多Activity应用

第一个界面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_liyuan"
    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"
    android:orientation="vertical"
    >
    <EditText
        android:id="@+id/shuru"
        android:layout_marginTop="180dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:hint="请输入姓名"></EditText>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
            <Button
                android:id="@+id/in"
                android:onClick="onClick"
                android:layout_weight="1"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="20dp"
                android:text="进入评估"
                />
            <Button
                android:id="@+id/out"
                android:onClick="onClick"
                android:layout_weight="1"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="20dp"
                android:text="退出" />
        </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/tv1"/>
        </LinearLayout>
    </LinearLayout>
</LinearLayout>

第二个界面相应代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_gou"
    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"
    android:gravity="center"
    android:orientation="vertical"
    tools:context="lenovo_com.liyuan.GouActivity">

    <TextView
            android:id="@+id/question"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:hint="gou同学：学习安卓有没有信心"
            android:textSize="20sp"
            android:gravity="center"
            android:layout_marginTop="10dp"/>
    <EditText
        android:id="@+id/shuru2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text=" "/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <Button
            android:onClick="onClick"
            android:id="@+id/no"
            android:layout_marginTop="20dp"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="没有"
            android:layout_weight="1"/>
        <Button
            android:onClick="onClick"
            android:id="@+id/yes"
            android:layout_marginTop="20dp"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="有"
            android:layout_weight="1"/>




</LinearLayout>
    </LinearLayout>

对其功能的实现一

package lenovo_com.liyuan;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;



public class LiyuanActivity extends AppCompatActivity {
    private EditText shuru;
    private Button btn;
    private Button in;
    private Button out;
    private TextView tv1;


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

        shuru= (EditText) findViewById(R.id.shuru);

        tv1 = (TextView)

                findViewById(R.id.tv1);

        Intent intent=getIntent();

        tv1.setText(intent.getStringExtra("data"));

    } public void onClick(View view) {

        String name = shuru.getText().toString();

    }
}
二

package lenovo_com.liyuan;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import static android.R.attr.y;
import static lenovo_com.liyuan.R.id.no;
import static lenovo_com.liyuan.R.id.shuru2;

public class GouActivity extends AppCompatActivity {
    private EditText shuru2;
    private Button no;
    private Button yes;
    private TextView question;

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_gou);

        question = (TextView) findViewById(R.id.question);

        Intent intent = getIntent();

        String name = intent.getStringExtra("name");

        question.setText(name + ":" + "对学习java有没有信心？");

    }

    public void onClick(View view){ switch (view.getId()

            )

    {

        case R.id.yes: y();

            break; case R.id.no: n(); break;

    }

    }

    public void y()

    {

        Intent intent = new Intent(GouActivity.this,GouActivity.class);

        String yes = y.getext().toString();

        intent.putExtra("result","对学习java有信心");

        startActivity(intent);

        finish();

    }

    public void n()

    {

        Intent intent = new Intent(GouActivity.this,GouActivity.class);

        String no= no.getText().toString();

        intent.putExtra("question","对学习java没有信心");

        startActivity(intent);

        finish();

    }

}
第二个Java语句不管怎么改还是有错。。。