1、
public class MainActivity extends Activity {
private Button button;
private final static int REQUESTCODE = 1 ;
private EditText ps1,ps2,result;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) this.findViewById(R.id.button1);
ps1 = (EditText) this.findViewById(R.id.ps1);
ps2 = (EditText) this.findViewById(R.id.ps2);
result = (EditText) this.findViewById(R.id.result);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int a = Integer.parseInt(ps1.getText().toString());
int b = Integer.parseInt(ps2.getText().toString());
Intent intent = new Intent(MainActivity.this,OtherActivity.class);
startActivity(intent);
intent.putExtra("a", a);
intent.putExtra("b", b);
startActivityForResult(intent, REQUESTCODE);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == 2){//大於requestCode=1的就行
if(requestCode == 1){
int three = data.getIntExtra("three", 0);
result.setText(String.valueOf(three));
}
}
}
}
2、
public class OtherActivity extends Activity {
private Button button2;
private TextView textView;
private EditText editText;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.other);
button2 = (Button) this.findViewById(R.id.button2);
textView = (TextView) this.findViewById(R.id.msg);
editText = (EditText) this.findViewById(R.id.three);
Intent intent = getIntent();
int a = intent.getIntExtra("a", 0);
int b = intent.getIntExtra("b", 0);
textView.setText(a+" + "+b+" = ?");
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent();
int three = Integer.parseInt(editText.getText().toString());
intent.putExtra("three", three);
//通過Intent對象返回結果，setResult方法,以下兩句不可省略
setResult(2,intent);
finish();//結束當前的activity的生命週期
}
});
}
}