我的Android是新的,在网上找了一些很好的教程,所以我试图用一个if-else
陈述一个简单的活动。我想“正确与错误”的提示/ Toast
:如果else语句中的Android
Button page1 = (Button) findViewById(R.id.button2);
page1.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
final ImageView iv1 = (ImageView) findViewById(R.id.imageView1);
if (iv1.equals(R.drawable.airplane1)) {
Toast.makeText(getApplicationContext(), "Correct",
Toast.LENGTH_SHORT).show();
} else if (iv1.equals(R.drawable.airplane2)) {
Toast.makeText(getApplicationContext(), "Please put an answer",
Toast.LENGTH_SHORT).show();
} else if (iv1.equals(R.drawable.airplane3)){
Toast.makeText(getApplicationContext(), "Wrong",
Toast.LENGTH_SHORT).show();
}
}
});
我不知道什么是错误的,我if-else
声明,但从未提示都没有。我试图消除(iv1.equals(R.drawable.airplane3))
和(iv1.equals(R.drawable.airplane2))
则只显示错误的吐司。我似乎无法做出正确的提示。
这里是我班的全码:
public class MainActivity extends Activity {
private static final Random imagerandom = new Random();
private static final Integer[] Imagesnumber =
{ R.drawable.airplane1, R.drawable.airplane2, R.drawable.airplane3, };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Integer a = Imagesnumber[imagerandom.nextInt(Imagesnumber.length)];
final ImageView iv = (ImageView) findViewById(R.id.imageView1);
View nextButton = findViewById(R.id.button1);
nextButton.setOnClickListener(new Button.OnClickListener() {
public void onClick(View V) {
int resource = Imagesnumber[imagerandom.nextInt(Imagesnumber.length)];
iv.setImageResource(resource);
}
});
Button page1 = (Button) findViewById(R.id.button2);
page1.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
final ImageView iv1 = (ImageView) findViewById(R.id.imageView1);
if (iv1.equals(R.drawable.airplane1)) {
Toast.makeText(getApplicationContext(), "Correct",
Toast.LENGTH_SHORT).show();
} else if (iv1.equals(R.drawable.airplane2)) {
Toast.makeText(getApplicationContext(), "Please put an answer",
Toast.LENGTH_SHORT).show();
} else if (iv1.equals(R.drawable.airplane3)){
Toast.makeText(getApplicationContext(), "Wrong",
Toast.LENGTH_SHORT).show();
}
}
});
}
}
比较的
int
让我看看,如果我理解正确的话,你想看到的图像显示在YOUT' iv1'? – 2013-02-26 18:40:40是我真的想看看是否成像的使用,如果其他人我真的不太知道什么是错在IV1显示的是正确的还是错误的,如果我else语句 – NewbieontheSide 2013-02-26 18:42:21
你缺少其他condition.i意味着其犯规的条件满足您指定 – 2013-02-26 18:44:10