在寫文件管理系統時會用到各種打開不同格式的文件的需求,由於Android系統默認內置了一些可以打開的系統應用,但還是不能滿足需求,比如打開視頻文件、word等,需要安裝相應的播放軟件纔可以使用,這時程序會通過Intent查找可以使用的軟件
實現通過代碼打開一個文件需要2部分,一部分是要獲取到不同文件的後綴,以便根據需求匹配相應的Intent,另一個就是不同格式的文件打開的Intent不同
1、在values目錄下定義後綴數組文件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>.pdf</item>
</array>
</resources>
2、定義OpenFiles工具類,只需傳輸File參數即可,然後通過返回的Intent打開文件
public class OpenFiles {
//android獲取一個用於打開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獲取一個用於打開圖片文件的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獲取一個用於打開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獲取一個用於打開文本文件的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獲取一個用於打開音頻文件的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獲取一個用於打開視頻文件的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獲取一個用於打開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獲取一個用於打開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獲取一個用於打開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獲取一個用於打開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獲取一個用於打開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、定義用於檢查要打開的文件的後綴是否在遍歷後綴數組中
private boolean checkEndsWithInStringArray(String checkItsEnd,
String[] fileEndings){
for(String aEnd : fileEndings){
if(checkItsEnd.endsWith(aEnd))
return true;
}
return false;
}
4、通過調用OpenFiles類返回的Intent,打開相應的文件
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);
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("無法打開,請安裝相應的軟件!");
}
}else
{
showMessage("對不起,這不是文件!");
}