Android Studio-Image显示在设计视图中但不在模拟器中显示

Question

我正在学习Android应用程序开发.所以当我构建一个简单的应用程序在屏幕上显示两个图像时,我使用了ImageView.图像显示在android工作室设计屏幕中,但是当我尝试使用genymotion模拟器,屏幕只是空白.我无法看到images.here是xml文件.

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="showmebioapp.studio.com.showmebio.MainActivity"
    android:background="@android:color/holo_blue_bright">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:srcCompat="@drawable/vegeta"
        android:layout_marginTop="32dp"
        android:id="@+id/imageVegetaId"
        android:layout_alignParentTop="true"
        android:layout_alignRight="@+id/imageGokuId"
        android:layout_alignEnd="@+id/imageGokuId"
        android:layout_marginRight="32dp"
        android:layout_marginEnd="32dp" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:srcCompat="@drawable/goku"
        android:layout_marginBottom="79dp"
        android:id="@+id/imageGokuId"
        android:layout_marginLeft="62dp"
        android:layout_marginStart="62dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
</RelativeLayout>

主要活动.JAVA

public class MainActivity extends Activity implements View.OnClickListener {

private ImageView vegetaImage;
private ImageView gokuImage;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    vegetaImage=(ImageView)findViewById(R.id.imageVegetaId);
    gokuImage=(ImageView)findViewById(R.id.imageGokuId);
    vegetaImage.setOnClickListener(this);
    gokuImage.setOnClickListener(this);
}

@Override
public void onClick(View v) {

    switch(v.getId()){

        case R.id.imageVegetaId:
            Intent vegetaIntent=new Intent(MainActivity.this,DetailsActivity.class);
            vegetaIntent.putExtra("vegetaBio","hello from vegeta");
            startActivity(vegetaIntent);
            break;
        case R.id.imageGokuId:
            Intent gokuIntent=new Intent(MainActivity.this,DetailsActivity.class);
            gokuIntent.putExtra("gokuBio","hello from goku");
            startActivity(gokuIntent);
            break;
    }
}

}

请帮我找到解决方案.

Answer 1

您正在使用srcCompat而不是使用src,就像使用back goku而不是使用goku一样

  <ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:src="@drawable/vegeta"
    android:layout_marginTop="32dp"
    android:id="@+id/imageVegetaId"
    android:layout_alignParentTop="true"
    android:layout_alignRight="@+id/imageGokuId"
    android:layout_alignEnd="@+id/imageGokuId"
    android:layout_marginRight="32dp"
    android:layout_marginEnd="32dp" />

因为它的srcCompat属性实际上是在AppCompat库中定义的.

重要的是,您需要为此添加适当的命名空间.

的xmlns:应用= "http://schemas.android.com/apk/res-auto"

重要

你得到的东西似乎只是一个可以忽略的lint错误.我试过并有同样的错误,但它工作正常.了解更多信息

快乐编码:)