AS add_asaddasa-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_57395890/article/details/125056459

该博客主要展示了在Android应用中，如何使用`FloatingActionButton`启动`EditActivity`进行编辑操作，并通过`onActivityResult`接收返回的数据更新`TextView`内容。在`EditActivity`中，监听`KEYCODE_HOME`和`KEYCODE_BACK`键，实现数据回传并结束当前活动。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

public class MainActivity extends AppCompatActivity {

    final String TAG = "tag";
    FloatingActionButton btn;
    TextView tv;
    ListView lv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn = (FloatingActionButton) findViewById(R.id.fab);
        tv = findViewById(R.id.tv);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,EditActivity.class);
                startActivityForResult(intent,0);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode,int resultCode, Intent data){
        super.onActivityResult(requestCode,resultCode,data);
        String edit = data.getStringExtra("input");
        tv.setText(edit);
    }
}

public class EditActivity extends AppCompatActivity {

    EditText et;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.edit_layout);
        et = findViewById(R.id.et);
    }
    public boolean onKeyDown(int keyCode, KeyEvent event){
        if (keyCode == KeyEvent.KEYCODE_HOME){
            return true;
        }
        else if (keyCode == KeyEvent.KEYCODE_BACK){
            Intent intent = new Intent();
            intent.putExtra("input",et.getText().toString());
            setResult(RESULT_OK,intent);
            finish();
            return true;
        }
        return super.onKeyDown(keyCode,event);

    }
}