在android 开发中碰到从一个activity转到第二个activity时
第一个activity中的imageView图片可以显示
第二个activity中的imageView无法显示,但是可以显示背景色
求大神解答原因
mainActivity
package com.example.yuexiangpu2;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import java.io.File;
import java.io.*;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private Button btnok;
private Button btnrecord;
private Button btncancel;
private Button btnlisten;
private MyMediaPlayer myMediaPlayer;
private MyMediaRecorder myMediaRecorder;
private File soundFile;
//选择视图
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
//初始化视图
private void initView() {
btnok = (Button) findViewById(R.id.btnok);
btnrecord = (Button)this.findViewById(R.id.btnrecord);
btncancel = (Button)this.findViewById(R.id.btncancel);
btnlisten = (Button)this.findViewById(R.id.btnlisten);
//btnok跳转视图
btnok.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, FinishRecordActivity.class);
startActivity(intent);
}
});
第二个activity
package com.example.yuexiangpu2;
import android.app.Activity;
import android.os.Bundle;
public class FinishRecordActivity extends Activity{
//设置视图
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_finishrecord);
}
}
MainActivity的layout
<?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"
tools:context=".MainActivity">
<ImageView
android:id="@+id/imgrecording"
android:layout_width="300dp"
android:layout_height="300dp"
android:layout_alignParentTop="true"
android:background="#2B2B2B"
android:contentDescription="@string/app_name"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.299"
app:srcCompat="@drawable/recording" />
<Button
android:id="@+id/btnrecord"
android:layout_width="220dp"
android:layout_height="220dp"
android:layout_centerHorizontal="true"
android:background="#00000000"
app:layout_constraintBottom_toBottomOf="@+id/imgrecording"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/imgrecording"
app:layout_constraintVertical_bias="1.0" />
<Button
android:id="@+id/btnok"
android:layout_width="150dp"
android:layout_height="50dp"
android:layout_marginTop="56dp"
android:background="@drawable/ok"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imgrecording" />
<Button
android:id="@+id/btncancel"
android:layout_width="150dp"
android:layout_height="50dp"
android:layout_marginStart="68dp"
android:layout_marginLeft="68dp"
android:layout_marginBottom="48dp"
android:background="@drawable/cancel"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.33"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/btnok"
app:layout_constraintVertical_bias="1.0" />
<Button
android:id="@+id/btnlisten"
android:layout_width="150dp"
android:layout_height="50dp"
android:background="@drawable/listen"
app:layout_constraintBottom_toTopOf="@+id/btncancel"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/btnok"
app:layout_constraintVertical_bias="0.54" />
</androidx.constraintlayout.widget.ConstraintLayout>
第二个activity的layout
<?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"
tools:context=".MainActivity">
<ImageView
android:id="@+id/imgrecording"
android:layout_width="300dp"
android:layout_height="300dp"
android:layout_alignParentTop="true"
android:contentDescription="@string/app_name"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.299"
app:srcCompat="@drawable/recording" />
<Button
android:id="@+id/btnconvert"
android:layout_width="150dp"
android:layout_height="50dp"
android:layout_marginTop="76dp"
android:background="@drawable/convert"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imgrecording" />
<Button
android:id="@+id/btnsave"
android:layout_width="150dp"
android:layout_height="50dp"
android:background="@drawable/save"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/btnconvert"
app:layout_constraintVertical_bias="0.33" />
</androidx.constraintlayout.widget.ConstraintLayout>