Android中Acvitity的（startActivityForResult）传值方式

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mainacvitity.xml    <Button        android:id="@+id/btn_press"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Hello World!" />

secacvitity.xml  <EditText        android:id="@+id/et_text"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:hint="请输入设置内容"        android:textSize="25sp"/>    <Button        android:id="@+id/btn_desgin"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="设置"        android:textSize="25sp"/>

MainAcvitity.Javapublic class MainActivity extends AppCompatActivity {    private Button btn_press;    public int request_nickname=1;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        btn_press= (Button) findViewById(R.id.btn_press);        btn_press.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent=new Intent(MainActivity.this,SecActivity.class);                startActivityForResult(intent,request_nickname);            }        });    }    /**     * 重写onAcvitityRusult()方法     * @param requestCode 请求码     * @param resultCode    结果码     * @param data 传过来的数据     */    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        //首先判断请求码 然后判断结果码        if(requestCode!=request_nickname){//说明是设置的不是昵称            return;        }        if(resultCode==RESULT_OK){//说明用户输入了            btn_press.setText(data.getStringExtra("text"));        }else if(resultCode==RESULT_CANCELED){            Toast.makeText(MainActivity.this,"用户取消",Toast.LENGTH_SHORT).show();        }        super.onActivityResult(requestCode, resultCode, data);    }

SecAcvitity.java

public class SecActivity extends AppCompatActivity {    private EditText et_text;    private Button btn_desgin;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_sec);        et_text= (EditText) findViewById(R.id.et_text);        btn_desgin= (Button) findViewById(R.id.btn_desgin);        btn_desgin.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                String name=et_text.getText().toString();                if(TextUtils.isEmpty(name)){//用户没有输入，结果码是取消                        setResult(RESULT_CANCELED);                }else {//如果输入不为空，执行带值跳转                    Intent intent=new Intent();                    intent.putExtra("text",name);                    setResult(RESULT_OK,intent);                }                SecActivity.this.finish();//结束当前页面，返回要跳转的页面AcvitityMain            }

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