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License

The source code is released under:

MIT License

Java Source Code

package co.vrcode.util;
/* ww  w .ja va2  s .c o m*/
import java.io.File;
import java.util.List;

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.os.Environment;



/**
 * Misc. Android Utilities
 * 
 * @author VRCode
 *
 */
public class Android {
  private static boolean[] sdCardState;


  /**
   * Checks if there are Activities available to respond to
   * the passed Intent
   * 
   * @param intent  Intent to check
   * @param context  Context for Activity checking the Intent
   * 
   * @return   true if at least one Activity is available to respond
   *       to the Intent
   * 
   */
  public static boolean willIntentOpen(Intent intent, Context context) {
    PackageManager pm = context.getPackageManager();

    List<ResolveInfo> activities = pm.queryIntentActivities(
      intent,
      PackageManager.MATCH_DEFAULT_ONLY
    );

    return activities.size() > 0;
  }


  /**
   * Creates an Intent that can be used to start an Activity
   * that will open the file passed
   * 
   * @param file    File for which the Intent is needed
   * @param context  Context for the Activity requesting the Intent
   * 
   * @return   An Intent that can be used to start an Activity that
   *       can process the file
   * 
   */
  public static Intent getViewIntentForFile(String file, Context context) {
    String mime = FileSystem.getMimeType(file);

    Intent intent =  new Intent()
      .setAction(android.content.Intent.ACTION_VIEW)
      .setDataAndType(
        Uri.fromFile(new File(file)),
        mime
      );

    PackageManager pm = context.getPackageManager();
    List<ResolveInfo> activities = pm.queryIntentActivities(
      intent,
      PackageManager.MATCH_DEFAULT_ONLY
    );

    if (activities.size() == 0) { 
      intent.setDataAndType(
        Uri.fromFile(new File(file)),
        "*/*"
      );
    }

    return intent;
  }


  /**
   * Checks if the SD Card is available
   * 
   * @return true if it's possible to access the SD Card
   * 
   */
  public static boolean isSDCardAvailable() {
    return getSDCardState()[0];
  }


  /**
   * Checks write access to the SD Card
   * 
   * @return true if it's possible to write to the SD Card
   * 
   */
  public static boolean canWriteToSDCard() {
    return getSDCardState()[1];
  }


  /**
   * Returns SD Card's Access Info
   * 
   *  @return Array with element 0 being mounted (true) or not (false), 
   *       and element 1 weather there is Read-Write access (true)
   *       or Read-Only (false)
   */
  private static boolean[] getSDCardState() {
    if (sdCardState != null) {
      return sdCardState;
    }

    sdCardState = new boolean[2];

    String cardState = Environment.getExternalStorageState();

    if (Environment.MEDIA_MOUNTED.equals(cardState)) {
      sdCardState[0] = sdCardState[1] = true;
    } else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(cardState)) {
      sdCardState[0] = true;
      sdCardState[1] = false;
    } else {
      sdCardState[0] = sdCardState[1] = false;
    }

    return sdCardState;
  }


  /**
   * Returns "true" if the current device is a tablet,
   * false otherwise
   * 
   * @return  True if the current device is a tablet
   */
  public static boolean isTablet() {
    return false;
    // TODO: Implement Tablet Detection

  }

}

Java Source Code List

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