Android成长的故事——Android组件_ TextView && EditView

Android组件中TextView是最常见的一种组件，虽然常用，但不可或缺。

UI组件TextView

属性：android:autoLink

我们用一个实例来解释这个属性

首先在strings.xml里写出我们需要的字符串。

 
    TextViewTest
    百度：http://baidu.com
    我的：[email protected]
    电话号码：10086
    百度：http://baidu.com 我的：[email protected]
 

然后在我们的main.xml里声明属性

-------------------Activity------------

package cn.class3g.activity;
 
import android.app.Activity;
import android.os.Bundle;
import android.text.Html;
import android.widget.TextView;
 
public class TextViewTestActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
 
       TextView tv = (TextView) this.findViewById(R.id.tvId);
       String htmlStr = "我爱你"
              + "百度";
       tv.setText(Html.fromHtml(htmlStr));
    }
}

注意：

android:autoLink=”email” ：会出现unsupported action，可能是模拟器bug，须探究。

另外使用Html.fromHtml时，超链接只具备外观，不能跳转

效果图：

自定义带边框的TextView

------------------------Activity------------------

package cn.class3g.activity;
 
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.TextView;
 
public class MyBorderTextView extends TextView{
 
      public MyBorderTextView(Context context, AttributeSet attrs) {
           super(context, attrs);
          
      }
      @Override
      protected void onDraw(Canvas canvas) {
           super.onDraw(canvas);
          
           Paint paint = new Paint();
          
           paint.setColor(android.graphics.Color.YELLOW);
          
 
           canvas.drawLine(0, 0, this.getWidth()-1, 0, paint);
//1、横坐标0到this.getWidth()-1，纵坐标0到0
           canvas.drawLine(0, 0, 0, this.getHeight()-1, paint);
//2、横坐标0到0，纵坐标0到this.getHeight()-1
           canvas.drawLine(this.getWidth()-1, 0, this.getWidth()-1, this.getHeight()-1, paint);
//3、横坐标this.getWidth()-1到this.getWidth()-1，纵坐标0到this.getHeight()-1
           canvas.drawLine(0, this.getHeight()-1, this.getWidth()-1, this.getHeight()-1, paint);
//4、横坐标0到this.getWidth()-1，纵坐标this.getHeight()-1到this.getHeight()-1
      }
 
}

然后只需要在布局里调用这个就行

效果图：

输入特定字符

效果图：

--------------------------strings.xml---------------

 
    Hello World, ZhuCeActivity!
    ZhuCe
    用户名：
    密码：
    确认密码：
    电子邮箱：
    验证码：
    看不清？换一个
    我已经阅读并同意协议
   

自动完成输入内容的组件

package cn.class3g.activity;
 
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.MultiAutoCompleteTextView;
 
public class AutoActivity extends Activity{
   AutoCompleteTextView auto = null;
   MultiAutoCompleteTextView mauto = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        findViews();
        String[] str = {"abc","add","aas","afr","bdr","ber","bsd"};
        ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_dropdown_item_1line,str);
       
        auto.setAdapter(adapter);
       
        //----------------------
        mauto.setAdapter(adapter);
        mauto.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
       
    }
    private void findViews(){
      auto = (AutoCompleteTextView) this.findViewById(R.id.autoId);
      mauto = (MultiAutoCompleteTextView) this.findViewById(R.id.mautoId);
    }
}

EditText中回车键的使用

为EditText对象的注册OnKeyListener事件，实现onKey（）方法

package cn.class3g.activity;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.widget.Button;
import android.widget.EditText;
 
public class EditTextTest1Activity extends Activity implements OnKeyListener{
    /** Called when the activity is first created. */
   Button but = null;
   EditText et = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.onkey);
        findView();
    }
    public void findView(){
      but = (Button) this.findViewById(R.id.buttonId);
      et = (EditText) this.findViewById(R.id.edit);
      et.setOnKeyListener(this);
    }
 
   @Override
   public boolean onKey(View v, int keyCode, KeyEvent event) {
      // TODO Auto-generated method stub
      if(keyCode==KeyEvent.KEYCODE_ENTER){
        but.setText(et.getText());
        et.setVisibility(View.GONE);
        but.setVisibility(View.VISIBLE);
      }
      return false;
   }
}

2011年12月13日