Question

我使用单选按钮On和Off创建了一个活动。当用户单击“开”时，图像出现，并且“关闭”图像消失。一切正常，但当用户不小心点击图像时，应用程序将停止工作。图像没有点击功能。请参阅下面的代码。 XML文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"      android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.android.Recipe3"
android:onClick="Home"
android:clickable="true">
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="Beth&apos;s Spicy Oatmeal"
    android:id="@+id/textView6"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:text="1/2 cup butter, softened"
    android:id="@+id/textView22"
    android:layout_below="@+id/textView6"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:text="1 cup packed light brown sugar"
    android:id="@+id/textView23"
    android:layout_below="@+id/textView22"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:text="1 1/2 cups all-purpose flour"
    android:id="@+id/textView24"
    android:layout_below="@+id/textView23"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:text="3 cups rolled oats"
    android:id="@+id/textView25"
    android:layout_below="@+id/textView24"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:text="1 teaspoon ground cinnamon"
    android:id="@+id/textView26"
    android:layout_below="@+id/textView25"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Home"
    android:id="@+id/button9"
    android:layout_below="@+id/textView26"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:clickable="true"
    android:enabled="true"
    android:onClick="HomePage" />

<RadioGroup
    android:layout_width="120dp"
    android:layout_height="49dp"
    android:orientation="horizontal"
    android:id="@+id/radioGroup2"
    android:layout_alignTop="@+id/button9"
    android:layout_toRightOf="@+id/textView23"
    android:layout_toEndOf="@+id/textView23">

    <RadioButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="On"
        android:id="@+id/radioButton8"
        android:checked="true"
        android:button="@android:drawable/btn_radio"
        android:enabled="true" />

    <RadioButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Off"
        android:id="@+id/radioButton9"
        android:layout_gravity="center_horizontal"
        android:checked="false"
        android:button="@android:drawable/btn_radio"
        android:enabled="true"
        android:clickable="true" />
</RadioGroup>

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Image"
    android:id="@+id/textView27"
    android:layout_alignBaseline="@+id/button9"
    android:layout_alignBottom="@+id/button9"
    android:layout_toLeftOf="@+id/radioGroup2"
    android:layout_toStartOf="@+id/radioGroup2" />

<ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/imageView3"
    android:src="@drawable/beth"
    android:layout_alignParentRight="false"
    android:layout_alignParentEnd="false"
    android:layout_below="@+id/radioGroup2"
    android:layout_marginBottom="-30dp" />
</RelativeLayout>

Java代码：

import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageView;
import android.widget.RadioGroup;
public class Recipe3 extends ActionBarActivity {
ImageView imageView3;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_recipe3);
    imageView3 = (ImageView) findViewById(R.id.imageView3);
    RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radioGroup2);

    radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
               if (checkedId == R.id.radioButton8) {
                imageView3.setVisibility(View.VISIBLE);
            } else if (checkedId == R.id.radioButton9) {
                imageView3.setVisibility(View.GONE);
            }
        }
    });
}



@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_recipe3, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}
public void HomePage(View v){
    Intent intent=new Intent(v.getContext(),Login.class);
    startActivity(intent);
}}

Answer 1

错误是Android无法找到Home(View view)方法实现。

当您单击ImageView时，没有任何onClick for ImageView，因此它将其click事件传递给其父视图，意味着RelativeLayout并且为相对布局编写了onClick="Home"但未找到实现在你的活动中。

因此，android无法找到public void Home(View view) method。

从android:onClick="Home"移除RelativeLaout这一行，或在您的活动中实施public void Home(View view)方法。

单击图像时应用程序停止工作

1 个答案: