android用Intent实现Activity跳转

package com.example.intenttest;

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

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btn1=(Button)findViewById(R.id.b1);
btn1.setOnClickListener(new Button.OnClickListener()
{
public void onClick(View view)
{
Intent intent=new Intent();
intent.setClass(MainActivity.this,Test.class);
startActivity(intent);
MainActivity.this.finish();
}
});
}

@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, menu);
return true;
}

}

package com.example.intenttest;

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

public class Test extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test);
Button btn2=(Button)findViewById(R.id.b2);
btn2.setOnClickListener(new Button.OnClickListener()
{
public void onClick(View view)
{
Intent intent=new Intent();
intent.setClass(Test.this,MainActivity.class);
startActivity(intent);
Test.this.finish();
}
});
}
@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, menu);
return true;
}

}