Android Open Source - Android-Display-Images-from-SD-Card-Tutorial Main Activity

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License

The source code is released under:

Apache License

Java Source Code

package com.androidbegin.sdimagetutorial;
//  w  ww  .  jav a 2s  .c  o m
import java.io.File;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.MenuItem.OnMenuItemClickListener;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

public class MainActivity extends Activity {

  // Declare variables
  private String[] FilePathStrings;
  private String[] FileNameStrings;
  private File[] listFile;
  GridView grid;
  LazyAdapter adapter;
  File file;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gridview_main);

    // Check for SD Card
    if (!Environment.getExternalStorageState().equals(
        Environment.MEDIA_MOUNTED)) {
      Toast.makeText(this, "Error! No SDCARD Found!", Toast.LENGTH_LONG)
          .show();
    } else {
      // Locate the image folder in your SD Card
      file = new File(Environment.getExternalStorageDirectory()
          + File.separator + "SDImageTutorial");
      // Create a new folder if no folder named SDImageTutorial exist
      file.mkdirs();
    }

    if (file.isDirectory()) {
      listFile = file.listFiles();
      // List file path for Images
      FilePathStrings = new String[listFile.length];
      // List file path for Image file names
      FileNameStrings = new String[listFile.length];

      for (int i = 0; i < listFile.length; i++) {
        // Get the path
        FilePathStrings[i] = listFile[i].getAbsolutePath();
        // Get the name
        FileNameStrings[i] = listFile[i].getName();
      }
    }

    // Locate the GridView in main.xml
    grid = (GridView) findViewById(R.id.gridview);
    // Pass results to LazyAdapter Class
    adapter = new LazyAdapter(this, FilePathStrings, FileNameStrings);
    // Binds the Adapter to the GridView
    grid.setAdapter(adapter);

    // Capture button clicks on gridview items
    grid.setOnItemClickListener(new OnItemClickListener() {

      @Override
      public void onItemClick(AdapterView<?> parent, View view,
          int position, long id) {
        // Send single item click data to ViewImage Class
        Intent i = new Intent(getApplicationContext(), ViewImage.class);
        // Pass all the filepaths
        i.putExtra("filepath", FilePathStrings);
        // Pass all the filenames
        i.putExtra("filename", FileNameStrings);
        // Pass a single position
        i.putExtra("position", position);
        // Open ViewImage.java Activity
        startActivity(i);
      }

    });
  }

  // Create an Actionbar menu
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {

    // Menu Title
    menu.add("Clear Cache")
        .setOnMenuItemClickListener(this.ClearCacheButtonClickListener)
        .setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);

    return super.onCreateOptionsMenu(menu);
  }

  // Capture Button Click
  OnMenuItemClickListener ClearCacheButtonClickListener = new OnMenuItemClickListener() {
    public boolean onMenuItemClick(MenuItem item) {

      // Calls the clearCache function in ImageLoader Class
      adapter.imageLoader.clearCache();
      // Reload the GridView
      adapter.notifyDataSetChanged();
      return false;

    }
  };
}

Java Source Code List

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