Android实现乘法小例子（两个Activity）

主Activity------->AddActivity

package android.proper;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class AddActivity extends Activity {
/** Called when the activity is first created. */
private EditText et1=null;
private EditText et2=null;
private TextView tv1=null;
private Button but1=null;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
et1=(EditText)findViewById(R.id.et1);
et2=(EditText)findViewById(R.id.et2);
tv1=(TextView)findViewById(R.id.tv1);
but1=(Button)findViewById(R.id.but1);
//tv1.setText("加");
//but1.setText("计算");
tv1.setText(R.string.cheng);
but1.setText(R.string.jisuan);
but1.setOnClickListener(new AddListener());
}

class AddListener implements OnClickListener
{

public void onClick(View v) {
// TODO Auto-generated method stub
//取得两个EditText的值
//存到intent对象之中
//使用intent对象启动Activity
String et1str=et1.getText().toString();
String et2str=et2.getText().toString();
Intent intent=new Intent();
intent.putExtra("et1", et1str);
intent.putExtra("et2", et2str);
intent.setClass(AddActivity.this, ResultActivity.class);
AddActivity.this.startActivity(intent);
}

}
}

显示结果Activity------->ResultActivity

package android.proper;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class ResultActivity extends Activity{
private TextView tv1=null;
protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.result);
Intent intent=getIntent();
String et1=intent.getStringExtra("et1");
String et2=intent.getStringExtra("et2");
tv1=(TextView)findViewById(R.id.tv3);
int intet1=Integer.parseInt(et1);
int intet2=Integer.parseInt(et2);
int result=intet1*intet2;
System.out.print(result);
tv1.setText(result+"");

}

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