先記下要點(diǎn)

跳轉(zhuǎn)

    button1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(FirstActivity.this,SecondActivity.class);
            startActivity(intent);
        }
    });

傳遞數(shù)據(jù)

firstactivity發(fā)送數(shù)據(jù)

    button1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(FirstActivity.this,SecondActivity.class);
            String data = "hello second";
            intent.putExtra("extra_data", data);
            startActivity(intent);
        }
    });

secondactivity接收數(shù)據(jù)

    Intent intent = getIntent();
    String data = intent.getStringExtra("extra_data");

返回?cái)?shù)據(jù)

跳轉(zhuǎn)前的代碼

    button1.setOnClickListener(new View.OnClickListener() {
        @Override
//重寫 onActivityResult
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
        case 1:
            if (resultCode == RESULT_OK) {
                String returnedData = data.getStringExtra("data_return");
                Log.d("FirstActivity", returnedData);
            }
            break;
        default:
    }
}
        public void onClick(View v) {
            Intent intent = new Intent(FirstActivity.this,SecondActivity.class);
            String data = "hello second";
            intent.putExtra("extra_data", data);
            //startActivity(intent);
          startActivityForResult(intent, 1);
        }
    });

    Intent intent = getIntent();
    String data = intent.getStringExtra("extra_data");

跳轉(zhuǎn)的代碼

@Override
public void onBackPressed(){
    Intent intent = new Intent();
    intent.putExtra("data_return","hello first");
    setResult(RESULT_OK, intent);
    finish();
}