How to determine sim card status and read contact information in android

When writing a program, sometimes you may need to obtain some contact information in the SIM card. Before obtaining the SIM card contacts, we usually determine the status of the SIM card first, and then obtain its information after finding the SIM card. With the following code, we can read some information of the contacts in the SIM card.

import android.app.Activity;  
import android.content.Context;  
import android.content.Intent;  
import android.database.Cursor;  
import android.net.Uri;  
import android.os.Bundle;  
import android.telephony.TelephonyManager;  
import android.widget.TextView;  
     
public class PhoneTest extends Activity {  
    private TextView mTextView;  
    protected Cursor mCursor = null;  
    private TelephonyManager mTelephonyManager;  
    private String mString = "";  
         
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
        mTextView = (TextView)findViewById(R.id.text);  
        mTextView.setTextSize(20.3f);  
        isSimExist();  
        if(getSimState() == TelephonyManager.SIM_STATE_READY){  
            mString += "    卡存在\n";  
            getSimContacts("content://icc/adn"); //一般用这一条，如果这条不行的话可以试试下面的一条。  
            getSimContacts("content://sim/adn");//此种读法在我们手机里不能读取，所以，还是用上个uri比较好。  
        }  
        mTextView.setText(mString);  
    }  
         
    private void getSimContacts(String str){  
        Intent intent = new Intent();  
        intent.setData(Uri.parse(str));  
        Uri uri = intent.getData();  
        mCursor = getContentResolver().query(uri, null, null, null, null);  
        if(mCursor == null){  
            mString += "不能从" + str + "读数据\n";  
            return ;  
        }  
        mString += "第一列：" + mCursor.getColumnName(0) + "\n";  
        mString += "第二列：" + mCursor.getColumnName(1) + "\n";  
        mString += "第三列：" + mCursor.getColumnName(2) + "\n";  
        mString += "第四列：" + mCursor.getColumnName(3) + "\n";  
        mString += "列数：" + mCursor.getColumnCount() + "\n";  
        mString += "行数：" + mCursor.getCount() + "\n";  
        if (mCursor != null) {  
            while (mCursor.moveToNext()) {  
                // 取得联系人名字  
                int nameFieldColumnIndex = mCursor.getColumnIndex("name");  
                mString += mCursor.getString(nameFieldColumnIndex)+"    ";  
                // 取得电话号码  
                int numberFieldColumnIndex = mCursor  
                        .getColumnIndex("number");  
                mString += mCursor.getString(numberFieldColumnIndex)+"    ";  
                // 取得邮箱  
                int emailsFieldColumnIndex = mCursor  
                        .getColumnIndex("emails");  
                mString += mCursor.getString(emailsFieldColumnIndex)+"    ";  
                // 取得id  
                int idFieldColumnIndex = mCursor  
                        .getColumnIndex("_id");  
                mString += mCursor.getString(idFieldColumnIndex)+"\n";  
            }  
        }  
        mString += mCursor + "\n";  
        mCursor.close();  
    }  
         
    private int getSimState(){  
        return mTelephonyManager.getSimState();  
    }  
         
    private void isSimExist(){  
        mTelephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);  
         int simState = mTelephonyManager.getSimState();  
     
         switch (simState) {  
     
             case TelephonyManager.SIM_STATE_ABSENT:  
                 mString = "无卡";  
                 // do something  
                 break;  
     
             case TelephonyManager.SIM_STATE_NETWORK_LOCKED:  
                 mString = "需要NetworkPIN解锁";  
                 // do something  
     
                 break;  
     
             case TelephonyManager.SIM_STATE_PIN_REQUIRED:  
                 mString = "需要PIN解锁";  
                 // do something  
                 break;  
     
             case TelephonyManager.SIM_STATE_PUK_REQUIRED:  
                 mString = "需要PUN解锁";  
                 // do something  
                 break;  
     
             case TelephonyManager.SIM_STATE_READY:  
                 mString = "良好";  
                 // do something  
                 break;  
     
             case TelephonyManager.SIM_STATE_UNKNOWN:  
                 mString = "未知状态";  
                 // do something  
                 break;  
         }  
         mTextView.setText(mString);  
    }  
         
}