android上实现二维码生成和扫描

先在androidstudio上导入libzing的Module，然后再app上把那个libzing添加上去，这样我们的app就关联了那个libzing库了

然后我们就只在app这个工程下写代码就行了。activity_main.xml布局如下

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.example.qrcode.MainActivity">    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:onClick="scan"        android:text="扫描二维码" />    <TextView        android:id="@+id/tv_ruselt"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:textSize="26sp" />    <EditText        android:id="@+id/et_text"        android:layout_width="match_parent"        android:layout_height="wrap_content" />    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:onClick="make"        android:text="生成二维码" />    <CheckBox        android:id="@+id/is_logo"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="check" />    <ImageView        android:id="@+id/img"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:src="@mipmap/ic_launcher" /></LinearLayout>

Mainactivity.java

public class MainActivity extends AppCompatActivity {    private TextView mTv_Ruslet;    private EditText mInput;    private ImageView mImg;    private CheckBox isLogo;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mTv_Ruslet = (TextView) findViewById(R.id.tv_ruselt);        mInput = (EditText) findViewById(R.id.et_text);        mImg = (ImageView) findViewById(R.id.img);        isLogo = (CheckBox) findViewById(R.id.is_logo);    }    /**     * 生成二维码     */    public void make(View view) {        String input = mInput.getText().toString().trim();        //生成二维码，然后为二维码增加logo        Bitmap bitmap = EncodingUtils.createQRCode(input, 500, 500,                isLogo.isChecked() ? BitmapFactory.decodeResource(getResources(),                        R.mipmap.ic_launcher) : null        );        mImg.setImageBitmap(bitmap);    }    /**     * 扫描二维码     */    public void scan(View view) {        startActivityForResult(new Intent(MainActivity.this, CaptureActivity.class), 0);    }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        super.onActivityResult(requestCode, resultCode, data);        if (resultCode == RESULT_OK) {            Bundle bundle = data.getExtras();            String result = bundle.getString("result");            mTv_Ruslet.setText(result);            mInput.setText(result);        } else if (resultCode == RESULT_CANCELED) {            mTv_Ruslet.setText("扫描出错");        }    }}

注意一下，版本必须在16或16以上

运行结果：扫描跟生成二维码都是ok的