013_01Activity的几种简单用法

1.传递参数
    传值：
    Intent intent=new Intent();
    intent.putExtra("extra", "这是页面一传来的值！");
    intent.setClass(Test_for_intentActivity.this, actpage2.class);
    startActivity(intent);
    取值：
    Intent intent=getIntent();
    String StringE=intent.getStringExtra("extra");
    TextView text2=(TextView)findViewById(R.id.textView2);
    text2.setText(StringE);

2.打开网页
    Uri uri = Uri.parse("http://www.google.com");
    Intent it  = new Intent(Intent.ACTION_VIEW,uri);
    startActivity(it); 

3.拨打电话
    Uri uri =Uri.parse("tel:xxxxxx");
    Intent it = new Intent(Intent.ACTION_DIAL,uri);  
    startActivity(it);
     
4.调用发短信的程序
    Intent it = newIntent(Intent.ACTION_VIEW);   
    it.putExtra("sms_body", "TheSMS text");   
    it.setType("vnd.android-dir/mms-sms");   
    startActivity(it);

5.发送附件
    Intent it = new Intent(Intent.ACTION_SEND);  
    it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");  
    it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/eoe.mp3");