Question

我正在学习Android，我在主要活动中创建了两个按钮，然后从每个按钮我要打开新活动，按钮2正在工作但按钮1不起作用，我的代码：

public class MainActivity extends Activity {
    Button btn;
    Button btn2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn = (Button) findViewById(R.id.button2);
        btn2 = (Button) findViewById(R.id.button1);

        btn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(MainActivity.this, Allactivities.class);
                startActivity(intent);
                Intent i = new Intent(MainActivity.this, Review.class);
                startActivity(i);
            }
        });
    }
}

Xml代码：

<Button
    android:id="@+id/button2"
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:layout_above="@+id/button1"
    android:layout_marginBottom="26dp"
    android:background="@drawable/btnbluee"
    android:text="@string/button_tittle"
    android:onClick="onClick" />

<Button
    android:id="@+id/button1"
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="192dp"
    android:background="@drawable/btnorange"
    android:text="@string/button_title"
    android:onClick="onClick" />

Answer 1

按钮2正在工作但按钮1无效，

这是因为你需要为每个按钮添加一个监听器：

 btn.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent intent = new Intent(MainActivity.this,Allactivities.class);
            startActivity(intent);
            Intent i = new Intent(MainActivity.this,Review.class);
            startActivity(i);

        }
    });

和

btn2.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent intent = new Intent(MainActivity.this,Allactivities.class);
            startActivity(intent);
            Intent i = new Intent(MainActivity.this,Review.class);
            startActivity(i);

        }
    });

只是一个建议..

尝试在布局和代码之间保持一致，你将不遗余力地在脖子上......

 btn = (Button)findViewById(R.id.button2);
 btn2= (Button)findViewById(R.id.button1);

必须是：

 btn = (Button)findViewById(R.id.button1);
 btn2= (Button)findViewById(R.id.button2);

Answer 2

就这样做：

public class MainActivity extends Activity {
    Button btn;
    Button btn2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn = (Button) findViewById(R.id.button2);
        btn2 = (Button) findViewById(R.id.button1);

        btn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent i = new Intent(MainActivity.this, Review.class);
                startActivity(i);
            }
        });

        btn2.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, Allactivities.class);
                startActivity(intent);
            }
        });
    }
}

Answer 3

试试这个：

//set listener button 2 (btn)
btn.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        Intent intent = new Intent(MainActivity.this,Allactivities.class) ;
        startActivity(intent) ;
    }
});

//set listener button 1 (btn2)
btn2.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        Intent i = new Intent(MainActivity.this,Review.class) ;
        startActivity(i) ;
    }
});

Answer 4

所选答案还可以，但您可以使用此示例改进解决方案：

public class Main2Activity extends Activity implements View.OnClickListener {
    Button btn;
    Button btn2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn = (Button) findViewById(R.id.button1);
        btn2 = (Button) findViewById(R.id.button2);

        btn.setOnClickListener(this);
        btn2.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        Intent intent  = null;
        switch (v.getId()){
            case R.id.button1: {
                intent = new Intent(MainActivity.this, Allactivities.class);
            }break;
            case R.id.button2: {
                intent = new Intent(MainActivity.this, Review.class);
            }break;
        }
        if(intent != null){
            startActivity(intent);
        }
    }
}

使用onClick你可以处理要求他们的id的按钮动作，你会写更少的代码。我只发布我的解决方案以改进或提供另一种选择。

两个按钮打开两个新活动

4 个答案: