<android>第一行代码第三章源码整理

1:UIWidgettest

package com.example.uiwidgettest;import android.app.Activity;import android.app.AlertDialog;import android.app.ProgressDialog;import android.content.DialogInterface;import android.os.Bundle;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 button;    private EditText editText;    private ImageView imageView;    private ProgressBar progressBar;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button = (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);        button.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()) {        case R.id.button:        //¸´ÖÆÎı¾        //  String inputText=editText.getText().toString();        //  Toast.makeText(MainActivity.this, inputText, Toast.LENGTH_LONG).show();        //±ä»»Í¼Æ¬        //  imageView.setImageResource(R.drawable.jelly_bean);        // ½ø¶ÈÌõ        //  int progress =progressBar.getProgress();        //  progress=progress + 10;        //  progressBar.setProgress(progress);        //½ø¶ÈÌõÏûʧ            if (progressBar.getVisibility()==View.GONE){                progressBar.setVisibility(View.VISIBLE);                }            else{                progressBar.setVisibility(View.GONE);            }            break;        default:            break;        }    }}