http://blog.sina.com.cn/s/blog_83940dfb0100veas.html
用于Activity之间的数据传递
在起始Activity中,发送数据
protected void onCreate(Bundle saveInstanceState){
super.onCreate(saveInstanceState);
setContentView(R.layout.thisactivity);
Intent intent = new Intent();
//设置起始Activity和目标Activity,表示数据从这个Activity传到下个Activity
intent.setClass(ThisActivity.this,TargetActivity.class);
//绑定数据
intent.putExtra("username",username);//也可以绑定数组
intent.putExtra("userpass",userpass);
//打开目标Activity
startActivity(intent);
}
在目标Activity中,接收数据:
protected void onCreate(Bundle saveInstanceState){
super.onCreate(saveInstanceState);
setContentView(R.layout.targetactivity);
//获得意图
Intent intent = getIntent();
//读取数据
String name = intent.getStringExtra("username");
String pass = intent.getStringExtra("userpass);
}
也可以适用Bundle(捆)
在起始Activity中,发送数据:
protected void onCreate(Bundle saveInstanceState){
super.onCreate(saveInstanceState);
setContentView(R.layout.thisactivity);
Intent intent = new Intent();
//设置起始Activity和目标Activity,表示数据从这个Activity传到下个Activity
intent.setClass(ThisActivity.this,TargetActivity.class);
//一次绑定多个数据
Bundle bundle = new Bundle();
bundle.putString("username",username);
bundle.putString("userpass",userpass);
intent.putExtras(bundle);
//打开目标Activity
startActivity(intent);
}
在目标Activity中,接收数据:
protected void onCreate(Bundle saveInstanceState){
super.onCreate(saveInstanceState);
setContentView(R.layout.targetactivity);
//获得意图
Intent intent = getIntent();
//读取数据
Bundle bundle = intent.getExtras();
String name = bundle.getString("username");
String pass = bundle.getString("userpass");
}
当需要从目标Activity回传数据到原Activity时,可以使用上述方法定义一个新的Intent来传递数据,也可以使用startActivityForResult(Intent intent, int requestCode);方法。
在起始Activity中,发送数据:
protected void onCreate(Bundle saveInstanceState){
super.onCreate(saveInstanceState);
setContentView(R.layout.thisactivity);
Intent intent = new Intent();
//设置起始Activity和目标Activity,表示数据从这个Activity传到下个Activity
intent.setClass(ThisActivity.this,TargetActivity.class);
//绑定数据
intent.putExtra("username",username);//也可以绑定数组
intent.putExtra("userpass",userpass);
//打开目标Activity
startActivityForResult(intent,1);
}
//需要重写onActivityResult方法
protected void onActivityResult(int requestCode, int resultCode, Intent intent){
super.onActivityResult(requestCode,resultCode,intent);
//判断结果码是否与回传的结果码相同
if(resultCode == 1){
//获取回传数据
String name = intent.getStringExtra("name");
String pass = intent.getStringExtra("pass);
//对数据进行操作
......
}
在目标Activity中,接收数据:
protected void onCreate(Bundle saveInstanceState){
super.onCreate(saveInstanceState);
setContentView(R.layout.targetactivity);
//获得意图
Intent intent = getIntent();
//读取数据
String name = intent.getStringExtra("username");
String pass = intent.getStringExtra("userpass);
//从EditText中获取新的数据给name和pass
name = editText1.getText().toString();
pass = editText2.getText().toString()
//数据发生改变,需要把改变后的值传递回原来的Activity
intent.putExtra("name",name);
intent.putExtra("pass",pass);
//setResult(int resultCode,Intent intent)方法
setResult(1,intent);
//销毁此Activity,摧毁此Activity后将自动回到上一个Activity
finish();
}