第三次作业

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
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=".MainActivity" >

<ImageView
android:id="@+id/picture"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_centerHorizontal="true"
android:layout_marginTop="58dp"
android:src="@drawable/picture" />

<EditText
android:id="@+id/editText2"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText1"
android:layout_below="@+id/editText1"
android:layout_marginTop="19dp"
android:ems="10" />

<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/editText2"
android:layout_alignBottom="@+id/editText2"
android:layout_alignLeft="@+id/textView1"
android:text="密码:"
android:textSize="20sp" />

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/editText1"
android:layout_alignLeft="@+id/btn"
android:text="账号:"
android:textSize="20sp" />

<Button
android:id="@+id/btn"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@+id/editText2"
android:layout_marginTop="43dp"
android:background="#3A5FCD"
android:onClick="click"
android:text="登录"
android:textColor="#FFFFFF" />

<EditText
android:id="@+id/editText1"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_below="@+id/picture"
android:layout_marginLeft="24dp"
android:layout_marginTop="22dp"
android:layout_toRightOf="@+id/textView1"
android:ems="10"
android:textColor="#000000"
android:textSize="20sp" >

<requestFocus />
</EditText>

<TextView
android:id="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/btn"
android:layout_centerHorizontal="true"
android:layout_marginTop="29dp"
android: />

</RelativeLayout>

package com.example.qq;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

}

private TextView textView;

public void click(View view) {
Button btn = (Button) findViewById(R.id.btn);
EditText et1 = (EditText) findViewById(R.id.editText1);
EditText et2 = (EditText) findViewById(R.id.editText2);
textView = (TextView) findViewById(R.id.tv);
switch (view.getId()) {
case R.id.btn:

String s1 = et1.getText().toString();
String s2 = et2.getText().toString();
if (s1.equals("123456") && s2.equals("abc123")) {
Toast.makeText(MainActivity.this, "登录成功", 0).show(); // 点击按钮时，在下面弹出消息框
} else {
textView.setText("登录失败");
}
}
}

@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;
}

}