java - 从 2 个不同的 Activity 启动相同的 Activity 并更新数据

Question

我有三项 Activity 。

在主要 Activity 中我有 3 个按钮。第一个和第二个按钮将我带到其他 Activity 。第三个按钮向我显示我使用 Intent 从其中选择的数据。

但是我无法同时看到第二个和第三个 Activity 的数据。我只看到其中之一。

我认为他们每个人都创建了不同的主要 Activity 。我只需要一个主要 Activity 来汇总第二个和第三个 Activity 的数据。

这是我的主要 Activity 的 java 代码:

@Override protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    button = (Button) findViewById(R.id.button2);
    button1 = (Button) findViewById(R.id.button3);
    button2 = (Button) findViewById(R.id.button4);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);

   textrecievebox.setText(getIntent().getExtras().getString("jockeyno"));

    // Capture button clicks
    button.setOnClickListener(new View.OnClickListener() {
        public void onClick(View arg0) {

            // Start NewActivity.class
            Intent myIntent = new Intent(MainActivity.this,
                    Main2Activity.class);
            startActivity(myIntent);
        }
    });
    button1.setOnClickListener(new View.OnClickListener() {
        public void onClick(View arg0) {

            // Start NewActivity.class
            Intent myIntent1 = new Intent(MainActivity.this,
                    Main3Activity.class);
            startActivity(myIntent1);
        }
    });

    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();

        }
    });
}

public  void showdata(View v)
{


    ImageView show1= (ImageView)findViewById(R.id.imageView3);
    ImageView show2= (ImageView)findViewById(R.id.imageView14);
    ImageView show3= (ImageView)findViewById(R.id.imageView15);
    ImageView show4= (ImageView)findViewById(R.id.imageView16);

    ImageView show5= (ImageView)findViewById(R.id.imageView18);
    ImageView show6= (ImageView)findViewById(R.id.imageView19);
    ImageView show7= (ImageView)findViewById(R.id.imageView20);
    ImageView show8= (ImageView)findViewById(R.id.imageView21);

    TextView textrecievebox= (TextView)findViewById(R.id.textView2);
    textrecievebox.setText(getIntent().getExtras().getString("jockeyno"));
    Bundle bundle=this.getIntent().getExtras();
    int pic=bundle.getInt("image");
   show1.setImageResource(pic);

    Bundle bundle1=this.getIntent().getExtras();
    int pic1=bundle1.getInt("image1");
    show2.setImageResource(pic1);

    Bundle bundle2=this.getIntent().getExtras();
    int pic2=bundle2.getInt("image2");
    show3.setImageResource(pic2);

    Bundle bundle3=this.getIntent().getExtras();
    int pic3=bundle3.getInt("image3");
    show4.setImageResource(pic3);

    Bundle bundle4=this.getIntent().getExtras();
    int pic4=bundle4.getInt("image4");
    show5.setImageResource(pic4);

    Bundle bundle5=this.getIntent().getExtras();
    int pic5=bundle5.getInt("image5");
    show6.setImageResource(pic5);

    Bundle bundle6=this.getIntent().getExtras();
    int pic6=bundle6.getInt("image6");
    show7.setImageResource(pic6);

    Bundle bundle7=this.getIntent().getExtras();
    int pic7=bundle7.getInt("image7");
    show8.setImageResource(pic7);
}

第二个 Activity

@Override protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    jockey = (EditText)findViewById(R.id.editText2);
    Controlpanel = (EditText)findViewById(R.id.editText4);
    Detector = (EditText)findViewById(R.id.editText);
    Extinghuer = (EditText)findViewById(R.id.editText3);

    Pumpspinner=(Spinner)findViewById(R.id.Pumpspinner);
    Pumpspinner1=(Spinner)findViewById(R.id.spinner);
    Pumpspinner2=(Spinner)findViewById(R.id.spinner2);
    Pumpspinner3=(Spinner)findViewById(R.id.spinner3);

    Pump=(ImageView)findViewById(R.id.imageView);

    ArrayAdapter adapter =ArrayAdapter.createFromResource(this,R.array.Pumps,android.R.layout.simple_spinner_item);
    Pumpspinner.setAdapter(adapter);
    Pumpspinner.setOnItemSelectedListener(this);

    ArrayAdapter adapter1 =ArrayAdapter.createFromResource(this,R.array.controlpanel,android.R.layout.simple_spinner_item);
    Pumpspinner1.setAdapter(adapter1);
    Pumpspinner1.setOnItemSelectedListener(this);

    ArrayAdapter adapter2 =ArrayAdapter.createFromResource(this,R.array.firedetector,android.R.layout.simple_spinner_item);
    Pumpspinner2.setAdapter(adapter2);
    Pumpspinner2.setOnItemSelectedListener(this);

    ArrayAdapter adapter3 =ArrayAdapter.createFromResource(this,R.array.fireextighuer,android.R.layout.simple_spinner_item);
    Pumpspinner3.setAdapter(adapter3);
    Pumpspinner3.setOnItemSelectedListener(this);


    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();
        }
    });
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}


}

public void onButtonClickSaveData (View v)
{
    Intent mysendIntent = new Intent(Main2Activity.this, MainActivity.class);
    mysendIntent.putExtra("jockeyno", jockey.getText().toString());

    Bundle bundle=new Bundle();
    Bundle bundle1=new Bundle();
    Bundle bundle2=new Bundle();
    Bundle bundle3=new Bundle();
    bundle.putInt("image", R.drawable.jockpypump);
    bundle1.putInt("image1", R.drawable.controlpanel1);
    bundle2.putInt("image2", R.drawable.detector);
    bundle3.putInt("image3", R.drawable.extinguisher1);

    mysendIntent.putExtras(bundle);
    mysendIntent.putExtras(bundle1);
    mysendIntent.putExtras(bundle2);
    mysendIntent.putExtras(bundle3);

    startActivityForResult(mysendIntent,1);
}

第三个 Activity 与第二个 Activity 相同，但图像和文本不同。

Answer 1

你正在做的是这样的:

• 从Main开始，启动Main2，启动Main的新实例——仅包含来自的数据>Main2
• 从Main开始，启动Main3，启动main的新实例——仅包含来自的数据>Main3

你应该做的是这个

• 从 Main 开始，使用 startActivityForResult() 启动 Main2，在 Main2 中执行操作，结束 Main2 使用 setResult() 和 finish()，将数据存储在 Main 中，对 Main3 重复

使用setResult()，您可以将数据从Main2传递回Main，Main3也是如此.