Android二维码扫描开发和二维码的生成
下面看完成过程：
1.先导入外界的类库 BarCodeTest
2新建一个项目：
在布局中定义
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<Button
android:id="@+id/btnscon"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="开始扫描" />
<TextView
android:id="@+id/tv1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="show" />
</LinearLayout>在MainActivity.java中
package com.example.testqrcode;
import java.security.spec.EncodedKeySpec;
import com.google.zxing.WriterException;
import com.zxing.activity.CaptureActivity;
import com.zxing.encoding.EncodingHandler;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.ToggleButton;
public class MainActivity extends Activity {
private Button scanButton,btngen;
private TextView tvshow;
private EditText edt1;
private ImageView iv1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
scanButton=(Button) findViewById(R.id.btnscon);
tvshow=(TextView) findViewById(R.id.tv1);
scanButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.d("MainActivity", "可以扫描二维码了");
Intent startSan=new Intent(MainActivity.this,CaptureActivity.class);
//startActivity(startSan);
startActivityForResult(startSan, 0);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if(resultCode==RESULT_OK){
String result=data.getExtras().getString("result");
tvshow.setText(result);
}
}
}
另外这个CaptureActivity.class是外部的类，所以要在 AndroidManifest.xml中定义
找到BarCodeTest的AndroidManifest.xml，会发现有这样一段话
<activity
android:configChanges="orientation|keyboardHidden"
android:name="com.zxing.activity.CaptureActivity"
android:screenOrientation="portrait"
android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
android:windowSoftInputMode="stateAlwaysHidden" >
</activity> 把这个类的声明复制到你的项目中去
运行之后，会出现这样，反馈的信息
那么怎么根据输入的值生成一个二维码呢？
在布局中定义:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<EditText
android:id="@+id/edt1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入要编码的内容" >
</EditText>
<Button
android:id="@+id/btngen"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="生成二维码" />
<ImageView
android:id="@+id/iv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
/>
</LinearLayout>在MainActivity.java中
package com.example.testqrcode;
import java.security.spec.EncodedKeySpec;
import com.google.zxing.WriterException;
import com.zxing.activity.CaptureActivity;
import com.zxing.encoding.EncodingHandler;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.ToggleButton;
public class MainActivity extends Activity {
private Button scanButton,btngen;
private TextView tvshow;
private EditText edt1;
private ImageView iv1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvshow=(TextView) findViewById(R.id.tv1);
btngen=(Button) findViewById(R.id.btngen);
edt1=(EditText) findViewById(R.id.edt1);
iv1=(ImageView) findViewById(R.id.iv1);
btngen.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String in=edt1.getText().toString();
if(in.equals("")){
Log.d("MainActivity", "请输入文本");
}
try {
Bitmap qrcode=EncodingHandler.createQRCode(in, 400);
iv1.setImageBitmap(qrcode);
} catch (WriterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
}生成的二维码会放在定义的ImgeView里（这里是放在ImgeView，当然你可以根据你项目的需求，放在自己 想放的地方，方便我们灵活运用）