示例代码:
//错误代码 Button button = (Button) findViewById(R.id.btnSubmit1);
//正确代码 Button button = (Button) findViewById(R.id.btnSubmit);
//错误的activity声明
//正确的activity声明
dependencies { //漏掉了这个依赖库 implementation 'com.android.support:appcompat-v7:28.0.0' }
//错误的传参方式 Intent intent = new Intent(MainActivity.this, SecondActivity.class); intent.putExtra("name", "John"); startActivity(intent);
//正确的传参方式 Intent intent = new Intent(MainActivity.this, SecondActivity.class); intent.putExtra("username", "John"); startActivity(intent);
//错误的启动方式 Intent intent = new Intent(MainActivity.this, SecondActivity