Android启动屏幕上没有图片

Question

我制作了一个闪屏，效果非常好，直到我添加了图片。图像不会出现，我复制了与图片完全相同的代码，并将其放在主活动xml中，它成功了。

我可以在设计和蓝图中看到图片，但在我的手机上看不到

splash_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/sapphire"
    android:onClick="connect"
    tools:context=".MainActivity">


    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:fontFamily="sans-serif-condensed-medium"
        android:text="test"
        android:textColor="#8C9EFF"
        android:textSize="40sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.567"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.89" />

    <ImageView
        android:id="@+id/logo"
        android:layout_width="240dp"
        android:layout_height="240dp"
        android:layout_marginTop="200dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0"
        android:contentDescription="logo"
        app:srcCompat="@mipmap/ic_channel_foreground" />

</androidx.constraintlayout.widget.ConstraintLayout>

喷溅活动。JAVA

package raspberrypi.client.android;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.animation.Animation;
import android.widget.TextView;
import android.view.animation.AnimationUtils;


public class SplashActivity extends Activity {

    Handler handler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.splash_activity);

        TextView title = (TextView)findViewById(R.id.title);
        Animation animation=AnimationUtils.loadAnimation(this,R.anim.fadein);
        title.startAnimation(animation);

        handler=new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                Intent intent=new Intent(SplashActivity.this, MainActivity.class);
                startActivity(intent);
                finish();
            }
        },3000);
    }
}

我曾尝试将srccomact更改为src，但在设计中甚至无法显示图片。

Answer 1

这是因为您的图像隐藏在文本视图后面。您的代码应该如下所示：

<?xml version="1.0" encoding="utf-8"?>
  <androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/sapphire"
    android:onClick="connect"
    tools:context=".MainActivity">


<TextView
    android:id="@+id/title"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:fontFamily="sans-serif-condensed-medium"
    android:text="test"
    android:textColor="#8C9EFF"
    android:textSize="40sp"
    app:layout_constraintHorizontal_bias="0.567"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.89" />

<ImageView
    android:id="@+id/logo"
    android:layout_width="240dp"
    android:layout_height="240dp"
    android:layout_marginTop="200dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.497"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/title"
    app:layout_constraintVertical_bias="0.0"
    android:contentDescription="logo"
    app:srcCompat="@mipmap/ic_channel_foreground" />

</androidx.constraintlayout.widget.ConstraintLayout>