(); /* InputStream 下载文件 */ InputStream is = conn.getInputStream(); if( is == null ){ throw new RuntimeException("stream is null"); } /* 创建临时文件 */ File myTempFile = File.createTempFile(fileNa, "."+fileEx); /* 取得暂存盘案路径 */ currentTempFilePath = myTempFile.getAbsolutePath(); /* 将文件写入暂存盘 */ FileOutputStream fos = new FileOutputStream(myTempFile); byte buf[] = new byte[128]; do{ int numread = is.read(buf); if( numread <= 0 ){ break; } fos.write(buf, 0, numread); }while(true); /* 打开文件进行安装 */ openFile(myTempFile); try{ is.close(); }catch(Exception ex){ Log.e(TAG, "error: " + ex.getMessage(), ex); } } }private void openFile(File f) {
Intent intent = new Intent(); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); /* 调用getMIMEType()来取得MimeType */ String type = getMimeType(f); /* 设置intent的file与MimeType */ intent.setDataAndType(Uri.fromFile(f), type); startActivity(intent); }private String getMimeType(File f) {
String type = ""; String fName = f.getName(); /* 取得扩展名 */ String end = fName.substring(fName.lastIndexOf(".")+1,fName.length()).toLowerCase(); /* 依扩展名的类型决定MimeType */ if( end.equals("m4a") || end.equals("mp3") || end.equals("mid") || end.equals("xmf") || end.equals("ogg") || end.equals("wav") ){ type = "audio"; }else if( end.equals("3gp") || end.equals("mp4") ){ type = "video"; }else if( end.equals("jpg") || end.equals("gif") || end.equals("png") || end.equals("jpeg") || end.equals("bmp") ){ type = "image"; }else if( end.equals("apk") ){ type = "application/vnd.android.package-archive"; }else{ type = ""; } /* 如果无法直接打开，就跳出软件列表给用户选择 */ if( end.equals("apk") ){ }else{ type += "/*"; } return type; } /* 自定义删除文件方法 */ private void delFile(String strFileName){ File myFile = new File(strFileName); if( myFile.exists() ){ myFile.delete(); } } /* 当Activity处于onPause状态时，更改TextView文字状态 */ protected void onPause(){ mTextView01 = (TextView) findViewById(R.id.myTextView1); mTextView01.setText("下载成功"); super.onPause(); } /* 当Activity处于onResume状态时，删除临时文件 */ protected void onResume(){ /*删除临时文件*/ delFile(currentTempFilePath); super.onResume(); }}
download Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="src.com" android:versionCode="1" android:versionName="1.0" ><uses-sdk android:minSdkVersion="7" />
<application
android:icon="@drawable/icon" android:label="@string/app_name" > <activity android:name=".Main" 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> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.INSTALL_PACKAGES" /> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission>"</manifest>
layout目录下的main.xml
<?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:orientation="vertical" android:id="@+id/widget27" ><TextView
android:id="@+id/myTextView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/str_text" /> <EditText android:id="@+id/myEditText1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/str_url" android:textSize="18sp" /> <Button android:id="@+id/myButton1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/str_button" /></LinearLayout>
values目录下的xml
strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources><string name="str_button">开始安装</string>
<string name="str_text">远程安装程序(请输入URL)</string> <string name="str_url">http://127.0.0.1:8080/android/hello.apk</string> <string name="app_name">远程下载安装程序</string></resources>
color.xml
<?xml version="1.0" encoding="utf-8"?>
<resources> <drawable name="darkgray">#808080</drawable> <drawable name="white">#FFFFFF</drawable> <drawable name="blue">#0000FF</drawable> </resources>