android-常见控件的使用方法

1.常见控件的使用方法

常见的控件有:TextView,Button,EditText,ImageView,ProgressBar,AlertDialog,ProgressDialog，以下位这些控件的常见使用方法，代码中有重要注释：
activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<TextView
android:id="@+id/text_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="24sp"
android:textColor="#00ff00"
android:gravity="center"
android:text="@string/text_view" />

<Button
android:id="@+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button"
/>

<EditText
android:id="@+id/edit_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:maxLines="2"
android:hint="Type someing here"/>

<ImageView
android:id="@+id/image_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher"/>

<ProgressBar
android:id="@+id/progress_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyleHorizontal"
android:max="100"
/>
</LinearLayout>

MainActivity.java

package com.king.uiwidgettest;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
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 EditText editText;
private Button button;
private ImageView imageView;
private ProgressBar progressBar;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//注意一定要放在setContentView之上
requestWindowFeature(Window.FEATURE_NO_TITLE);
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:
//注意图片名称最好有下划线，而且名称小写，否则报错
//imageView.setImageResource(R.drawable.ic_newimg);
int progress = progressBar.getProgress();
progress = progress+10;
System.out.println("==========aaaaaaaaaaa============"+progress);
System.out.println("==========aaaaaaaaaaa============"+progressBar.getVisibility());
if(progress == 110){
progressBar.setVisibility(View.GONE);
}else{
progressBar.setProgress(progress);
}

/*	AlertDialog.Builder dialog = new AlertDialog.Builder(this);
dialog.setTitle("This is adialog");
dialog.setMessage("error");
dialog.setCancelable(false);//表示不能通过back键取消
dialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub

}
});
dialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub

}
});
dialog.show();*/

ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setTitle("This is ProgressDialog");
progressDialog.setMessage("loading......");
progressDialog.setCancelable(true);
progressDialog.show();

/*
if(progressBar.getVisibility() == View.GONE){
progressBar.setVisibility(View.VISIBLE);
}else{
progressBar.setVisibility(View.GONE);
}*/
/*String inputText = editText.getText().toString();
Toast.makeText(MainActivity.this, inputText, Toast.LENGTH_SHORT).show();*/

break;

default:
break;
}

}
}

代码下载地址：http://download.csdn.net/detail/wangxuewei111/8569045