我想以TableView
的形式打印数据库中的数据。如何打印数据。
我使用的数据库是SQLite
。
答案 0 :(得分:2)
只需从您的API或服务Information of JSON中获取数据,然后遵循以下参考即可。
答案 1 :(得分:0)
创建文件fetchData.java
import android.os.AsyncTask;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class fetchData extends AsyncTask<Void,Void,Void> {
String data ="";
String dataParsed = "";
String singleParsed ="";
@Override
protected Void doInBackground(Void... voids) {
try {
URL url = new URL("https://api.myjson.com/bins/107msz");
HttpURLConnection httpURLConnection = (HttpURLConnection)
url.openConnection();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new
InputStreamReader(inputStream));
String line = "";
while(line != null){
line = bufferedReader.readLine();
data = data + line;
}
JSONArray JA = new JSONArray(data);
for(int i =0 ;i <JA.length(); i++){
JSONObject JO = (JSONObject) JA.get(i);
singleParsed = "Name:" + JO.get("name") + "\n"+
"Password:" + JO.get("password") + "\n";
dataParsed = dataParsed + singleParsed +"\n" ;
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
MainActivity.data.setText(this.dataParsed);
}
}
另一个文件MainActivity.java
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
Button click;
public static TextView data;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
click = (Button) findViewById(R.id.button);
data = (TextView) findViewById(R.id.fetcheddata);
click.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
fetchData process = new fetchData();
process.execute();
}
});
}
}
在您的Activity_main.xml中编写此代码
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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="com.abhishekpanwar.receivedatajson.MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click Me!"
android:layout_marginBottom="10dp"
android:id="@+id/button"/>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@id/button">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp"
android:textSize="40sp"
android:id="@+id/fetcheddata"
android:fontFamily="sans-serif"
android:hint="Fetched Text Here!!!"/>
</ScrollView>
</RelativeLayout>