Question

profile.java

public class ProfileActivity extends AppCompatActivity {

    private TextView tvEmail;

     @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate( savedInstanceState );
        setContentView( R.layout.activity_profile );
        tvEmail = (TextView) findViewById(R.id.tvEmailProfile);
        tvEmail.setText(getIntent().getExtras().getString("Email"));
    }
}

Answer 1

可能您的意图中没有多余的名称“ Email”，您应该在尝试在TextView中进行设置之前进行检查：

public class ProfileActivity extends AppCompatActivity {

    private TextView tvEmail;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate( savedInstanceState );
        setContentView( R.layout.activity_profile );
        tvEmail = (TextView) findViewById(R.id.tvEmailProfile);
        if(getIntent().hasExtra("Email")){
            tvEmail.setText(getIntent().getExtras().getString("Email"));
        }
    }
}

这将解决NullPointer问题。但是，您应该检查键“ Email”是否确实在找得到。

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