hzuapps#89 hzuapps#125 实验3 Android资源使用编程

提交res/drawable及图片使用的代码

app/src/main/java/edu/hzuapps/androidworks/homeworks/net1314080903112/FileExplorerActivity_net1314080903112.java

@@ -0,0 +1,83 @@
+package edu.hzuapps.androidworks.homeworks.net1314080903112;
+
+import android.content.Intent;
+import android.os.Environment;
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.AdapterView;
+import android.widget.ListView;
+import android.widget.SimpleAdapter;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class FileExplorerActivity_net1314080903112 extends AppCompatActivity implements AdapterView.OnItemClickListener {
+
+    ListView listView;
+    SimpleAdapter adapter;
+    String rootPath = Environment.getExternalStorageDirectory().getPath();
+    String currentPath = rootPath;
+    List<Map<String, Object>> list = new ArrayList<>();
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_file_explorer_net1314080903112);
+        listView = (ListView) findViewById(R.id.list_view);
+        adapter = new SimpleAdapter(this, list, R.layout.list_item_net1314080903112,
+                new String[]{"name", "img"}, new int[]{R.id.name, R.id.img});
+        listView.setAdapter(adapter);
+        listView.setOnItemClickListener(this);
+        refreshListItems(currentPath);
+    }
+
+    private void refreshListItems(String path) {
+        setTitle(path);
+        File[] files = new File(path).listFiles();
+        list.clear();
+        if (files != null) {
+            for (File file : files) {
+                Map<String, Object> map = new HashMap<>();
+                if (file.isDirectory()) {
+                    map.put("img", R.drawable.directory_net1314080903112);
+                } else {
+                    map.put("img", R.drawable.file_doc_net1314080903112);
+                }
+                map.put("name", file.getName());
+                map.put("currentPath", file.getPath());
+                list.add(map);
+            }
+        }
+        adapter.notifyDataSetChanged();
+    }
+
+    @Override
+    public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
+        currentPath = (String) list.get(position).get("currentPath");
+        File file = new File(currentPath);
+        if (file.isDirectory())
+            refreshListItems(currentPath);
+        else {
+            Intent intent = new Intent();
+            intent.putExtra("apk_path", file.getPath());
+            setResult(RESULT_OK, intent);
+            finish();
+        }
+
+    }
+
+    @Override
+    public void onBackPressed() {
+        if (rootPath.equals(currentPath)) {
+            super.onBackPressed();
+        } else {
+            File file = new File(currentPath);
+            currentPath = file.getParentFile().getPath();
+            refreshListItems(currentPath);
+        }
+    }
+}