[英]android camera preview with textview
我在我的 android 應用程序上有相機預覽,但是當我在 xml 中的 TextView 中添加一個“id”時,應用程序不再運行。 你不允許有一個帶有id的textview嗎? 我需要這個是因為我希望在進行相機預覽時在屏幕上更改文本?
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<SurfaceView android:id="@+id/camerapreview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
控制.xml
<?xml version="1.0" encoding="utf-8"?>
<ImageView android:src="@drawable/icon" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_gravity="center"
android:paddingTop="120dp" />
<TextView android:layout_width="wrap_content" android:id="@+id/mind"
android:layout_height="wrap_content" android:text="First Text"
android:layout_gravity="center" android:paddingTop="50dp"
android:textSize="30dp" android:textStyle="bold" android:textColor="#FFFFFF" />
<Button android:id="@+id/takepicture" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:text="Save Image"
android:layout_gravity="center" android:paddingTop="10dp"/>
</LinearLayout>
main.java:
package com.example.androidcamera;
import java.io.IOException;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.ShutterCallback;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.TextView;
public class main extends Activity implements SurfaceHolder.Callback {
Camera camera;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
boolean previewing = false;
LayoutInflater controlInflater = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
getWindow().setFormat(PixelFormat.UNKNOWN);
surfaceView = (SurfaceView) findViewById(R.id.camerapreview);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
controlInflater = LayoutInflater.from(getBaseContext());
View viewControl = controlInflater.inflate(R.layout.control, null);
LayoutParams layoutParamsControl = new LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
this.addContentView(viewControl, layoutParamsControl);
TextView textGenerateDesc = (TextView) findViewById(R.id.mind);
textGenerateDesc.setText("hi");
Button buttonTakePicture = (Button) findViewById(R.id.takepicture);
buttonTakePicture.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
camera.takePicture(myShutterCallback, myPictureCallback_RAW,
myPictureCallback_JPG);
}
});
}
正如我在 xml 中看到的那樣,您將textview
id 指定為“textview”,並在代碼中通過R.id.mind
您是否更改了此處的代碼或您擁有的代碼?
您剛剛錯過了“LinearLayout”的起始標簽
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
rest 相同
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:paddingTop="120dp"
/>
<TextView
android:id="@+id/mind"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:paddingTop="50dp"
android:text="First Text"
android:textColor="#FFFFFF"
android:textSize="30dp"
android:textStyle="bold" />
<Button
android:id="@+id/takepicture"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:paddingTop="10dp"
android:text="Save Image" />
</LinearLayout>
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