Intent传递数据并跳转页面
4.9作业登陆app
要求:
1、实现Intent调整和传递数据的功能。
2、在MainAcitvity界面输入账号和密码信息,传递到DetailActivity界面显示。
步骤:
1、新建DetialActivity.java
在Android目录结构下右键点击app文件夹依次选择New->Activity->Empty Activity
Activity Name填写项目名称,Layout Name会自动生成,注意Source Language是Java。
2、项目代码
MainAcitvity.java
package com.example.helloandroid1;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
EditText edUserName,edPassWord;
Button btnLogin;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edUserName = findViewById(R.id.edUserName);
edPassWord = findViewById(R.id.edPassWord);
btnLogin = findViewById(R.id.btnLogin);
btnLogin.setOnClickListener(new View.OnClickListener() {//绑定点击事件,用intent携带数据并跳转的方式
@Override
public void onClick(View v) {
String userName = edUserName.getText().toString();//EditText输入的数据
String passWord = edPassWord.getText().toString();
Intent intent = new Intent(MainActivity.this,DetialActivity.class);//初始化intent并设置打开的页面
intent.putExtra("userName",userName);//设置绑定数据
intent.putExtra("passWord",passWord);
startActivity(intent);//启动页面
}
});
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<EditText
android:id="@+id/edUserName"
android:layout_width="200dp"
android:layout_height="48dp"
android:layout_marginTop="64dp"
android:hint="用户名"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.497"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/edPassWord"
android:layout_width="200dp"
android:layout_height="48dp"
android:layout_marginTop="28dp"
android:hint="密码"
app:layout_constraintEnd_toEndOf="@+id/edUserName"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="@+id/edUserName"
app:layout_constraintTop_toBottomOf="@+id/edUserName" />
<Button
android:id="@+id/btnLogin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="28dp"
android:text="登录"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/edPassWord" />
</androidx.constraintlayout.widget.ConstraintLayout>
DetialActivity.java
package com.example.helloandroid1;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class DetialActivity extends AppCompatActivity {
TextView tvUserName,tvPassWord;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detial);
tvUserName = findViewById(R.id.tvUserName);
tvPassWord = findViewById(R.id.tvPassWord);
//获取intent数据
Intent intent = getIntent();
String un = intent.getStringExtra("userName");
String pw = intent.getStringExtra("passWord");
//TextView显示数据
tvUserName.setText(un);
tvPassWord.setText(pw);
}
}
avtivity_detial. xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".DetialActivity">
<TextView
android:id="@+id/tvPassWord"
android:layout_width="150dp"
android:layout_height="30dp"
android:layout_marginTop="40dp"
android:textSize="20sp"
app:layout_constraintEnd_toEndOf="@+id/tvUserName"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="@+id/tvUserName"
app:layout_constraintTop_toBottomOf="@+id/tvUserName" />
<TextView
android:id="@+id/tvUserName"
android:layout_width="150dp"
android:layout_height="30dp"
android:layout_marginTop="64dp"
android:textSize="20sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.67"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textView6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="用户名"
android:textSize="20sp"
app:layout_constraintBottom_toBottomOf="@+id/tvUserName"
app:layout_constraintEnd_toStartOf="@+id/tvUserName"
app:layout_constraintHorizontal_bias="0.609"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/tvUserName"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="@+id/textView7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="48dp"
android:text="密码"
android:textSize="20sp"
app:layout_constraintBottom_toBottomOf="@+id/tvPassWord"
app:layout_constraintEnd_toStartOf="@+id/tvPassWord"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="@+id/textView6"
app:layout_constraintTop_toTopOf="@+id/tvPassWord"
app:layout_constraintVertical_bias="1.0" />
</androidx.constraintlayout.widget.ConstraintLayout>