Android的Activity跳转和传值

//需要返回值:
Intent intent = new Intent(MyAndroidAppActivity.this, SendSMSActivity.class);
startActivityForResult(intent, SEND_SMS_REQUEST);

//不需要返回值:
startActivity(new Intent (MyAndroidAppActivity.this, Notepadv1.class) );

// 1
Intent intent = new Intent(this, TextInputActivity.class);
intent.putExtra("Text", mText);
intent.putExtra("TextColor", mTextColor);
intent.putExtra("TextSize", mTextSize);
intent.putExtra("TextBold", mTextBold);
// 2
Bundle extras = getIntent().getExtras();
mText = extras.getString("Text");
mTextColor = extras.getInt("TextColor");
mTextSize = extras.getFloat("TextSize");
mTextBold = extras.getBoolean("TextBold");