Question

我有这个imageView，我想首先看不见...... 然后当我单击一个按钮（calculateButton）时，imageView将是可见的。

这是我的ImageView：

<ImageView
     android:id="@+id/imageView1"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_alignRight="@+id/resultLabel"
     android:layout_below="@+id/resultLabel"
     android:src="@drawable/image" />

这是我的calculateButton代码：

     public void calculateClickHandler(View view) {


    if (view.getId() == R.id.calculateButton) {

    EditText weightText = (EditText) findViewById(R.id.weightText);
    EditText heightText = (EditText)findViewById(R.id.heightText);
    TextView resultText = (TextView)findViewById(R.id.resultLabel);


    int weight = (int) Float.parseFloat(weightText.getText().toString());
    int height = (int) Float.parseFloat(heightText.getText().toString());
            int bmiValue = calculateBMI(weight, height);



 String bmiInterpretation = interpretBMI(bmiValue);

 resultText.setText("Your BMI is:" + " " + bmiValue  + " " +  bmiInterpretation); }

    }

  private int calculateBMI (int weight, int height) {

    return (int)  weight * 703 / (height * height) ;

        }
   private String interpretBMI(int bmiValue) {

            if (bmiValue <= 16.0 && bmiValue <= 18.5) {
                return "Underweight";   
            } else if (bmiValue > 18.5 && bmiValue <= 25 ){
                    return "Normal (Healthy)";
            } else if (bmiValue > 25 && bmiValue <= 30  ) {
                return "Overweight";
            } else {
                return "Obese"; }
            }

               }

Answer 1

首先使图像视图不可见，然后在onclick内部使其可见。

所以把这一行放在XML的图像视图中

android:visibility="invisible"

所以你的完整代码看起来像这样。

<ImageView
     android:id="@+id/imageView1"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_alignRight="@+id/resultLabel"
     android:layout_below="@+id/resultLabel"
     android:visibility="invisible"
     android:src="@drawable/image" />

然后在按钮点击事件中显示它。

    imageview.setVisibility(View.visible);

请记住，imageview是ImageView上的对象。所以它看起来像

 ImageView imageview =(ImageView) findViewById(R.id.imageView1);
 imageview.setVisibility(View.visible);

所以就这样说吧。

public void calculateClickHandler(View view) {


    if (view.getId() == R.id.calculateButton) {

    EditText weightText = (EditText) findViewById(R.id.weightText);
    EditText heightText = (EditText)findViewById(R.id.heightText);
    TextView resultText = (TextView)findViewById(R.id.resultLabel);

ImageView imageview =(ImageView) findViewById(R.id.imageView1);
         imageview.setVisibility(View.visible);

         .......
         .......


if (bmiValue <= 16.0 && bmiValue <= 18.5){

imageview1.setVisibility(View.visible);
imageview2.setVisibility(View.invisible);
imageview3.setVisibility(View.invisible);
imageview4.setVisibility(View.invisible);

}else if (your second condition){
imageview1.setVisibility(View.invisible);
imageview2.setVisibility(View.visible);
imageview3.setVisibility(View.invisible);
imageview4.setVisibility(View.invisible);

}else if (your third condition){
imageview1.setVisibility(View.invisible);
imageview2.setVisibility(View.invisible);
imageview3.setVisibility(View.visible);
imageview4.setVisibility(View.invisible);

}else
{
imageview1.setVisibility(View.invisible);
imageview2.setVisibility(View.invisible);
imageview3.setVisibility(View.invisible);
imageview4.setVisibility(View.visible);
}

这里只需用您的ID替换您的图片视图，然后尝试。希望这会对你有所帮助。

Answer 2

您可以设置可见性

android:visibility="invisible"

然后点击按钮

public void calculateClickHandler(View view) {

 ImageView iv =(ImageView) findViewById(R.id.imageView1);
 iv.setVisibility(View.VISIBLE);
}

http://developer.android.com/reference/android/view/View.html#attr_android:visibility

每次按下按钮时都避免初始化imageview

ImageView iv;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_alarm_manager);
    iv =(ImageView) findViewById(R.id.imageView1);
}

Answer 3

OnCreate()设置imageview 不可见，例如imageview.setVisibility(View.INVISIBLE);

和按钮onClick() VISIBLE 就像imageview.setVisibility(View.VISIBLE);

Answer 4

尝试一下

imageview的可见性是看不见的......

<ImageView
 android:id="@+id/imageView1"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_alignRight="@+id/resultLabel"
 android:layout_below="@+id/resultLabel"
 android:src="@drawable/image"
 android:visibility="invisible" />

并在您的代码中...，在按钮上点击此行

imageview.setVisibility(View.visible);

Answer 5

您可能应该在布局XML中将图像定义为不可见... android:visibility="invisible"

您可以使用view.setVisibility(x);修改视图的展示率，其中x为View.INVISIBLE，View.VISIBLE或View.GONE。用onCreate()方法编写此代码。

Button calculateButton = (Button) findViewById(R.id.button1);
calculateButton.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        ImageView imageView =(ImageView) findViewById(R.id.imageView1);
        imageView.setVisibility(View.VISIBLE);

    }
});

Answer 6

首先在xml中设置可见性

 android:visibility="gone"

现在可以在onclick上看到java代码集可见性..

 imageView.setVisibility(View.VISIBLE);

ImageView不可见/可见

6 个答案: