android 将 if else 与 getStringextra 一起使用不起作用

Question

所以嗯，我的 if else 有问题它只显示 else 选项而不显示 if(data == "heavy") 我只希望类型等于重而不是轻，然后其中一个线性布局消失不可见，反之亦然……请帮帮我……

这是我的代码：

    Intent intentType = getIntent();
    String valueType = intentType.getStringExtra("type");
    EditText displayType = (EditText) findViewById(R.id.editTextType1);
    displayType.setText(valueType);

    LinearLayout one = (LinearLayout) findViewById(R.id.type1);
    LinearLayout two = (LinearLayout) findViewById(R.id.type2);


    String data = displayType.getText().toString();
    if(data == "heavy") {
        one.setVisibility(View.VISIBLE);
        two.setVisibility(View.INVISIBLE);
    } else {
        one.setVisibility(View.INVISIBLE);
        two.setVisibility(View.VISIBLE);
    }

来自先前 .java 文件的代码：

    EditText units = (EditText) findViewById(R.id.editTextUnits);
    units.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(new Intent(MainActivity.this, MainActivity3.class));
            Intent intentType = getIntent();
            String valueType = intentType.getStringExtra("type");
            intent.putExtra("type", valueType);
            startActivity(intent);
        }
    });

另一个 .java 文件

 private void SetOnClickWeightButton(){
        Button btn = (Button) findViewById(R.id.buttonWeight);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity2.this, MainActivity.class);
                intent.putExtra("type", "heavy");
                startActivity(intent);
            }
        });
    }
private void SetOnClickLengthtButton(){

    Button btn = (Button) findViewById(R.id.buttonLength);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(MainActivity2.this, MainActivity.class);
            intent.putExtra("type", "light");
            startActivity(intent);
        }
    });
}

Answer 1

使用String.equals for comparing String variables value instead of ==

android 将 if else 与 getStringextra 一起使用不起作用

android using if else with getStringextra doesnt work

android

if-statement

android-intent