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  • Android开发打开文件的Intent及使用

    在写文件管理系统时会用到各种打开不同格式的文件的需求,由于Android系统默认内置了一些可以打开的系统应用,但还是不能满足需求,比如打开视频文件、word等,需要安装相应的播放软件才可以使用,这时程序会通过Intent查找可以使用的软件实现通过代码打开一个文件需要2部分,一部分是要获取到不同文件的后缀,以便根据需求匹配相应的Intent,另一个就是不同格式的文件打开的Intent不同1、在values目录下定义后缀数组文件fileendings

        <?xml version="1.0" encoding="utf-8"?>
        <resources>
        <array name="fileEndingImage">
        <item>.png</item>
        <item>.gif</item>
        <item>.jpg</item>
        <item>.jpeg</item>
        <item>.bmp</item>
        </array>
        <array name="fileEndingAudio">
        <item>.mp3</item>
        <item>.wav</item>
        <item>.ogg</item>
        <item>.midi</item>
        </array>
        <array name="fileEndingVideo">
        <item>.mp4</item>
        <item>.rmvb</item>
        <item>.avi</item>
        <item>.flv</item>
        </array>
        <array name="fileEndingPackage">
        <item>.jar</item>
        <item>.zip</item>
        <item>.rar</item>
        <item>.gz</item>
        <item>.apk</item>
        <item>.img</item>
        </array>
        <array name="fileEndingWebText">
        <item>.htm</item>
        <item>.html</item>
        <item>.php</item>
        <item>.jsp</item>
        </array>
        <array name="fileEndingText">
        <item>.txt</item>
        <item>.java</item>
        <item>.c</item>
        <item>.cpp</item>
        <item>.py</item>
        <item>.xml</item>
        <item>.json</item>
        <item>.log</item>
        </array>
        <array name="fileEndingWord">
        <item>.doc</item>
        <item>.docx</item>
        </array>
        <array name="fileEndingExcel">
        <item>.xls</item>
        <item>.xlsx</item>
        </array>
        <array name="fileEndingPPT">
        <item>.ppt</item>
        <item>.pptx</item>
        </array>
         
        <array name="fileEndingPdf">
        <item>.p<?xml version="1.0" encoding="utf-8"?>
        <resources>
        <array name="fileEndingImage">
        <item>.png</item>
        <item>.gif</item>
        <item>.jpg</item>
        <item>.jpeg</item>
        <item>.bmp</item>
        </array>
        <array name="fileEndingAudio">
        <item>.mp3</item>
        <item>.wav</item>
        <item>.ogg</item>
        <item>.midi</item>
        </array>
        <array name="fileEndingVideo">
        <item>.mp4</item>
        <item>.rmvb</item>
        <item>.avi</item>
        <item>.flv</item>
        </array>
        <array name="fileEndingPackage">
        <item>.jar</item>
        <item>.zip</item>
        <item>.rar</item>
        <item>.gz</item>
        <item>.apk</item>
        <item>.img</item>
        </array>
        <array name="fileEndingWebText">
        <item>.htm</item>
        <item>.html</item>
        <item>.php</item>
        <item>.jsp</item>
        </array>
        <array name="fileEndingText">
        <item>.txt</item>
        <item>.java</item>
        <item>.c</item>
        <item>.cpp</item>
        <item>.py</item>
        <item>.xml</item>
        <item>.json</item>
        <item>.log</item>
        </array>
        <array name="fileEndingWord">
        <item>.doc</item>
        <item>.docx</item>
        </array>
        <array name="fileEndingExcel">
        <item>.xls</item>
        <item>.xlsx</item>
        </array>
        <array name="fileEndingPPT">
        <item>.ppt</item>
        <item>.pptx</item>
        </array>
         
        <array name="fileEndingPdf">
        <item>.pdf</item>
        </array>
        </resources>df</item>
        </array>
        </resources>
    
    

    2、定义OpenFiles工具类,只需传输File参数即可,然后通过返回的Intent打开文件

        public class OpenFiles {
        //android获取一个用于打开HTML文件的intent
        public static Intent getHtmlFileIntent(File file)
        {
        Uri uri = Uri.parse(file.toString()).buildUpon().encodedAuthority("com.android.htmlfileprovider").scheme("content").encodedPath(file.toString()).build();
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.setDataAndType(uri, "text/html");
        return intent;
        }
        //android获取一个用于打开图片文件的intent
        public static Intent getImageFileIntent(File file)
        {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addCategory("android.intent.category.DEFAULT");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        Uri uri = Uri.fromFile(file);
        intent.setDataAndType(uri, "image/*");
        return intent;
        }
        //android获取一个用于打开PDF文件的intent
        public static Intent getPdfFileIntent(File file)
        {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addCategory("android.intent.category.DEFAULT");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        Uri uri = Uri.fromFile(file);
        intent.setDataAndType(uri, "application/pdf");
        return intent;
        }
        //android获取一个用于打开文本文件的intent
        public static Intent getTextFileIntent(File file)
        {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addCategory("android.intent.category.DEFAULT");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        Uri uri = Uri.fromFile(file);
        intent.setDataAndType(uri, "text/plain");
        return intent;
        }
         
        //android获取一个用于打开音频文件的intent
        public static Intent getAudioFileIntent(File file)
        {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intent.putExtra("oneshot", 0);
        intent.putExtra("configchange", 0);
        Uri uri = Uri.fromFile(file);
        intent.setDataAndType(uri, "audio/*");
        return intent;
        }
        //android获取一个用于打开视频文件的intent
        public static Intent getVideoFileIntent(File file)
        {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intent.putExtra("oneshot", 0);
        intent.putExtra("configchange", 0);
        Uri uri = Uri.fromFile(file);
        intent.setDataAndType(uri, "video/*");
        return intent;
        }
         
         
        //android获取一个用于打开CHM文件的intent
        public static Intent getChmFileIntent(File file)
        {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addCategory("android.intent.category.DEFAULT");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        Uri uri = Uri.fromFile(file);
        intent.setDataAndType(uri, "application/x-chm");
        return intent;
        }
         
         
        //android获取一个用于打开Word文件的intent
        public static Intent getWordFileIntent(File file)
        {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addCategory("android.intent.category.DEFAULT");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        Uri uri = Uri.fromFile(file);
        intent.setDataAndType(uri, "application/msword");
        return intent;
        }
        //android获取一个用于打开Excel文件的intent
        public static Intent getExcelFileIntent(File file)
        {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addCategory("android.intent.category.DEFAULT");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        Uri uri = Uri.fromFile(file);
        intent.setDataAndType(uri, "application/vnd.ms-excel");
        return intent;
        }
        //android获取一个用于打开PPT文件的intent
        public static Intent getPPTFileIntent(File file)
        {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addCategory("android.intent.category.DEFAULT");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        Uri uri = Uri.fromFile(file);
        intent.setDataAndType(uri, "application/vnd.ms-powerpoint");
        return intent;
        }
        //android获取一个用于打开apk文件的intent
        public static Intent getApkFileIntent(File file)
        {
        Intent intent = new Intent();
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setAction(android.content.Intent.ACTION_VIEW);
        intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
        return intent;
        }
         
         
        }
    
    

    3、定义用于检查要打开的文件的后缀是否在遍历后缀数组中

        private boolean checkEndsWithInStringArray(String checkItsEnd,
        String[] fileEndings){
        for(String aEnd : fileEndings){
        if(checkItsEnd.endsWith(aEnd))
        return true;
        }
        return false;
        }
    
    

    4、通过调用OpenFiles类返回的Intent,打开相应的文件

        if(currentPath!=null&¤tPath.isFile())
        {
        String fileName = currentPath.toString();
        Intent intent;
        if(checkEndsWithInStringArray(fileName, getResources().
        getStringArray(R.array.fileEndingImage))){
        intent = OpenFiles.getImageFileIntent(currentPath);
        startActivity(intent);
        }else if(checkEndsWithInStringArray(fileName, getResources().
        getStringArray(R.array.fileEndingWebText))){
        intent = OpenFiles.getHtmlFileIntent(currentPath);
        startActivity(intent);
        }else if(checkEndsWithInStringArray(fileName, getResources().
        getStringArray(R.array.fileEndingPackage))){
        intent = OpenFiles.getApkFileIntent(currentPath);
        startActivity(intent);
         
        }else if(checkEndsWithInStringArray(fileName, getResources().
        getStringArray(R.array.fileEndingAudio))){
        intent = OpenFiles.getAudioFileIntent(currentPath);
        startActivity(intent);
        }else if(checkEndsWithInStringArray(fileName, getResources().
        getStringArray(R.array.fileEndingVideo))){
        intent = OpenFiles.getVideoFileIntent(currentPath);
        startActivity(intent);
        }else if(checkEndsWithInStringArray(fileName, getResources().
        getStringArray(R.array.fileEndingText))){
        intent = OpenFiles.getTextFileIntent(currentPath);
        startActivity(intent);
        }else if(checkEndsWithInStringArray(fileName, getResources().
        getStringArray(R.array.fileEndingPdf))){
        intent = OpenFiles.getPdfFileIntent(currentPath);
        startActivity(intent);
        }else if(checkEndsWithInStringArray(fileName, getResources().
        getStringArray(R.array.fileEndingWord))){
        intent = OpenFiles.getWordFileIntent(currentPath);
        startActivity(intent);
        }else if(checkEndsWithInStringArray(fileName, getResources().
        getStringArray(R.array.fileEndingExcel))){
        intent = OpenFiles.getExcelFileIntent(currentPath);
        startActivity(intent);
        }else if(checkEndsWithInStringArray(fileName, getResources().
        getStringArray(R.array.fileEndingPPT))){
        intent = OpenFiles.getPPTFileIntent(currentPath);
        startActivity(intent);
        }else
        {
        showMessage("无法打开,请安装相应的软件!");
        }
        }else
        {
        showMessage("对不起,这不是文件!");
        }
    
    


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  • 原文地址:https://www.cnblogs.com/loonggg/p/4981861.html
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