第7周作业
第七周作业
第一题
1.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="20dp"
android:orientation="vertical">
<Button
android:id="@+id/interface2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="显示意图 --> 界面二" />
<Button
android:id="@+id/interface3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="隐式意图 --> 界面三" />
</LinearLayout>
2.<?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=".Second_Activity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="30dp"
android:text="Second_interface"
android:textSize="40sp"
android:textStyle="bold" />
<Button
android:id="@+id/interface2_3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="隐式意图 --> 界面三" />
</LinearLayout>
3.<?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=".Third_Activity"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Third_interface"
android:textSize="40sp"
android:textStyle="bold"
android:layout_margin="30dp"/>
</LinearLayout>
4.package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Object Second_Activity;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.interface2).setOnClickListener(this);
findViewById(R.id.interface3).setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.interface2:
Intent intent1 = new Intent(MainActivity.this,Second_Activity.class);
startActivity(intent1);
break;
case R.id.interface3:
Intent intent2 = new Intent();
intent2.setAction("com.example.START_ACTIVITY");
startActivity(intent2);
break;
}
}
}
5.package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
public class Second_Activity extends AppCompatActivity implements View.OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second_);
findViewById(R.id.interface2_3).setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.interface2_3:
Intent intent2_3 = new Intent();
intent2_3.setAction("com.example.START_ACTIVITY");
startActivity(intent2_3);
break;
}
}
}
6.<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapplication">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".Third_Activity">
<intent-filter>
<action android:name="com.example.START_ACTIVITY" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity android:name=".Second_Activity" />
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
第二题
1.<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="20dp"
android:orientation="vertical">
<Button
android:id="@+id/interface2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="显示意图 --> 界面二" />
<Button
android:id="@+id/interface3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="隐式意图 --> 界面三" />
<Button
android:id="@+id/OpenBrowser"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="OpenBrowser --> baidu.com"/>
</LinearLayout>
2.
package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Object Second_Activity;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.interface2).setOnClickListener(this);
findViewById(R.id.interface3).setOnClickListener(this);
findViewById(R.id.OpenBrowser).setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.interface2:
Intent intent1 = new Intent(MainActivity.this,Second_Activity.class);
startActivity(intent1);
break;
case R.id.interface3:
Intent intent2 = new Intent();
intent2.setAction("com.example.START_ACTIVITY");
startActivity(intent2);
break;
case R.id.OpenBrowser:
Intent intent3 = new Intent();
// 设置开启系统浏览器动作
intent3.setAction("android.intent.action.VIEW");
// 设置要打开的网页
intent3.setData(Uri.parse("http://baidu.com"));
startActivity(intent3);
break;
}
}
}
第三题
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="20dp"
android:orientation="vertical">
<EditText
android:id="@+id/et1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="10dp"
android:gravity="center"
android:maxLines="1"
android:textSize="50sp"
android:phoneNumber="true"
android:scrollHorizontally="false" />
<TextView
android:id="@+id/tv_1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textColor="#FF0000"
android:textSize="30sp"
android:text="运算符"/>
<EditText
android:id="@+id/et2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="10dp"
android:gravity="center"
android:maxLines="1"
android:textSize="50sp"
android:phoneNumber="true"
android:scrollHorizontally="false" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/sum"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="加(+)" />
<Button
android:id="@+id/minus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="减(-)" />
<Button
android:id="@+id/product"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="乘(*)" />
<Button
android:id="@+id/divide"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="除(/)" />
</LinearLayout>
<TextView
android:id="@+id/tv_2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="60sp"
android:textColor="#0000FF"
/>
</LinearLayout>
package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Object Second_Activity;
private EditText et1,et2;
private TextView tv1,tv2;
private String textx;
private float num;
private Button sum,minus,product,divide;
private Toast toast;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et1 = (EditText)findViewById(R.id.et1);
tv1 = findViewById(R.id.tv_1);
tv2 = findViewById(R.id.tv_2);
sum = findViewById(R.id.sum);
sum.setOnClickListener(this);
minus = findViewById(R.id.minus);
minus.setOnClickListener(this);
product = findViewById(R.id.product);
product.setOnClickListener(this);
divide = findViewById(R.id.divide);
divide.setOnClickListener(this);
}
@Override
public void onClick(View view) {
et2 = (EditText)findViewById(R.id.et2);
float num1 = Integer.parseInt(et1.getText().toString());
float num2 = Integer.parseInt(et2.getText().toString());
switch (view.getId()){
case R.id.sum:
num = num1 +num2;
tv1.setText("加（+）");
break;
case R.id.minus:
num = num1 -num2;
tv1.setText("减（-）");
break;
case R.id.product:
num = num1 *num2;
tv1.setText("乘（*）");
break;
case R.id.divide:
num = (float)(num1*1.0 /num2);
tv1.setText("除（/）");
if (num2 == 0){
Toast.makeText(this,"错误",Toast.LENGTH_LONG).show();
}
break;
}
textx = String.valueOf(num);
tv2.setText(textx);
}
}
