Android登录界面设计1(纯java)

 Android登录界面设计1(纯java)_第1张图片

 

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.InputType;
import android.text.TextWatcher;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*;

public class LoginUI1 extends Activity {
   
	private LinearLayout mainLayout=null;
	private RelativeLayout layout1=null;	
	private TextView tv11=null;		//请输入账号		
	private TextView tv12=null;		//显示账号可输入剩余字符数
	private EditText et1=null;		//账号框
	private RelativeLayout layout2=null;
	private TextView tv21=null;		//请输入密码
	private TextView tv22=null;		//显示密码可输入剩余字符数
	private EditText et2=null;		//密码输入框
	private LinearLayout layout3=null;
	private Button button1=null;	//按钮1:取消
	private Button button2=null;    //按钮2:登陆
    
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mainLayout_init();
        setContentView(mainLayout);
    }
    /*mainLayout初始化*/
    void mainLayout_init(){
    	mainLayout=new LinearLayout(this);
    	LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1, -1);
    	mainLayout.setLayoutParams(lp);
    	mainLayout.setOrientation(LinearLayout.VERTICAL);
    	layout1_init();
    	mainLayout.addView(layout1);
    	et1_init();
    	mainLayout.addView(et1);
    	layout2_init();
    	mainLayout.addView(layout2);
    	et2_init();
    	mainLayout.addView(et2);
    	layout3_init();
    	mainLayout.addView(layout3);
    }
    /*layout1初始化*/
    void layout1_init(){
    	layout1=new RelativeLayout(this);
    	RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-1, -2);
    	layout1.setLayoutParams(lp);
    	tv11_init();
    	layout1.addView(tv11);
    	tv12_init();
    	layout1.addView(tv12);
    }
    /*tv11初始化*/
    void tv11_init(){
    	tv11=new TextView(this);
    	RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-2, -2);
    	lp.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
    	tv11.setLayoutParams(lp);
    	tv11.setTextSize(30);
    	tv11.setText("请输入账号:");
    }
    /*tv12初始化*/
    void tv12_init(){
    	tv12=new TextView(this);
    	RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-2, -2);
    	lp.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
    	tv12.setLayoutParams(lp);
    	tv12.setTextSize(30);
    	tv12.setText("12");
    }
    /*et1初始化*/
    void et1_init(){
    	et1=new EditText(this);
    	LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1,-2);
    	et1.setLayoutParams(lp);
    	et1.setSingleLine(true);
    	TextWatcher tw=new TextWatcher(){
			public void afterTextChanged(Editable s) {
				//限制输入
				if(et1.length()>12){
					//截取字符串,舍弃最后一个
					et1.setText((et1.getText()).subSequence(0, 12));
					//设置光标。由于用setText函数会导致光标复位,所以重新设置光标到末尾
					et1.setSelection(12);
				}
				//显示剩余可输入字符数
				tv12.setText(String.valueOf(12-et1.length()));
			}
			public void beforeTextChanged(CharSequence s, int start, int count,int after) {}
			public void onTextChanged(CharSequence s, int start, int before,int count) {}
    	};
    	et1.addTextChangedListener(tw);
    }
    /*layout2初始化*/
    void layout2_init(){
    	layout2=new RelativeLayout(this);
    	LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1, -2);
    	layout2.setLayoutParams(lp);
    	tv21_init();
    	layout2.addView(tv21);
    	tv22_init();
    	layout2.addView(tv22);
    }
    /*tv21初始化*/
    void tv21_init(){
    	tv21=new TextView(this);
    	RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-2, -2);
    	lp.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
    	tv21.setLayoutParams(lp);
    	tv21.setTextSize(30);
    	tv21.setText("请输入密码:");
    }
    /*tv22初始化*/
    void tv22_init(){
    	tv22=new TextView(this);
    	RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-2, -2);
    	lp.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
    	tv22.setLayoutParams(lp);
    	tv22.setTextSize(30);
    	tv22.setText("12");
    }
    /*et2初始化*/
    void et2_init(){
    	et2=new EditText(this);
    	LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1, -2);
    	et2.setLayoutParams(lp);
    	et2.setSingleLine();
    	//设置输入模式为密码模式
    	et2.setInputType(InputType.TYPE_CLASS_TEXT|InputType.TYPE_TEXT_VARIATION_PASSWORD);
    	TextWatcher tw=new TextWatcher(){
			public void afterTextChanged(Editable s) {
				//限制输入
				if(et2.length()>12){
					//截取字符串,舍弃最后一个
					et2.setText((et2.getText()).subSequence(0, 12));
					//设置光标。由于用setText函数会导致光标复位,所以重新设置光标到末尾
					et2.setSelection(12);
				}
				//显示剩余可输入字符数
				tv22.setText(String.valueOf(12-et2.length()));
			}
			public void beforeTextChanged(CharSequence s, int start, int count,int after) {}
			public void onTextChanged(CharSequence s, int start, int before,int count) {}
    	};
    	et2.addTextChangedListener(tw);
    }
    /*layout3初始化*/
    void layout3_init(){
    	layout3=new LinearLayout(this);
    	LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1,-2);
    	layout3.setLayoutParams(lp);
    	layout3.setOrientation(LinearLayout.HORIZONTAL);
    	button1_init();
    	layout3.addView(button1);
    	button2_init();
    	layout3.addView(button2);
    }
    /*button1初始化*/
    void button1_init(){
    	button1=new Button(this);
    	LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-2, -2);
    	button1.setLayoutParams(lp);
    	button1.setTextSize(30);
    	button1.setText("取消");
    	OnClickListener ol=new OnClickListener(){
			public void onClick(View v) {
				//此处做“取消”事件处理
			}
    	};
    	button1.setOnClickListener(ol);
    }
    /*button2初始化*/
    void button2_init(){
    	button2=new Button(this);
    	LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1, -2);
    	button2.setLayoutParams(lp);
    	button2.setTextSize(30);
    	button2.setText("登录");
    	OnClickListener ol=new OnClickListener(){
			public void onClick(View v) {
				//此处做“登陆”事件处理
			}
    	};
    	button2.setOnClickListener(ol);
    }
    
}

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