触摸卡视图时Android卡查看错误
我希望在使用该卡名称触摸每张卡片时收到一条祝酒词：
Android上的XML代码
public void clikimage(View view){
Toast.makeText(MainActivity.this, "Cliked", Toast.LENGTH_SHORT).show();
}
Java代码
/**
* Adding few albums for testing
*/
private void prepareAlbums() {
int[] covers = new int[]{
R.drawable.album1,
R.drawable.album2,
R.drawable.album3,
R.drawable.album4,
R.drawable.album5,
R.drawable.album6,
R.drawable.album7,
R.drawable.album8,
R.drawable.album9,
R.drawable.album10,
R.drawable.album11};
Album a = new Album("True Romance", 13, covers[0]);
albumList.add(a);
a = new Album("Xscpae", 8, covers[1]);
albumList.add(a);
a = new Album("Maroon 5", 11, covers[2]);
albumList.add(a);
a = new Album("Born to Die", 12, covers[3]);
albumList.add(a);
a = new Album("Honeymoon", 14, covers[4]);
albumList.add(a);
a = new Album("I Need a Doctor", 1, covers[5]);
albumList.add(a);
a = new Album("Loud", 11, covers[6]);
albumList.add(a);
a = new Album("Legend", 14, covers[7]);
albumList.add(a);
a = new Album("Hello", 11, covers[8]);
albumList.add(a);
a = new Album("Greatest Hits", 17, covers[9]);
albumList.add(a);
adapter.notifyDataSetChanged();
}
在这段代码中，每张卡都会有同样的吐司..
文本来自此代码。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.CardView
android:id="@+id/card_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_margin="@dimen/card_margin"
android:elevation="3dp"
card_view:cardCornerRadius="@dimen/card_album_radius">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/thumbnail"
android:layout_width="match_parent"
android:layout_height="@dimen/album_cover_height"
android:background="?attr/selectableItemBackgroundBorderless"
android:clickable="true"
android:onClick="clikimage"
android:scaleType="fitXY" />
<TextView
android:id="@+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/thumbnail"
android:paddingLeft="@dimen/album_title_padding"
android:paddingRight="@dimen/album_title_padding"
android:paddingTop="@dimen/album_title_padding"
android:textColor="@color/album_title"
android:textSize="@dimen/album_title" />
<TextView
android:id="@+id/count"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/title"
android:paddingBottom="@dimen/songs_count_padding_bottom"
android:paddingLeft="@dimen/album_title_padding"
android:paddingRight="@dimen/album_title_padding"
android:textSize="@dimen/songs_count" />
<ImageView
android:id="@+id/overflow"
android:layout_width="@dimen/ic_album_overflow_width"
android:layout_height="@dimen/ic_album_overflow_height"
android:layout_alignParentRight="true"
android:layout_below="@id/thumbnail"
android:layout_marginTop="@dimen/ic_album_overflow_margin_top"
android:scaleType="centerCrop"
android:src="@drawable/ic_dots" />
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
手动输入所有卡片。我想设置更多卡片并将其放入循环中。请帮助。
XML TITLE CODE。
08-09 11:35:07.453 3079-3079/com.example.jithin.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.jithin.myapplication, PID: 3079
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.jithin.myapplication/com.example.jithin.myapplication.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.example.jithin.myapplication.MainActivity.onCreate(MainActivity.java:113)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
错误。
<?
$con = mysql_connect("localhost","name_comment","Pass");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("name_comment", $con);
$article_id = $_GET['id'];
if( ! is_numeric($article_id) )
die('invalid article id');
$query = "SELECT * FROM `comments` WHERE `articleid` =$article_id LIMIT 0 , 30";
$comments = mysql_query($query);
echo "<h1>User Comments</h1>";
while($row = mysql_fetch_array($comments, MYSQL_ASSOC))
{
$name = $row['name'];
$options = $row['options'];
$email = $row['email'];
$website = $row['website'];
$comment = $row['comment'];
$timestamp = $row['timestamp'];
$name = htmlspecialchars($row['name'],ENT_QUOTES);
$options = htmlspecialchars($row['options'],ENT_QUOTES);
$email = htmlspecialchars($row['email'],ENT_QUOTES);
$website = htmlspecialchars($row['website'],ENT_QUOTES);
$comment = htmlspecialchars($row['comment'],ENT_QUOTES);
echo " <div style='margin:30px 0px;'>
Name: $name<br />
Options: $options<br />
Email: $email<br />
Website: $website<br />
Comment: $comment<br />
Timestamp: $timestamp
</div>
";
}
mysql_close($con);
?>
2 个答案:
答案 0 :(得分：0)
如果您想从视图中获取吐司的文字， 你需要改变这个＆＃34;点击＆＃34;将吐司中的字符串转换为视图中的文本。 您没有告诉我们包含标题的textView在哪里，但如果它与此ImageView位于相同的RelativeLayout中，那么您可以执行以下操作：
String textFromTextView = ((TextView)((RelativeLayout)view.getParent()).findViewById(R.id.title).getText();
Toast.makeText(MainActivity.this, textFromTextView, Toast.LENGTH_SHORT).show();
答案 1 :(得分：0)
您可以尝试将点击侦听器直接附加到ImageView，如下所示：
ImageView mThumbnailImage = (ImageView) findViewById(R.id.thumbnail);
.....
mThumbnailImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(context, "Cliked", Toast.LENGTH_SHORT).show();
}
});
您可能还想删除：
android:onClick="clikimage"
来自
<ImageView
android:id="@+id/thumbnail"
android:layout_width="match_parent"
android:layout_height="@dimen/album_cover_height"
android:background="?attr/selectableItemBackgroundBorderless"
android:clickable="true"
android:onClick="clikimage"
android:scaleType="fitXY" />
以及您的Activity中的'clikimage'方法。希望这会有所帮助。
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