【Android】打开/读取文件的方法

public class IntentBuilder {
public static Intent openFile(String filePath) {
File file = new File(filePath);
if (!file.exists())
return null;
/* 取得扩展名 */
String end = file.getName().substring(file.getName().lastIndexOf(".") + 1, file.getName().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")) {
return getMusicFileIntent(filePath);
} else if (end.equals("3gp") || end.equals("mp4")) {
return getVideoFileIntent(filePath);
} else if (end.equals("jpg") || end.equals("gif") || end.equals("png") || end.equals("jpeg")
|| end.equals("bmp")) {
return getImageFileIntent(filePath);
} else if (end.equals("apk")) {
return getApkFileIntent(filePath);
} else if (end.equals("ppt")) {
return getPptFileIntent(filePath);
} else if (end.equals("xls")) {
return getExcelFileIntent(filePath);
} else if (end.equals("doc")) {
return getWordFileIntent(filePath);
} else if (end.equals("pdf")) {
return getPdfFileIntent(filePath);
} else if (end.equals("chm")) {
return getChmFileIntent(filePath);
} else if (end.equals("txt")) {
return getTextFileIntent(filePath, false);
} else {
return null;
}
}

// Android获取一个用于打开所有类型文件的intent ，会调用手机安装的全部软件
public static Intent getAllIntent(String param) {
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);
Uri uri = Uri.fromFile(new File(param));
intent.setDataAndType(uri, "*/*");
return intent;
}

// Android获取一个用于打开APK文件的intent
public static Intent getApkFileIntent(String param) {
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);
Uri uri = Uri.fromFile(new File(param));
intent.setDataAndType(uri, "application/vnd.android.package-archive");
return intent;
}

// Android获取一个用于打开VIDEO 视频文件的intent
public static Intent getVideoFileIntent(String param) {
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(new File(param));
intent.setDataAndType(uri, "video/*");
return intent;
}

// Android获取一个用于打开音频文件的intent
public static Intent getMusicFileIntent(String param) {
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(new File(param));
// 通过file文件去获得content的uri
intent.setDataAndType(uri, "audio/*");
return intent;
}

// Android获取一个用于打开Html文件的intent
public static Intent getHtmlFileIntent(String param) {
Uri uri = Uri.parse(param).buildUpon().encodedAuthority("com.android.htmlfileprovider").scheme("content").encodedPath(param).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(String param) {
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(new File(param));
intent.setDataAndType(uri, "image/*");
return intent;
}

// Android获取一个用于打开PPT文件的intent
public static Intent getPptFileIntent(String param) {
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(new File(param));
intent.setDataAndType(uri, "application/vnd.ms-powerpoint");
return intent;
}

// Android获取一个用于打开Excel文件的intent
public static Intent getExcelFileIntent(String param) {
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(new File(param));
intent.setDataAndType(uri, "application/vnd.ms-excel");
return intent;
}

// Android获取一个用于打开Word文件的intent
public static Intent getWordFileIntent(String param) {
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(new File(param));
intent.setDataAndType(uri, "application/msword");
return intent;
}

// Android获取一个用于打开CHM文件的intent
public static Intent getChmFileIntent(String param) {
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(new File(param));
intent.setDataAndType(uri, "application/x-chm");
return intent;
}

// Android获取一个用于打开文本文件的intent
public static Intent getTextFileIntent(String param, boolean paramBoolean) {
Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
if (paramBoolean) {
Uri uri1 = Uri.parse(param);
intent.setDataAndType(uri1, "text/plain");
} else {
Uri uri2 = Uri.fromFile(new File(param));
intent.setDataAndType(uri2, "text/plain");
}
return intent;
}

// Android获取一个用于打开PDF文件的intent
public static Intent getPdfFileIntent(String param) {
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(new File(param));
intent.setDataAndType(uri, "application/pdf");
return intent;
}
}

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