Android Open Source - android-002 Main Activity

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License

The source code is released under:
Apache License
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Java Source Code

package com.michaelfitzmaurice.android.modernart;
/*  w  ww .j  a  v a  2 s  .  co m*/
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class MainActivity extends Activity {
  
  private static final String TAG = "Lab-ModernArtUi";
  
  List<View> mutableViews = new ArrayList<View>();
  SeekBar seekBar;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
    View view4 = findViewById(R.id.LinearLayout4);
    view4.setBackgroundColor(0xFF5500AA);
    mutableViews.add(view4);
    
    View view5 = findViewById(R.id.LinearLayout5);
    view5.setBackgroundColor(0xFF880044);
    mutableViews.add(view5);
    
    View view6 = findViewById(R.id.LinearLayout6);
    view6.setBackgroundColor(0xFFFF0000);
    mutableViews.add(view6);
    
    View view7 = findViewById(R.id.LinearLayout7);
    view7.setBackgroundColor(0xFFFFFFFF);
    
    View view8 = findViewById(R.id.LinearLayout8);
    view8.setBackgroundColor(0xFF0000FF);
    mutableViews.add(view8);
    
    seekBar = (SeekBar)findViewById(R.id.seekBar1);
    seekBar.setOnSeekBarChangeListener( new OnSeekBarChangeListener() {
      
      @Override
      public void onStopTrackingTouch(SeekBar seekBar) {
        // do nothing
      }
      
      @Override
      public void onStartTrackingTouch(SeekBar seekBar) {
        // do nothing
      }
      
      @Override
      public void onProgressChanged(SeekBar seekBar, 
                    int progress,
                    boolean fromUser) {
        Log.d(TAG, "SeekBar moved to " + progress);
        modifyMutableViewColours(progress);
      }
    });
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_more_info) {
      showMoreInfoDialog();
      return true;
    }
    return super.onOptionsItemSelected(item);
  }
  
  private void modifyMutableViewColours(int greenValue) {
    
    for (View view : mutableViews) {
      ColorDrawable bg = (ColorDrawable) view.getBackground();
      int color = bg.getColor();
      int red = Color.red(color);
      int green = Color.green(color);
      int blue = Color.blue(color);
      Log.d(TAG, "Starting RGB values for view " + view.getId() 
          + " : " + red + "," + green + "," + blue);
      int newColour = Color.rgb(red, greenValue, blue);
      view.setBackgroundColor(newColour);
    }
  }
  
  private void showMoreInfoDialog() {
    
    AlertDialog.Builder alertDialogBuilder = 
      new AlertDialog.Builder(this);
    alertDialogBuilder
      .setMessage(R.string.more_info_text)
      .setCancelable(false)
      .setPositiveButton(R.string.more_info_learn_more, 
              new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog,int id) {
          openMoreInfoLink();
        }
      })
      .setNegativeButton(R.string.more_info_cancel,
              new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog,int id) {
          dialog.cancel();
        }
      });
    alertDialogBuilder.create().show();
  }
  
  private void openMoreInfoLink() {
    
    Intent intent = new Intent(Intent.ACTION_VIEW);
    Uri uri = Uri.parse( getString(R.string.more_info_url) );
    Log.d(TAG, "Opening link to " + uri + " ...");
    intent.setData(uri);
    startActivity(intent);
  }
}
Java Source Code List
