Android--使用Intent打开各种文件

1.自定义android Intent类，可用于获取打开以下文件的intent：PDF,PPT,WORD,EXCEL,CHM,HTML,TEXT,AUDIO,VIDEO
2.错误事例
Intent it = getPdfFileIntent(“file:///android_asset/helphelp.pdf”);
原因:可能是因为程序没有权限访问其它APK里的asset文件夹下的资源文件,又或者是路径写错。

import android.content.Intent;
import android.net.Uri;

import java.io.File;


public class MyIntent {

    //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获取一个用于打开音频文件的intent
    public static Intent getAudioFileIntent( 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, "audio/*");
        return intent;
    }
    //android获取一个用于打开视频文件的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;
    }
}