Activity之间的跳转及数据传输

两个activity之间的跳转和传输数据以及返回数据

A跳转到B并等待B传回数据

public class MainActivity extends AppCompatActivity {
    public final static int REQUEST_CODE = 1;
    private Button jump_btn;
    private TextView jump_tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }

    private void initView() {
        jump_btn = findViewById(R.id.btn_jump);
        jump_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                jump();
            }
        });
        jump_tv = findViewById(R.id.tv_jump);
    }

    private void jump() {
        Intent intent = new Intent(MainActivity.this,Activity_2.class);
        intent.putExtra("news","你好，我是地球程序员");
        startActivityForResult(intent,REQUEST_CODE);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == REQUEST_CODE && resultCode == Activity_2.RESULT_CODE){
            jump_tv.setText(data.getStringExtra("name"));
        }
    }
}

B接受数据并返回值

public class Activity_2 extends AppCompatActivity {
    public final static int RESULT_CODE = 1;
    private Button jump_btn;
    private TextView tv_accept;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_2);
        initView();
    }

    private void initView() {
        jump_btn = (Button) findViewById(R.id.btn_jump);
        tv_accept = (TextView) findViewById(R.id.tv_accept);
        jump_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                jump();
            }
        });
        accept();
    }

    private void accept() {
        Intent intent = getIntent();
        String str_accept = intent.getStringExtra("news");
        tv_accept.setText(str_accept);

    }

    private void jump() {
        Intent intent = new Intent();
        intent.putExtra("name","来自异次元的消息");
        setResult(RESULT_CODE,intent);
        finish();//不要忘了finish（）；
    }
}

Activity之间的跳转及数据传输

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