android中 把json字符串从文件中去除，转换为一个 自定义对象的list中

主要类：（这里用到一个gson。要想libs导入gson的一个jar）

public class FileConfigActivity extends Activity {
// private static final String JSONString =
// "[{\"name\":\"Michael\",\"age\":20},"
// + "{\"name\":\"Mike\",\"age\":21}]";
Button writeJsonButton;
Button readJsonButton;


@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);


writeJsonButton = (Button) findViewById(R.id.btnWriteJson);
readJsonButton = (Button) findViewById(R.id.btnReadJson);
writeJsonButton.setOnClickListener(new OnClickListener() {


public void onClick(View v) {
// TODO Auto-generated method stub
writeJsonFile();
}
});


readJsonButton.setOnClickListener(new OnClickListener() {


public void onClick(View v) {
// TODO Auto-generated method stub
readJsonFile();
}
});
}


// 写json
public void writeJsonFile() {
JSONCreateDemoActivity jsoncreate = new JSONCreateDemoActivity();
jsoncreate.WriteJson();


}


// 读json
public void readJsonFile() {
String fileContent = readAssetsFileString();
// 返回json转换好的对象list
List<Configuration> userslist =  parseConfigFromJson(fileContent);


for (int i = 0; i < userslist.size(); i++) {
Configuration co = userslist.get(i);
Toast.makeText(this, Integer.toString(co.getID()),
Toast.LENGTH_LONG).show();
Toast.makeText(this, co.getLineColor(), Toast.LENGTH_LONG).show();
Toast.makeText(this, co.getFillColor(), Toast.LENGTH_LONG).show();
Toast.makeText(this, Integer.toString(co.getLineSpan()),
Toast.LENGTH_LONG).show();
Toast.makeText(this, Integer.toString(co.getLineWidth()),
Toast.LENGTH_LONG).show();
Toast.makeText(this, Boolean.toString(co.getDisplay()),
Toast.LENGTH_LONG).show();
Toast.makeText(this, Boolean.toString(co.getSelected()),
Toast.LENGTH_LONG).show();
}
}


public List<Configuration> parseConfigFromJson(String jsonData) {
Type listType = new TypeToken<List<Configuration>>() {
}.getType();
Gson gson = new Gson();
List<Configuration> userslist = gson.fromJson(jsonData, listType);
return userslist;
}


public String readAssetsFileString() {
String str = null;
try {
InputStream is = getAssets().open("about.txt");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
str = new String(buffer);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return str;
}


}

==============

对象 的类为：一个configuration类：

这个类的属性名和json中的字段一一对应：

public class Configuration {
private int ID;
private String LineColor;
private String FillColor;
private int LineSpan;
private int LineWidth;
private boolean Display;
private boolean Selected;
public int getID() {
return ID;
}
public void setID(int ID){
this.ID=ID;
}

public String getLineColor(){
return LineColor;
}
public void setLineColor(String LineColor){
this.LineColor=LineColor;
}

public String getFillColor() {
return FillColor;
}
public void setFillColor(String FillColor) {
this.FillColor=FillColor;
}

public int getLineSpan() {
return LineSpan;
}
public void setLineSpan(int LineSpan) {
this.LineSpan=LineSpan;
}

public int getLineWidth(){
return LineWidth;
}
public void setLineWidth(int LineWidth){
this.LineWidth=LineWidth;
}

public boolean getDisplay(){
return Display;
}
public void setDisplay(boolean Display){
this.Display=Display;
}

public boolean getSelected() {
return Selected;
}
public void setSelected(boolean Selected){
this.Selected=Selected;
}


}

===========================

assets文件夹下的txt文件内容为一个json字符串：

[{"ID":1,"LineColor":"187 255 255","FillColor":"187 255 255","LineSpan":10,"LineWidth":1,"Display":true,"Selected":true},
 {"ID":2,"LineColor":"187 255 255","FillColor":"187 255 255","LineSpan":10,"LineWidth":1,"Display":true,"Selected":true},
 {"ID":3,"LineColor":"187 255 255","FillColor":"187 255 255","LineSpan":10,"LineWidth":1,"Display":true,"Selected":true},
 {"ID":4,"LineColor":"187 255 255","FillColor":"187 255 255","LineSpan":10,"LineWidth":1,"Display":true,"Selected":true}
]