android - 如何将额外的 Intent 传递给两个 Activity

Question

我有一个应用程序，在第一个 Activity 中询问第二页上的人名，它在句子中显示姓名我想在第三个第四个或第九个 Activity 中使用我如何正确声明它(公开？)并在我需要的时间和地点调用它？这是我发送的代码

主要

public class MainActivity extends Activity {
Button ok;
EditText name;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    name=(EditText)findViewById(R.id.editText);
    Typeface font_a = Typeface.createFromAsset(getAssets(),"fonts/MarkerFelt.ttf");
    name.setTypeface(font_a);
    ok=(Button)findViewById(R.id.button);
       Typefacefont_b=Typeface.createFromAsset(getAssets(),
"fonts/SignPaintersGothicShaded.ttf");
    ok.setTypeface(font_b);

    ok.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {
            String nameStr = name.getText().toString();

            Intent intent = new Intent(getApplicationContext(), SecondActivity.class);
            intent.putExtra("NAMEDATA",nameStr);
            startActivity(intent);

        }
    });

}

这是接收它的 Activity 2

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);
    t = (TextView)findViewById(R.id.textView3);
    Typeface font_b = Typeface.createFromAsset(getAssets(),"fonts/MarkerFelt.ttf");
    t.setTypeface(font_b);
    String n = this.getIntent().getStringExtra("NAMEDATA");
    t.setText(n);

请问我该如何重用它？

Answer 1

使用 SharedPreferences 保存名称或您需要的任何变量，然后在需要时读取。首先，在 MainActivity 中创建 global，它将用作首选项文件名:

public static final String PREFS_NAME = "MyPrefsFile";

然后，保存:

SharedPreferences settings = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.putString("name", name);
editor.commit();

加载:

SharedPreferences settings = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
String name = settings.getString("name", "John");

保存后，每个 Activity 都可以访问首选项。

因此，在您的情况下，按下确定按钮时保存名称:

ok.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View arg0) {
        String nameStr = name.getText().toString();

        SharedPreferences settings = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = settings.edit();
        editor.putString("name", nameStr);
        editor.commit();

        Intent intent = new Intent(getApplicationContext(), SecondActivity.class);
        startActivity(intent);

    }
});

然后阅读:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);

    t = (TextView)findViewById(R.id.textView3);
    Typeface font_b = Typeface.createFromAsset(getAssets(),"fonts/MarkerFelt.ttf");
    t.setTypeface(font_b);

    SharedPreferences settings = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
    String n = settings.getString("name", "defaultName");
    t.setText(n);

您可以在每项需要的 Activity 中进行类似的操作。请参阅文档 here .