1. Android里面，要打开各种类型的文件，例如PDF,PPT,WORD,EXCEL,CHM,HTML,TEXT,AUDIO,VIDEO ，可以通过Intent来办到。
整理了一个Intent的工具类：
import java.io.File;import android.content.Intent;import android.net.Uri;//PDF,PPT,WORD,EXCEL,CHM,HTML,TEXT,AUDIO,VIDEO //示例: //Intent it = getTextFileIntent("/sdcard/hello.txt",false); //startActivity(it); public class OpenFileIntent { // 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; }}?
2.?如果没有使用UncaughtExceptionHandler类来处理全局异常，那么程序将异常退出造成不好的用户体验。为了防止ActivityNotFoundException错误的出现，在启动Activity之前先判断Intent是否存在。
public static boolean isIntentAvailable(Context context, Intent intent) { final PackageManager packageManager = context.getPackageManager(); List<ResolveInfo> list = packageManager.queryIntentActivities(intent, PackageManager.GET_ACTIVITIES); return list.size() > 0;}?