Question

我是Android新手，我正试图打开一个按钮打开2个活动，但不适合我。对于前：在Mainacitivity，btn_mathematics和btn_physics打开相同的活动（Main2acitivity）并找到btn_semester1和btn_semester2，每个按钮都会打开2学期模块的其他活动。

如果用户点击了Mainacitivity，请点击： btn_mathematics ---＆gt; btn_semester1 ---＆GT;将有ModulesMAT 如果点击btn_semester1相同的按钮： btn_physics ---＆gt; btn_semester1 ---＆gt;将有ModulesPHY。

MainActivity XML：

<Button
    android:id="@+id/btn_mathematics"
    android:onClick="btn_mathematics"
    android:text="@string/btn_mathematics/>

<Button
    android:id="@+id/btn_physics"
    android:onClick="btn_physics"
    android:text="@string/btn_physics"/>

Main2Activity XML：

<Button
    android:id="@+id/btn_semester1"
    android:onClick="btn_semester1"
    android:text="@string/btn_semester1"/>

<Button
    android:id="@+id/btn_semester2"
    android:onClick="btn_s2"
    android:text="@string/btn_semester2"/>

我想没有必要为ModulesMAT和ModulesPHY添加xml，它与其他的非常相似。

现在是java代码：

MainActivity.java：

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

    public void btn_mathematics (View v)  {
        Intent intent = new Intent(MainActivity.this, Main2Activity.class);
        startActivity(intent);
    }

    `public void btn_physics (View v) {
        Intent intent = new Intent(MainActivity.this, Main2Activity.class);
        startActivity(intent);
    }


}

Main2Activity.java：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);
}



public void btn_semester1 (View v)
{
    Intent i = getIntent();
    String id = i.getStringExtra("id");
    if(id == "btn_mathematics")
    {
         i = new Intent(this, ModulesMAT.class);
        startActivity(i);
    }
    else if (id == "btn_physics")
    {
         i = new Intent(this, ModulesPHY.class);
        startActivity(i);
    }

}


public void btn_semester2 (View v)
{
    Intent i = getIntent();
    String id = i.getStringExtra("id");
    if(id == "btn_mathematics")
    {
        i = new Intent(this, ModulesMAT2.class);
        startActivity(i);
    }
    else if (id == "btn_physics")
    {
        i = new Intent(this, ModulesPHY2.class);
        startActivity(i);
    }

}

Answer 1

在MainActivity中，您可以将用于识别的ID传递给Main2Activity 的 MainActivity

public void btn_mathematics (View v) { Intent intent = new Intent(MainActivity.this, Main2Activity.class); Bundle bundle = new Bundle(); bundle.putString("id","Math"); intent.putExtra(bundle); startActivity(intent); } public void btn_physics (View v) { Intent intent = new Intent(MainActivity.this, Main2Activity.class); Bundle bundle = new Bundle(); bundle.putString("id","Physics"); intent.putExtra(bundle); startActivity(intent); }

<强> Main2Activity

String id; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main2); Bundle bundle = getIntent().getExtras(); id= bundle.getString("id"); } public void btn_semester1 (View v) { if(id == "Math") { i = new Intent(this, ModulesMAT2.class); startActivity(i); } else if (id == "Physics") { i = new Intent(this, ModulesPHY2.class); startActivity(i); } } public void btn_semester2 (View v) { if(id == "Math") { i = new Intent(this, ModulesMAT2.class); startActivity(i); } else if (id == "Physics") { i = new Intent(this, ModulesPHY2.class); startActivity(i); } }

if条件的按钮

1 个答案: