在 Eclipse AVD 中，我得到“不幸的是，Test1 已停止工作”

Question

我确实查看了我可以得到的所有建议，但这些更正已经存在于我的代码中......请看看这个。 基本上，我试图在单击按钮后从主要活动中调用另一个活动。

//Here's the code of my main activity named Test1Activity:
public class Test1Activity extends Activity {

private int clicked=0;
public static final String pass="com.sanjay.test1._clicked";
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
Button button1=(Button) findViewById(R.id.button1);
Button button2=(Button) findViewById(R.id.button2);

button1.setId(1);
button2.setId(2);

button1.setOnClickListener( new OnClickListener() {
    public void onClick(View v) {
      int id = v.getId();
      clicked=id;

    }
});
button1.setOnClickListener( new OnClickListener() {
    public void onClick(View v) {
      int id = v.getId();
      clicked=id;
    }
});Intent i = new Intent(this,Sanjay.class);i.putExtra(pass,clicked);startActivity(i);
}

}

//Now my other Activity code : 
public class Sanjay extends Activity {

/** Called when the activity is first created. */
int a;
TextView text;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.second);

    text=(TextView) findViewById(R.id.text);
    a=getIntent().getExtras().getInt(Test1Activity.pass);

    text.setText(a);
    // TODO Auto-generated method stub
}
}


//And my xml file of the second activity layout resource.
//I am not adding the main.xml as the program runs fine if I pass the startactivity(i) and the intent lines as comments.
<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linearLayout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

Answer 1

您不能使用 int 调用 setText，因为在这种情况下它期望 int 是资源的 ID。

改为字符串：

text.setText("" + a);

Answer 2

您的代码中有一些错误。

1) 您仅将 onclicklistener 注册到 button1。 （两次）

2) 你把你的意图放在按钮的 OnClickListener() 之外。你应该把它放在 OnClickListener();

试试这个方法：

public class Test1Activity extends Activity {
private int clicked=0;
public static final String pass="com.sanjay.test1._clicked";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button button1=(Button) findViewById(R.id.button1);
Button button2=(Button) findViewById(R.id.button2);
button1.setId(1);
button2.setId(2);
button1.setOnClickListener( new OnClickListener() {
public void onClick(View v) {
  int id = v.getId();
  clicked=id;      
Intent i = new Intent(this,Sanjay.class);
i.putExtra(pass,clicked);
startActivity(i);      
}
});

button2.setOnClickListener( new OnClickListener() {
public void onClick(View v) {
  int id = v.getId();
  clicked=id;
Intent i = new Intent(this,Sanjay.class);
i.putExtra(pass,clicked);
startActivity(i);      
}
});
}

Answer 3

如果你想在你的活动中实现 OnClickListener，你可以使用这个。

试试这个：

public class Test1Activity extends Activity implements View.OnCLickListener(){
private int clicked=0;
public static final String pass="com.sanjay.test1._clicked";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button button1=(Button) findViewById(R.id.button1);
Button button2=(Button) findViewById(R.id.button2);    
button1.setOnClickListener(this);
button2.setOnClickListener(this);    
}

@Override
OnClick(View v)
{
  switch(v.getId())
  {
  case R.id.button1:
   //clicked = v.getId();
   //   OR
   //clicked = 1
   Intent i = new Intent(Test1Activity.this,Sanjay.class);
   i.putExtra(pass,clicked);
   startActivity(i);      
   break;

  case R.id.button2:
   //clicked = v.getId();
   //   OR
   //clicked = 2
   Intent i = new Intent(Test1Activity.this,Sanjay.class);
   i.putExtra(pass,clicked);
   startActivity(i);        
  }
}
}