Merge pull request #197 from zhenglide/master

#1 #23 lab--创建工程

app/src/main/java/edu/hzuapps/androidworks/homeworks/com1314080901145/MainActivity.java

@@ -0,0 +1,94 @@
+package com.example.zhenglide.exam;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.design.widget.FloatingActionButton;
+import android.support.design.widget.Snackbar;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.view.View;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.widget.Button;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class MainActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+     String DB_PATH="/data/data/com.example.zhenglide.exam/dataabase/";
+        String DB_NAME="question.db";
+        if(new File(DB_PATH+DB_NAME).exists()==false)
+
+        {File dir=new File(DB_PATH);
+            if (!dir.exists()){
+                dir.mkdir();
+            }
+            try {
+                InputStream is=getBaseContext().getAssets().open(DB_NAME);
+                OutputStream os=new FileOutputStream(DB_PATH+DB_NAME);
+                byte[] buffer=new  byte[1024];
+                int length;
+                while((length=is.read(buffer))>0)
+                {
+                    os.write(buffer,0,length);
+                }
+                os.flush();
+                is.close();
+                os.close();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+
+        }
+        Button btn=(Button)findViewById(R.id.button);
+        btn.setOnClickListener(new View.OnClickListener()
+        {
+            @Override
+            public void onClick(View v) {
+                Intent intent=new Intent(MainActivity.this,ExamActivity.class);
+                startActivity(intent);
+            }
+        });
+        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+
+        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
+        fab.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
+                        .setAction("Action", null).show();
+            }
+        });
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        // Inflate the menu; this adds items to the action bar if it is present.
+        getMenuInflater().inflate(R.menu.menu_main, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        // Handle action bar item clicks here. The action bar will
+        // automatically handle clicks on the Home/Up button, so long
+        // as you specify a parent activity in AndroidManifest.xml.
+        int id = item.getItemId();
+
+        //noinspection SimplifiableIfStatement
+        if (id == R.id.action_settings) {
+            return true;
+        }
+
+        return super.onOptionsItemSelected(item);
+    }
+}