Android 如何设置 TextView 的文本？

How to set text of TextView ?

提问by Arshad Ali

I am facing a problem of setting the text to TextViewin android my code is :

我面临TextView在 android中设置文本的问题，我的代码是：

public class Main extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button button = (Button) findViewById(R.id.button1);
        final TextView text = (TextView) findViewById(R.id.textView1);
        final EditText input = (EditText) findViewById(R.id.editText1);
        final String string = input.getText();
        button.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                text.setText(string);                   
            }
        });
    }
}

if I write

如果我写

    final Editable string = input.getText();

then it works.....!!!!

然后它起作用了......！！！！

Now I want to send data of EditTextto next Activitylike this :

现在我想像这样发送EditText到 next 的数据Activity：

public class Main extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button button = (Button) findViewById(R.id.button1);
        final TextView text = (TextView) findViewById(R.id.textView1);
        final EditText input = (EditText) findViewById(R.id.editText1);
        final Editable string = input.getText();
        button.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                Intent intent = new Intent(Main.this, Second.class);
                intent.putExtra("thetext", string);
                startActivity(intent);
            }
        });
    }
}

and in Second.javaclass I get StringExtrain this way:

在Second.java课堂上我StringExtra是这样的：

public class Second extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);

        TextView text = (TextView) findViewById(R.id.textView2);
        String string = getIntent().getExtras().getString("thetext", "not found");
        text.setText(string); /// Here the text is not shown but the default message "not found" is set to `TextView`
    }
}

Please give me way to proceed in development.

请给我继续开发的方法。

采纳答案by Brayden

I think the problem is you're actually putting an "Editable" in the intent, not a String. Although close, they're not the same thing. If you toString() your Editable to get a String object and put that in the intent, you should be able to get it back out with getString like you're doing.

我认为问题在于您实际上是在意图中放置了“可编辑”，而不是字符串。虽然很接近，但它们不是一回事。如果你 toString() 你的 Editable 来获取一个 String 对象并将其放入意图中，你应该能够像你正在做的那样使用 getString 将它取回。

回答by skywall

The problem should be, you're sending Editable, not String. Try this:

问题应该是，您发送的是Editable，而不是String。尝试这个：

final String string = input.getText().toString();

回答by Brayden

     private TextView mTextView;
     private String mString;

mTextView = (TextView) findViewById(R.id.tv);
mString = "hello everyone ! how r u?";
mTextView.setText(mString);

回答by Sam

Try something like this:

尝试这样的事情：

public class Main extends Activity {
    EditText input;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        TextView text = (TextView) findViewById(R.id.textView1);
        input = (EditText) findViewById(R.id.editText1);

        Button button = (Button) findViewById(R.id.button1);
        button.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                Intent intent = new Intent(Main.this, Second.class);
                intent.putExtra("thetext", input.getText().toString());
                startActivity(intent);
            }
        });
    }
}

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回答by Drake Clarris

According to the android docs, the name of the string put into extras must include a package prefix... i.e. som.arshay.dev.thetext Secondly, getExtras() returns a bundle, which is not what you added. You need getStringExtra( name )

根据android docs，放入extras 的字符串的名称必须包含包前缀...即som.arshay.dev.thetext 其次，getExtras() 返回一个包，这不是您添加的包。你需要 getStringExtra( name )

回答by Aerrow

In this line use

在这一行中使用

final String string = input.getText().toString(); 

instead of

代替

final String string = input.getText();