Android中activity以dialog的形式出现

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activity变身为dialog可以实现多功能的dialog，闲话少说直接上代码！

MainActivity.class

/** * Activity伪装成的Dialog需要继承Activity * 弹窗Activity需要添加主题Theme */public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void start(View view) {        startActivity(new Intent(MainActivity.this, DialogActivity.class));    }}

activity_mian.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="jpceshi.jiaxiao.com.dialogactivity.MainActivity">    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:onClick="start"        android:text="跳转" /></LinearLayout>

跳转后出现的dialog样式

DialogActivity .class

/**在edittext中输入内容后点击button会将内容直接显示到textView中。*/public class DialogActivity extends Activity {    private EditText mEditText;    private Button mButton;    private TextView mTextView;    private String str;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_dialog);        initView();    }    private void initView() {        mEditText = (EditText) findViewById(R.id.edtext);        mTextView = (TextView) findViewById(R.id.tvshow);        mEditText.addTextChangedListener(new TextWatcher() {            @Override            public void beforeTextChanged(CharSequence s, int start, int count, int after) {            }            @Override            public void onTextChanged(CharSequence s, int start, int before, int count) {            }            @Override            public void afterTextChanged(Editable s) {                str = s.toString();            }        });    }    public void addText(View view) {        if (str != null) {            mTextView.setText(str);        } else {            mTextView.setText("null");        }    }}

activity_dialog.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="200dp"    android:layout_height="200dp"    android:orientation="vertical"    tools:context="jpceshi.jiaxiao.com.dialogactivity.activity.DialogActivity">    <EditText        android:id="@+id/edtext"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:background="@android:drawable/editbox_background"        android:gravity="center"        android:hint="请输入"        android:textColor="@android:color/black"        android:textColorHint="@android:color/holo_blue_light" />    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:background="@android:drawable/button_onoff_indicator_on"        android:onClick="addText"        android:text="添加" />    <TextView        android:id="@+id/tvshow"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:textColor="@android:color/black" /></LinearLayout>

注：
最重要的一步是：在AndroidManifest.xml文件中给需要显示成dialog样式的
Activity添加 android:theme=”@android:style/Theme.Dialog”（系统自带的样式，也可以自定义样式）

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