文件预览工具类

import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.widget.Toast;

import com.xuehu365.xuehu.R;
import com.xuehu365.xuehu.ui.widget.AlertDialog;

import java.io.File;

/**
 * Created by David on 2016/8/17.
 */
public class FileOpenIntentHelp {

    //android获取一个用于打开文件的intent
    public static Intent getFileIntent(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, "*/*");
        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获取一个用于打开文本文件的intent
    public static Intent getTextFileIntent(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, "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;
    }

    //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;
    }

    /**
     * 使用intent打开文件
     *
     * @param fileFullName
     * @param fileExt
     * @param context
     */
    public static void openFile(String fileFullName, String fileExt, Context context) {
        try {
            if (FileMIMEHelp.checkEndsWithInStringArray(fileFullName, context.getResources().getStringArray(R.array.fileEndingPdf))) {
                Intent fileIntent = FileOpenIntentHelp.getPdfFileIntent(fileFullName);
                context.startActivity(fileIntent);
            } else if (FileMIMEHelp.checkEndsWithInStringArray(fileFullName, context.getResources().getStringArray(R.array.fileEndingText))) {
                Intent fileIntent = FileOpenIntentHelp.getTextFileIntent(fileFullName);
                context.startActivity(fileIntent);
            } else if (FileMIMEHelp.checkEndsWithInStringArray(fileFullName, context.getResources().getStringArray(R.array.fileEndingPPT))) {
                Intent fileIntent = FileOpenIntentHelp.getPptFileIntent(fileFullName);
                context.startActivity(fileIntent);
            } else if (FileMIMEHelp.checkEndsWithInStringArray(fileFullName, context.getResources().getStringArray(R.array.fileEndingWord))) {
                Intent fileIntent = FileOpenIntentHelp.getWordFileIntent(fileFullName);
                context.startActivity(fileIntent);
            } else if (FileMIMEHelp.checkEndsWithInStringArray(fileFullName, context.getResources().getStringArray(R.array.fileEndingExcel))) {
                Intent fileIntent = FileOpenIntentHelp.getExcelFileIntent(fileFullName);
                context.startActivity(fileIntent);
            } else {
                Intent fileIntent = FileOpenIntentHelp.getFileIntent(fileFullName);
                context.startActivity(fileIntent);
            }


        } catch (NullPointerException e) {
            new AlertDialog(context).builder().setTitle("文件损坏").setMsg("文件不存在或文件已损坏！").setPositiveButton("好", null).show();
        } catch (ActivityNotFoundException e) {
            Toast.makeText(context, "找不到合适的应用打开该文件。请安装合适应用", Toast.LENGTH_SHORT).show();
        } catch (Exception e) {
            Toast.makeText(context, "打开文件发生错误", Toast.LENGTH_SHORT).show();
        }
    }

    /**
     * 文件是否存在
     *
     * @param fileFullName
     * @return
     */
    public static boolean isFileExist(String fileFullName) {
        boolean b = false;
        try {
            File file = new File(fileFullName);
            if (file.exists()) {
                b = true;
            }
        } catch (Exception e) {
            b = false;
        }
        return b;
    }
}