安卓第七周作业
com.example.wyp;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
Button btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn=(Button) findViewById(R.id.btn1);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(MainActivity.this,MainActivity2.class);
startActivity(i);
}
});
}
}
package com.example.wyp;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity2 extends Activity {
Button btn1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_activity2);
btn1=(Button) findViewById(R.id.btn2);
btn1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent();
i.setAction("cn.itcast.startactivity");
i.addCategory("android.intent.category.DEFAULT");
startActivity(i);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main_activity2, menu);
return true;
}
}
package com.example.wyp;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
public class MainActivity3 extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_activity3);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main_activity3, menu);
return true;
}
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
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"
tools:context=".MainActivity" >
<Button
android:id="@+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"/>
</LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
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"
tools:context=".MainActivity2" >
<Button
android:id="@+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"/>
</LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
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"
tools:context=".MainActivity3" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3"/>
</LinearLayout>
2
package com.example.wyp;
import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
Button btn;
Button btn2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn=(Button) findViewById(R.id.btn1);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(MainActivity.this,MainActivity2.class);
startActivity(i);
}
});
btn2=(Button) findViewById(R.id.btnllq);
btn2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent();
i.setAction("android.intent.action.VIEW");
i.setData(Uri.parse("http://www.baidu.com"));
startActivity(i);
}
});
}
}
package com.example.aswork1;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity3 extends AppCompatActivity {
EditText et1;
EditText et2;
Button btn1;
Button btn2;
Button btn3;
Button btn4;
TextView tv1;
String str1;
String str2;
int a;
int b;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
et1=findViewById(R.id.et1);
et2=findViewById(R.id.et2);
btn1=findViewById(R.id.btn1);
btn2=findViewById(R.id.btn2);
btn3=findViewById(R.id.btn3);
btn4=findViewById(R.id.btn4);
tv1=findViewById(R.id.tv1);
btn1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
str1=et1.getText().toString();
str2=et2.getText().toString();
a=Integer.parseInt(str1);
b=Integer.parseInt(str2);
String str3=""+(a+b);
tv1.setText(str3);
}
});
btn2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
str1=et1.getText().toString();
str2=et2.getText().toString();
a=Integer.parseInt(str1);
b=Integer.parseInt(str2);
String str3=""+(a-b);
tv1.setText(str3);
}
});
btn3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
str1=et1.getText().toString();
str2=et2.getText().toString();
a=Integer.parseInt(str1);
b=Integer.parseInt(str2);
String str3=""+(a*b);
tv1.setText(str3);
}
});
btn4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
str1=et1.getText().toString();
str2=et2.getText().toString();
a=Integer.parseInt(str1);
b=Integer.parseInt(str2);
String str3=""+(a/b);
tv1.setText(str3);
}
});
}
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/rl_1"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity3"
android:orientation="vertical">
<EditText
android:layout_width="match_parent"
android:layout_height="50dp"
android:id="@+id/et1"/>
<EditText
android:layout_width="match_parent"
android:layout_height="50dp"
android:id="@+id/et2"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn1"
android:text="加"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn2"
android:text="减"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn3"
android:text="乘"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn4"
android:text="除"/>
<TextView
android:layout_width="match_parent"
android:layout_height="100dp"
android:id="@+id/tv1"/>
</LinearLayout>
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