AndroidはIntentを使用してアクティビティ間でデータを転送

ダイレクトコード
最初のActivity:

public class MainActivity extends Activity {
    //    ，      
    private static final int TO_SECOND_ACTIVITY = 1;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button gotoSecond = (Button) findViewById(R.id.button_1);
        gotoSecond.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, SecondActivity.class);
                String data = "  SecondActivity";
                intent.putExtra("extra_data", data);
                startActivityForResult(intent, TO_SECOND_ACTIVITY);
            }
        });
    }

    //     startActivityForResult()     SecondActivity
    //  SecondActivity      onActivityResult()  
    //           
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == TO_SECOND_ACTIVITY) {
            switch (resultCode) {
            case RESULT_OK:
                String returnData = data.getStringExtra("data_return");
                Toast.makeText(this, returnData, Toast.LENGTH_LONG).show();
                break;
            default:
            }
        }
    }    
}

2番目のActivity:

public class SecondActivity extends Activity{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.second_activity);
        
        //           
        Intent intent = getIntent();
        String data = intent.getStringExtra("extra_data");
        Toast.makeText(this, data, Toast.LENGTH_LONG).show();
        
        //          Activity
        Button finishThis = (Button) findViewById(R.id.button_finish_2);
        finishThis.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                returnDataAndClose();
            }
        });
    }
    
    //            
    private void returnDataAndClose(){
        Intent intent = new Intent();
        intent.putExtra("data_return", "    ");
        setResult(RESULT_OK, intent);
        finish();
    }

    //                
    @Override
    public void onBackPressed() {
        returnDataAndClose();
    }
    
    
}

本文はブロガーのオリジナル文章で、ブロガーの許可を得ずに転載してはならない.
転載先:https://www.cnblogs.com/kinglearnjava/p/4883263.html