startActivityForResult

startActivityForResult  的利用

1.  跳转新的Activity方法
     public void bt1(View view){
        Toast.makeText(this, "bu1", Toast.LENGTH_SHORT).show();
        Intent intent = new Intent(this, v2.class);
        startActivityForResult(intent, 99);
    }

2.  回调方法
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        String ss = data.getStringExtra("a").toString();
        ((EditText) findViewById(R.id.editText1)).setText(ss);
        String b = data.getStringExtra("b").toString();
        String c = data.getStringExtra("c").toString();
        Toast.makeText(this, b, Toast.LENGTH_SHORT).show();
        this.setTitle(c);
    }

3.  从新的Activity返回值的的方法
    public void bu2(View view){
        EditText et = (EditText) findViewById(R.id.editText);
        Intent intent = new Intent();
        intent.putExtra("a", et.getText().toString());
        intent.putExtra("b", "bbbbbb");
        intent.putExtra("c", "cccccc");
        setResult(88,intent);
        this.finish();
    }