《第一行代码——Android》作者郭霖源码

http://www.android-doc.com/index.html

【3】第3章　软件也要拼脸蛋，UI开发的点点滴滴

【3.1】UIWidgetTest

package com.example.uiwidgettest;

import android.support.v7.app.ActionBarActivity;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Toast;


public class MainActivity extends Activity implements OnClickListener{

	private Button button1;
	private EditText editText;
	private ImageView imageView;
	private ProgressBar progressBar;
	
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        button1 = (Button) findViewById(R.id.button);
        editText = (EditText) findViewById(R.id.edit_text);
        imageView = (ImageView) findViewById(R.id.image_view);
        progressBar = (ProgressBar) findViewById(R.id.progress_bar);
        
        button1.setOnClickListener(this);	//实现方式二
/*        
        //实现方式一 
        button.setOnClickListener(new View.OnClickListener() {
	        @Override
	        public void onClick(View v) {
	        // 在此处添加逻辑
	        }
        });
*/       
    }

    //实现方式二
    public void onClick(View v) 
    {
    	switch (v.getId()) 
    	{
    		case R.id.button:
    			//将输入框的内容显示出来
    			String inputText = editText.getText().toString();
    			Toast.makeText(MainActivity.this, inputText,
    			Toast.LENGTH_SHORT).show();
    			
    			//显示图片
    			imageView.setImageResource(R.drawable.jelly_bean);
    			
/*    			//显示和隐藏进度圆圈
    			if (progressBar.getVisibility() == View.GONE) 
    			{
    				progressBar.setVisibility(View.VISIBLE);
    			} 
    			else 
    			{
    				progressBar.setVisibility(View.GONE);
    			}
			
    			//进度条改为长条形
    			int progress = progressBar.getProgress();
    			progress = progress + 10;
    			progressBar.setProgress(progress);
    			
    			//提醒弹出框
    			AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);
    			dialog.setTitle("This is Dialog");
    			dialog.setMessage("Something important.");
    			dialog.setCancelable(false);
    			dialog.setPositiveButton("OK", new DialogInterface.OnClickListener() 
    			{   			
					@Override
					public void onClick(DialogInterface dialog, int which) {
						
					}
					});
					dialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int which) {
						
					}
    			});
    			dialog.show();
*/        						
    			//进度条	
    			ProgressDialog progressDialog = new ProgressDialog(MainActivity.this);
    			progressDialog.setTitle("This is ProgressDialog");
    			progressDialog.setMessage("Loading...");
    			progressDialog.setCancelable(true);
    			progressDialog.show();
    			
    						
	    		break;
	    	default:
	    		break;
    	}
    }

}