java - Android putExtra 推送数据使用相同的按键从不同的按钮

Question

我有一个代码，使用 putextra 方法将数据从 Activity 推送到另一个 Activity ，我想使用相同的键推送不同的值 代码:

String int_value = "int_value";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button btn1 = (Button) findViewById(R.id.btn1);
    btn1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            Intent intent = new Intent(MainActivity.this, SecondScreen.class);
            intent.putExtra(int_value , 0);
            startActivity(intent);
        }
    });

    Button btn2 = (Button) findViewById(R.id.btn2);
    btn2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            Intent intent = new Intent(MainActivity.this, SecondScreen.class);
            intent.putExtra(int_value , 1);
            startActivity(intent);
        }
    });

在下一个 Activity 中:

int value;
String int_value = "int_value";

View myLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second_screen);

    Intent intent = getIntent();
    int temp = intent.getIntExtra(int_value, value);


    myLayout = findViewById(R.id.myLayout);

    switch (value){

        case 0:
            myLayout.setBackgroundResource(R.drawable.a);
            Log.e("VALUE" , String.valueOf(value));
            break;
        case 1:
            myLayout.setBackgroundResource(R.drawable.b);
            Log.e("VALUE" , String.valueOf(value));
            break;

    }

但是背景总是变成a.jpg，尽管我通过了0和1(或者至少我认为我做到了......) 这里有什么问题吗？

Answer 1

只需将开关中的值更改为temp

switch ( temp){

    case 0:
        myLayout.setBackgroundResource(R.drawable.a);
        Log.e("VALUE" , String.valueOf(value));
        break;
    case 1:
        myLayout.setBackgroundResource(R.drawable.b);
        Log.e("VALUE" , String.valueOf(value));
        break;

}

because you are saving the value inside temp

int temp = intent.getIntExtra(int_value, value);