如何使Android应用加载速度更快？(how to make the android app lo

我设计了一个应用程序的Android，在我显示的主要活动已启动，但应用程序需要5-7秒开始在低端设备之前启动画面。 我想，以减少时间尽可能低。 我一直在试图减少在做的事情onCreate()但现在我不能去除更多的从任何东西。 我粘贴，我已经习惯了显示启动和MainActivity代码的代码。 请帮我减少了应用程序的启动时间。

Splash.java

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.activity_splash);
    txtLoad = (TextView) findViewById(R.id.txtLoading);
    txtLoad.setText("v1.0");

    new Thread() {
        public void run() {
            try {
                sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                finish();
                Intent intent = new Intent(SplashActivity.this,MainActivity.class);
                startActivity(intent);
            }
        }
    }.start();
}

MainActivity.java

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.activity_main);
    editType1UserName = (EditText) findViewById(R.id.editTextType1UserName);
    editType1Password = (EditText) findViewById(R.id.editTextType1Password);
    editType2UserName = (EditText) findViewById(R.id.editTextType2UserName);
    editType2Password = (EditText) findViewById(R.id.editTextType2Password);
    editType3UserName = (EditText) findViewById(R.id.editTextType3UserName);
    editType3Password = (EditText) findViewById(R.id.editTextType3Password);
    editType4UserName = (EditText) findViewById(R.id.editTextType4UserName);
    editType4Password = (EditText) findViewById(R.id.editTextType4Password);
    mTxtPhoneNo = (AutoCompleteTextView) findViewById(R.id.mmWhoNo);
    mTxtPhoneNo.setThreshold(1);
    editText = (EditText) findViewById(R.id.editTextMessage);
    spinner1 = (Spinner) findViewById(R.id.spinnerGateway);
    btnsend = (Button) findViewById(R.id.btnSend);
    btnContact = (Button) findViewById(R.id.btnContact);
    btnsend.setOnClickListener((OnClickListener) this);
    btnContact.setOnClickListener((OnClickListener) this);
    mPeopleList = new ArrayList<Map<String, String>>();
    PopulatePeopleList();
    mAdapter = new SimpleAdapter(this, mPeopleList, R.layout.custcontview,
            new String[] { "Name", "Phone", "Type" }, new int[] {
                    R.id.ccontName, R.id.ccontNo, R.id.ccontType });
    mTxtPhoneNo.setAdapter(mAdapter);
    mTxtPhoneNo.setOnItemClickListener((OnItemClickListener) this);
    readPerson();
    Panel panel;
    topPanel = panel = (Panel) findViewById(R.id.mytopPanel);
    panel.setOnPanelListener((OnPanelListener) this);
    panel.setInterpolator(new BounceInterpolator(Type.OUT));
    getLoginDetails();

}

Answer 1:

你有放缓的原因是因为你最有可能查询手机上的联系人提供商，从这些查询提取一些数据，把它们放在mPeopleList ，然后将其设置为您SimpleAdapter 。 所以，你的活动的onCreate方法将等待PopulatePeopleList()完成其工作。 我不知道你是怎么查询接触供应商，而是看你是否能不能适应你的代码使用CursorLoader （通过兼容包在较旧的Android版本）。 这将意味着，你将不得不切换到Cursor基于适配器，这取决于你的代码中可能发生转变。

如果你仍然想使用基于非SimpleAdapter你需要重写它他们实现自己的AsyncTaskLoader （在旧的Android版本再次可以通过兼容包）：

public class ContactsDataLoader extends
        AsyncTaskLoader<ArrayList<Map<String, String>>> {

    public ContactsDataLoader(Context context) {
        super(context);     
    }

    @Override
    public ArrayList<Map<String, String>> loadInBackground() {
        // here do what you do in the PopulatePeopleList() method
        // this will be done in another thread so the activity will initially
        // start empty(set an empty mPeoples list to the SimpleAdapter) and as
        // this loader finishes its job you'll have the list filled with the
        // data that is returned here
        return data;
    }

    @Override
    protected void onStartLoading() {
        super.onStartLoading();
        forceLoad();
    }

}

然后，你必须在你需要该数据的活动，实施LoaderManager.LoaderCallbacks<ArrayList<Map<String, String>>> ：

public class MainActivity implements LoaderManager.LoaderCallbacks<ArrayList<Map<String, String>>>

接口需要这种方法来定义：

@Override
    public Loader<ArrayList<Map<String, String>>> onCreateLoader(int id,
            Bundle args) {
        return new ContactsDataLoader(context);
    }

    @Override
    public void onLoadFinished(Loader<ArrayList<Map<String, String>>> loader,
            ArrayList<Map<String, String>> data) {
        // your custom adapter will need a method to update its data
        adapter.changeData(data);
        // you always have the option of using a normal SimpleAdapter and create
        // a new instance each time the data changes
        // mPeopleList = data;
        // mAdapter = new SimpleAdapter(this, mPeopleList,
        // R.layout.custcontview,
        // new String[] { "Name", "Phone", "Type" }, new int[] {
        // R.id.ccontName, R.id.ccontNo, R.id.ccontType });
        // mTxtPhoneNo.setAdapter(mAdapter);
    }

    @Override
    public void onLoaderReset(Loader<ArrayList<Map<String, String>>> loader) {
        // your custom adapter will need a method to update its data
        adapter.changeData(null); // or an empty list of data
        // you always have the option of using a normal SimpleAdapter and create
        // a new instance each time the data changes
        // mPeopleList = new ArrayList<Map<String, String>>;
        // mAdapter = new SimpleAdapter(this, mPeopleList,
        // R.layout.custcontview,
        // new String[] { "Name", "Phone", "Type" }, new int[] {
        // R.id.ccontName, R.id.ccontNo, R.id.ccontType });
        // mTxtPhoneNo.setAdapter(mAdapter);
    }

然后，所有你需要做的就是调用：

// mPeopleList will have to be initialized to an empty list in the `onCreate` method
getLoaderManager().initLoader(0, null, this); 

在您onCreate方法。 该应用程序将启动非常快，但将有直到装载机设法做的工作，并从接触该数据并将其设置为您的适配器是空表开始。

文章来源: how to make the android app load faster?