回答編集履歴
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コード追加
test
CHANGED
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@@ -1,2 +1,55 @@
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2 次元配列は、配列の配列です。
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Json で言うなら、JSONArray の要素が JSONArray ということになります。
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```java
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import androidx.appcompat.app.AppCompatActivity;
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7
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import android.os.Bundle;
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import android.util.Log;
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import org.json.*;
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import java.util.Arrays;
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public class MainActivity extends AppCompatActivity {
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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try {
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String[][] a = new String[][]{{"a", "b", "c"}, {"d", "e", "f"}};
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String str = toJson(a);
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Log.d("** MainActivity **", "toJson(" + Arrays.deepToString(a) + ")=\"" + str + "\"");
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String[][] b = fromJson(str);
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Log.d("** MainActivity **", "fromJson(\"" + str + "\")=" + Arrays.deepToString(b));
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} catch(JSONException e) {
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e.printStackTrace();
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}
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}
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private String toJson(String[][] a) throws JSONException {
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JSONArray ja = new JSONArray();
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for(String[] aa : a) {
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ja.put(new JSONArray(aa));
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}
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return ja.toString();
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}
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private String[][] fromJson(String str) throws JSONException {
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JSONArray ja = new JSONArray(str);
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String[][] b = new String[ja.length()][ja.getJSONArray(0).length()];
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for(int i = 0; i < ja.length(); i++) {
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JSONArray jaa = ja.getJSONArray(i);
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for(int j = 0; j < jaa.length(); j++) {
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b[i][j] = jaa.getString(j);
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}
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}
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return b;
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}
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}
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```
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```plain
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D/** MainActivity **: toJson([[a, b, c], [d, e, f]])="[["a","b","c"],["d","e","f"]]"
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D/** MainActivity **: fromJson("[["a","b","c"],["d","e","f"]]")=[[a, b, c], [d, e, f]]
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55
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```
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