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页面跳转作业

下面就是两个布局的代码,和相应的java代码。做的时候遇到一点问题就是跳转时会闪退,发现是manifests注册有点问题,两个页面的跳转这个很关键。

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第一个xml
<?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_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.administrator.myapplication.MainActivity">

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:hint="请输入姓名"
        android:textSize="20sp"
        android:id="@+id/xm_text"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="166dp"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <Button
            android:layout_width="20dp"
            android:layout_height="50dp"
            android:layout_weight="1"
            android:text="进入评估"
            android:textSize="25sp"
            android:background="#469"
            android:id="@+id/bt_pg"
            android:onClick="onClick"/>

        <Button
            android:layout_weight="1"
            android:layout_width="20dp"
            android:layout_height="50dp"
            android:text="退出"
            android:textSize="25sp"
            android:background="#469"
            android:id="@+id/bt_tc"
            android:onClick="Exit"/>
    </LinearLayout>


    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/yf_tv"
        android:textColor="@android:color/black"
        android:layout_margin="30sp"
        android:layout_weight="0.42" />

</LinearLayout>
第二个xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:weightSum="1">


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=""
        android:textSize="25sp"
        android:textColor="#000000"
        android:id="@+id/yf_text2"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="166dp"/>


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="25sp"
        android:textColor="#000000"
        android:id="@+id/yf_text1"
        />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">


        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="有"
            android:textSize="25sp"
            android:id="@+id/bt_yes"
            android:onClick="onClick"/>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="25sp"
            android:text="没有"
            android:id="@+id/bt_no"
            android:onClick="onClick"/>
    </LinearLayout>

</LinearLayout>
第一个xml的java
package com.example.administrator.myapplication;

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

public class MainActivity extends AppCompatActivity {

    private EditText xm_text;
    private Button bt_pg,bt_tc;
    private TextView yftv;

 

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


        xm_text=(EditText)findViewById(R.id.xm_text);
        bt_pg=(Button)findViewById(R.id.bt_pg);
        bt_tc=(Button)findViewById(R.id.bt_tc);

        String data="";
        Intent intent=getIntent();
        String jg=intent.getStringExtra("result");
        TextView yftv=(TextView)findViewById(R.id.yf_tv);
        data = http://www.mamicode.com/jg;
        yftv.setText(data);

 

    }

    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.bt_pg:
                PG();
            case R.id.xm_text:
            case R.id.bt_tc:
                finish();
                break;
        }
    }

 

 

    private void PG() {
        Intent intent = new Intent(MainActivity.this, Main.class);
        String text =xm_text.getText().toString();
        intent.putExtra("name",text+"同学:对学习安卓有没有信心?");
        startActivity(intent);
    }


}
第二个xml的java
package com.example.administrator.myapplication;

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

public class MainActivity extends AppCompatActivity {

    private EditText xm_text;
    private Button bt_pg,bt_tc;
    private TextView yftv;

 

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


        xm_text=(EditText)findViewById(R.id.xm_text);
        bt_pg=(Button)findViewById(R.id.bt_pg);
        bt_tc=(Button)findViewById(R.id.bt_tc);

        String data="";
        Intent intent=getIntent();
        String jg=intent.getStringExtra("result");
        TextView yftv=(TextView)findViewById(R.id.yf_tv);
        data = http://www.mamicode.com/jg;
        yftv.setText(data);

 

    }

    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.bt_pg:
                PG();
            case R.id.xm_text:
            case R.id.bt_tc:
                finish();
                break;
        }
    }

 

 

    private void PG() {
        Intent intent = new Intent(MainActivity.this, Main.class);
        String text =xm_text.getText().toString();
        intent.putExtra("name",text+"同学:对学习安卓有没有信心?");
        startActivity(intent);
    }


}

页面跳转作业