Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import android.app.Activity;
import android.content.Intent;
import android.widget.Toast;

public class Main {
    final static String FILENAME = "last_activity.txt";

    public static boolean startLastActivity(Activity activity) {
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(activity.openFileInput(FILENAME)));
            String nextClassName = reader.readLine();
            reader.close();

            if (null == nextClassName || nextClassName.length() < 3) {
                return false;
            }

            String currClassName = activity.getClass().getName();
            if (currClassName.equals(nextClassName)) {
                return false;
            }

            @SuppressWarnings("unchecked")
            Class<? extends Activity> clazz = (Class<? extends Activity>) Class.forName(nextClassName);
            if (null == clazz) {
                return false;
            }

            Intent i = new Intent(activity, clazz);
            activity.startActivity(i);
            activity.finish();
            reader.close();

            return true;
        } catch (Exception e) {
            Toast.makeText(activity, "startLastActivity: " + e, Toast.LENGTH_LONG).show();
        }
        return false;
    }

    public static void startActivity(Activity current, Class<? extends Activity> next) {
        saveActivity(current, next);
        Intent i = new Intent(current, next);
        current.startActivity(i);
        current.finish();
    }

    private static void saveActivity(Activity activity, Class<? extends Activity> clazz) {
        FileOutputStream fos = null;
        try {
            fos = activity.openFileOutput(FILENAME, Activity.MODE_PRIVATE);
            fos.write(clazz.getName().getBytes());
        } catch (Exception e) {
            Toast.makeText(activity, "saveActivity: " + e, Toast.LENGTH_LONG).show();
        } finally {
            if (null != fos)
                try {
                    fos.close();
                } catch (Exception e) {
                }
        }
    }
}