Question

我是android新手，我正在从developer.android做教程。我正在做“开始另一个活动”部分。但我的应用程序无法正常工作，我得到“遗憾的是应用已停止工作”。这是代码：

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //Proveravamo da li je verzija Androida Honeycomb ili veca da bi koristili ActionBar APIje
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB){
        //Prikazi UP dugme u ActionBar
        getActionBar().setDisplayHomeAsUpEnabled(true);
    }

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }

    Intent intent = getIntent(); //Uzimamo intent koji je poslala MainActivity
    String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE); //Uzimamo EXTRA_MESSAGE iz intenta koji smo prihvatili

    //dodajemo textView
    TextView textView = new TextView(this);
    textView.setTextSize(40);
    textView.setText(message);

    setContentView(textView);
}

Answer 1

试试这个;

Intent myIntent = new Intent(CurrentActivity.this, NextActivity.class);
myIntent.putExtra("key", value); //Optional parameters
CurrentActivity.this.startActivity(myIntent);

通过以下方式检索额外内容：[代码编辑]

@Override
protected void onCreate(Bundle savedInstanceState) {
Intent intent = getIntent();
String value = intent.getStringExtra("key"); //if it's a string you stored.

[已添加]不要忘记在AndroidManifest.xml：

中添加新活动

Answer 2

我发现了什么问题。这是代码的这一部分：

if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB){
    //Prikazi UP dugme u ActionBar
    getActionBar().setDisplayHomeAsUpEnabled(true);
}

if (savedInstanceState == null) {
    getSupportFragmentManager().beginTransaction()
            .add(R.id.container, new PlaceholderFragment()).commit();
}

Answer 3

首先是秋天，我可以从你的代码中看到

you are trying to inflate TextView directly in setContentView() which is wrong , 
You have to inflate the complete layout file that represents your Activity layout like;

setContentView(R.layout.yourXML_filename);

其次，

You need to define setContentView() at the first in onCreate() not at the end, 
what i can see in this code.

像。

protected void onCreate(Bundle savedInstanceState) 
{
  super.onCreate(savedInstanceState);
  setContentView(R.layout.yourXML_filename); 

  .......Do your stuff what you are doing and wanna do
  .......

 }

请告诉我这是否可以解决您的问题......

具有intent和textView的android新活动

3 个答案: