今天做的就是在界面输入用户名和密码，如果正确的话显示登陆成功，否则就是失败了！

界面很挫，就是很挫！

输入用户名：Android

密码：2014

结果如下：

接着重置，返回原来图片！

如果密码错误呢？

点重置返回原来界面！

接着长按图标按钮，就出现动态textview！

具体代码如下：

xmlns:tools="http://schemas.android.com/tools"

android:id="@+id/LinearLayout1"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context="com.example.practice2.MainActivity$PlaceholderFragment" >

android:id="@+id/editText1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginLeft="35dp"

android:layout_marginTop="34dp"

android:ems="10"

android:gravity="center" />

android:id="@+id/editText2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginLeft="35dp"

android:layout_marginTop="34dp"

android:ems="10"

android:gravity="center"

android:inputType="textPassword" />

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="25dp"

android:gravity="center"

android:text="您好，请输入用户名和密码" />

android:layout_width="match_parent"

android:layout_height="wrap_content" >

android:id="@+id/button1"

android:layout_width="wrap_content"

android:layout_height="match_parent"

android:layout_weight="0.53"

android:text="重置" />

android:id="@+id/imageButton1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="0.47"

android:src="@drawable/ic_launcher" />

android:id="@+id/textView2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginBottom="16dp"

android:text="" />

后代：

package com.example.practice2;

import android.support.v7.app.ActionBarActivity;

import android.support.v4.app.Fragment;

import android.content.Context;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.View.OnLongClickListener;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.EditText;

import android.widget.ImageButton;

import android.widget.LinearLayout;

import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

EditText account = null;

EditText code = null;

ImageButton ibtn = null;

Button btn = null;

TextView information = null;

TextView mcont = null;

Context cont = null;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.fragment_main);

account = (EditText) findViewById(R.id.editText1);

code = (EditText) findViewById(R.id.editText2);

ibtn = (ImageButton) findViewById(R.id.imageButton1);

btn = (Button) findViewById(R.id.button1);

information = (TextView) findViewById(R.id.textView1);

mcont =(TextView) findViewById(R.id.textView2);

cont = this;

mcont = new TextView(cont);

mcont.setText("万万没想到");

//ibtn = new ImageButton(this);

ibtn.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

String username = ((EditText)findViewById(R.id.editText1)).getText().toString();

String pwd = ((EditText)findViewById(R.id.editText2)).getText().toString();

if(username.equals("android")&&pwd.equals("2014")){

ibtn.setImageDrawable(getResources().getDrawable(R.drawable.state1));

account.setVisibility(View.GONE);

code.setVisibility(View.GONE);

information.setText("用户名密码正确");

}

else{

ibtn.setImageDrawable(getResources().getDrawable(R.drawable.state2));

account.setVisibility(View.GONE);

code.setVisibility(View.GONE);

information.setText("用户名密码错误");

}

}

});

ibtn.setOnLongClickListener(new OnLongClickListener(){

@Override

public boolean onLongClick(View v) {

// TODO Auto-generated method stub

LinearLayout mLinearLayout = (LinearLayout)findViewById(R.id.LinearLayout1);

mcont = new TextView(cont);

mcont.setText("万万没想到");

mLinearLayout.addView(mcont);

//mLinearLayout.setLayoutParams(new RelativeLayout.LayoutParams(-1, -1));

//TextView mView = new TextView(this);

//mView.setId(2);

//mView.setText("this is a test text!");

//RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(

// -2, -2);

// layoutParams.setMargins(100, 100, 100, 100);

//layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, -1);

//Toast.makeText(cont, "万万没想到", Toast.LENGTH_LONG).show();

//mLinearLayout.addView(mcont);

return true;

}

});

btn.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

ibtn.setImageDrawable(getResources().getDrawable(R.drawable.ic_launcher));

information.setText("您好，请输入用户名和密码");

account.setVisibility(0);

code.setVisibility(0);

account.setHint("username");

code.setHint("password");

account.setText("");

code.setText("");

}

});

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

// Handle action bar item clicks here. The action bar will

// automatically handle clicks on the Home/Up button, so long

// as you specify a parent activity in AndroidManifest.xml.

int id = item.getItemId();

if (id == R.id.action_settings) {

return true;

}

return super.onOptionsItemSelected(item);

}

/**

* A placeholder fragment containing a simple view.

*/

public static class PlaceholderFragment extends Fragment {

public PlaceholderFragment() {

}

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

View rootView = inflater.inflate(R.layout.fragment_main, container,

false);

return rootView;

}

}

}