作业七（3）

package com.example.demo01;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
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 AnotherActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_another);
        Button btn = (Button) findViewById(R.id.btn);
    }
    public void click(View view) {
        Intent intent=new Intent();
        intent.setAction("android.intent.action.VIEW");
        Uri u=Uri.parse("https://im.qq.com");
        intent.setData(u);
        startActivity(intent); 
    }



}

package com.example.demo01;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
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);
        Button btn = (Button) findViewById(R.id.btn);
    }
    private TextView textView;
    public void click(View view) {
        Intent intent = new Intent(MainActivity.this, AnotherActivity.class);
        EditText et1 = (EditText) findViewById(R.id.editText1);
        EditText et2 = (EditText) findViewById(R.id.editText2);
        textView = (TextView) findViewById(R.id.tv);
        String s1 = et1.getText().toString();
        String s2 = et2.getText().toString();
        if (s1.equals("123456") && s2.equals("abc123")) {
            startActivity(intent); 
        } else {
            Toast.makeText(MainActivity.this, "登录失败", 0).show();
        }
    }

    @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;
    }

}

<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="com.example.demo01.MainActivity" >

     <Button
        android:id="@+id/btn"
        android:layout_width="250dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="32dp"
        android:background="#3A5FCD"
        android:onClick="click"
        android:text="QQ"
        android:textSize="20sp"
        android:textColor="#FFFFFF" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="174dp"
        android:textSize="40sp"
        android:text="登录成功" />
    

</RelativeLayout>

<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="com.example.demo01.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/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/btn"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="29dp" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/editText2"
        android:layout_alignParentLeft="true"
        android:layout_marginLeft="30dp"
        android:text="账号:"
        android:textSize="20sp" />

    <Button
        android:id="@+id/btn"
        android:layout_width="250dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/editText2"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="50dp"
        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_marginTop="24dp"
        android:layout_toRightOf="@+id/textView1"
        android:ems="10"
        android:textColor="#000000"
        android:textSize="20sp" />


</RelativeLayout>

来源：https://www.cnblogs.com/shenxiaoqi/p/11728522.html