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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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