HelpActivity.java

package com.example.ipcplayer.activity;

import java.util.ArrayList;

import com.example.ipcplayer.R;
import com.example.ipcplayer.widget.CellLayout;
import com.example.ipcplayer.widget.DocIndicator;
import com.example.ipcplayer.widget.Workspace;
import com.example.ipcplayer.widget.Workspace.IWorkspaceListener;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.widget.ImageView;
import android.widget.TextView;
import android.view.View.OnClickListener;

public class HelpActivity extends Activity implements IWorkspaceListener{
	private static final String TAG = HelpActivity.class.getSimpleName();
	private static final int CELL_NUMBER = 4;
	private Workspace mWorkspace;
	private DocIndicator mDocIndicator;
	private TextView mStartTV;
	
	private boolean mExited;
	private ArrayList<CellLayout> mCellList = new ArrayList<CellLayout>();

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.help);
		
		setupViews();
		updateIndicatorFromWorkspace();
	}

	private void setupViews(){
		mWorkspace = (Workspace) findViewById(R.id.help_workspace);
		mDocIndicator = (DocIndicator) findViewById(R.id.help_indicator);
		mStartTV = (TextView) findViewById(R.id.start);
		mStartTV.setOnClickListener(new OnClickListener(){

			@Override
			public void onClick(View v) {
				mExited = true;
				doStartActivity();
			}
			
		});
		
		mWorkspace.setWorkspaceListener(this);
		initCells();
	}
	
	private void initCells(){
		mWorkspace.addView(this.createCellLayout(R.drawable.welcome_1));
		mWorkspace.addView(this.createCellLayout(R.drawable.welcome_2));
		mWorkspace.addView(this.createCellLayout(R.drawable.welcome_3));
		mWorkspace.addView(this.createCellLayout(R.drawable.welcome_4));
	}
	
	private void updateIndicatorFromWorkspace(){
		mDocIndicator.setTotal(mWorkspace.getChildCount());
		mDocIndicator.setCurrent(mWorkspace.getCurrentScreen());
	}
	
	private void doStartActivity(){
		Intent intent = new Intent(this, MainActivity.class);
		this.startActivity(intent);
		finish();
	}
	
	private CellLayout createCellLayout(int resId){
		CellLayout cellLayout = (CellLayout) getLayoutInflater().from(this).inflate(R.layout.help_item, null);
		ImageView image = (ImageView) cellLayout.findViewById(R.id.help_item_img);
		image.setImageResource(resId);
		mCellList.add(cellLayout);
		return cellLayout;
	}
	
	private void hideStartButton(){
		mStartTV.setVisibility(View.GONE);
	}
	
	private void showStartButton(){
		mStartTV.setVisibility(View.VISIBLE);
	}
	
	@Override
	protected void onDestroy() {
		super.onDestroy();
	}

	@Override
	public void onUpdateTotalNum(int total) {
		if(mDocIndicator != null){
			mDocIndicator.setTotal(total);
		}
	}

	@Override
	public void onUpdateCurrent(int current) {
		if(mDocIndicator != null){
			mDocIndicator.setCurrent(current);
		}
		if(current >= CELL_NUMBER -1){
			showStartButton();
		}else{
			hideStartButton();
		}
	}
	
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK) {// 屏蔽回退键
			mExited = true;
			doStartActivity();
			return true;
		}

		return super.onKeyDown(keyCode, event);
	}
	
}