第七周作业
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
tools:context=".MainActivity">
<Button
android:id="@+id/bt_1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FFFFFF"
android:text="打开界面2"
android:textSize="20sp"
android:textColor="#000000"
android:layout_marginTop="20dp"
android:layout_marginLeft="10dp"/>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
tools:context=".Main2Activity">
<Button
android:id="@+id/bt_2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FFFFFF"
android:text="打开界面3"
android:textSize="20sp"
android:textColor="#000000"
android:layout_marginLeft="10dp"
android:layout_marginTop="20dp"/>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
android:background="#A5D4FA"
tools:context=".Main3Activity">
<TextView
android:id="@+id/tv_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="这是界面3"
android:textSize="40sp"
android:layout_centerInParent="true"
android:textColor="#000000"/>
</RelativeLayout>
package com.example.homework4;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn1=(Button)findViewById(R.id.bt_1);
btn1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent=new Intent(MainActivity.this,Main2Activity.class);
startActivity(intent);
}
});
}
}
package com.example.homework4;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class Main2Activity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
Button btn2=(Button)findViewById(R.id.bt_2);
btn2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent=new Intent();
intent.setAction("com.ym.second");
startActivity(intent);
}
});
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical">
<Button
android:id="@+id/bt_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="开启访问百度"
android:textSize="30dp"
android:onClick="click1" />
</LinearLayout>
package com.example.myapplication103;
import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.e("MainActivity", "调用oncreate");
}
@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
Log.e("MainActivity", "调用onstart");
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
Log.e("MainActivity", "调用onresume");
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
Log.e("MainActivity", "调用onpause");
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
Log.e("MainActivity", "调用onstop");
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
Log.e("MainActivity", "调用ondestroy");
}
@Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
Log.e("MainActivity", "调用onRestart");
}
public void click1(View view){
Intent intent=new Intent();
intent.setAction("android.intent.action.VIEW");
intent.setData(Uri.parse("http://www.baidu.com"));
startActivity(intent);
}
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
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=".Main2Activity"
android:layout_margin="20dp">
<TextView
android:id="@+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="数字:"
android:textColor="#000000"
android:textSize="20sp"
android:layout_marginTop="15dp"/>
<EditText
android:id="@+id/et1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入数字"
android:textSize="25sp"
android:textColorHint="#E91313"
android:maxLines="1"
android:scrollHorizontally="true"
android:layout_toRightOf="@+id/tv1"/>
<TextView
android:id="@+id/tv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="数字:"
android:textColor="#000000"
android:textSize="20sp"
android:layout_marginTop="25dp"
android:layout_below="@id/tv1"/>
<EditText
android:id="@+id/et2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入数字"
android:textSize="25sp"
android:textColorHint="#E91313"
android:maxLines="1"
android:scrollHorizontally="true"
android:layout_toRightOf="@+id/tv1"
android:layout_below="@id/et1"/>
<Button
android:id="@+id/btn_1"
android:layout_width="100dp"
android:layout_height="100dp"
android:text="+"
android:textColor="#000000"
android:textSize="50sp"
android:layout_below="@id/et2"
android:layout_marginTop="100dp"
android:layout_margin="10dp"
android:layout_alignLeft="@id/et2" />
<Button
android:id="@+id/btn_2"
android:layout_width="100dp"
android:layout_height="100dp"
android:text="-"
android:textColor="#000000"
android:textSize="50sp"
android:layout_below="@id/et2"
android:layout_toRightOf="@id/btn_1" />
<Button
android:id="@+id/btn_3"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_below="@id/btn_1"
android:layout_margin="10dp"
android:text="*"
android:textColor="#000000"
android:textSize="50sp"
android:layout_alignLeft="@id/et2" />
<Button
android:id="@+id/btn_4"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_below="@id/btn_1"
android:layout_toRightOf="@id/btn_3"
android:text="/"
android:textColor="#000000"
android:textSize="50sp"
android:layout_alignTop="@id/btn_3" />
<TextView
android:id="@+id/tv3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/btn_3"
android:layout_margin="20dp"
android:text="结果是："
android:textSize="45sp"
android:textColor="#000000"
android:textStyle="italic"/>
</RelativeLayout>
package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class Main2Activity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
//+
findViewById(R.id.btn_1).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String num1=((EditText)(findViewById(R.id.et1))).getText().toString();
String num2=((EditText)(findViewById(R.id.et2))).getText().toString();
int n1=Integer.parseInt(num1);
int n2=Integer.parseInt(num2);
int n3=n1+n2;
TextView tv1=(TextView)findViewById(R.id.tv3);
tv1.setText("结果是"+n3);
}
});
//-
findViewById(R.id.btn_2).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String num1=((EditText)(findViewById(R.id.et1))).getText().toString();
String num2=((EditText)(findViewById(R.id.et2))).getText().toString();
int n1=Integer.parseInt(num1);
int n2=Integer.parseInt(num2);
int n3=n1-n2;
TextView tv1=(TextView)findViewById(R.id.tv3);
tv1.setText("结果是"+n3);
}
});
//*
findViewById(R.id.btn_3).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String num1=((EditText)(findViewById(R.id.et1))).getText().toString();
String num2=((EditText)(findViewById(R.id.et2))).getText().toString();
int n1=Integer.parseInt(num1);
int n2=Integer.parseInt(num2);
int n3=n1*n2;
TextView tv1=(TextView)findViewById(R.id.tv3);
tv1.setText("结果是"+n3);
}
});
//除
findViewById(R.id.btn_4).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String num1=((EditText)(findViewById(R.id.et1))).getText().toString();
String num2=((EditText)(findViewById(R.id.et2))).getText().toString();
int n1=Integer.parseInt(num1);
int n2=Integer.parseInt(num2);
int n3=n1/n2;
TextView tv1=(TextView)findViewById(R.id.tv3);
tv1.setText("结果是"+n3);
}
});
}
}
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