Activity初级：startActivityForResult、重写onActivityResult、setResult回传数据、requestCode请求码-阿里云开发者社区

Activity初级：startActivityForResult、重写onActivityResult、setResult回传数据、requestCode请求码

2017-11-15 1093

简介：

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main端：

/**

 * 实现：主页面点击按钮1，跳转到页面二输入内容，点击页面二按钮返回主页面并显示输入信息；

 *     主页面点击按钮2，跳转到页面三输入内容，点击页面三按钮返回主页面并显示输入信息.

 * 主要步骤：

 * 1) startActivityForResult(intent, 0);

 * 2) 回传数据时，调用setResult(0, data)方法，然后执行finish()

 * 3) onActivityResult(int, int, Intent data)

 */

public class MainActivity extends Activity
{

    private static final int BTN_ONE = 1;//将常量封装定义

    private static final int BTN_TWO = 2;

    @Override//重写onActivityResult

    protected void onActivityResult(int requestCode, int resultCode, Intent data)

    {

        super.onActivityResult(requestCode, resultCode, data);//有参数的super必须重写

        TextView textView = (TextView) findViewById(R.id.textView1_main);

        if(requestCode == BTN_ONE)//根据请求码判断接收内容

        {

            String str = data.getStringExtra("one");

            textView.setText(str);

        }

        else if(requestCode == BTN_TWO)

        {

            String str = data.getStringExtra("two");

            textView.setText(str);

        }

    }

    @Override

    protected void onCreate(Bundle savedInstanceState)

    {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        //监听button1，跳转到NextActivity，等待result

        Button button1=(Button) findViewById(R.id.button1_main);

        button1.setOnClickListener(new OnClickListener()

        {

            @Override

            public void onClick(View v)

            {

                Intent intent = new Intent(MainActivity.this,NextActivity.class);

                startActivityForResult(intent, BTN_ONE);

            }

        });

        //监听button2，跳转到ThirdActivity，等待result

        Button button2 =(Button) findViewById(R.id.button2_main);

        button2.setOnClickListener(new OnClickListener()

        {

            @Override

            public void onClick(View v)

            {

               Intent intent = new Intent(MainActivity.this,ThirdActivity.class);

               startActivityForResult(intent, BTN_TWO);

            }

        });

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu)

    {

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }
}

next端：

public class NextActivity extends Activity
{

    @Override

    protected void onCreate(Bundle savedInstanceState)

    {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_next);

        Button button =(Button) findViewById(R.id.button1_next);

        button.setOnClickListener(new OnClickListener()

        {

            @Override

            public void onClick(View v)

            {

                //得到用户数据

                EditText editText=(EditText) findViewById(R.id.editText1_next);

                String strone = editText.getText().toString();

                //回传数据

                Intent data = new Intent();

                data.putExtra("one", strone);

                setResult(1, data );

                //关闭当前窗口

                finish();

            }

        });

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu)

    {

        getMenuInflater().inflate(R.menu.next, menu);

        return true;

    }
}

third端：

public class ThirdActivity extends Activity
{

    @Override

    protected void onCreate(Bundle savedInstanceState)

    {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_third);

        Button button = (Button) findViewById(R.id.button1_third);

        button.setOnClickListener(new OnClickListener()

        {

            @Override

            public void onClick(View v)

            {

                EditText editText = (EditText) findViewById(R.id.editText1_third);

                String strtwo = editText.getText().toString();

                Intent data = new Intent();

                data.putExtra("two", strtwo);

                setResult(2,data );

                finish();

            }

        });

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu)

    {

        getMenuInflater().inflate(R.menu.third, menu);

        return true;

    }
}

本文转自 glblong 51CTO博客，原文链接：http://blog.51cto.com/glblong/1195845，如需转载请自行联系原作者