foreword
In daily development, the API interface has not been deployed yet, but the UI has come out. At this time, local data is often used to build the functional interface, which can often save development time to a great extent. The tools are used directly, and there are not many words say open
1. Project construction
1 Create a project
2 The next project name My15 language java directly finish the creation is complete
3 After creating the project, right-click main to create the capital source file directory and choose as follows
4 Continue to select assets and press Enter to complete the creation
5 Click assets and right click to create a file named JsonData.json. This json file is to put the local Json data according to the format of the server. The project has been built and the next step is to use it.
2. Use steps
1. Import library
Add under build under app
api("com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.30")
api("com.google.code.gson:gson:2.8.6")
Add a warehouse under the build under the project track
maven { url 'https://jitpack.io' }
2. Tools
right click on my15 to create a Tools file, and modify the file to be a tool class for reading local data
public class Tools {
/**
* 读取本地资源文件
*
* @param context 上下文
* @param fileName 本地数据文件名
* @return
*/
public static String getFromAssets(Context context, String fileName) {
InputStreamReader inputReader = null;
BufferedReader bufReader = null;
try {
inputReader = new InputStreamReader(context.getResources().getAssets().open(fileName));
bufReader = new BufferedReader(inputReader);
String line = "";
StringBuilder result = new StringBuilder();
while ((line = bufReader.readLine()) != null)
result.append(line);
return result.toString();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (inputReader != null) {
inputReader.close();
}
if (bufReader != null) {
bufReader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return "";
}
}3 steps to use
1 Right-click on my15 to create an adapter named JsonAdapter to display the train type and time in turn, the entity class and the layout file are below
public class JsonAdapter extends BaseQuickAdapter<JsonBean.DataBean.ResultBean, BaseViewHolder> {
public JsonAdapter(int layoutResId, @Nullable List<JsonBean.DataBean.ResultBean> data) {
super(layoutResId, data);
}
@Override
protected void convert(BaseViewHolder helper, JsonBean.DataBean.ResultBean item) {
helper.setText(R.id.cc_tv, "车次:" + item.getTrain());
helper.setText(R.id.name_tv, "类型:" + item.getName());
helper.setText(R.id.time_tv, "时间:" + item.getTime());
}
}
2 wear layout file text_item_layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="140dp"
android:background="@drawable/linearlayout_underline"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal">
<TextView
android:id="@+id/cc_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="15dp"
android:text="车次" />
<TextView
android:id="@+id/name_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="15dp"
android:text="和谐号" />
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center_vertical">
<TextView
android:id="@+id/time_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:text="2020-10-12" />
</LinearLayout>
</LinearLayout>3 Generate entity class JsonBean based on local Json data
public class JsonBean {
private String code;
private String message;
private DataBean data;
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public DataBean getData() {
return data;
}
public void setData(DataBean data) {
this.data = data;
}
public static class DataBean {
private List<ResultBean> result;
public List<ResultBean> getResult() {
return result;
}
public void setResult(List<ResultBean> result) {
this.result = result;
}
public static class ResultBean {
private String train;
private String name;
private String time;
public String getTrain() {
return train;
}
public void setTrain(String train) {
this.train = train;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTime() {
return time;
}
public void setTime(String time) {
this.time = time;
}
}
}
}
4 Finally, it is used, and it is very simple to use in MainActivity as follows
public class MainActivity extends AppCompatActivity {
private List<JsonBean.DataBean.ResultBean> jsonList = new ArrayList<>();
private JsonAdapter jsonAdapter;
private RecyclerView jsonRv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
jsonRv = findViewById(R.id.json_list);
String fromAssets = Tools.getFromAssets(this, "JsonData.json");
JsonBean jsonBean = new Gson().fromJson(fromAssets, JsonBean.class);
jsonList = jsonBean.getData().getResult();
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
jsonRv.setLayoutManager(layoutManager);
jsonAdapter = new JsonAdapter(R.layout.text_item_layout, jsonList);
jsonRv.setAdapter(jsonAdapter);
jsonAdapter.notifyDataSetChanged();
}
}5 Finally, look at the running screenshot
Summarize
The soldiers and horses have not moved, the food and grass go first, and planning in advance can be better